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| Delaware                        | 20-5639997                                                                                                                                                                                         |
|---------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| (State or Other Jurisdiction of | (I.R.S. Employer Identification No.)                                                                                                                                                               |
| Incorporation or Organization)  |                                                                                                                                                                                               |
|                            |                                                                                                                                                                                               |
|                            | 1100 Louisiana Street, 10th Floor, Houston, Texas              77002                                                         |   |
|                            |                (Address of Principal Executive Offices)         (Zip Code) |   |
|                            |                                                                                                                                                                                               |   |
|                            | (713) 381-6500                                                                                                                                                                                     |   |
|                            | (Registrant's Telephone Number, Including Area Code)                                                                                                                                               |   |

| Title of Each Class | Name of Each Exchange On Which Registered |
|---------------------|-------------------------------------------|
| Common Units        | New York Stock Exchange                   |

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| Large accelerated filer o                                                              |                    Accelerated filer þ |
|----------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------|
| Non-accelerated filer   o (Do not check if a smaller reporting company) | Smaller reporting companyo                                                                                                                 |

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DUNCAN ENERGY 

|          |                                                                             | Page   |
|---------------|----------------------------------------------------------------------------------|--------|
|          |                                                                             | Number |
| PART I        |
| Item 1 and 2. | Business and Properties.                                                         | 5      |
| Item 1A.      | Risk Factors.                                                                    | 27     |
| Item 1B.      | Unresolved Staff Comments.                                                       | 51     |
| Item 3.       | Legal Proceedings.                                                               | 51     |
| Item 4.       | (Removed and Reserved).                                                          | 51     |
|          |                                                                             |   |
| PART II       |
| Item 5.       | Market for Registrant’s Common Equity, Related Unitholder                  | 52     |
|          |      Matters and Issuer Purchases of Equity Securities. |   |
| Item 6.       | Selected Financial Data.                                                         | 53     |
| Item 7.       | Management’s Discussion and Analysis of Financial Condition and            | 54     |
|          |      Results of Operations.                             |   |
| Item 7A.      | Quantitative and Qualitative Disclosures about Market Risk.                      | 79     |
| Item 8.       | Financial Statements and Supplementary Data.                                     | 80     |
| Item 9.       | Changes in and Disagreements with Accountants on Accounting and                  | 80     |
|          |      Financial Disclosure.                              |   |
| Item 9A.      | Controls and Procedures.                                                         | 80     |
| Item 9B.      | Other Information.                                                               | 83     |
|          |                                                                             |   |
| PART III      |
| Item 10.      | Directors, Executive Officers and Corporate Governance.                          | 83     |
| Item 11.      | Executive Compensation.                                                          | 89     |
| Item 12.      | Security Ownership of Certain Beneficial Owners and Management                   | 98     |
|          |      and Related Unitholder Matters.                    |   |
| Item 13.      | Certain Relationships and Related Transactions, and Director Independence.       | 101    |
| Item 14.      | Principal Accountant Fees and Services.                                          | 105    |
|          |                                                                             |   |
| PART IV       |
| Item 15.      | Exhibits and Financial Statement Schedules.                                      | 106    |
|          |                                                                             |   |
| Signatures    | 111                                                                              |
|          |                                                                             |

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PART I

Item 1 and 2.  Business and Properties.

| §   | Mont Belvieu Caverns owns 34 underground salt dome storage caverns located in Mont Belvieu, Texas, having an NGL and related product storage capacity of approximately 100 million barrels (“MMBbls”), and a brine system with approximately 20 MMBbls of above ground storage capacity and related brine production wells. |
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| §   | Acadian Gas is engaged in the gathering, transportation, storage and marketing of natural gas in south Louisiana, utilizing over 1,000 miles of pipelines having an aggregate throughput capacity of approximately 1.1 billion cubic feet per day (“Bcf/d”).  Acadian Gas also owns a 49.51% equity interest in Evangeline, which owns a 27-mile natural gas pipeline located in southeast Louisiana. |
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| §   | Lou-Tex Propylene owns a 267-mile pipeline used to transport chemical-grade propylene from Sorrento, Louisiana to Mont Belvieu, Texas. |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------|

| §   | Sabine Propylene owns a 21-mile pipeline used to transport polymer-grade propylene from Port Arthur, Texas to a pipeline interconnect in Cameron Parish, Louisiana. |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | South Texas NGL owns a 297-mile pipeline system used to transport NGLs from our Shoup and Armstrong NGL fractionation facilities in South Texas to Mont Belvieu, Texas. |
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| §   | Enterprise GC operates and owns: (i) two NGL fractionation facilities, the Shoup and Armstrong facilities, located in South Texas; (ii) a 1,185-mile NGL pipeline system located in South Texas; and (iii) 1,096 miles of natural gas gathering pipelines located in South and West Texas.  Enterprise GC’s natural gas gathering pipelines include: (i) the 262-mile Big Thicket Gathering System located in southeast Texas; (ii) the 660-mile Waha system located in the Permian Basin of West Texas; and (iii) the 174-mile TPC Offshore gathering system located in South Texas. |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Enterprise Intrastate operates and owns an undivided 50% interest in the assets comprising the 641-mile Channel natural gas pipeline, which extends from the Agua Dulce Hub in South Texas to Sabine, Texas located on the Texas/Louisiana border. |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Enterprise Texas owns the 6,653-mile Enterprise Texas natural gas pipeline system, which includes the Sherman Extension and Trinity River Lateral pipelines, and leases the Wilson natural gas storage facility.  The Enterprise Texas pipeline system and the Wilson storage facility, along with the Waha, TPC Offshore and Channel pipeline systems, comprise our Texas Intrastate System. |
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| §   | optimize the benefits of our economies of scale, strategic location and pipeline connections serving natural gas, NGL, petrochemical and refining customers; |
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| §   | manage our portfolio of midstream energy assets to minimize volatility in our cash flows; |
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| §   | invest in organic growth capital projects to capitalize on market opportunities that expand our asset base and generate additional cash flow; and |
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| §   | pursue acquisitions of assets and businesses from related parties or, in accordance with our business opportunity agreements, from third parties. |
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| §   | Natural Gas Pipelines & Services; |
|--------------------|---------------------------------------|

| §   | NGL Pipelines & Services; and |
|--------------------|-----------------------------------|

| §   | Petrochemical Services. |
|--------------------|-------------------------|

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| /d     |   = per day                        |
|--------|-----------------------------------------|
| TBtus  |   = trillion British thermal units |
| BBtus  |   = billion British thermal units  |
| Bcf    |   = billion cubic feet             |
| MBPD   |   = thousand barrels per day       |
| MBbls  |   = thousand barrels               |
| MMBbls |   = million barrels                |
| MMBtus |   = million British thermal units  |
| MMcf   |   = million cubic feet             |

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|                                                                                                                                                                                                                                                                                                                                                                                                         |      |          | Approx. Net       |     |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------|---------------|-------------------|----------|
|                                                                                                                                                                                                                                                                                                                                                                                                         |      |          | Capacity,         | Working  |
|                                                                                                                                                                                                                                                                                                                                                                                                         |      |  Length  |  Natural Gas | Capacity |
| Description of Asset                                                                                                                                                                                                                                                                                                                                                                                         | Location  |  (Miles) |  (MMcf/d)    | (Bcf)    |
| Natural gas pipelines:                                                                                                                                                                                                                                                                                                                                                                                       |      |          |              |     |
| Texas Intrastate System                                                                                                                                                                                                                                                                                                                                                                                      | Texas     | 8,128         | 6,640             |     |
| Acadian Gas System                                                                                                                                                                                                                                                                                                                                                                                           | Louisiana | 1,041         | 1,149             |     |
| Big Thicket Gathering System (1)                                                                                                                                                                                                                                                                                                                                                                             | Texas     | 262           | 60                |     |
| Total miles                                                                                                                                                                                                                                                                                                                                                                                                  |      | 9,431         |              |     |
| Natural gas storage facilities:                                                                                                                                                                                                                                                                                                                                                                              |      |          |              |     |
| Wilson  (2)                                                                                                                                                                                                                                                                                                                                                                                        | Texas     |          |              | 6.8      |
| Acadian (3)                                                                                                                                                                                                                                                                                                                                                                                                  | Louisiana |          |              | 1.3      |
| Total gross capacity                                                                                                                                                                                                                                                                                                                                                                                         |      |          |              | 8.1      |
|                                                                                                                                                                                                                                                                                                                                                                                                         |      |          |              |     |   |
| (1)   The Big Thicket Gathering System is an integral part of our NGL marketing activities, the results of operations of which are accounted for under our NGL Pipelines & Services business segment.(2)   This facility is held under an operating lease that expires in January 2028.(3)   This facility is held under an operating lease that expires in December 2012. |

| §   | The Texas Intrastate System gathers and transports natural gas from supply basins in Texas (from both onshore and offshore sources) to local gas distribution companies and electric generation and industrial and municipal consumers as well as to connections with intrastate and interstate pipelines.  The Texas Intrastate System is comprised of the 6,653-mile Enterprise Texas pipeline system, the 641-mile Channel pipeline system, the 660-mile Waha gathering system and the 174-mile TPC Offshore gathering system.  The Enterprise Texas pipeline system includes a 265-mile pipeline we lease from an affiliate of ETP.  The leased Wilson natural gas storage facility, located in Wharton County, Texas, is an integral part of the Texas Intrastate System.  Collectively, the Texas Intrastate System serves important natural gas producing regions and commercial markets in Texas, including Corpus Christi, the San Antonio/Austin area, the Beaumont/Orange area and the Houston area, including the Houston Ship Channel industrial market.  Our Texas Intrastate System is strategically located to benefit from increasing natural gas production from the Eagle Ford Shale basin located in South Texas. |
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|    | Construction projects for the Texas Intrastate System in the Eagle Ford Shale supply basin include an expansion of its rich natural gas mainline that will add three additional pipeline segments totaling 168 miles.  Upon completion in mid-2012, this rich gas mainline system and associated laterals will consist of approximately 300 miles of pipelines representing gathering and transportation capacity of more than 600 MMcf/d.  The east end of the Eagle Ford mainline will terminate at a new cryogenic natural gas processing facility to be constructed and owned by EPO.  Takeaway capacity for residue gas from the new processing facility will be provided by a combination of our existing pipeline infrastructure and construction of additional natural gas pipelines, including a new 64-mile, 36-inch diameter pipeline that will terminate at our Wilson natural gas storage facility.  We are also constructing a new storage cavern adjacent to the leased Wilson natural gas storage facility that is expected to be completed in the second quarter of 2011.  When completed, this new cavern is expected to provide us with an additional 5.0 Bcf of usable natural gas storage capacity.  EPO is funding all of the capital expenditures associated with these expansion capital projects.  The aggregate estimated cost of these expansion projects is approximately $1.15 billion.As a result of the DEP II drop down transaction, we own a 51% equity interest in the entities that own the Enterprise Texas and Channel pipeline systems and lease the Wilson storage facility.  In addition, we own a 66% equity interest in the entity that owns the Waha and TPC Offshore gathering systems.  EPO owns the remaining equity interests in these entities. |
|--------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | The Acadian Gas System purchases, transports, stores and resells natural gas in Louisiana.  The Acadian Gas System is comprised of the 576-mile Cypress pipeline, the 438-mile Acadian pipeline and the 27-mile Evangeline pipeline.  The Acadian Gas System includes a leased natural gas storage facility at Napoleonville, Louisiana that is an integral part of its pipeline operations.  The Acadian Gas pipeline system links natural gas supplies from onshore Gulf Coast and offshore Gulf of Mexico developments with local gas distribution companies, electric generation plants and industrial customers, located primarily in the natural gas market area of the Baton Rouge – New Orleans – Mississippi River corridor. |
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|                                                                                                                                                                                                                                                                                                                                             |     |          | Usable   | Total    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------|---------------|----------|----------|
|                                                                                                                                                                                                                                                                                                                                             |     |          | Storage  | Plant    |
|                                                                                                                                                                                                                                                                                                                                             |     |  Length  | Capacity | Capacity |
| Description of Asset                                                                                                                                                                                                                                                                                                                             | Location |  (Miles) | (MMBbls) | (MBPD)   |
| NGL pipelines:                                                                                                                                                                                                                                                                                                                                   |     |          |     |     |
| South Texas NGL System - Pipelines                                                                                                                                                                                                                                                                                                               | Texas    | 1,482         |     |     |
| NGL, petrochemical and refined products storage facilities:                                                                                                                                                                                                                                                                                      |     |          |     |     |
| Mont Belvieu Storage (34 caverns) (1)                                                                                                                                                                                                                                                                                                            | Texas    |          | 100.0    |     |
| Almeda (5 caverns) (1, 2)                                                                                                                                                                                                                                                                                                                        | Texas    |          | 13.0     |     |
| Markham (2 caverns) (1, 2)                                                                                                                                                                                                                                                                                                                       | Texas    |          | 4.3      |     |
| Total usable capacity                                                                                                                                                                                                                                                                                                                            |     |          | 117.3    |     |
| NGL fractionation facilities:                                                                                                                                                                                                                                                                                                                    |     |          |     |     |
| South Texas NGL System - Shoup fractionator                                                                                                                                                                                                                                                                                                      | Texas    |          |     | 77       |
| South Texas NGL System - Armstrong fractionator                                                                                                                                                                                                                                                                                                  | Texas    |          |     | 20       |
| Total plant capacities                                                                                                                                                                                                                                                                                                                           |     |          |     | 97       |
|                                                                                                                                                                                                                                                                                                                                             |     |          |     |     |
| (1)   The Mont Belvieu storage complex includes above-ground brine pit capacity of 20 MMBbls.  Brine capacity at the Almeda and Markham facilities is limited to the quantity necessary to support the product storage operations.(2)   Our interest in these facilities is held under long-term operating leases. |

| §   | The Mont Belvieu Storage complex consists of three interconnected underground storage facilities:  East Storage, West Storage and North Storage.  The East Storage facility is the largest of our three Mont Belvieu storage facilities.  This facility consists of 14 underground salt dome storage caverns with a storage capacity of approximately 56 MMBbls and an above-ground brine pit with a brine capacity of approximately 10 MMBbls.  This facility also has two brine production wells.  The West Storage facility consists of 10 underground salt dome storage caverns with a storage capacity of approximately 15 MMBbls and an above-ground brine pit with a brine capacity of approximately 2 MMBbls.  See “Significant Recent Developments” within this Item 1 and 2 for information regarding a fire that occurred at the West Storage facility in February 2011.  The North Storage facility consists of 10 underground salt dome storage caverns with a storage capacity of approximately 30 MMBbls and an above-ground brine pit with a brine capacity of approximately 8 MMBbls. |
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| §   | The South Texas NGL System consists of our South Texas NGL pipelines and fractionators and includes the leased Markham and Almeda NGL storage facilities. |
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| §   | The Lou-Tex Propylene Pipeline is a 267-mile pipeline used to transport chemical-grade propylene from Sorrento, Louisiana to Mont Belvieu, Texas.  Shell Oil Company (“Shell”) and Exxon Mobil are the only customers of this pipeline.  The chemical-grade propylene we transport for Shell originates at its underground storage facility located in Sorrento, Louisiana and is delivered to various receipt points between Sorrento, Louisiana and Mont Belvieu, Texas.  The chemical-grade propylene we transport for Exxon Mobil originates from its refining and chemical complex located in Baton Rouge, Louisiana and is delivered to either Exxon Mobil’s customers or to an underground storage well located in Mont Belvieu, Texas owned by Mont Belvieu Caverns. |
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| §   | The Sabine Propylene Pipeline consists of a 21-mile pipeline used to transport polymer-grade propylene from Port Arthur, Texas to a pipeline interconnect in Cameron Parish, Louisiana.  Shell is the sole customer of this pipeline.  The polymer-grade propylene transported for Shell originates from the TOTAL/BASF Port Arthur cracker facility and is delivered to the Lyondell Basell polypropylene facility in Lake Charles, Louisiana. |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | As a result of the DEP I drop down transaction, we own a 66% equity interest in Lou-Tex Propylene and Sabine Propylene.  EPO owns the remaining equity interests in these entities. |
|--------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Shell Exchange Agreements.  Shell is obligated to meet minimum delivery requirements under the Lou-Tex Propylene and Sabine Propylene agreements.  If Shell fails to meet such minimum delivery requirements, it is obligated to pay a deficiency fee to us.  The term of the Lou-Tex Propylene exchange agreement expires in March 2020 and the term of the Sabine Propylene exchange agreement expires in November 2011.  The Lou-Tex exchange agreement will continue on a year-to-year basis after expiration, subject to termination by either party.  The fees paid by Shell under the Lou-Tex Propylene exchange agreement are generally fixed and are adjusted annually based on the operating costs of the pipeline and the U.S. Department of Labor wage index.  During 2009, Shell provided notice of its intent to terminate the Sabine Propylene exchange agreement in November 2011.  Given the importance of the Sabine Propylene Pipeline in delivering feedstocks to facilities connected to this pipeline, we believe that the Sabine Propylene Pipeline will remain commercially viable after the Shell exchange agreement expires in 2011. |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Exxon Mobil Exchange Agreement.  The term of the Lou-Tex Propylene Pipeline exchange agreement expired in June 2008, but continues on a monthly basis subject to a two-year termination notice initiated by either party.  The exchange fees paid by Exxon Mobil are based on the volume of chemical-grade propylene delivered. |
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Item 1A.

| §   | the level of domestic production and consumer product demand; |
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| §   | the availability of imported natural gas and actions taken by foreign oil and natural gas providing nations; |
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| §   | the availability of transportation systems with adequate capacity; |
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| §   | the availability of competitive fuels; |
|--------------------|----------------------------------------|

| §   | fluctuating and seasonal demand for natural gas and NGLs; |
|--------------------|-----------------------------------------------------------|

| §   | the impact of conservation efforts; |
|--------------------|-------------------------------------|

| §   | the extent of governmental regulation and taxation of production; and |
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| §   | the overall economic environment. |
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| §   | the level of successful drilling activity near our pipelines; |
|--------------------|---------------------------------------------------------------|

| §   | our ability to compete for these supplies; |
|--------------------|--------------------------------------------|

| §   | our ability to connect our pipelines to the suppliers; |
|--------------------|--------------------------------------------------------|

| §   | the successful completion of new liquefied natural gas (“LNG”) facilities near our pipelines; and |
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| §   | our gas quality requirements. |
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| §   | our ability to obtain additional financing, if necessary, for working capital, capital expenditures, acquisitions or other purposes may be impaired or such financing may not be available on favorable terms; |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | covenants contained in our existing and future credit and debt arrangements require us to meet certain financial tests that may affect our flexibility in planning for and reacting to changes in our business, including possible acquisition opportunities; |
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| §   | we may need a substantial portion of our cash flow to make principal and interest payments on our indebtedness, reducing the funds that would otherwise be available for operation, future business opportunities and distributions to unitholders; and |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | our debt level may make us more vulnerable than our competitors with less debt to competitive pressures or a downturn in our business or the economy generally. |
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| §   | make distributions if any default or event of default occurs; |
|--------------------|---------------------------------------------------------------|

| §   | incur additional indebtedness or guarantee other indebtedness; |
|--------------------|----------------------------------------------------------------|

| §   | grant liens or make certain negative pledges; |
|--------------------|-----------------------------------------------|

| §   | make certain loans or investments; |
|--------------------|------------------------------------|

| §   | make any material change to the nature of our business, including consolidations, liquidations and dissolutions; or |
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| §   | enter into a merger, consolidation, sale and leaseback transaction or sale of assets. |
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| §   | failure to pay any principal, interest, fees, expenses or other amounts when due; |
|--------------------|-----------------------------------------------------------------------------------|

| §   | failure of any representation or warranty made by us in our credit agreements to be true and correct in any material respect; |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------|

| §   | failure to perform or otherwise comply with the covenants in the credit agreements; |
|--------------------|-------------------------------------------------------------------------------------|

| §   | failure to pay any other material debt; |
|--------------------|-----------------------------------------|

| §   | a bankruptcy or insolvency event involving us, our general partner or any of our subsidiaries; |
|--------------------|------------------------------------------------------------------------------------------------|

| §   | the entry of, and failure to pay, one or more adverse judgments in excess of a specified amount against which enforcement proceedings are brought or that are not stayed pending appeal; |
|--------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | a change in control of us; |
|--------------------|----------------------------|

| §   | a judgment default or a default under any material agreement if such default could have a material adverse effect on us; and |
|--------------------|------------------------------------------------------------------------------------------------------------------------------|

| §   | the occurrence of certain events with respect to employee benefit plans subject to the Employee Retirement Income Security Act. |
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| §   | difficulties in the assimilation of the operations, technologies, services and products of the acquired companies or business segments; |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------|

| §   | establishing the internal controls and procedures that we are required to maintain under the Sarbanes-Oxley Act of 2002; |
|--------------------|--------------------------------------------------------------------------------------------------------------------------|

| §   | managing relationships with new joint venture partners with whom we have not previously partnered; |
|--------------------|----------------------------------------------------------------------------------------------------|

| §   | experiencing unforeseen operational interruptions or the loss of key employees, customers, or suppliers; |
|--------------------|----------------------------------------------------------------------------------------------------------|

| §   | inefficiencies and complexities that can arise because of unfamiliarity with new assets and the businesses associated with them, including with their markets; and |
|--------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | diversion of the attention of management and other personnel from day-to-day business to the development or acquisition of new businesses and other business opportunities. |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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| §   | we may be unable to complete construction projects on schedule or at the budgeted cost due to the unavailability of required construction personnel or materials, accidents, weather conditions or an inability to obtain necessary permits; |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | we will not receive any material increases in revenues until the project is completed, even though we may have expended considerable funds during the construction phase, which may be prolonged; |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | we may construct facilities to capture anticipated future growth in production or demand in a region in which such growth does not materialize; |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | since we are not engaged in the exploration for and development of natural gas reserves, we may not have access to third-party estimates of reserves in an area prior to our constructing facilities in the area.  As a result, we may construct facilities in an area where the reserves are materially lower than we anticipate; |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | where we do rely on third-party estimates of reserves in making a decision to construct facilities, these estimates may prove to be inaccurate because there are numerous uncertainties inherent in estimating reserves; and |
|--------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | we may be unable to obtain rights-of-way to construct additional pipelines or the cost to do so may be uneconomical. |
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| §   | Enterprise, EPCO and their affiliates may engage in substantial competition with us on the terms set forth in the ASA. |
|--------------------|------------------------------------------------------------------------------------------------------------------------|

| §   | Neither our partnership agreement nor any other agreement requires EPCO or Enterprise or their affiliates (other than our general partner) to pursue a business strategy that favors us.  Directors and officers of EPCO and the general partners of Enterprise and their affiliates have a fiduciary duty to make decisions in the best interest of their shareholders or unitholders, which may be contrary to our interests. |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Our general partner is allowed to take into account the interests of parties other than us, such as EPCO and Enterprise and their affiliates, in resolving conflicts of interest, which has the effect of limiting its fiduciary duty to our unitholders. |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Some of the employees of EPCO who provide services to us also may devote significant time to the business of Enterprise and will be compensated by EPCO for such services. |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Our partnership agreement limits the liability and reduces the fiduciary duties of our general partner, while also restricting the remedies available to our unitholders for actions that, without these limitations, might constitute breaches of fiduciary duty.  By purchasing common units, |
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|    | unitholders will be deemed to have consented to some actions and conflicts of interest that might otherwise constitute a breach of fiduciary or other duties under applicable law. |
|--------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Our general partner determines the amount and timing of asset purchases and sales, operating expenditures, capital expenditures, borrowings, repayments of indebtedness, issuances of additional partnership securities and cash reserves, each of which can affect the amount of cash that is available for distribution to our unitholders. |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Our general partner determines which costs, including allocated overhead, incurred by it and its affiliates are reimbursable by us. |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------|

| §   | EPO may propose to contribute additional assets to us and, in making such proposal, the directors of EPO have a fiduciary duty to EPO’s members and not to our unitholders. |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Our partnership agreement does not restrict our general partner from causing us to pay it or its affiliates for any services rendered on terms that are fair and reasonable to us or entering into additional contractual arrangements with any of these entities on our behalf. |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Our general partner intends to limit its liability regarding our contractual obligations. |
|--------------------|-------------------------------------------------------------------------------------------|

| §   | Our general partner may exercise its rights to call and purchase all of our common units if, at any time, it and its affiliates own 80% or more of the outstanding common units. |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Our general partner controls the enforcement of obligations owed to us by it and its affiliates, including the ASA. |
|--------------------|---------------------------------------------------------------------------------------------------------------------|

| §   | Our general partner decides whether to retain separate counsel, accountants or others to perform services for us. |
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| §   | the average of the daily closing prices of the common units over the 20 trading days preceding the date three days before notice of exercise of the call right is first mailed; and |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | the highest price paid by our general partner or any of its affiliates for common units during the 90-day period preceding the date such notice is first mailed. |
|--------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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| §   | permits our general partner to make a number of decisions in its individual capacity, as opposed to in its capacity as our general partner.  This entitles our general partner to consider only the interests and factors that it desires, and it has no duty or obligation to give any consideration to any interest of, or factors affecting, us, our affiliates or any limited partner.  Examples include the exercise of its limited call right, its rights to vote or transfer our common units it owns, its registration rights and the determination of whether to consent to any merger or consolidation of the partnership, or amendment to the partnership agreement; |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | provides in the absence of bad faith by the ACG Committee or our general partner, the resolution, action or terms made, taken or provided in connection with a potential conflict of interest transaction will be conclusive and binding on all persons (including all partners) and will not constitute a breach of the partnership agreement or any standard of care or duty imposed by law; |
|--------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | provides the general partner shall not be liable to the partnership or any partner for its good faith reliance on the provisions of the partnership agreement to the extent it has duties, including fiduciary duties, and liabilities at law or in equity; |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | generally provides that affiliate transactions and resolutions of conflicts of interest not approved by the ACG Committee of the board of directors of our general partner must be on terms no less favorable to us than those generally provided to or available from unrelated third parties or be “fair and reasonable” to us; |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | provides that it shall be presumed that the resolution of any conflicts of interest by our general partner or the ACG Committee was not made in bad faith, and in any proceeding brought by or on behalf of any limited partner or us, the person bringing or prosecuting such proceeding will have the burden of overcoming such presumption; and |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | provides that our general partner and its officers and directors will not be liable for monetary damages to us or our limited partners for any acts or omissions unless there has been a final and non-appealable judgment entered by a court of competent jurisdiction determining that the general partner or those other persons acted in bad faith or engaged in fraud or willful misconduct or, in the case of a criminal matter, acted with knowledge that the conduct was criminal. |
|--------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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| §   | the ownership interest of unitholders immediately prior to the issuance will decrease; |
|--------------------|----------------------------------------------------------------------------------------|

| §   | the amount of cash available for distributions on each common unit may decrease; |
|--------------------|----------------------------------------------------------------------------------|

| §   | the relative voting strength of each previously outstanding common unit may be diminished; |
|--------------------|--------------------------------------------------------------------------------------------|

| §   | the ratio of taxable income to distributions may increase; and |
|--------------------|----------------------------------------------------------------|

| §   | the market price of our common units may decline. |
|--------------------|---------------------------------------------------|

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| §   | we were conducting business in a state, but had not complied with that particular state’s partnership statute; or |
|--------------------|-------------------------------------------------------------------------------------------------------------------------|

| §   | unitholders’ right to act with other unitholders to remove or replace our general partner, to approve some amendments to our partnership agreement or to take other actions under our partnership agreement constituted “control” of our business. |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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Item 1B.

Item 3. 

Item 4.

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PART II

Item 5.

|        |   |         |   |   |   |   |   | Cash Distribution History |
|-------------|--------|--------------|--------|--------|--------|--------|--------|---------------------------|
|        |   | Price Ranges |   |   | Per    |   | Record | Payment                   |
|        |   | High         |   |   | Low    |   |   | Unit                      |   | Date | Date |
| 2009        |   |         |   |   |   |   |   |                      |   |   |   |
| 1st Quarter |   | $            | 18.07  |   |   | $      | 13.55  |                      |   | $ | 0.4300 |   | April 30, 2009 | May 8, 2009 |
| 2nd Quarter |   | $            | 20.15  |   |   | $      | 14.75  |                      |   | $ | 0.4350 |   | July 31, 2009 | August 7, 2009 |
| 3rd Quarter |   | $            | 20.00  |   |   | $      | 15.91  |                      |   | $ | 0.4400 |   | October 30, 2009 | November 5, 2009 |
| 4th Quarter |   | $            | 24.19  |   |   | $      | 19.19  |                      |   | $ | 0.4450 |   | January 29, 2010 | February 5, 2010 |
| 2010        |   |         |   |   |   |   |   |                      |   |   |   |   |   |   |
| 1st Quarter |   | $            | 27.25  |   |   | $      | 22.08  |                      |   | $ | 0.4475 |   | April 30, 2010 | May 6, 2010 |
| 2nd Quarter |   | $            | 28.56  |   |   | $      | 22.27  |                      |   | $ | 0.4500 |   | July 30, 2010 | August 6, 2010 |
| 3rd Quarter |   | $            | 31.20  |   |   | $      | 26.04  |                      |   | $ | 0.4525 |   | October 29, 2010 | November 8, 2010 |
| 4th Quarter |   | $            | 33.39  |   |   | $      | 30.50  |                      |   | $ | 0.4550 |   | January 31, 2011 | February 7, 2011 |

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Item 6. 

|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |   | For the Year Ended December 31, |    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|--------------------------------------|---------|
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |   | 2010                                 |    |   | 2009 |   |   | 2008 |   |   | 2007 |   |   | 2006 |   |
| Operating Results Data:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |                                 |    |   |   |   |   |   |   |   |   |   |   |   |   |
| Revenues                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   | $                                    | 1,115.1 |   |   | $ | 979.3 |   |   | $ | 1,598.1 |   |   | $ | 1,220.3 |   |   | $ | 1,263.0 |   |
| Net income                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   |                                 | 53.4    |   |   |   | 45.8 |   |   |   | 55.3 |   |   |   | 23.6 |   |   |   | 51.7 |   |
| Net loss (income) attributable to noncontrolling interest (1)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   |                                 | 36.7    |   |   |   | 45.3 |   |   |   | (7.4 | ) |   |   | (20.0 | ) |   |   | -- |   |
| Net income attributable to Duncan Energy Partners L.P.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |   |                                 | 90.1    |   |   |   | 91.1 |   |   |   | 47.9 |   |   |   | 3.6 |   |   |   | 51.7 |   |
| Allocation of net income attributable to Duncan Energy Partners L.P.:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |   |                                 |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|    Limited partners of Duncan Energy Partners                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |   | $                                    | 89.5    |   |   | $ | 90.5 |   |   | $ | 27.8 |   |   | $ | 18.8 |   |   | $  | n/a |   |
|    General partner of Duncan Energy Partners                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |   |                                 | 0.6     |   |   |   | 0.6 |   |   |   | 0.5 |   |   |   | 0.4 |   |   |   | n/a |   |
|    Former owner of DEP II Midstream Businesses                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   |                                 | n/a     |   |   |   | n/a |   |   |   | 19.6 |   |   |   | (20.6 | ) |   |   | (3.7 | ) |
|    Former owner of DEP I Midstream Businesses                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |   |                                 | n/a     |   |   |   | n/a |   |   |   | n/a |   |   |   | 5.0 |   |   |   | 55.3 |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |   |                                 |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Basic and diluted earnings per unit                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   | $                                    | 1.55    |   |   | $ | 1.57 |   |   | $ | 1.22 |   |   | $ | 0.93 |   |   |   | n/a |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |   |                                 |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Cash distributions per common unit (2)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |   | $                                    | 1.81    |   |   | $ | 1.75 |   |   | $ | 1.68 |   |   | $ | 1.46 |   |   |   | n/a |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |   |                                 |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Financial position data:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |                                 |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Total assets (3)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   | $                                    | 5,571.9 |   |   | $ | 4,770.8 |   |   | $ | 4,594.7 |   |   | $ | 3,983.3 |   |   | $ | 3,798.4 |   |
| Total debt obligations (4)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   |                                 | 788.3   |   |   |   | 457.3 |   |   |   | 484.3 |   |   |   | 200.0 |   |   |   | n/a |   |
| Former owner’s equity in DEP II Midstream Businesses (5)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |                                 | n/a     |   |   |   | n/a |   |   |   | n/a |   |   |   | 2,880.1 |   |   |   | 2,853.8 |   |
| Former owner’s equity in DEP I Midstream Businesses (5)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   |                                 | n/a     |   |   |   | n/a |   |   |   | n/a |   |   |   | n/a |   |   |   | 725.8 |   |
| Equity (6)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   |                                 | 4,519.6 |   |   |   | 4,136.9 |   |   |   | 3,844.2 |   |   |   | 669.9 |   |   |   | n/a |   |
| Total common units outstanding  (7)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   |                                 | 57.7    |   |   |   | 57.7 |   |   |   | 57.7 |   |   |   | 20.3 |   |   |   | n/a |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |   |                                 |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| (1)   Represents EPO’s share of the earnings of the DEP I and DEP II Midstream Businesses following the drop down of each set of businesses to Duncan Energy Partners. The DEP I drop down transaction was effective February 1, 2007 for financial accounting and reporting purposes. The DEP II drop down transaction was effective December 8, 2008.(2)   Represents cash distributions declared by Duncan Energy Partners since its initial public offering in February 2007.(3)   Total assets have increased since our initial public offering due to capital spending.(4)   Represents our DEP Multi-Year Revolving Credit Facility, $400 Million Term Loan Facility, Revolving Credit Facility and Term Loan Agreement, as applicable, for the periods in which Duncan Energy Partners had borrowings outstanding under each agreement. See Note 11 of the Notes to Consolidated Financial Statements included under Item 8 of this annual report for additional information regarding these debt obligations.(5)   Represents the net assets of the combined DEP I or DEP II Midstream Businesses (as applicable) prior to the date they were contributed to Duncan Energy Partners.(6)   Represents the noncontrolling interest in subsidiaries, limited and general partner capital accounts and related accumulated other comprehensive income of Duncan Energy Partners since February 2007.(7)   The amount presented for December 31, 2008 includes 37.3 million Class B units that converted to common units on February 1, 2009. |   |

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Item 7. 

| §   | Cautionary Note Regarding Forward-Looking Statements. |
|--------------------|-------------------------------------------------------|

| §   | Overview of Business. |
|--------------------|-----------------------|

| §   | Basis of Financial Statement Presentation. |
|--------------------|--------------------------------------------|

| §   | Supplemental Selected Financial Information of Duncan Energy Partners L.P. – Discusses financial information and sources and uses of cash for Duncan Energy Partners L.P. on a standalone basis. |
|--------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Significant Recent Developments – Discusses significant developments during the year ended December 31, 2010 and through the date of this filing. |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | General Outlook for 2011. |
|--------------------|---------------------------|

| §   | Results of Operations – Discusses material year-to-year variances in our Statements of Consolidated Operations. |
|--------------------|-----------------------------------------------------------------------------------------------------------------------|

| §   | Liquidity and Capital Resources – Addresses available sources of liquidity and capital resources and includes a discussion of our capital spending program. |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Critical Accounting Policies and Estimates. |
|--------------------|---------------------------------------------|

| §   | Other Items – Includes information related to contractual obligations, off-balance sheet arrangements and all other matters. |
|--------------------|------------------------------------------------------------------------------------------------------------------------------------|

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|                                                                                                                              |   | For the Year Ended December 31, |   |
|-----------------------------------------------------------------------------------------------------------------------------------|--------|---------------------------------|--------|
|                                                                                                                              |   | 2010                            |   |   | 2009 |   |   | 2008 |   |
|                                                                                                                              |   | (dollars in millions)      |   |
| Selected income statement information:                                                                                            |   |                            |   |   |   |   |   |   |   |
| Equity in income - DEP I Midstream Businesses                                                                                     |   | $                               | 47.8   |   |   | $ | 44.9 |   |   | $ | 37.2 |   |
| Equity in income - DEP II Midstream Businesses                                                                                    |   | $                               | 56.0   |   |   | $ | 60.1 |   |   | $ | 4.5 |   |
| General and administrative costs                                                                                                  |   | $                               | 1.8    |   |   | $ | 0.4 |   |   | $ | 1.4 |   |
| Interest expense                                                                                                                  |   | $                               | 11.9   |   |   | $ | 13.5 |   |   | $ | 12.0 |   |
| Net income attributable to partners                                                                                               |   | $                               | 90.1   |   |   | $ | 91.1 |   |   | $ | 28.3 |   |
| Selected balance sheet information at each period end:                                                                            |   |                            |   |   |   |   |   |   |   |   |   |   |
| Investments in DEP I Midstream Businesses (1)                                                                                     |   | $                               | 854.6  |   |   | $ | 510.2 |   |   | $ | 512.7 |   |
| Investments in DEP II Midstream Businesses                                                                                        |   | $                               | 677.6  |   |   | $ | 709.7 |   |   | $ | 730.5 |   |
| Total debt obligations                                                                                                            |   | $                               | 788.3  |   |   | $ | 457.3 |   |   | $ | 484.3 |   |
| Partners’ equity                                                                                                            |   | $                               | 760.4  |   |   | $ | 761.4 |   |   | $ | 752.8 |   |
| (1)   The $344.4 million increase since December 31, 2009 is primarily due to our funding of the Haynesville Extension. |   |

|                                                                                    |   | For the Year Ended December 31, |   |
|-----------------------------------------------------------------------------------------|--------|---------------------------------|--------|
|                                                                                    |   | 2010                            |   |   | 2009 |   |   | 2008 |   |
|                                                                                    |   | (dollars in millions)           |   |
| Distributions paid to Duncan Energy Partners L.P.                                       |   |                            |   |   |   |   |   |   |   |
|          with respect to each period from: |   |                            |   |   |   |   |   |   |   |
| DEP I Midstream Businesses                                                              |   | $                               | 46.5   |   |   | $ | 49.2 |   |   | $ | 93.7 |   |
| DEP II Midstream Businesses                                                             |   | $                               | 88.2   |   |   | $ | 86.5 |   |   | $ | 5.6 |   |

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|                                                                                                                                                                                                      |   | For the Year Ended December 31, |   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|---------------------------------|--------|
|                                                                                                                                                                                                      |   | 2010                            |   |   | 2009 |   |   | 2008 |   |
| Natural Gas Pipelines & Services, net:                                                                                                                                                                |   |                            |   |   |   |   |   |   |   |
|    Natural gas throughput volumes (BBtus/d)                                                                                                                                                |   |                            |   |   |   |   |   |   |   |
|       Texas Intrastate System                                                                                                                                               |   |                            | 3,898  |   |   |   | 3,902 |   |   |   | 4,021 |   |
|       Acadian Gas System:                                                                                                                                                   |   |                            |   |   |   |   |   |   |   |   |   |   |
|           Transportation volumes                                                                                                                        |   |                            | 455    |   |   |   | 436 |   |   |   | 378 |   |
|           Sales volumes (1)                                                                                                                             |   |                            | 339    |   |   |   | 320 |   |   |   | 331 |   |
|       Total natural gas throughput volumes                                                                                                                                  |   |                            | 4,692  |   |   |   | 4,658 |   |   |   | 4,730 |   |
| NGL Pipelines & Services, net:                                                                                                                                                                        |   |                            |   |   |   |   |   |   |   |   |   |   |
|     NGL throughput volumes (MBPD)                                                                                                                                                     |   |                            |   |   |   |   |   |   |   |   |   |   |
|        South Texas NGL System - Pipelines                                                                                                                              |   |                            | 124    |   |   |   | 109 |   |   |   | 126 |   |
|     NGL fractionation volumes (MBPD)                                                                                                                                                  |   |                            |   |   |   |   |   |   |   |   |   |   |
|        South Texas NGL System - Shoup and Armstrong fractionators                                                                                                      |   |                            | 79     |   |   |   | 77 |   |   |   | 80 |   |
| Petrochemical Services, net:                                                                                                                                                                              |   |                            |   |   |   |   |   |   |   |   |   |   |
|    Propylene throughput volumes (MBPD)                                                                                                                                                     |   |                            |   |   |   |   |   |   |   |   |   |   |
|       Lou-Tex Propylene Pipeline                                                                                                                                            |   |                            | 23     |   |   |   | 21 |   |   |   | 25 |   |
|       Sabine Propylene Pipeline                                                                                                                                             |   |                            | 12     |   |   |   | 9 |   |   |   | 10 |   |
|       Total propylene throughput volumes                                                                                                                                    |   |                            | 35     |   |   |   | 30 |   |   |   | 35 |   |
|                                                                                                                                                                                                      |   |                            |   |   |   |   |   |   |   |   |   |   |
| (1)   Includes average net sales volumes for Evangeline of 47 BBtus/d for the year ended December 31, 2010 and 50 BBtus/d for each of the years ended December 31, 2009 and 2008, respectively. |   |

|                                                       |   | For the Year Ended December 31, |    |
|------------------------------------------------------------|--------|---------------------------------|---------|
|                                                       |   | 2010                            |    |   | 2009 |   |   | 2008 |   |
| Revenues                                                   |   | $                               | 1,115.1 |   |   | $ | 979.3 |   |   | $ | 1,598.1 |   |
| Operating costs and expenses                               |   |                            | 1,030.4 |   |   |   | 908.3 |   |   |   | 1,512.8 |   |
| General and administrative costs                           |   |                            | 20.0    |   |   |   | 11.2 |   |   |   | 18.3 |   |
| Equity in income of Evangeline                             |   |                            | 0.8     |   |   |   | 1.1 |   |   |   | 0.9 |   |
| Operating income                                           |   |                            | 65.5    |   |   |   | 60.9 |   |   |   | 67.9 |   |
| Interest expense                                           |   |                            | 12.1    |   |   |   | 14.0 |   |   |   | 12.0 |   |
| Net income                                                 |   |                            | 53.4    |   |   |   | 45.8 |   |   |   | 55.3 |   |
| Net loss (income) attributable to noncontrolling interest: |   |                            |    |   |   |   |   |   |   |   |   |   |
| DEP I Midstream Businesses – Parent                  |   |                            | (27.7   | ) |   |   | (15.3 | ) |   |   | (11.4 | ) |
| DEP II Midstream Businesses – Parent                 |   |                            | 64.4    |   |   |   | 60.6 |   |   |   | 4.0 |   |
| Net income attributable to Duncan Energy Partners          |   |                            | 90.1    |   |   |   | 91.1 |   |   |   | 47.9 |   |

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|                                 |   | For the Year Ended December 31, |   |
|--------------------------------------|--------|---------------------------------|--------|
|                                 |   | 2010                            |   |   | 2009 |   |   | 2008 |   |
| Natural Gas Pipelines & Services |   | $                               | 167.2  |   |   | $ | 148.2 |   |   | $ | 159.0 |   |
| NGL Pipelines & Services         |   |                            | 122.8  |   |   |   | 103.4 |   |   |   | 82.9 |   |
| Petrochemical Services               |   |                            | 9.6    |   |   |   | 10.5 |   |   |   | 11.1 |   |
| Total segment gross operating margin |   | $                               | 299.6  |   |   | $ | 262.1 |   |   | $ | 253.0 |   |

|                                     |   | For the Year Ended December 31, |    |
|------------------------------------------|--------|---------------------------------|---------|
|                                     |   | 2010                            |    |   | 2009 |   |   | 2008 |   |
| Natural Gas Pipelines & Services:    |   |                            |    |   |   |   |   |   |   |
| Sales of natural gas                     |   | $                               | 536.5   |   |   | $ | 460.2 |   |   | $ | 1,100.2 |   |
| Natural gas transportation services      |   |                            | 286.1   |   |   |   | 263.2 |   |   |   | 246.7 |   |
| Natural gas storage services             |   |                            | 16.0    |   |   |   | 15.3 |   |   |   | 8.4 |   |
| Total segment revenues                   |   | $                               | 838.6   |   |   | $ | 738.7 |   |   | $ | 1,355.3 |   |
|                                     |   |                            |    |   |   |   |   |   |   |   |   |   |
| NGL Pipelines & Services:            |   |                            |    |   |   |   |   |   |   |   |   |   |
| Sales of NGLs                            |   | $                               | 45.9    |   |   | $ | 35.0 |   |   | $ | 47.9 |   |
| Sales of other products                  |   |                            | 18.2    |   |   |   | 11.3 |   |   |   | 15.0 |   |
| NGL and related product storage services |   |                            | 120.5   |   |   |   | 104.9 |   |   |   | 87.4 |   |
| NGL fractionation services               |   |                            | 30.8    |   |   |   | 29.5 |   |   |   | 32.4 |   |
| NGL transportation services              |   |                            | 45.4    |   |   |   | 43.8 |   |   |   | 43.6 |   |
| Other services                           |   |                            | 2.1     |   |   |   | 2.5 |   |   |   | 2.3 |   |
| Total segment revenues                   |   | $                               | 262.9   |   |   | $ | 227.0 |   |   | $ | 228.6 |   |
|                                     |   |                            |    |   |   |   |   |   |   |   |   |   |
| Petrochemical Services:                  |   |                            |    |   |   |   |   |   |   |   |   |   |
| Propylene transportation services        |   | $                               | 13.6    |   |   | $ | 13.6 |   |   | $ | 14.2 |   |
|                                     |   |                            |    |   |   |   |   |   |   |   |   |   |
| Total consolidated revenues              |   | $                               | 1,115.1 |   |   | $ | 979.3 |   |   | $ | 1,598.1 |   |

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|                                            |   | For the Year Ended December 31, |   |
|-------------------------------------------------|--------|---------------------------------|--------|
|                                            |   | 2010                            |   |   | 2009 |   |   | 2008 |   |
| Net cash flows provided by operating activities |   | $                               | 310.4  |   |   | $ | 201.6 |   |   | $ | 220.1 |   |
| Cash used in investing activities               |   |                            | 927.3  |   |   |   | 428.8 |   |   |   | 748.8 |   |
| Cash provided by financing activities           |   |                            | 645.4  |   |   |   | 218.1 |   |   |   | 539.5 |   |

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| §   | A $591.8 million increase in capital expenditures as a result of expansion projects such as the Haynesville Extension and those of our Texas Intrastate System. |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | A $45.6 million cash inflow in January 2010 attributable to EPO’s repayment of a temporary cash advance made by a subsidiary in December 2009. |
|--------------------|------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Net borrowings under bank credit agreements of $331.0 million in 2010 compared to net repayments of $27.0 million in 2009.  The increased borrowing is a result of capital spending requirements for our share of the Haynesville Extension project and use of proceeds from our new |
|--------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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|    | long-term credit facilities to terminate our Revolving Credit Facility and Loan Agreement with EPO in October 2010.  See Note 11 of the Notes to Consolidated Financial Statements included under Item 8 of this annual report for additional information regarding our new long-term credit facilities and the termination of our Revolving Credit Facility and Loan Agreement with EPO. |
|--------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | A $131.6 million increase in contributions from EPO, as noncontrolling interest, related to its funding of all or a portion of expansion capital project costs. |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | A $57.5 million increase in distributions consisting of a $15.4 million increase in distributions to our unitholders and general partner and a $42.1 million increase in distributions to EPO (as noncontrolling interest).  Declared distributions are paid in the quarter following their declaration; therefore, the cash amount for 2009 includes distributions related to the fourth quarter of 2008, which reflects a prorated amount of distributions from the DEP II Midstream Businesses for the period December 8, 2008 through December 31, 2008, plus cash distributions pertaining to the first three quarters of 2009.  Cash distributions for 2010 reflect a full year of distributions from the DEP II Midstream Businesses. |
|--------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | In June 2009, we completed an offering of 8,000,000 common units that generated net cash proceeds of approximately $122.9 million after underwriting discounts and other expenses.  In July 2009, the underwriters to this offering exercised their option to purchase an additional 943,400 common units, which generated approximately $14.5 million of additional net cash proceeds.  The total net cash proceeds from this offering, including the overallotment amount, were used to repurchase an equal number of our common units beneficially owned by EPO: 8,000,000 units were repurchased in June 2009 and 943,400 units were repurchased in July 2009.  The repurchased common units were subsequently cancelled. |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | A $311.2 million decrease in net borrowings under our credit agreements.  Borrowings for 2008 include the $282.3 million we borrowed under the Term Loan Agreement to fund the $280.5 million cash consideration paid to EPO in connection with the DEP II drop down transaction in December 2008. Cash distributions paid to EPO as noncontrolling interest decreased $266.5 million year-to-year primarily due to the $280.5 million payment made to EPO in connection with the DEP II drop down. |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | A $54.5 million increase in distributions to our unitholders and general partner attributable to an increase in the number of our common units outstanding and the quarterly cash distribution rates. |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | A $222.9 million decrease in contributions from EPO (as both former owner of the DEP II Midstream Businesses prior to December 8, 2008 and as noncontrolling interest owner in the DEP I Midstream Businesses and the DEP II Midstream Businesses (post-December 8, 2008)).   The decrease in contributions is generally due to the lower level of capital expenditures we made during 2009 compared to 2008. |
|--------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   | For the Year Ended December 31, |   |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|---------------------------------|--------|
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   | 2010                            |   |   | 2009 |   |   | 2008 |   |
| DEP I Midstream Businesses:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |   |                            |   |   |   |   |   |   |   |
| Expansion capital spending (1)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   | $                               | 613.8  |   |   | $ | 28.5 |   |   | $ | 127.7 |   |
| Sustaining capital expenditures (2)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |                            | 18.9   |   |   |   | 13.9 |   |   |   | 12.8 |   |
| DEP II Midstream Businesses:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |                            |   |   |   |   |   |   |   |   |   |   |
| Expansion capital spending (1)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |                            | 309.3  |   |   |   | 311.0 |   |   |   | 576.5 |   |
| Sustaining capital expenditures (2)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |                            | 43.1   |   |   |   | 35.7 |   |   |   | 42.5 |   |
| Total capital spending                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   | $                               | 985.1  |   |   | $ | 389.1 |   |   | $ | 759.5 |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |                            |   |   |   |   |   |   |   |   |   |   |
| (1)   EPO funded 100% of expansion capital spending for 2009 and 2008. In 2010, we elected to participate in the Haynesville Extension project with EPO in accordance with our respective ownership interests in Acadian Gas. We have also elected to participate in a Mont Belvieu Caverns project that consists of converting two storage caverns from NGL to refined products service, one of which was completed in November 2010.(2)   Sustaining capital expenditures are capital expenditures (as defined by U.S. GAAP) resulting from improvements to and major renewals of existing assets. Such expenditures serve to maintain existing operations but do not generate additional revenues. |   |

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|        |   | For the Year Ended December 31, |   |
|-------------|--------|---------------------------------|--------|
|        |   | 2010                            |   |   | 2009 |   |   | 2008 |   |
| Expensed    |   | $                               | 14.3   |   |   | $ | 14.1 |   |   | $ | 20.6 |   |
| Capitalized |   |                            | 10.3   |   |   |   | 17.0 |   |   |   | 22.9 |   |
| Total       |   | $                               | 24.6   |   |   | $ | 31.1 |   |   | $ | 43.5 |   |

| §   | changes in laws and regulations that limit the estimated economic life of an asset;  |
|--------------------|-------------------------------------------------------------------------------------------|

| §   | changes in technology that render an asset obsolete; |
|--------------------|------------------------------------------------------|

| §   | changes in expected salvage values; or |
|--------------------|----------------------------------------|

| §   | significant changes in the forecast life of proved reserves of applicable resource basins, if any. |
|--------------------|----------------------------------------------------------------------------------------------------|

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| §   | the expected useful life of the related tangible assets (e.g., fractionation facility, pipeline or other asset); |
|--------------------|------------------------------------------------------------------------------------------------------------------|

| §   | any legal or regulatory developments that would impact such contractual rights; and |
|--------------------|-------------------------------------------------------------------------------------|

| §   | any contractual provisions that enable us to renew or extend such agreements. |
|--------------------|-------------------------------------------------------------------------------|

| §   | discrete financial forecasts for the assets classified within the reporting unit, which rely on management’s estimates of operating margins and transportation volumes; |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | long-term growth rates for cash flows beyond the discrete forecast period; and |
|--------------------|--------------------------------------------------------------------------------|

| §   | appropriate discount rates. |
|--------------------|-----------------------------|

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| §   | persuasive evidence of an exchange arrangement exists; |
|--------------------|--------------------------------------------------------|

| §   | delivery has occurred or services have been rendered; |
|--------------------|-------------------------------------------------------|

| §   | the buyer’s price is fixed or determinable; and |
|--------------------|-------------------------------------------------------|

| §   | collectibility is reasonably assured. |
|--------------------|---------------------------------------|

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|                                                                                                                                                            |   | December 31, |   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|--------------|--------|
|                                                                                                                                                            |   | 2010         |   |   | 2009 |   |
| Natural gas imbalance receivables                                                                                                                               |   | $            | 11.5   |   |   | $ | 9.8 |   |
| Natural gas imbalance payables (1)                                                                                                                              |   |         | 10.6   |   |   |   | 11.0 |   |
| (1)   Reflected as a component of “Accrued product payables” on our Consolidated Balance Sheets included in Item 8 of this annual report. |   |

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|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   | Payment or Settlement due by Period |    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|-------------------------------------|---------|
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |                                |    |   | Less than |   |   | 1-3 |   |   | 4-5 |   |   | More than |   |
| Contractual Obligations (1)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |   | Total                               |    |   | 1 year |   |   | years |   |   | years |   |   | 5 years |   |
| Scheduled maturities of debt obligations (2)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   | $                                   | 788.3   |   |   | $ | 282.3 |   |   | $ | 506.0 |   |   | $ | -- |   |   | $ | -- |   |
| Estimated cash interest payments (3)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   | $                                   | 34.6    |   |   | $ | 14.1 |   |   | $ | 20.5 |   |   | $ | -- |   |   | $ | -- |   |
| Operating lease obligations (4)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   | $                                   | 107.2   |   |   | $ | 8.9 |   |   | $ | 16.1 |   |   | $ | 12.9 |   |   | $ | 69.3 |   |
| Purchase obligations:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |                                |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Product purchase commitments:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |   |                                |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Estimated payment obligations:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |   |                                |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Natural gas (5)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   | $                                   | 294.9   |   |   | $ | 172.5 |   |   | $ | 122.4 |   |   | $ | -- |   |   | $ | -- |   |
| Other                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   | $                                   | *       |   |   | $ | * |   |   | $ | * |   |   | $ | -- |   |   | $ | -- |   |
| Underlying major volume commitments:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |                                |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Natural gas (in BBtus)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |   |                                | 69,959  |   |   |   | 40,926 |   |   |   | 29,033 |   |   |   | -- |   |   |   | -- |   |
| Capital expenditure commitments (6)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |   | $                                   | 285.3   |   |   | $ | 285.3 |   |   | $ | -- |   |   | $ | -- |   |   | $ | -- |   |
| Other long-term liabilities (7)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   | $                                   | 13.4    |   |   | $ | -- |   |   | $ | 0.3 |   |   | $ | 0.2 |   |   | $ | 12.9 |   |
| Total                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   | $                                   | 1,523.7 |   |   | $ | 763.1 |   |   | $ | 665.3 |   |   | $ | 13.1 |   |   | $ | 82.2 |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |                                |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| * Amounts are negligible.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |                                |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| (1)   The contractual obligations presented in this table reflect 100% of our subsidiaries’ obligations even though we own less than a 100% equity interest in our operating subsidiaries.(2)   Represents our scheduled future maturities of consolidated debt principal obligations for the periods indicated. See Note 11 of the Notes to Consolidated Financial Statements included under Item 8 of this annual report for information regarding our debt obligations.(3)   Our estimated cash payments for interest are based on the principal amount of consolidated debt obligations outstanding at December 31, 2010. In calculating these amounts, we applied the weighted-average variable interest rates paid during 2010 associated with such debt. See Note 11 of the Notes to Consolidated Financial Statements included under Item 8 of this annual report for the weighted-average variable interest rates charged during 2010 under our credit agreements.(4)   Primarily represents operating leases for underground caverns for the storage of natural gas and NGLs and land held pursuant to right-of-way agreements. See Note 17 of the Notes to Consolidated Financial Statements included under Item 8 of this annual report for information regarding our operating leases.(5)   Represents enforceable and legally binding natural gas purchase commitments of Acadian Gas. See Note 17 of the Notes to Consolidated Financial Statements included under Item 8 of this annual report for information regarding our purchase obligations. The estimated payment obligations are based on contractual prices in effect at December 31, 2010 applied to all future volume commitments. Actual future payment obligations may vary depending on prices at the time of delivery.(6)   Represents short-term unconditional payment obligations related to our capital projects (on a 100% basis). With respect to the amount presented, we expect reimbursements of $113.4 million from EPO.(7)   As reflected on our Consolidated Balance Sheet at December 31, 2010, other long-term liabilities primarily represent noncurrent portions of asset retirement obligations. For information regarding our asset retirement obligations, see Note 8 of our Notes to Consolidated Financial Statements included under Item 8 of this annual report. |   |

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|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |   | For the Year Ended December 31, |   |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|---------------------------------|--------|
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |   | 2010                            |   |   | 2009 |   |   | 2008 |   |
| Total segment gross operating margin                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |   | $                               | 299.6  |   |   | $ | 262.1 |   |   | $ | 253.0 |   |
| Adjustments to reconcile total segment grossoperating margin to operating income:                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |   |                            |   |   |   |   |   |   |   |   |   |   |
| Depreciation, amortization and accretion inoperating costs and expenses (1)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |   |                            | (201.0 | ) |   |   | (186.3 | ) |   |   | (167.3 | ) |
| Non-cash asset impairment charges included inoperating costs and expenses (2)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   |                            | (5.2   | ) |   |   | (4.2 | ) |   |   | -- |   |
| Gain (loss) from asset sales and relatedtransactions in operating costs and expenses (3)                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |                            | (7.9   | ) |   |   | 0.5 |   |   |   | 0.5 |   |
| General and administrative costs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |                            | (20.0  | ) |   |   | (11.2 | ) |   |   | (18.3 | ) |
| Operating income                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |                            | 65.5   |   |   |   | 60.9 |   |   |   | 67.9 |   |
| Other expense, net                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |                            | (12.1  | ) |   |   | (13.8 | ) |   |   | (11.5 | ) |
| Income before provision for income taxes                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   | $                               | 53.4   |   |   | $ | 47.1 |   |   | $ | 56.4 |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |   |                            |   |   |   |   |   |   |   |   |   |   |
| (1)   Amount is a component of “Depreciation, amortization and accretion” as presented on the Statements of Consolidated Cash Flows.(2)   See Note 6 of the Notes to Consolidated Financial Statements included under Item 8 of this annual report for additional information regarding non-cash asset impairment charges.(3)   Amount presented for the twelve months ended December 31, 2010 includes a $9.1 million loss related to the disposal of a non-strategic pipeline segment owned by Enterprise Texas. |   |

| §   | Disclosure of Supplementary Pro Forma Information for Business Combinations; |
|--------------------|------------------------------------------------------------------------------|

| §   | Roadmap to Adoption of International Reporting Standards; and |
|--------------------|---------------------------------------------------------------|

| §   | Fair Value Measurements. |
|--------------------|--------------------------|

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Item 7A.

|                                                    |                    |   | Portfolio FV at  |   |
|---------------------------------------------------------|-------------------------|--------|------------------|--------|
| Scenario                                                | ResultingClassification |   | December 31,2009 |   |   | December 31,2010 |   |   | January 31,2011 |   |
| FV assuming no change in underlying commodity prices    | Asset (Liability)       |   | $                | *      |   |   | $ | * |   |   | $ | * |   |
| FV assuming 10% increase in underlying commodity prices | Asset (Liability)       |   |             | *      |   |   |   | * |   |   |   | * |   |
| FV assuming 10% decrease in underlying commodity prices | Asset (Liability)       |   |             | *      |   |   |   | * |   |   |   | * |   |
| * Amounts are negligible                                |                    |

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Item 8.

Item 9. 

Item 9A

| (i)   | that our disclosure controls and procedures are designed to ensure that information required to be disclosed by us in the reports that we file or submit under the Securities Exchange Act of 1934 is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and that such information is accumulated and communicated to our management, including the CEO and CFO, as appropriate to allow timely decisions regarding required disclosure; and |
|-----------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (ii)   | that our disclosure controls and procedures are effective. |
|------------------|------------------------------------------------------------|

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| /s/ W. Randall Fowler |                             | /s/ Bryan Bulawa |
|-----------------------|----------------------------------|------------------|
| Name:                 | W. Randall Fowler                |             | Name: | Bryan Bulawa |
| Title:                | Chief Executive Officer of       |             | Title: | Chief Financial Officer of |
|                  |   our general partner, |             |   |   our general partner, |
|                  |   DEP Holdings, LLC    |             |   |   DEP Holdings, LLC |

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Item 9B. 

PART III

Item 10. 

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| §   | review potential conflicts of interest, including related party transactions; |
|--------------------|-------------------------------------------------------------------------------|

| §   | monitoring the integrity of our financial reporting process and related systems of internal control; |
|--------------------|------------------------------------------------------------------------------------------------------|

| §   | ensuring our legal and regulatory compliance and that of DEP GP; |
|--------------------|------------------------------------------------------------------|

| §   | overseeing the independence and performance of our independent public accountant; |
|--------------------|-----------------------------------------------------------------------------------|

| §   | approving all services performed by our independent public accountant; |
|--------------------|------------------------------------------------------------------------|

| §   | providing for an avenue of communication among the independent public accountant, management, internal audit function and the Board; |
|--------------------|--------------------------------------------------------------------------------------------------------------------------------------|

| §   | encouraging adherence to and continuous improvement of our policies, procedures and practices at all levels;  |
|--------------------|--------------------------------------------------------------------------------------------------------------------|

| §   | reviewing areas of potential significant financial risk to our businesses; and |
|--------------------|--------------------------------------------------------------------------------|

| §   | approving awards granted under our long-term incentive plans. |
|--------------------|---------------------------------------------------------------|

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| Name                                                                                                              |   | Age    |   | Position with DEP GP                                                   |
|-------------------------------------------------------------------------------------------------------------------|--------|--------|--------|------------------------------------------------------------------------|
| W. Randall Fowler (1)                                                                                             |   | 54     |   | Director, President and Chief Executive Officer                        |
| William A. Bruckmann, III (2,3)                                                                                   |   | 59     |   | Director                                                               |
| Larry J. Casey (2)                                                                                                |   | 78     |   | Director                                                               |
| Richard S. Snell (2)                                                                                              |   | 68     |   | Director                                                               |
| Bryan F. Bulawa (1)                                                                                               |   | 41     |   | Director, Senior Vice President, Treasurer and Chief Financial Officer |
| A. James Teague (1)                                                                                               |   | 65     |   | Executive Vice President and Chief Commercial Officer                  |
| William Ordemann (1)                                                                                              |   | 51     |   | Executive Vice President                                               |
| Stephanie C. Hildebrandt (1)                                                                                      |   | 46     |   | Senior Vice President, Chief Legal Officer and Secretary               |
| Michael J. Knesek (1)                                                                                             |   | 56     |   | Senior Vice President, Controller and Principal Accounting Officer     |
|                                                                                                              |   |   |   |                                                                   |
| (1)   Executive Officer(2)   Member of ACG Committee(3)   Chairman of ACG Committee |

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Item 11

|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |   | Cash   |    |   | Cash    |   |    | Unit    |   |   | Option  |   |   | All Other |    |   |   |   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|--------|--------|---------|--------|---------|--------|---------|---------|--------|--------|---------|--------|--------|-----------|---------|--------|--------|--------|
| Name and                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |   | Salary |    |   | Bonus   |   |    | Awards  |   |   | Awards  |   |   | Comp.     |    |   | Total  |   |
| Principal Position                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | Year   |   | ($)    |    |   | ($) (1) |   |    | ($) (2) |   |   | ($) (3) |   |   | ($) (4)   |    |   | ($)    |   |
| W. Randall Fowler (5)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | 2010   |   | $      | 65,625  |   |    | $      | 62,500  |    |   | $      | 164,577 |   |   | $         | 17,409  |   |   | $      | 39,641 |   |   | $ | 349,752 |   |
| (President and CEO;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 2009   |   |   | 55,781  |   |    |   | 95,625  |    |   |   | 262,684 |   |   |      | 65,416  |   |   |   | 21,660 |   |   |   | 501,166 |   |
|     former Executive Vice President and CFO)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | 2008   |   |   | 63,594  |   |    |   | 43,750  |    |   |   | 459,152 |   |   |      | 17,850  |   |   |   | 20,882 |   |   |   | 605,228 |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |   |   |    |   |    |   |    |    |   |   |    |   |   |      |    |   |   |   |   |   |   |   |   |   |
| Richard H. Bachmann (6)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 2010   |   |   | 24,188  |   |    |   | 24,375  |    |   |   | 256,547 |   |   |      | 26,113  |   |   |   | 15,809 |   |   |   | 347,032 |   |
| (former President and CEO)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | 2009   |   |   | 129,000 |   |    |   | 190,000 |    |   |   | 550,867 |   |   |      | 133,080 |   |   |   | 47,295 |   |   |   | 1,050,242 |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 2008   |   |   | 159,688 |   |    |   | 106,250 |    |   |   | 972,925 |   |   |      | 35,700  |   |   |   | 59,055 |   |   |   | 1,333,618 |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |   |   |    |   |    |   |    |    |   |   |    |   |   |      |    |   |   |   |   |   |   |   |   |   |
| Bryan F. Bulawa                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 2010   |   |   | 29,888  |   |    |   | 16,500  |    |   |   | 22,589  |   |   |      | 2,901   |   |   |   | 9,974 |   |   |   | 81,852 |   |
| (Senior Vice President and CFO)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |   |   |    |   |    |   |    |    |   |   |    |   |   |      |    |   |   |   |   |   |   |   |   |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |   |   |    |   |    |   |    |    |   |   |    |   |   |      |    |   |   |   |   |   |   |   |   |   |
| A. James Teague                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 2010   |   |   | 162,500 |   |    |   | 162,500 |    |   |   | 427,578 |   |   |      | 43,522  |   |   |   | 93,111 |   |   |   | 889,211 |   |
| (Executive Vice President and                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 2009   |   |   | 162,500 |   |    |   | 237,500 |    |   |   | 611,396 |   |   |      | 166,350 |   |   |   | 58,437 |   |   |   | 1,236,183 |   |
|     Chief Commercial Officer)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |   |   |    |   |    |   |    |    |   |   |    |   |   |      |    |   |   |   |   |   |   |   |   |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |   |   |    |   |    |   |    |    |   |   |    |   |   |      |    |   |   |   |   |   |   |   |   |   |
| William Ordemann                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | 2010   |   |   | 81,260  |   |    |   | 50,000  |    |   |   | 218,145 |   |   |      | 34,817  |   |   |   | 56,635 |   |   |   | 440,857 |   |
|     (Executive Vice President)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | 2009   |   |   | 63,232  |   |    |   | 49,600  |    |   |   | 262,919 |   |   |      | 90,552  |   |   |   | 35,275 |   |   |   | 501,578 |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 2008   |   |   | 15,656  |   |    |   | 10,600  |    |   |   | 71,192  |   |   |      | 5,712   |   |   |   | 6,314 |   |   |   | 109,474 |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |   |   |    |   |    |   |    |    |   |   |    |   |   |      |    |   |   |   |   |   |   |   |   |   |
| Michael J. Knesek                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 2010   |   |   | 52,075  |   |    |   | 30,063  |    |   |   | 60,506  |   |   |      | 13,057  |   |   |   | 21,744 |   |   |   | 177,445 |   |
| (Senior Vice President, Controller                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | 2009   |   |   | 50,700  |   |    |   | 27,625  |    |   |   | 158,996 |   |   |      | 54,064  |   |   |   | 17,099 |   |   |   | 308,484 |   |
|     and Principal Accounting Officer)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | 2008   |   |   | 61,800  |   |    |   | 26,000  |    |   |   | 185,478 |   |   |      | 14,280  |   |   |   | 21,200 |   |   |   | 308,758 |   |
| (1)   Amounts represent discretionary annual cash awards accrued with respect to the years presented. Cash awards are paid in February of the following year (e.g., the cash awards for 2010 were paid in February 2011).(2)   Amounts represent our estimated share of the aggregate grant date fair value of Enterprise’s restricted common unit awards and limited partnership interests in the Employee Partnerships granted during each year presented. For information about assumptions made in the valuation of these awards and limited partner interests, see Note 5 of the Notes to Consolidated Financial Statements included under Item 8 of this annual report, which information is incorporated by reference into this Item 11.(3)   Amounts represent our estimated share of the aggregate grant date fair value of unit option awards granted during each year presented. For information about assumptions made in the valuation of these awards, see Note 5 of the Notes to Consolidated Financial Statements included under Item 8 of this annual report, which information is incorporated by reference into this Item 11.(4)   Amounts primarily represent (i) matching contributions under funded, qualified, defined contribution retirement plans, (ii) quarterly distributions paid on incentive plan awards and (iii) the imputed value of life insurance premiums paid on behalf of the officer.(5)   Mr. Fowler was elected President and CEO of our general partner on April 23, 2010. Prior to this election, Mr. Fowler served as our Executive Vice President and CFO.(6)   Mr. Bachmann served as President and CEO of our general partner until April 23, 2010. Mr. Bachmann currently serves as President and CEO of EPCO and one of the three EPCO Trustees. |   |

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|                           |   | Duncan   | EPCO and   | Total     |
|--------------------------------|--------|----------|------------|-----------|
|                           |   | Energy   | other      | Time      |
| Named Executive Officer        | Year   | Partners | affiliates | Allocated |
| W. Randall Fowler (CEO)        | 2010   | 13%      | 87%        | 100%      |
|                           | 2009   | 11%      | 89%        | 100%      |
|                           | 2008   | 12%      | 88%        | 100%      |
|                           |   |     |       |      |
| Richard H. Bachmann            | 2010   | 4%       | 96%        | 100%      |
|    (former CEO) | 2009   | 20%      | 80%        | 100%      |
|                           | 2008   | 25%      | 75%        | 100%      |
|                           |   |     |       |      |
| Bryan F. Bulawa (CFO)          | 2010   | 10%      | 90%        | 100%      |
|                           |   |     |       |      |
| A. James Teague                | 2010   | 25%      | 75%        | 100%      |
|                           | 2009   | 25%      | 75%        | 100%      |
|                           |   |     |       |      |
| William Ordemann               | 2010   | 20%      | 80%        | 100%      |
|                           | 2009   | 16%      | 84%        | 100%      |
|                           | 2008   | 4%       | 96%        | 100%      |
|                           |   |     |       |      |
| Michael J. Knesek              | 2010   | 16%      | 84%        | 100%      |
|                           | 2009   | 16%      | 84%        | 100%      |
|                           | 2008   | 20%      | 80%        | 100%      |

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| §   | Annual cash base salary; |
|--------------------|--------------------------|

| §   | Discretionary annual cash bonus awards; |
|--------------------|-----------------------------------------|

| §   | Awards under long-term incentive arrangements; and |
|--------------------|----------------------------------------------------|

| §   | Other compensation, including very limited perquisites. |
|--------------------|---------------------------------------------------------|

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|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |    |   |                           |   |   |     |   |   | Grant    |   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------|--------|--------------------------------|--------|--------|----------|--------|--------|----------|--------|
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |    |   |                           |   |   |     |   |   |     |   |   | Exercise |   |   | Date Fair |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |    |   |                           |   |   | or Base  |   |   | Value of |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |    |   | Estimated Future Payouts Under |   |   | Price of |   |   | Unit and |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |    |   | Equity Incentive Plan Awards   |   |   | Option   |   |   | Option   |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | Grant   |   | Threshold                      |   |   | Target   |   |   | Maximum  |   |   | Awards |   |   | Awards |   |
| Name                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | Date    |   | (#)                            |   |   | (#)      |   |   | (#)      |   |   | ($/Unit) |   |   | ($) (1) |   |
| Restricted common unit awards: (2)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |    |   |                           |   |   |     |   |   |     |   |   |   |   |   |   |   |   |   |   |
|    W. Randall Fowler (CEO)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | 2/23/10 |   |                           | --     |   |     |   | 51,000 |     |   |   | -- |   |   |   | -- |   |   | $ | 164,577 |   |
|    Richard H. Bachmann (former CEO)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | 2/23/10 |   |                           | --     |   |     |   | 53,000 |     |   |   | -- |   |   |   | -- |   |   |   | 256,547 |   |
|    Bryan F. Bulawa (CFO)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 2/23/10 |   |                           | --     |   |     |   | 14,000 |     |   |   | -- |   |   |   | -- |   |   |   | 22,589 |   |
|    A. James Teague                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 2/23/10 |   |                           | --     |   |     |   | 53,000 |     |   |   | -- |   |   |   | -- |   |   |   | 427,578 |   |
|    William Ordemann                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | 2/23/10 |   |                           | --     |   |     |   | 33,800 |     |   |   | -- |   |   |   | -- |   |   |   | 218,145 |   |
|    Michael J. Knesek                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 2/23/10 |   |                           | --     |   |     |   | 12,500 |     |   |   | -- |   |   |   | -- |   |   |   | 60,506 |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |    |   |                           |   |   |     |   |   |     |   |   |   |   |   |   |   |   |   |   |   |   |
| Unit option awards: (2)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |    |   |                           |   |   |     |   |   |     |   |   |   |   |   |   |   |   |   |   |   |   |
|    W. Randall Fowler (CEO)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | 2/23/10 |   |                           | --     |   |     |   | 60,000 |     |   |   | -- |   |   | $ | 32.27 |   |   |   | 17,409 |   |
|    Richard H. Bachmann (former CEO)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | 2/23/10 |   |                           | --     |   |     |   | 60,000 |     |   |   | -- |   |   |   | 32.27 |   |   |   | 26,113 |   |
|    Bryan F. Bulawa (CFO)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 2/23/10 |   |                           | --     |   |     |   | 20,000 |     |   |   | -- |   |   |   | 32.27 |   |   |   | 2,901 |   |
|    A. James Teague                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 2/23/10 |   |                           | --     |   |     |   | 60,000 |     |   |   | -- |   |   |   | 32.27 |   |   |   | 43,522 |   |
|    William Ordemann                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | 2/23/10 |   |                           | --     |   |     |   | 60,000 |     |   |   | -- |   |   |   | 32.27 |   |   |   | 34,817 |   |
|    Michael J. Knesek                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 2/23/10 |   |                           | --     |   |     |   | 30,000 |     |   |   | -- |   |   |   | 32.27 |   |   |   | 13,057 |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |    |   |                           |   |   |     |   |   |     |   |   |   |   |   |   |   |   |   |   |   |   |
| (1)   Amounts presented reflect that portion of grant date fair value allocable to us based on the average percentage of time each named executive officer spent on our consolidated business activities during 2010. Based on current allocations, we estimate that the consolidated compensation expense we record for each named executive officer with respect to these awards (with the exception of awards granted to Mr. Bachmann who no longer dedicates any of his time to our affairs) will approximate these amounts over the vesting period.(2)   Awards granted to the named executive officers during 2010 were made under either the Amended and Restated 2008 Enterprise Products Long-Term Incentive Plan (“2008 Plan”) or the Enterprise Products 1998 Long-Term Incentive Plan (“1998 Plan”). |    |

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|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |        |   | Option Awards |   |   | Unit Awards   |   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------|--------|---------------|--------|--------|---------------|--------|
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |        |   | Number of     |   |   | Number of     |   |   |   |   |   |   |   |   |   |   |   | Market |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |        |   | Units         |   |   | Units         |   |   |   |   |   |   |   |   | Number |   |   | Value |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |        |   | Underlying    |   |   | Underlying    |   |   | Option |   |   |   |   |   | of Units |   |   | of Units |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |        |   | Options       |   |   | Options       |   |   | Exercise |   |   | Option |   |   | That Have |   |   | That Have |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Vesting     |   | Exercisable   |   |   | Unexercisable |   |   | Price |   |   | Expiration |   |   | Not Vested |   |   | Not Vested |   |
| Name                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | Date        |   | (#)           |   |   | (#)           |   |   | ($/Unit) |   |   | Date |   |   | (#) (2) |   |   | ($) (3) |   |
| Restricted common unit awards:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |        |   |          |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|    W. Randall Fowler (CEO)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | Various (1) |   | --            |   |   |          | --     |   |   |   | -- |   |   |   | -- |   |   |   | 130,100 |   |   | $ | 5,413,461 |   |
|    Richard H. Bachmann (former CEO)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | Various (1) |   | --            |   |   |          | --     |   |   |   | -- |   |   |   | -- |   |   |   | 145,000 |   |   |   | 6,033,450 |   |
|    Bryan F. Bulawa                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | Various (1) |   | --            |   |   |          | --     |   |   |   | -- |   |   |   | -- |   |   |   | 33,750 |   |   |   | 1,404,338 |   |
|    A. James Teague                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | Various (1) |   | --            |   |   |          | --     |   |   |   | -- |   |   |   | -- |   |   |   | 145,000 |   |   |   | 6,033,450 |   |
|    William Ordemann                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | Various (1) |   | --            |   |   |          | --     |   |   |   | -- |   |   |   | -- |   |   |   | 112,700 |   |   |   | 4,689,447 |   |
|    Michael J. Knesek                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | Various (1) |   | --            |   |   |          | --     |   |   |   | -- |   |   |   | -- |   |   |   | 41,600 |   |   |   | 1,730,976 |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |        |   |          |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Unit option awards:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |        |   |          |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|    W. Randall Fowler (CEO):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |        |   |          |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|        May 29, 2007 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 5/29/11     |   | --            |   |   |          | 45,000 |   |   | $ | 30.96 |   |   | 12/31/12 |   |   |   | -- |   |   |   | -- |   |
|        May 22, 2008 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 5/22/12     |   | --            |   |   |          | 60,000 |   |   |   | 30.93 |   |   | 12/31/13 |   |   |   | -- |   |   |   | -- |   |
|        February 19, 2009 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 2/19/13     |   |          | --     |   |          |   | 52,500 |   |   |   | 22.06 |   |   | 12/31/14 |   |   |   | -- |   |   |   | -- |   |
|        May 6, 2009 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 5/06/13     |   |          | --     |   |          |   | 60,000 |   |   |   | 24.92 |   |   | 12/31/14 |   |   |   | -- |   |   |   | -- |   |
|        February 23, 2010 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 2/23/14     |   |          | --     |   |          |   | 60,000 |   |   |   | 32.27 |   |   | 12/31/15 |   |   |   | -- |   |   |   | -- |   |
|    Richard H. Bachmann (former CEO):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |        |   |          |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|        May 29, 2007 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 5/29/11     |   |          | --     |   |          |   | 60,000 |   |   |   | 30.96 |   |   | 12/31/12 |   |   |   | -- |   |   |   | -- |   |
|        May 22, 2008 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 5/22/12     |   |          | --     |   |          |   | 60,000 |   |   |   | 30.93 |   |   | 12/31/13 |   |   |   | -- |   |   |   | -- |   |
|        February 19, 2009 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 2/19/13     |   |          | --     |   |          |   | 60,000 |   |   |   | 22.06 |   |   | 12/31/14 |   |   |   | -- |   |   |   | -- |   |
|        May 6, 2009 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 5/06/13     |   |          | --     |   |          |   | 60,000 |   |   |   | 24.92 |   |   | 12/31/14 |   |   |   | -- |   |   |   | -- |   |
|        February 23, 2010 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 2/23/14     |   |          | --     |   |          |   | 60,000 |   |   |   | 32.27 |   |   | 12/31/15 |   |   |   | -- |   |   |   | -- |   |
|   Bryan F. Bulawa:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |        |   |          |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|        February 23, 2010 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 2/23/14     |   |          | --     |   |          |   | 20,000 |   |   |   | 32.27 |   |   | 12/31/15 |   |   |   | -- |   |   |   | -- |   |
|   A. James Teague:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |        |   |          |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|        May 29, 2007 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 5/29/11     |   |          | --     |   |          |   | 60,000 |   |   |   | 30.96 |   |   | 12/31/12 |   |   |   | -- |   |   |   | -- |   |
|        May 22, 2008 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 5/22/12     |   |          | --     |   |          |   | 60,000 |   |   |   | 30.93 |   |   | 12/31/13 |   |   |   | -- |   |   |   | -- |   |
|        February 19, 2009 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 2/19/13     |   |          | --     |   |          |   | 60,000 |   |   |   | 22.06 |   |   | 12/31/14 |   |   |   | -- |   |   |   | -- |   |
|        May 6, 2009 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 5/06/13     |   |          | --     |   |          |   | 60,000 |   |   |   | 24.92 |   |   | 12/31/14 |   |   |   | -- |   |   |   | -- |   |
|        February 23, 2010 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 2/23/14     |   |          | --     |   |          |   | 60,000 |   |   |   | 32.27 |   |   | 12/31/15 |   |   |   | -- |   |   |   | -- |   |
|    William Ordemann:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |        |   |          |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|        May 29, 2007 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 5/29/11     |   |          | --     |   |          |   | 30,000 |   |   |   | 30.96 |   |   | 12/31/12 |   |   |   | -- |   |   |   | -- |   |
|        May 22, 2008 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 5/22/12     |   |          | --     |   |          |   | 60,000 |   |   |   | 30.93 |   |   | 12/31/13 |   |   |   | -- |   |   |   | -- |   |
|        February 19, 2009 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 2/19/13     |   |          | --     |   |          |   | 45,000 |   |   |   | 22.06 |   |   | 12/31/14 |   |   |   | -- |   |   |   | -- |   |
|        May 6, 2009 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 5/06/13     |   |          | --     |   |          |   | 60,000 |   |   |   | 24.92 |   |   | 12/31/14 |   |   |   | -- |   |   |   | -- |   |
|        February 23, 2010 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 2/23/14     |   |          | --     |   |          |   | 60,000 |   |   |   | 32.27 |   |   | 12/31/15 |   |   |   | -- |   |   |   | -- |   |
|    Michael J. Knesek:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |        |   |          |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|        May 29, 2007 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 5/29/11     |   |          | --     |   |          |   | 30,000 |   |   |   | 30.96 |   |   | 12/31/12 |   |   |   | -- |   |   |   | -- |   |
|        May 22, 2008 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 5/22/12     |   |          | --     |   |          |   | 30,000 |   |   |   | 30.93 |   |   | 12/31/13 |   |   |   | -- |   |   |   | -- |   |
|        February 19, 2009 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 2/19/13     |   |          | --     |   |          |   | 30,000 |   |   |   | 22.06 |   |   | 12/31/14 |   |   |   | -- |   |   |   | -- |   |
|        May 6, 2009 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 5/06/13     |   |          | --     |   |          |   | 30,000 |   |   |   | 24.92 |   |   | 12/31/14 |   |   |   | -- |   |   |   | -- |   |
|        February 23, 2010 option grant                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 2/23/14     |   |          | --     |   |          |   | 30,000 |   |   |   | 32.27 |   |   | 12/31/15 |   |   |   | -- |   |   |   | -- |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |        |   |          |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |        |   |          |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| (1)   Of the 608,150 restricted common unit awards presented in the table, 103,800 vest in 2011, 127,500 vest in 2012, 159,550 vest in 2013 and vest in 2014.(2)   Amounts represent the total number of restricted common unit awards granted to each named executive officer.(3)   Amounts derived by multiplying the total number of restricted common unit awards outstanding for each named executive officer by the closing price of Enterprise common units at December 31, 2010 of $41.61 per unit. |        |

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Table of Contents

|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   | Option Awards |   |   | Unit Awards |   |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|---------------|--------|--------|-------------|--------|
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   | Number of     |   |   | Gross       |   |   | Number of |   |   | Gross |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   | Units         |   |   | Value       |   |   | Units |   |   | Value |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   | Acquired on   |   |   | Realized on |   |   | Acquired on |   |   | Realized on |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   | Exercise      |   |   | Exercise    |   |   | Vesting |   |   | Vesting |   |
| Name                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   | (#)           |   |   | ($) (1)     |   |   | (#) |   |   | ($) (2,3) |   |
| W. Randall Fowler (CEO):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |   |          |   |   |        |   |   |   |   |   |   |   |   |   |
|    Option awards                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   |          | 65,000 |   |        | $      | 798,000 |   |   |   |   |   |   |   |   |
|    Restricted common unit awards                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   |          |   |   |        |   |   |   |   |   | 12,000 |   |   | $ | 427,320 |   |
|    Employee Partnerships: (3)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   |          |   |   |        |   |   |   |   |   |   |   |   |   |   |   |
|       Common units of Enterprise                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |   |          |   |   |        |   |   |   |   |   | 79,776 |   |   |   | 3,006,747 |   |
|       Units of Holdings                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |          |   |   |        |   |   |   |   |   | 179,116 |   |   |   | 9,099,173 |   |
| Richard H. Bachmann (former CEO):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |   |          |   |   |        |   |   |   |   |   |   |   |   |   |   |   |
|    Option awards                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   |          | 75,000 |   |        |   | 910,800 |   |   |   |   |   |   |   |   |   |
|    Restricted common unit awards                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   |          |   |   |        |   |   |   |   |   | 12,000 |   |   |   | 427,320 |   |
|    Employee Partnerships: (3)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   |          |   |   |        |   |   |   |   |   |   |   |   |   |   |   |
|       Common units of Enterprise                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |   |          |   |   |        |   |   |   |   |   | 83,318 |   |   |   | 3,140,244 |   |
|       Units of Holdings                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |          |   |   |        |   |   |   |   |   | 212,097 |   |   |   | 10,774,622 |   |
| Bryan F. Bulawa (CFO):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |   |          |   |   |        |   |   |   |   |   |   |   |   |   |   |   |
|    Employee Partnerships: (3)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   |          |   |   |        |   |   |   |   |   |   |   |   |   |   |   |
|       Common units of Enterprise                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |   |          |   |   |        |   |   |   |   |   | 1,771 |   |   |   | 66,749 |   |
|       Units of Holdings                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |          |   |   |        |   |   |   |   |   | 3,772 |   |   |   | 191,619 |   |
| A. James Teague:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |          |   |   |        |   |   |   |   |   |   |   |   |   |   |   |
|    Option awards                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   |          | 75,000 |   |        |   | 910,800 |   |   |   |   |   |   |   |   |   |
|    Restricted common unit awards                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   |          |   |   |        |   |   |   |   |   | 12,000 |   |   |   | 427,320 |   |
|    Employee Partnerships: (3)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   |          |   |   |        |   |   |   |   |   |   |   |   |   |   |   |
|       Common units of Enterprise                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |   |          |   |   |        |   |   |   |   |   | 83,318 |   |   |   | 3,140,244 |   |
|       Units of Holdings                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |          |   |   |        |   |   |   |   |   | 170,510 |   |   |   | 8,661,984 |   |
| William Ordemann:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |   |          |   |   |        |   |   |   |   |   |   |   |   |   |   |   |
|    Option awards                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   |          | 80,000 |   |        |   | 934,750 |   |   |   |   |   |   |   |   |   |
|    Restricted common unit awards                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   |          |   |   |        |   |   |   |   |   | 7,200 |   |   |   | 256,392 |   |
|    Employee Partnerships: (3)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   |          |   |   |        |   |   |   |   |   |   |   |   |   |   |   |
|       Common units of Enterprise                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |   |          |   |   |        |   |   |   |   |   | 14,165 |   |   |   | 533,877 |   |
|       Units of Holdings                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |          |   |   |        |   |   |   |   |   | 112,721 |   |   |   | 5,726,277 |   |
| Michael J. Knesek:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |          |   |   |        |   |   |   |   |   |   |   |   |   |   |   |
|    Option awards                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   |          | 45,000 |   |        |   | 547,950 |   |   |   |   |   |   |   |   |   |
|    Restricted common unit awards                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   |          |   |   |        |   |   |   |   |   | 7,200 |   |   |   | 256,392 |   |
|    Employee Partnerships: (3)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   |          |   |   |        |   |   |   |   |   |   |   |   |   |   |   |
|       Common units of Enterprise                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |   |          |   |   |        |   |   |   |   |   | 8,853 |   |   |   | 333,668 |   |
|       Units of Holdings                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |          |   |   |        |   |   |   |   |   | 85,253 |   |   |   | 4,330,891 |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |          |   |   |        |   |   |   |   |   |   |   |   |   |   |   |
| (1)   Amount determined by multiplying the number of units acquired on exercise of the options by the difference between the closing price of Enterprise’s common units on the date of exercise and the exercise price.(2)   Amount determined for restricted common unit awards by multiplying the number of restricted common unit awards that vested during 2010 by the closing price of Enterprise’s common units on the date of vesting.(3)   EPCO granted limited partnership interests in the Employee Partnerships to its key employees who perform services on behalf of us, EPCO and other affiliated companies. These partnerships were liquidated in August 2010 and the assets of each partnership (consisting of either common units of Enterprise or units of Holdings or a combination of both) were distributed to their partners, which included certain of our named executive officers. The gross value realized on vesting (i.e., liquidation in this case) was determined by multiplying the number of limited partner units received by the named executive officer by the closing price of Enterprise’s or Holdings’ limited partner units on the date of liquidation. |   |

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Table of Contents

|                                                                                                                                                                                                                                                      |   | Fees Earned |    |   |   |   |   |         |   |   |    |   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|-------------|---------|--------|--------|--------|--------|--------------|--------|--------|---------|--------|
|                                                                                                                                                                                                                                                      |   | or Paid     |    |   | Unit   |   |   | All Other    |   |   |    |   |
|                                                                                                                                                                                                                                                      |   | in Cash     |    |   | Awards |   |   | Compensation |   |   | Total   |   |
| Name                                                                                                                                                                                                                                                      |   | ($)         |    |   | ($)    |   |   | ($) (2)      |   |   | ($)     |   |
| William A. Bruckmann, III (1)                                                                                                                                                                                                                             |   | $           | 133,500 |   |   | $      | 40,000 |         |   | $      | 819,000 |   |   | $ | 992,500 |   |
| Larry J. Casey                                                                                                                                                                                                                                            |   |        | 118,500 |   |   |   | 40,000 |         |   |   | 819,000 |   |   |   | 977,500 |   |
| Joe D. Havens (3)                                                                                                                                                                                                                                         |   |        | 115,500 |   |   |   | 40,000 |         |   |   | 819,000 |   |   |   | 974,500 |   |
| Richard S. Snell                                                                                                                                                                                                                                          |   |        | 118,500 |   |   |   | 40,000 |         |   |   | --      |   |   |   | 158,500 |   |
|                                                                                                                                                                                                                                                      |   |        |    |   |   |   |   |         |   |   |    |   |   |   |   |   |
| (1)   Mr. Bruckmann serves as chairman of our ACG Committee.(2)   Amounts pertain to the settlement of unit appreciation rights in November 2010.(3)   Mr. Havens resigned as a director effective as of February 11, 2011. |   |

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| §   | Each independent director received a $75,000 annual cash retainer; |
|--------------------|--------------------------------------------------------------------|

| §   | If the individual served as chairman of a committee of the Board, then he received an additional $15,000 in cash annually; |
|--------------------|----------------------------------------------------------------------------------------------------------------------------|

| §   | Each independent director received a meeting fee of $1,500 in cash for each meeting of the Board attended.  In addition, each independent director received a meeting fee of $1,500 in cash for each meeting of a duly appointed committee of the Board attended, provided that he is duly elected or appointed to the committee; |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Each independent director received an annual grant of our common units having a fair market value, based on the closing price of our common units on the trading day immediately preceding the date of grant, of $40,000. |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

Item 12.

| Security Ownership of Certain Beneficial Owners |
|-------------------------------------------------|

|                                                                                                                                                                                                                                                                 |                              | Amount and     |     |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------|----------------|----------|
|                                                                                                                                                                                                                                                                 |                              | Nature of      |     |
| Title of                                                                                                                                                                                                                                                             | Name and Address                  | Beneficial     | Percent  |
| Class                                                                                                                                                                                                                                                                | of Beneficial Owner               | Ownership      | of Class |
| Common units                                                                                                                                                                                                                                                         | Randa Duncan Williams             | 34,425,140 (1) | 59.6%    |
|                                                                                                                                                                                                                                                                 | 1100 Louisiana Street, 10th Floor |           |     |
|                                                                                                                                                                                                                                                                 | Houston, Texas 77002              |           |     |
| (1)   For a detailed listing of ownership amounts that comprise Ms. Williams’ total beneficial ownership of our common units, see the table presented in the following section, “Security Ownership of Management,” within this Item 12. |

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|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Duncan Energy Partners L.P.Common Units |       | Enterprise ProductsPartners L.P.Common Units |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------|------------|----------------------------------------------|
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Amount and                              |       |                                         | Amount and |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Nature Of                               |       |                                         | Nature Of |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Beneficial                              | Percent of |                                         | Beneficial | Percent of |
| Name of Beneficial Owner                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | Ownership                               | Class      |                                         | Ownership | Class |
| Randa Duncan Williams:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |                                    |       |                                         |   |   |
|    Units controlled by Dan Duncan LLC Voting Trust:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |                                    |       |                                         |   |   |
|        Through DFI GP Holdings L.P.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | --                                      | --         |                                         | 40,844,206 | 4.8% |
|        Through Enterprise Products Holdings LLC                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | --                                      | --         |                                         | 20,881 | * |
|        Through EPO                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | 33,783,587                              | 58.5%      |                                         | -- | -- |
|    Units controlled by EPCO Voting Trust:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |                                    |       |                                         |   |   |
|        Through EPCO                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | --                                      | --         |                                         | 523,306 | * |
|        Through EPCO Investments, LLC                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | --                                      | --         |                                         | 15,241,517 | 1.8% |
|        Through Duncan Family Interests, Inc.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | --                                      | --         |                                         | 257,909,910 | 30.6% |
|        Through EPCO Holdings, Inc.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | 99,453                                  | *          |                                         | 7,739,181 | * |
|    Units controlled by estate of Dan L. Duncan (1)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | 485,600                                 | *          |                                         | 9,620,981 | 1.1% |
|    Units controlled by Alkek and Williams, Ltd.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | 50,000                                  | *          |                                         | 112,500 | * |
|    Units controlled by family trusts (2)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | --                                      | --         |                                         | 1,750,000 | * |
|    Units owned personally (3)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | 6,500                                   | *          |                                         | -- | -- |
|         Total for Randa Duncan Williams                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 34,425,140                              | 59.6%      |                                         | 333,762,482 | 39.6% |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                    |       |                                         |   |   |
| W. Randall Fowler (CEO) (4)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 2,000                                   | *          |                                         | 517,513 | * |
| Richard H. Bachmann (4)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | 19,486                                  | *          |                                         | 700,933 | * |
| Bryan F. Bulawa (CFO) (4)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 2,200                                   | *          |                                         | 42,728 | * |
| A. James Teague (4,5)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | 6,000                                   | *          |                                         | 689,069 | * |
| William Ordemann (4)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | 3,810                                   | *          |                                         | 354,891 | * |
| Michael J. Knesek (4,6)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | 2,340                                   | *          |                                         | 213,422 | * |
| Larry J. Casey                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | 14,050                                  | *          |                                         | 6,600 | * |
| William A. Bruckmann, III                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 9,764                                   | *          |                                         | 5,782 | * |
| Richard S. Snell                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 2,685                                   | *          |                                         | 4,077 | * |
| All current directors and executive officers    of our general partner (including all named    executive officers), as a group    (10 individuals in total) (7)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 34,487,475                              | 59.7%      |                                         | 336,297,497 | 39.9% |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                    |       |                                         |   |   |
| * Represents a beneficial ownership of less than 1% of class                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| (1)   The number of Duncan Energy Partners’ and Enterprise’s common units presented for the estate of Mr. Duncan includes common units of each registrant held of record by DD Securities LLC.(2)   The number of Enterprise’s common units presented for Ms. Williams includes 1,312,500 common units held by family trusts for which she is the trustee but has disclaimed beneficial ownership.(3)   The number of Duncan Energy Partners’ common units presented for Ms. Williams includes 4,500 common units held of record by her spouse and 2,000 common units held of record jointly with her spouse.(4)   These individuals are named executive officers.(5)   The number of Enterprise common units presented for Mr. Teague includes (i) 186,784 common units held by an immediate family member and (ii) 1,000 common units held by a family trust.(6)   The number of Enterprise’s common units presented for Mr. Knesek includes 3,245 common units held by a family member for which he has disclaimed beneficial ownership.(7)   Excludes 74,659 Duncan Energy Partners common units and 422,761 Enterprise common units beneficially owned by Joe D. Havens, who resigned as a director effective February 11, 2011. |

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| §   | each non-management director of our general partner is required to own our common units having an aggregate value (as defined in the guidelines) of three times the dollar amount of such non-management director’s aggregate annual cash retainer for service on the Board paid for the most recently completed calendar year; and |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | each executive officer of our general partner is required to own our common units having an aggregate value (as defined in the guidelines) of three times the dollar amount of such executive officer’s aggregate annual base salary for the most recently completed calendar year; provided, however, that the value of any common units of Enterprise owned by an executive officer of our general partner who is also an executive officer of the general partner of Enterprise, shall be counted toward the equity ownership requirements set forth above. |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|                                                                                                 |   |           |   |   |           |   |   | Number of        |   |
|------------------------------------------------------------------------------------------------------|--------|----------------|--------|--------|----------------|--------|--------|------------------|--------|
|                                                                                                 |   |           |   |   |           |   |   | Units            |   |
|                                                                                                 |   |           |   |   |           |   |   | Remaining        |   |
|                                                                                                 |   |           |   |   |           |   |   | Available For    |   |
|                                                                                                 |   | Number of      |   |   |           |   |   | Future Issuance  |   |
|                                                                                                 |   | Units to       |   |   | Weighted-      |   |   | Under Equity     |   |
|                                                                                                 |   | Be Issued      |   |   | Average        |   |   | Compensation     |   |
|                                                                                                 |   | Upon Exercise  |   |   | Exercise Price |   |   | Plans (excluding |   |
|                                                                                                 |   | of Outstanding |   |   | of Outstanding |   |   | securities       |   |
|                                                                                                 |   | Common Unit    |   |   | Common Unit    |   |   | reflected in     |   |
| Plan Category                                                                                        |   | Options        |   |   | Options        |   |   | column (a))      |   |
|                                                                                                 |   | (a)            |   |   | (b)            |   |   | (c)              |   |
| Equity compensation plans approved by unitholders:                                                   |   |           |   |   |           |   |   |             |   |
| 2010 Duncan Energy Partners L.P.   Long-Term Incentive Plan (“2010 Plan”) |   |           | --     |   |           |   | --     |             |   |   | 493,652 |   |
| Equity compensation plans not approved by unitholders:                                               |   |           |   |   |           |   |   |             |   |   |   |   |
| None                                                                                                 |   |           | --     |   |           |   | --     |             |   |   | -- |   |
| Total for equity compensation plans                                                                  |   |           | --     |   |           |   | --     |             |   |   | 493,652 |   |

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Item 13

| §   | for which Board approval is required by our management authorization policy, as such policy may be amended from time to time; |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------|

| §   | where an officer or director of the general partner or any of our subsidiaries is a party, without regard to the size of the transaction; |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------|

| §   | when requested to do so by management or the Board; or |
|--------------------|--------------------------------------------------------|

| §   | pursuant to our Partnership Agreement or the limited liability company agreement of the general partner, as such agreements may be amended from time to time. |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------|

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| §   | asset purchase or sale transactions; |
|--------------------|--------------------------------------|

| §   | capital expenditures; and |
|--------------------|---------------------------|

| §   | purchase orders and operating and administrative expenses not governed by the ASA. |
|--------------------|------------------------------------------------------------------------------------|

| §   | If a business opportunity to acquire “equity securities” (as defined below) is presented to the EPCO Group, or to Enterprise (including Enterprise GP) or Duncan Energy Partners (including DEP GP), then Enterprise will have the first right to pursue such opportunity.  The term “equity securities” is defined to include: |
|--------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | general partner interests (or securities which have characteristics similar to general partner interests) or interests in “persons” that own or control such general partner or similar interests (collectively, “GP Interests”) and securities convertible, exercisable, exchangeable or otherwise representing ownership or control of such GP Interests; and |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | incentive distribution rights (“IDRs”) and limited partner interests (or securities which have characteristics similar to IDRs or limited partner interests) in publicly traded partnerships or interests in “persons” that own or control such limited partner or similar interests (collectively, “non-GP Interests”); provided that such non-GP Interests are associated with GP Interests and are owned by the owners of GP Interests or their respective affiliates. |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|    | Enterprise will be presumed to want to acquire the equity securities until such time as Enterprise GP advises the EPCO Group and DEP GP that it has abandoned the pursuit of such business opportunity.  In the event that the purchase price of the equity securities is reasonably likely to equal or exceed $100 million, the decision to decline the acquisition will be made by the CEO of Enterprise GP after consultation with and subject to the approval of the ACG Committee of Enterprise GP.  If the purchase price is reasonably likely to be less than $100 million, the CEO of Enterprise GP may make the determination to decline the acquisition without consulting the ACG Committee of Enterprise GP. |
|--------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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|    | In its sole discretion, Enterprise may direct such acquisition opportunity to DEP GP for consideration; however, Enterprise is under no obligation to do so.  In the event this occurs, Duncan Energy Partners may pursue such acquisition. In the event Enterprise abandons the acquisition opportunity (and DEP GP is either not granted the opportunity by Enterprise or declines such opportunity outright), then the EPCO Group may pursue the acquisition without any further obligation to any other party or offer such opportunity to other affiliates. |
|--------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | If a business opportunity not involving “equity securities” (as defined above) is presented to the EPCO Group, or to Enterprise (including Enterprise GP), or Duncan Energy Partners (including DEP GP), Enterprise will have the first right to pursue such opportunity either for itself or, if desired by Enterprise in its sole discretion, for the benefit of Duncan Energy Partners.  It will be presumed that Enterprise will pursue the business opportunity until such time as its general partner advises the EPCO Group and DEP GP that it has abandoned the pursuit of such business opportunity. In the event the purchase price or cost associated with this type of business opportunity is reasonably likely to equal or exceed $100 million, any decision to decline the business opportunity will be made by the CEO of Enterprise GP after consultation with and subject to the approval of the ACG Committee of Enterprise GP.  If the purchase price or cost is reasonably likely to be less than $100 million, the CEO of Enterprise GP may make the determination to decline the business opportunity without consulting Enterprise GP’s ACG Committee.In its sole discretion, Enterprise may affirmatively direct such acquisition opportunity to DEP GP for consideration; however, Enterprise is under no obligation to do so.  In the event this occurs, Duncan Energy Partners may pursue such acquisition.In the event Enterprise abandons the acquisition opportunity (and DEP GP is either not granted the opportunity by Enterprise or declines such opportunity outright), then the EPCO Group may pursue the acquisition without any further obligation to any other party or offer such opportunity to other affiliates. |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | the relative interests of any party to such conflict, agreement, transaction or situation and the benefits and burdens relating to such interest; |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------|

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| §   | the totality of the relationships between the parties involved (including other transactions that may be particularly favorable or advantageous to us); |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | any customary or accepted industry practices and any customary or historical dealings with a particular person; |
|--------------------|-----------------------------------------------------------------------------------------------------------------|

| §   | any applicable generally accepted accounting or engineering practices or principles; |
|--------------------|--------------------------------------------------------------------------------------|

| §   | the relative cost of capital of the parties and the consequent rates of return to the equity holders of the parties; and |
|--------------------|--------------------------------------------------------------------------------------------------------------------------|

| §   | such additional factors as the ACG Committee determines in its sole discretion to be relevant, reasonable or appropriate under the circumstances. |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | assessing the business rationale for the transaction; |
|--------------------|-------------------------------------------------------|

| §   | reviewing the terms and conditions of the proposed transaction, including consideration and financing requirements, if any; |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------|

| §   | assessing the effect of the transaction on our earnings and distributable cash flow per unit, and on our results of operations, financial condition, properties or prospects; |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | conducting due diligence, including by interviews and discussions with management and other representatives and by reviewing transaction materials and findings of management and other representatives; |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | considering the relative advantages and disadvantages of the transactions to the parties; |
|--------------------|-------------------------------------------------------------------------------------------|

| §   | engaging third-party financial advisors to provide financial advice and assistance, including by providing fairness opinions if requested; |
|--------------------|--------------------------------------------------------------------------------------------------------------------------------------------|

| §   | engaging legal advisors; and |
|--------------------|------------------------------|

| §   | evaluating and negotiating the transaction and recommending for approval or approving the transaction, as the case may be. |
|--------------------|----------------------------------------------------------------------------------------------------------------------------|

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Item 14. 

|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   | For The Year Ended December 31, |   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|---------------------------------|--------|
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   | 2010                            |   |   | 2009 |   |
| Audit Fees (1)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   | $                               | 0.7    |   |   | $ | 0.9 |   |
| Audit-Related Fees (2)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |   |                            | N/A    |   |   |   | N/A |   |
| Tax Fees (3)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |   |                            | N/A    |   |   |   | N/A |   |
| All Other Fees (4)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |   |                            | N/A    |   |   |   | N/A |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   |                            |   |   |   |   |   |   |
| (1)   Audit fees represent amounts billed for each of the years presented for (i) the audit of our annual financial statements and internal controls over financial reporting, (ii) the review of our quarterly financial statements filed on Form 10-Q and (iii) those services normally provided by Deloitte & Touche in connection with our statutory and regulatory filings or engagements including comfort letters, consents and other services related to SEC matters. This information is presented as of the latest practicable date for this annual report.(2)   Audit-related fees represent amounts we were billed in each of the years presented for assurance and related services that are reasonably related to the performance of the annual audit or quarterly reviews and are not reported under the section labeled “Audit fees.” No such services were rendered by Deloitte & Touche during the last two years.(3)   Tax fees represent amounts we were billed in each of the years presented for professional services rendered in connection with tax compliance, tax advice and tax planning. No such services were rendered by Deloitte & Touche during the last two years.(4)   All other fees represent amounts we were billed in each of the years presented for services not classifiable under the other categories listed in the table above. No such services were rendered by Deloitte & Touche during the last two years. |   |

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PART IV

Item 15.

| (a)   | The following documents are filed as a part of this annual report: |
|-----------------|--------------------------------------------------------------------|

| (1)   | Financial Statements:  See Index to Consolidated Financial Statements on page F-1 of this annual report for financial statements filed as part of this annual report. |
|-----------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (2)   | Financial Statement Schedules:  All schedules have been omitted because they are either not applicable, not required or the information called for therein appears in the consolidated financial statements or notes thereto. |
|-----------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (3)   | Exhibits. |
|-----------------|-----------|

| Exhibit Number | Exhibit*                                                                                                                                                                                                                 |
|----------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 3.1            | Certificate of Limited Partnership of Duncan Energy Partners L.P. (incorporated by reference to Exhibit 3.1 to Form S-1 Registration Statement (Reg. No. 333-138371) filed November 2, 2006).                            |
| 3.2            | Amended and Restated Agreement of Limited Partnership of Duncan Energy Partners L.P., dated February 5, 2007 (incorporated by reference to Exhibit 3.1 to Form 8-K filed February 5, 2007).                         |
| 3.3            | Amendment No. 1 to the Amended and Restated Agreement of Limited Partnership of Duncan Energy Partners L.P. dated December 27, 2007 (incorporated by reference to Exhibit 3.1 to Form 8-K/A filed January 3, 2008). |
| 3.4            | Amendment No. 2 to the Amended and Restated Agreement of Limited Partnership of Duncan Energy Partners L.P. dated November 6, 2008 (incorporated by reference to Exhibit 3.4 to Form 10-Q filed November 10, 2008).      |
| 3.5            | Third Amendment to the Amended and Restated Agreement of Limited Partnership of Duncan Energy Partners L.P., dated December 8, 2008 (incorporated by reference to Exhibit 3.1 to Form 8-K filed December 8, 2008).       |
| 3.6            | Fourth Amendment to the Amended and Restated Agreement of Limited Partnership of Duncan Energy Partners L.P. dated June 15, 2009 (incorporated by reference to Exhibit 3.1 to Form 8-K filed June 15, 2009).             |
| 3.7            | Certificate of Formation of DEP Holdings, LLC (incorporated by reference to Exhibit 3.3 to Form S-1 Registration Statement (Reg. No. 333-138371) filed November 2, 2006).                                                |
| 3.8            | Second Amended and Restated Limited Liability Company Agreement of DEP Holdings, LLC, dated May 3, 2007 (incorporated by reference to Exhibit 3.4 to Form 10-Q filed May 4, 2007).                                       |
| 3.9            | First Amendment to the Second Amended and Restated Limited Liability Company Agreement of DEP Holdings, LLC dated November 6, 2008 (incorporated by reference to Exhibit 3.8 to Form 10-Q filed November 10, 2008).      |

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| 3.10     | Certificate of Formation of DEP OLPGP, LLC (incorporated by reference to Exhibit 3.5 to Form S-1 Registration Statement (Reg. No. 333-138371) filed November 2, 2006).                                                                                                                                                         |
|----------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 3.11     | Amended and Restated Limited Liability Company Agreement of DEP OLPGP, LLC, dated January 19, 2007 (incorporated by reference to Exhibit 3.6 to Amendment No. 3 to Form S-1 Registration Statement (Reg. No. 333-138371) filed January 22, 2007).                                                                              |
| 3.12     | Certificate of Limited Partnership of DEP Operating Partnership, L.P. (incorporated by reference to Exhibit 3.7 to Form S-1 Registration Statement (Reg. No. 333-138371) filed November 2, 2006).                                                                                                                              |
| 3.13     | Agreement of Limited Partnership of DEP Operating Partnership, L.P., dated September 29, 2006 (incorporated by reference to Exhibit 3.8 to Amendment No. 1 to Form S-1 Registration Statement (Reg. No. 333-138371) filed December 15, 2006).                                                                                  |
| 10.1***  | Amended and Restated 2008 Enterprise Products Long-Term Incentive Plan (February 23, 2010) (incorporated by reference to Exhibit 10.7 to Form 8-K filed by Enterprise Products Partners L.P. on February 26, 2010).                                                                                                  |
| 10.2***  | Form of Option Grant Award under the Amended and Restated 2008 Enterprise Products  Long-Term Incentive Plan for awards issued before February 23, 2010 (incorporated by reference to Exhibit 4.3 to Form S-8 filed by Enterprise Products Partners L.P. (Commission File No. 333-150680) on May 6, 2008). |
| 10.3***  | Amendment to Form of Option Grant Award under the Amended and Restated 2008 Enterprise Products Long-Term Incentive Plan for awards issued before February 23, 2010 (incorporated by reference to Exhibit 10.9 to Form 10-Q filed by Enterprise Products Partners L.P. on August 9, 2010).                                     |
| 10.4***  | Amendment to Form of Option Grant Award under the Amended and Restated 2008 Enterprise Products Long-Term Incentive Plan for awards issued after February 23, 2010 and before August 5, 2010 (incorporated by reference to Exhibit 10.10 to Form 10-Q filed by Enterprise Products Partners L.P. on August 9, 2010).           |
| 10.5***  | Form of Option Grant Award under the Amended and Restated 2008 Enterprise Products  Long-Term Incentive Plan (incorporated by reference to Exhibit 10.11 to Form 10-Q filed by Enterprise Products Partners L.P. on August 9, 2010).                                                                       |
| 10.6***  | Amendment to Form of Employee Restricted Unit Grant Award under the Amended and Restated 2008 Enterprise Products Long-Term Incentive Plan for awards issued before August 5, 2010 (incorporated by reference to Exhibit 10.12 to Form 10-Q filed by Enterprise Products Partners L.P. on August 9, 2010).                |
| 10.7***  | Form of Employee Restricted Unit Grant Award under the Amended and Restated 2008 Enterprise Products Long-Term Incentive Plan (incorporated by reference to Exhibit 10.13 to Form 10-Q filed by Enterprise Products Partners L.P. on August 9, 2010).                                                                     |
| 10.8***  | Form of Non-Employee Director Restricted Unit Grant Award under the Amended and Restated 2008 Enterprise Products Long-Term Incentive Plan (incorporated by reference to Exhibit 10.11 to Form 8-K filed by Enterprise Products Partners L.P. on February 26, 2010).                                                           |
| 10.9***  | Enterprise Products 1998 Long-Term Incentive Plan (Amended and Restated as of February 23, 2010) (incorporated by reference to Exhibit10.1 to Form 8-K filed by Enterprise Products Partners L.P. on February 26, 2010).                                                                                                       |
| 10.10*** | Form of Option Grant Award under the Enterprise Products 1998 Long-Term Incentive Plan for awards issued before May 7, 2008 (incorporated by reference to Exhibit 10.2 to Form 10-Q filed by Enterprise Products Partners L.P. on November 9, 2007).                                                                 |
| 10.11*** | Form of Option Grant Award under the Enterprise Products 1998 Long-Term Incentive Plan for awards issued on or after May 7, 2008 but before February 23, 2010 (incorporated by reference to Exhibit 10.4 to Form 10-Q filed by Enterprise Products Partners L.P. on May 12, 2008).                                   |
| 10.12*** | Amendment to Form of Option Grant Award under the Enterprise Products 1998 Long-Term Incentive Plan for awards issued before February 23, 2010 (incorporated by reference to Exhibit 10.1 to Form 10-Q filed by Enterprise Products Partners L.P. on August 9, 2010).                                                |
| 10.13*** | Amendment to Form of Option Grant Award under the Enterprise Products 1998 Long-Term Incentive Plan for awards issued after February 23, 2010 and before August 5, 2010 (incorporated by reference to Exhibit 10.2 to Form 10-Q filed by Enterprise Products Partners L.P. on August 9, 2010).                       |

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| 10.14*** | Form of Option Grant Award under the Enterprise Products 1998 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.3 to Form 10-Q filed by Enterprise Products Partners L.P. on August 9, 2010).                                                              |
|----------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 10.15*** | Form of Employee Restricted Unit Grant Award under the Enterprise Products 1998 Long-Term Incentive Plan for awards issued before February 23, 2010 (incorporated by reference to Exhibit 10.3 to Form 10-Q filed by Enterprise Products Partners L.P. on November 9, 2007).         |
| 10.16*** | Amendment to Form of Employee Restricted Unit Grant Award under the Enterprise Products 1998 Long-Term Incentive Plan for awards issued before August 5, 2010 (incorporated by reference to Exhibit 10.4 to Form 10-Q filed by Enterprise Products Partners L.P. on August 9, 2010). |
| 10.17*** | Form of Employee Restricted Unit Grant Award under the Enterprise Products 1998 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.5 to Form 10-Q filed by Enterprise Products Partners L.P. on August 9, 2010).                                                      |
| 10.18*** | Form of Non-Employee Director Restricted Unit Grant Award under the Enterprise Products 1998 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.6 to Form 8-K filed by Enterprise Products Partners L.P. on February 26, 2010).                                       |
| 10.19*** | 2010 Duncan Energy Partners L.P. Long-Term Incentive Plan (Amended and Restated as of February 23, 2010) (incorporated by reference to Exhibit 10.1 to Form 8-K filed February 26, 2010).                                                                                            |
| 10.20*** | Form of Option Grant Award under the 2010 Duncan Energy Partners L.P. Long-Term Incentive Plan (incorporated by reference to Exhibit 10.14 to Form 10-Q filed August 9, 2010).                                                                                                       |
| 10.21*** | Form of Employee Restricted Unit Grant Award under the 2010 Duncan Energy Partners L.P. Long-Term Incentive Plan (incorporated by reference to Exhibit 10.15 to Form 10-Q filed August 9, 2010).                                                                                     |
| 10.22*** | Form of Non-Employee Director Restricted Unit Grant Award under the 2010 Duncan Energy Partners L.P. Long-Term Incentive Plan (incorporated by reference to Exhibit 10.4 to Form 8-K filed February 26, 2010).                                                                       |
| 10.23*** | Agreement of Limited Partnership of Enterprise Unit L.P. dated February 20, 2008 (incorporated by reference to Exhibit 10.1 to Form 8-K filed by Enterprise Products Partners L.P. on February 26, 2008).                                                             |
| 10.24*** | First Amendment to Agreement of Limited Partnership of Enterprise Unit L.P. dated December 2, 2009 (incorporated by reference to Exhibit 10.4 to Form 8-K filed by Enterprise GP Holdings L.P. on December 8, 2009).                                             |
| 10.25*** | Agreement of Limited Partnership of EPCO Unit L.P. dated November 13, 2008 (incorporated by reference to Exhibit 10.5 to Form 8-K filed by Enterprise Products Partners L.P. on November 18, 2008).                                                                        |
| 10.26*** | First Amendment to Agreement of Limited Partnership of EPCO Unit L.P. dated December 2, 2009 (incorporated by reference to Exhibit 10.5 to Form 8-K filed by Enterprise GP Holdings L.P. on December 8, 2009).                                                   |
| 10.27*** | Agreement of Limited Partnership of EPE Unit L.P. dated August 23, 2005 (incorporated by reference to Exhibit 10.2 to Form 8-K filed by Enterprise GP Holdings L.P. on September 1, 2005).                                                                                           |
| 10.28*** | First Amendment to Agreement of Limited Partnership of EPE Unit L.P. dated August 7, 2007 (incorporated by reference to Exhibit 10.3 to Form 10-Q filed August 8, 2007).                                                                                                             |
| 10.29*** | Second Amendment to Agreement of Limited Partnership of EPE Unit L.P. dated July 1, 2008 (incorporated by reference to Exhibit 10.1 to Form 8-K filed by Enterprise GP Holdings L.P. on July 7, 2008).                                                                               |
| 10.30*** | Third Amendment to Agreement of Limited Partnership of EPE Unit L.P. dated December 2, 2009 (incorporated by reference to Exhibit 10.1 to Form 8-K filed by Enterprise GP Holdings L.P. on December 8, 2009).                                                    |
| 10.31*** | Agreement of Limited Partnership of EPE Unit II, L.P. dated December 5, 2006 (incorporated by reference to Exhibit 10.13 to Form 10-K filed by Enterprise Products Partners L.P. on February 28, 2007).                                                                              |
| 10.32*** | First Amendment to Agreement of Limited Partnership of EPE Unit II, L.P. dated August 7, 2007 (incorporated by reference to Exhibit 10.4 to Form 10-Q filed August 8, 2007).                                                                                                         |

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| 10.33*** | Second Amendment to Agreement of Limited Partnership of EPE Unit II, L.P. dated July 1, 2008 (incorporated by reference to Exhibit 10.2 to Form 8-K filed by Enterprise GP Holdings L.P. on July 7, 2008).                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|----------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 10.34*** | Third Amendment to Agreement of Limited Partnership of EPE Unit II, L.P. dated December 2, 2009 (incorporated by reference to Exhibit 10.2 to Form 8-K filed by Enterprise GP Holdings L.P. on December 8, 2009).                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| 10.35*** | Agreement of Limited Partnership of EPE Unit III, L.P. dated May 7, 2007 (incorporated by reference to Exhibit 10.6 to Form 8-K filed by Enterprise GP Holdings L.P. on May 10, 2007).                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| 10.36*** | First Amendment to Agreement of Limited Partnership of EPE Unit III, L.P. dated August 7, 2007 (incorporated by reference to Exhibit 10.5 to Form 10-Q filed August 8, 2007).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| 10.37*** | Second Amendment to Agreement of Limited Partnership of EPE Unit III, L.P. dated July 1, 2008 (incorporated by reference to Exhibit 10.3 to Form 8-K filed by Enterprise GP Holdings L.P. on July 7, 2008).                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| 10.38*** | Third Amendment to Agreement of Limited Partnership of EPE Unit III, L.P. dated December 2, 2009 (incorporated by reference to Exhibit 10.3 to Form 8-K filed by Enterprise GP Holdings L.P. on December 8, 2009).                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| 10.39    | Second Amended and Restated Limited Liability Company Agreement of Mont Belvieu Caverns, LLC dated November 1, 2008 (incorporated by reference to Exhibit 10.4 to Form 10-Q filed November 10, 2008).                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| 10.40    | Third Amended and Restated Agreement of Limited Partnership of Enterprise GC, L.P. dated December 8, 2008 (incorporated by reference to Exhibit 10.3 of Form 8-K filed December 8, 2008).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| 10.41    | Fourth Amended and Restated Agreement of Limited Partnership of Enterprise Intrastate L.P. dated December 8, 2008 (incorporated by reference to Exhibit 10.4 of Form 8-K filed December 8, 2008).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| 10.42    | Amended and Restated Company Agreement of Enterprise Texas Pipeline LLC dated December 8, 2008 (incorporated by reference to Exhibit 10.5 of Form 8-K filed December 8, 2008).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| 10.43    | Second Amended and Restated Limited Liability Company Agreement of Acadian Gas, LLC dated June 1, 2010 (incorporated by reference to Exhibit 10.01 of Form 8-K filed June 3, 2010).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| 10.44    | Amended and Restated Omnibus Agreement dated December 8, 2008 among Enterprise Products Operating LLC, DEP Holdings, LLC, Duncan Energy Partners L.P., DEP OLPGP, LLC, DEP Operating Partnership, L.P., Enterprise Lou-Tex Propylene Pipeline L.P., Sabine Propylene Pipeline L.P., Acadian Gas, LLC, Mont Belvieu Caverns, LLC, South Texas NGL Pipelines, LLC, Enterprise Holding III, LLC, Enterprise Texas Pipeline LLC, Enterprise Intrastate L.P. and Enterprise GC, LP (incorporated by reference to Exhibit 10.6 of Form 8-K filed December 8, 2008).                                                                                                                      |
| 10.45    | Fifth Amended and Restated Administrative Services Agreement dated January 30, 2009 by and among EPCO, Inc., Enterprise GP Holdings L.P., EPE Holdings, LLC, Enterprise Products Partners L.P., Enterprise Products Operating L.P., Enterprise Products GP, LLC, Enterprise Products OLPGP, Inc., DEP Holdings, LLC, Duncan Energy Partners L.P., DEP Operating Partnership, L.P., TEPPCO Partners, L.P., Texas Eastern Products Pipeline Company, LLC, TE Products Pipeline Company, LLC, TEPPCO Midstream Companies, LLC, TCTM, L.P. and TEPPCO GP, Inc. (incorporated by reference to Exhibit 10.1 to Form 8-K filed by Enterprise Products Partners L.P. on February 5, 2009). |
| 10.46    | Common Unit Purchase Agreement, dated June 15, 2009, by and among Enterprise Products Operating LLC and Enterprise GTM Holdings L.P. as Sellers and Duncan Energy Partners L.P. as Buyer (incorporated by reference to Exhibit 1.2 to Form 8-K filed June 18, 2009).                                                                                                                                                                                                                                                                                                                                                                                                               |
| 10.47    | Term Loan Agreement, dated as of April 18, 2008, among Duncan Energy Partners L.P., as Borrower, the Lenders Party Thereto, Wachovia Bank, National Association, as Administrative Agent, Suntrust Bank and The Bank of Nova Scotia, as Co-Syndication Agents, Mizuho Corporate Bank, Ltd. and The Royal Bank of Scotland plc, as Co-Documentation Agents, and Wachovia Capital Markets, LLC, SunTrust Robinson Humphrey, a division of SunTrust Capital Markets, Inc. and The Bank of Nova Scotia, as Joint Lead Arrangers and Joint Book Runners (incorporated by reference to Exhibit 10.7 of Form 8-K filed December 8, 2008).                                                 |

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| 10.48    | First Amendment to Term Loan Agreement, dated as of July 11, 2008, among Duncan Energy Partners L.P., as Borrower, the Lenders Party Thereto, Wachovia Bank, National Association, as Administrative Agent, Suntrust Bank and The Bank of Nova Scotia, as Co-Syndication Agents, Mizuho Corporate Bank, Ltd. and The Royal Bank of Scotland plc, as Co-Documentation Agents, and Wachovia Capital Markets, LLC, SunTrust Robinson Humphrey, a division of SunTrust Capital Markets, Inc. and The Bank of Nova Scotia, as Joint Lead Arrangers and Joint Book Runners (incorporated by reference to Exhibit 10.8 of Form 8-K filed December 8, 2008). |
|----------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 10.49    | Second Amendment to Term Loan Agreement, dated October 25, 2010, among Duncan Energy Partners L.P., as Borrower, Wells Fargo Bank, National Association, successor-by-merger to Wachovia Bank, National Association, as Administrative Agent, and the Lenders party thereto (incorporated by reference to Exhibit 10.01 to Form 8-K filed on October 26, 2010).                                                                                                                                                                                                                                                                                      |
| 10.50    | Loan Agreement, dated June 1, 2010, between Enterprise Products Operating LLC, as lender, and Duncan Energy Partners L.P., as borrower (incorporated by reference to Exhibit 10.02 to Form 8-K filed on June 3, 2010).                                                                                                                                                                                                                                                                                                                                                                                                                               |
| 10.51    | First Amendment to Loan Agreement, dated August 20, 2010, between Enterprise Products Operating LLC, as Lender, and Duncan Energy Partners L.P., as Borrower (incorporated by reference to Exhibit 10.1 to Form 8-K filed on August 23, 2010).                                                                                                                                                                                                                                                                                                                                                                                                       |
| 10.52    | Revolving Credit and Term Loan Agreement, dated October 25, 2010, among Duncan Energy Partners L.P., as Borrower, the Lenders party thereto, Wells Fargo Bank, National Association, as Administrative Agent, Citibank, N.A., DNB NOR Bank ASA and the Royal Bank of Scotland, plc, as Co-Syndication Agents, and Scotia Capital, Barclays Bank plc and Mizuho Corporate Bank, Ltd., as Co-Documentation Agents (incorporated by reference to Exhibit 10.2 to Form 8-K filed on October 26, 2010).                                                                                                                                                   |
| 10.53*** | Retention Agreement between William Ordemann and Enterprise Products Company dated effective October 1, 2010 (incorporated by reference to Exhibit 10.1 to Form 8-K filed by Enterprise Products Partners L.P. on October 14, 2010).                                                                                                                                                                                                                                                                                                                                                                                                                 |
| 10.54*** | Retention Agreement between W. Randall Fowler and Enterprise Products Company dated effective December 1, 2010 (incorporated by reference to Exhibit 10.2 to Form 8-K filed by Enterprise Products Partners L.P. on December 10, 2010).                                                                                                                                                                                                                                                                                                                                                                                                              |
| 10.55*** | Retention Agreement between A. James Teague and Enterprise Products Company dated effective December 1, 2010 (incorporated by reference to Exhibit 10.3 to Form 8-K filed by Enterprise Products Partners L.P. on December 10, 2010).                                                                                                                                                                                                                                                                                                                                                                                                                |
| 12.1#    | Computation of ratio of earnings to fixed charges for each of the five years ended December 31, 2010, 2009, 2008, 2007 and 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| 21.1#    | List of Subsidiaries as of February 1, 2011.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| 23.1#    | Consent of Deloitte & Touche LLP.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| 31.1#    | Sarbanes-Oxley Section 302 certification of W. Randall Fowler for Duncan Energy Partners L.P. for the December 31, 2010 Annual Report on Form 10-K.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| 31.2#    | Sarbanes-Oxley Section 302 certification of Bryan F. Bulawa for Duncan Energy Partners L.P. for the December 31, 2010 Annual Report on Form 10-K.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| 32.1#    | Section 1350 certification of W. Randall Fowler for the December 31, 2010 Annual Report on Form 10-K.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| 32.2#    | Section 1350 certification of Bryan F. Bulawa for the December 31, 2010 Annual Report on Form 10-K.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |

| *  *** #   | With respect to exhibits incorporated by reference to Exchange Act filings, the Commission file numbers for Duncan Energy Partners L.P., Enterprise Products Partners L.P. and Enterprise GP Holdings L.P. are 1-33266, 1-14323 and 1-32610, respectively. Identifies management contract and compensatory plan arrangements. Filed with this report. |
|-------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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SIGNATURES

|   |   |   |   |   | DUNCAN ENERGY PARTNERS L.P.      |
|--------|--------|--------|--------|--------|----------------------------------|
|   |   |   |   |   | (A Delaware Limited Partnership) |
|   |   |   |   |   |                             |
|   |   |   |   |   |                             |
|   |   |   |   |   | By:                              | DEP Holdings, LLC, as General Partner |
|   |   |   |   |   |                             |
|   |   |   |   |   |                             |
|   |   |   |   |   | By:                              |             /s/ Michael J. Knesek |      |
|   |   |   |   |   | Name:                            | Michael J. Knesek |
|   |   |   |   |   | Title:                           | Senior Vice President, Controllerand Principal Accounting Officerof the General Partner |

| Signature                                   |   | Title (Position with DEP Holdings, LLC)                                      |
|---------------------------------------------|--------|------------------------------------------------------------------------------|
| /s/ W. Randall Fowler                       |   |  Director, President and Chief Executive Officer                        |
|    W. Randall Fowler         |   |                                                                         |
| /s/ Bryan F. Bulawa                         |   |  Director, Senior Vice President, Treasurer and Chief Financial Officer |
|    Bryan F. Bulawa           |   |                                                                         |
| /s/ Larry J. Casey                          |   |  Director                                                               |
|    Larry J. Casey            |   |                                                                         |
| /s/ William A. Bruckmann, III               |   |  Director                                                               |
|    William A. Bruckmann, III |   |                                                                         |
| /s/ Richard S. Snell                        |   |  Director                                                               |
|     Richard S. Snell    |   |                                                                         |
| /s/ Michael J. Knesek                       |   |  Senior Vice President, Controller and Principal Accounting Officer     |
|    Michael J. Knesek         |   |                                                                         |

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Table of Contents

|                                                                                                           | Page No. |
|----------------------------------------------------------------------------------------------------------------|----------|
| Report of Independent Registered Public Accounting Firm                                                        | F-2      |
|                                                                                                           |     |
| Consolidated Balance Sheets as of December 31, 2010 and 2009                                                   | F-3      |
|                                                                                                           |     |
| Statements of Consolidated Operationsfor the Years Ended December 31, 2010,  2009 and 2008           | F-4      |
|                                                                                                           |     |
| Statements of Consolidated Comprehensive Incomefor the Years Ended December 31, 2010,  2009 and 2008 | F-5      |
|                                                                                                           |     |
| Statements of Consolidated Cash Flowsfor the Years Ended December 31, 2010,  2009 and 2008           | F-6      |
|                                                                                                           |     |
| Statements of Consolidated Equityfor the Years Ended December 31, 2010,  2009 and 2008               | F-7      |
|                                                                                                           |     |
| Notes to Consolidated Financial Statements:                                                                    |     |
| Note 1 – Partnership Operations and Basis of Presentation                                                | F-10     |
| Note 2 – Summary of Significant Accounting Policies                                                      | F-14     |
| Note 3 – Recent Accounting Developments                                                                  | F-20     |
| Note 4 – Revenue Recognition                                                                             | F-21     |
| Note 5 – Equity-based Awards                                                                             | F-22     |
| Note 6 – Derivative Instruments, Hedging Activities and Fair Value Measurements                          | F-28     |
| Note 7 – Inventories                                                                                     | F-32     |
| Note 8 – Property, Plant and Equipment                                                                   | F-33     |
| Note 9 – Investment in Evangeline                                                                        | F-34     |
| Note 10 – Intangible Assets and Goodwill                                                                 | F-36     |
| Note 11 – Debt Obligations                                                                               | F-37     |
| Note 12 – Equity and Distributions                                                                       | F-39     |
| Note 13 – Noncontrolling Interest                                                                        | F-42     |
| Note 14 – Business Segments                                                                              | F-46     |
| Note 15 – Related Party Transactions                                                                     | F-50     |
| Note 16 – Earnings Per Unit                                                                              | F-54     |
| Note 17 – Commitments and Contingencies                                                                  | F-55     |
| Note 18 – Significant Risks and Uncertainties                                                            | F-58     |
| Note 19 – Supplemental Cash Flow Information                                                             | F-59     |
| Note 20 – Quarterly Financial Information (Unaudited)                                                    | F-60     |
| Note 21 – Subsequent Events                                                                              | F-61     |

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GISTE

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Table of Contents

RTNERS

|                                                                                                                                             |   | December 31, |    |   | December 31, |   |
|--------------------------------------------------------------------------------------------------------------------------------------------------|--------|--------------|---------|--------|--------------|--------|
|                                                                                                                                             |   | 2010         |    |   | 2009         |   |
| ASSETS                                                                                                                                           |   |         |    |   |         |   |
| Current assets:                                                                                                                                  |   |         |    |   |         |   |
| Cash and cash equivalents                                                                                                                        |   | $            | 32.4    |   |         | $      | 3.9 |   |
| Accounts receivable – trade, net of allowance for doubtful accounts of $0.4and less than $0.1 at December 31, 2010 and 2009, respectively. |   |         | 66.0    |   |         |   | 77.7 |   |
| Accounts receivable – related parties                                                                                                      |   |         | 21.1    |   |         |   | 54.5 |   |
| Gas imbalance receivables                                                                                                                        |   |         | 11.5    |   |         |   | 9.8 |   |
| Inventories                                                                                                                                      |   |         | 5.8     |   |         |   | 10.5 |   |
| Prepaid and other current assets                                                                                                                 |   |         | 19.3    |   |         |   | 9.8 |   |
| Total current assets                                                                                                                             |   |         | 156.1   |   |         |   | 166.2 |   |
| Property, plant and equipment, net                                                                                                               |   |         | 5,362.2 |   |         |   | 4,549.6 |   |
| Investment in Evangeline                                                                                                                         |   |         | 6.4     |   |         |   | 5.6 |   |
| Intangible assets, net of accumulated amortization of $50.8 and $42.6 at December 31, 2010 and 2009, respectively.                          |   |         | 38.0    |   |         |   | 43.8 |   |
| Goodwill                                                                                                                                         |   |         | 4.9     |   |         |   | 4.9 |   |
| Other assets                                                                                                                                     |   |         | 4.3     |   |         |   | 0.7 |   |
| Total assets                                                                                                                                     |   | $            | 5,571.9 |   |         | $      | 4,770.8 |   |
|                                                                                                                                             |   |         |    |   |         |   |   |   |
| LIABILITIES AND EQUITY                                                                                                                           |   |         |    |   |         |   |   |   |
| Current liabilities:                                                                                                                             |   |         |    |   |         |   |   |   |
| Current Maturities of Long-Term Debt                                                                                                             |   | $            | 282.3   |   |         | $      | -- |   |
| Accounts payable – trade                                                                                                                   |   |         | 99.3    |   |         |   | 54.5 |   |
| Accounts payable – related parties                                                                                                         |   |         | 26.8    |   |         |   | 13.6 |   |
| Accrued product payables                                                                                                                         |   |         | 60.5    |   |         |   | 59.9 |   |
| Accrued taxes                                                                                                                                    |   |         | 30.7    |   |         |   | 17.5 |   |
| Other current liabilities                                                                                                                        |   |         | 28.0    |   |         |   | 18.9 |   |
| Total current liabilities                                                                                                                        |   |         | 527.6   |   |         |   | 164.4 |   |
| Long-term debt (see Note 11)                                                                                                                     |   |         | 506.0   |   |         |   | 457.3 |   |
| Deferred tax liabilities                                                                                                                         |   |         | 5.3     |   |         |   | 5.8 |   |
| Other long-term liabilities                                                                                                                      |   |         | 13.4    |   |         |   | 6.4 |   |
| Commitments and contingencies                                                                                                                    |   |         |    |   |         |   |   |   |
| Equity:                                                                                                                                          |   |         |    |   |         |   |   |   |
| Partners’ equity: (see Note 12)                                                                                                            |   |         |    |   |         |   |   |   |
| Limited partners:                                                                                                                                |   |         |    |   |         |   |   |   |
| Common units (57,749,158 and 57,676,987 common units outstanding at  December 31, 2010 and 2009, respectively)                         |   |         | 760.3   |   |         |   | 766.6 |   |
| General partner                                                                                                                                  |   |         | 0.1     |   |         |   | 0.2 |   |
| Accumulated other comprehensive loss                                                                                                             |   |         | --      |   |         |   | (5.4 | ) |
| Total partners’ equity                                                                                                                     |   |         | 760.4   |   |         |   | 761.4 |   |
| Noncontrolling interest in subsidiaries: (see Note 13)                                                                                           |   |         |    |   |         |   |   |   |
| DEP I Midstream Businesses – Parent                                                                                                        |   |         | 686.7   |   |         |   | 487.3 |   |
| DEP II Midstream Businesses – Parent                                                                                                       |   |         | 3,072.5 |   |         |   | 2,888.2 |   |
| Total noncontrolling interest                                                                                                                    |   |         | 3,759.2 |   |         |   | 3,375.5 |   |
| Total equity                                                                                                                                     |   |         | 4,519.6 |   |         |   | 4,136.9 |   |
| Total liabilities and equity                                                                                                                     |   | $            | 5,571.9 |   |         | $      | 4,770.8 |   |

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ENERGY PARTNERS 

|                                                                              |   | For Year Ended December 31, |    |
|-----------------------------------------------------------------------------------|--------|-----------------------------|---------|
|                                                                              |   | 2010                        |    |   | 2009 |   |   | 2008 |   |
| Revenues:                                                                         |   |                        |    |   |   |   |   |   |   |
| Third parties                                                                     |   | $                           | 537.3   |   |   | $ | 492.0 |   |   | $ | 856.4 |   |
| Related parties                                                                   |   |                        | 577.8   |   |   |   | 487.3 |   |   |   | 741.7 |   |
| Total revenues (see Note 14)                                                      |   |                        | 1,115.1 |   |   |   | 979.3 |   |   |   | 1,598.1 |   |
| Costs and Expenses:                                                               |   |                        |    |   |   |   |   |   |   |   |   |   |
| Operating costs and expenses:                                                     |   |                        |    |   |   |   |   |   |   |   |   |   |
| Third parties                                                                     |   |                        | 860.4   |   |   |   | 749.0 |   |   |   | 1,167.7 |   |
| Related parties                                                                   |   |                        | 170.0   |   |   |   | 159.3 |   |   |   | 345.1 |   |
| Total operating costs and expenses                                                |   |                        | 1,030.4 |   |   |   | 908.3 |   |   |   | 1,512.8 |   |
| General and administrative costs:                                                 |   |                        |    |   |   |   |   |   |   |   |   |   |
| Third parties                                                                     |   |                        | 2.5     |   |   |   | 0.3 |   |   |   | 3.4 |   |
| Related parties                                                                   |   |                        | 17.5    |   |   |   | 10.9 |   |   |   | 14.9 |   |
| Total general and administrative costs                                            |   |                        | 20.0    |   |   |   | 11.2 |   |   |   | 18.3 |   |
| Total costs and expenses (see Note 14)                                            |   |                        | 1,050.4 |   |   |   | 919.5 |   |   |   | 1,531.1 |   |
| Equity in income of Evangeline                                                    |   |                        | 0.8     |   |   |   | 1.1 |   |   |   | 0.9 |   |
| Operating income                                                                  |   |                        | 65.5    |   |   |   | 60.9 |   |   |   | 67.9 |   |
| Other income (expense)                                                            |   |                        |    |   |   |   |   |   |   |   |   |   |
| Interest expense                                                                  |   |                        | (12.1   | ) |   |   | (14.0 | ) |   |   | (12.0 | ) |
| Other, net                                                                        |   |                        | --      |   |   |   | 0.2 |   |   |   | 0.5 |   |
| Other expense, net                                                                |   |                        | (12.1   | ) |   |   | (13.8 | ) |   |   | (11.5 | ) |
| Income before provision for income taxes                                          |   |                        | 53.4    |   |   |   | 47.1 |   |   |   | 56.4 |   |
| Provision for income taxes                                                        |   |                        | --      |   |   |   | (1.3 | ) |   |   | (1.1 | ) |
| Net income                                                                        |   |                        | 53.4    |   |   |   | 45.8 |   |   |   | 55.3 |   |
| Net loss (income) attributable to noncontrolling interest: (see Note 13)          |   |                        |    |   |   |   |   |   |   |   |   |   |
| DEP I Midstream Businesses - Parent                                               |   |                        | (27.7   | ) |   |   | (15.3 | ) |   |   | (11.4 | ) |
| DEP II Midstream Businesses - Parent                                              |   |                        | 64.4    |   |   |   | 60.6 |   |   |   | 4.0 |   |
| Total net loss (income) attributable to noncontrolling interest                   |   |                        | 36.7    |   |   |   | 45.3 |   |   |   | (7.4 | ) |
| Net income attributable to Duncan Energy Partners L.P. (see Note 1)               |   | $                           | 90.1    |   |   | $ | 91.1 |   |   | $ | 47.9 |   |
|                                                                              |   |                        |    |   |   |   |   |   |   |   |   |   |
| Allocation of net income attributable toDuncan Energy Partners L.P.: (see Note 1) |   |                        |    |   |   |   |   |   |   |   |   |   |
| Limited partners’ interest in net income                                    |   | $                           | 89.5    |   |   | $ | 90.5 |   |   | $ | 27.8 |   |
| General partner interest in net income                                            |   | $                           | 0.6     |   |   | $ | 0.6 |   |   | $ | 0.5 |   |
| Former owners of DEP II Midstream Businesses                                      |   |                        |    |   |   |   |   |   |   | $ | 19.6 |   |
|                                                                              |   |                        |    |   |   |   |   |   |   |   |   |   |
| Basic and diluted earnings per unit (see Note 16)                                 |   | $                           | 1.55    |   |   | $ | 1.57 |   |   | $ | 1.22 |   |

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COMPREHENSIVE INCOME

|                                                                                                                             |   | For Year Ended December 31, |   |
|----------------------------------------------------------------------------------------------------------------------------------|--------|----------------------------------|--------|
|                                                                                                                             |   | 2010                             |   |   | 2009 |   |   | 2008 |   |
|                                                                                                                             |   |                             |   |   |   |   |   |   |   |
| Net income                                                                                                                       |   | $                                | 53.4   |   |   | $ | 45.8 |   |   | $ | 55.3 |   |
| Other comprehensive income (loss):                                                                                               |   |                             |   |   |   |   |   |   |   |   |   |   |
| Cash flow hedges:                                                                                                                |   |                             |   |   |   |   |   |   |   |   |   |   |
| Commodity derivative instrument losses during period                                                                             |   |                             | --     |   |   |   | -- |   |   |   | (0.7 | ) |
| Reclassification adjustment for losses included in net    income related to commodity derivative instruments |   |                             | --     |   |   |   | -- |   |   |   | 0.7 |   |
| Interest rate derivative instrument losses during period                                                                         |   |                             | (0.2   | ) |   |   | (2.5 | ) |   |   | (8.0 | ) |
| Reclassification adjustment for losses included in netincome related to interest rate derivative instruments                     |   |                             | 5.6    |   |   |   | 6.6 |   |   |   | 2.0 |   |
| Total other comprehensive income (loss)                                                                                          |   |                             | 5.4    |   |   |   | 4.1 |   |   |   | (6.0 | ) |
| Comprehensive income                                                                                                             |   |                             | 58.8   |   |   |   | 49.9 |   |   |   | 49.3 |   |
| Comprehensive loss (income) attributable to noncontrolling interest:                                                             |   |                             |   |   |   |   |   |   |   |   |   |   |
| DEP I Midstream Businesses – Parent                                                                                        |   |                             | (27.7  | ) |   |   | (15.3 | ) |   |   | (11.4 | ) |
| DEP II Midstream Businesses – Parent                                                                                       |   |                             | 64.4   |   |   |   | 60.6 |   |   |   | 4.0 |   |
| Total comprehensive loss (income) attributable to noncontrolling interest                                                        |   |                             | 36.7   |   |   |   | 45.3 |   |   |   | (7.4 | ) |
| Comprehensive income allocated to former owners of DEP II Midstream Businesses                                                   |   |                             | --     |   |   |   | -- |   |   |   | (19.6 | ) |
| Comprehensive income attributable to Duncan Energy Partners L.P.                                                                 |   | $                                | 95.5   |   |   | $ | 95.2 |   |   | $ | 22.3 |   |

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ENERGY PARTNERS 

|                                                                                         |   | For Year Ended December 31, |   |
|----------------------------------------------------------------------------------------------|--------|-----------------------------|--------|
|                                                                                         |   | 2010                        |   |   | 2009 |   |   | 2008 |   |
| Operating activities:                                                                        |   |                        |   |   |   |   |   |   |   |
| Net income                                                                                   |   | $                           | 53.4   |   |   | $ | 45.8 |   |   | $ | 55.3 |   |
| Adjustments to reconcile net income to net cash flows provided by operating activities: |   |                        |   |   |   |   |   |   |   |   |   |   |
| Depreciation, amortization and accretion                                                     |   |                        | 205.7  |   |   |   | 188.3 |   |   |   | 167.8 |   |
| Non-cash asset impairment charges                                                            |   |                        | 5.2    |   |   |   | 4.2 |   |   |   | -- |   |
| Equity in income of Evangeline                                                               |   |                        | (0.8   | ) |   |   | (1.1 | ) |   |   | (0.9 | ) |
| Losses (gains) from asset sales and related transactions                                     |   |                        | 7.9    |   |   |   | (0.5 | ) |   |   | (0.5 | ) |
| Deferred income tax expense                                                                  |   |                        | (0.5   | ) |   |   | -- |   |   |   | 0.3 |   |
| Changes in fair market value of derivative instruments                                       |   |                        | --     |   |   |   | (0.2 | ) |   |   | (0.1 | ) |
| Net effect of changes in operating accounts (see Note 19)                                    |   |                        | 39.5   |   |   |   | (34.9 | ) |   |   | (1.8 | ) |
| Cash flows provided by operating activities                                                  |   |                        | 310.4  |   |   |   | 201.6 |   |   |   | 220.1 |   |
| Investing activities:                                                                        |   |                        |   |   |   |   |   |   |   |   |   |   |
| Capital expenditures                                                                         |   |                        | (985.1 | ) |   |   | (389.1 | ) |   |   | (759.5 | ) |
| Contributions in aid of construction costs                                                   |   |                        | 9.9    |   |   |   | 5.7 |   |   |   | 9.9 |   |
| Proceeds from sale of assets and related transactions                                        |   |                        | 2.4    |   |   |   | 0.9 |   |   |   | 0.9 |   |
| Other, including loans to EPO (see Note 15)                                                  |   |                        | 45.5   |   |   |   | (46.3 | ) |   |   | (0.1 | ) |
| Cash used in investing activities                                                            |   |                        | (927.3 | ) |   |   | (428.8 | ) |   |   | (748.8 | ) |
| Financing activities:                                                                        |   |                        |   |   |   |   |   |   |   |   |   |   |
| Borrowings under bank agreements                                                             |   |                        | 422.1  |   |   |   | 76.2 |   |   |   | 398.9 |   |
| Repayments of debt under bank agreements                                                     |   |                        | (91.1  | ) |   |   | (103.2 | ) |   |   | (114.7 | ) |
| Borrowings under Loan Agreement with EPO (see Note 11)                                       |   |                        | 150.0  |   |   |   | -- |   |   |   | -- |   |
| Repayments of Loan Agreement with EPO                                                        |   |                        | (150.0 | ) |   |   | -- |   |   |   | -- |   |
| Debt issuance costs                                                                          |   |                        | (6.9   | ) |   |   | (0.4 | ) |   |   | (1.6 | ) |
| Cash distributions to our unitholders and general partner                                    |   |                        | (104.3 | ) |   |   | (88.9 | ) |   |   | (34.4 | ) |
| Cash distributions to EPO as noncontrolling interest                                         |   |                        | (93.7  | ) |   |   | (51.6 | ) |   |   | (318.1 | ) |
| Cash contributions from EPO as noncontrolling interest                                       |   |                        | 517.6  |   |   |   | 386.0 |   |   |   | 183.3 |   |
| Net cash proceeds from the issuance of common units                                          |   |                        | 1.7    |   |   |   | 137.4 |   |   |   | 0.5 |   |
| Repurchase of our common units from EPO (see Note 12)                                        |   |                        | --     |   |   |   | (137.4 | ) |   |   | -- |   |
| Net cash contributions from former owners of theDEP II Midstream Businesses                  |   |                        | --     |   |   |   | -- |   |   |   | 425.6 |   |
| Cash provided by financing activities                                                        |   |                        | 645.4  |   |   |   | 218.1 |   |   |   | 539.5 |   |
| Net changes in cash and cash equivalents                                                     |   |                        | 28.5   |   |   |   | (9.1 | ) |   |   | 10.8 |   |
| Cash and cash equivalents, January 1                                                         |   |                        | 3.9    |   |   |   | 13.0 |   |   |   | 2.2 |   |
| Cash and cash equivalents, December 31                                                       |   | $                           | 32.4   |   |   | $ | 3.9 |   |   | $ | 13.0 |   |

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ENERGY PARTNERS 

|                                                                                          |   |       |     |   |                   |    |   |    |   |    |          |   |   |           |   |   |   |    |
|-----------------------------------------------------------------------------------------------|--------|------------|----------|--------|------------------------|---------|--------|---------|--------|---------|---------------|--------|--------|----------------|--------|--------|--------|---------|
|                                                                                          |   |       |     |   |                   |    |   |    |   |    |          |   |   |           |   |   |   |    |
|                                                                                          |   | Former     |     |   | Duncan Energy Partners |    |   |    |   |    |          |   |
|                                                                                          |   | Owners     |     |   |                   |    |   |    |   |    | Accumulated   |   |   |           |   |   |   |    |
|                                                                                          |   | DEP II     |     |   |                   |    |   |    |   |    | Other         |   |   | Noncontrolling |   |   |   |    |
|                                                                                          |   | Midstream  |     |   | Limited                |    |   | General |   |    | Comprehensive |   |   | Interest in    |   |   |   |    |
|                                                                                          |   | Businesses |     |   | Partners               |    |   | Partner |   |    | Income (Loss) |   |   | Subsidiaries   |   |   | Total  |    |
| Balance, December 31, 2007                                                                    |   | $     | 2,880.1  |   |                   | $  | 317.7  |    |   | $  | 0.6           |   |   | $         | (3.6   | )      |   | $  | 355.2 |   |   | $  | 3,550.0 |   |
| Transactions prior to the DEP II drop down on December 8, 2008:                               |   |       |     |   |                   |    |   |    |   |    |          |   |   |           |   |   |   |    |   |   |   |   |   |   |
| Net income – January 1, 2008 through December 7, 2008                                   |   |       | 19.6     |   |                   |    | 21.1   |    |   |    | 0.4           |   |   |           | --     |   |   |    | 12.0 |   |   |   | 53.1 |   |
| Amortization of equity-based awards                                                           |   |       | --       |   |                   |    | 0.2    |    |   |    | --            |   |   |           | --     |   |   |    | -- |   |   |   | 0.2 |   |
| Cash contributions from former owner                                                          |   |       | 425.6    |   |                   |    | --     |    |   |    | --            |   |   |           | --     |   |   |    | -- |   |   |   | 425.6 |   |
| Cash contributions from EPO as noncontrolling interest                                        |   |       | --       |   |                   |    | --     |    |   |    | --            |   |   |           | --     |   |   |    | 161.6 |   |   |   | 161.6 |   |
| Cash distributions to EPO as noncontrolling interest                                          |   |       | --       |   |                   |    | --     |    |   |    | --            |   |   |           | --     |   |   |    | (37.3 | ) |   |   | (37.3 | ) |
| Cash distributions to our unitholders and general partner                                     |   |       | --       |   |                   |    | (33.7  | )       |   |    | (0.7          | )      |   |           | --     |   |   |    | -- |   |   |   | (34.4 | ) |
| Change in value of cash flow hedges                                                           |   |       | --       |   |                   |    | --     |    |   |    | --            |   |   |           | (0.3   | )      |   |    | -- |   |   |   | (0.3 | ) |
| Other                                                                                         |   |       | 0.2      |   |                   |    | --     |    |   |    | --            |   |   |           | --     |   |   |    | (12.5 | ) |   |   | (12.3 | ) |
| Balance, December 7, 2008                                                                     |   |       | 3,325.5  |   |                   |    | 305.3  |    |   |    | 0.3           |   |   |           | (3.9   | )      |   |    | 479.0 |   |   |   | 4,106.2 |   |
| Transactions in connection with the DEP II drop down on December 8, 2008:                     |   |       |     |   |                   |    |   |    |   |    |          |   |   |           |   |   |   |    |   |   |   |   |   |   |
| Retention by noncontrolling interest of ownership interests                                   |   |       | (2,595.5 | )      |                   |    | --     |    |   |    | --            |   |   |           | --     |   |   |    | 2,595.5 |   |   |   | -- |   |
| Allocation of equity in the DEP II Midstream Businesses   to Duncan Energy Partners |   |       | (730.0   | )      |                   |    | 730.0  |    |   |    | --            |   |   |           | --     |   |   |    | -- |   |   |   | -- |   |
| Cash distribution paid to EPO as noncontrolling interest  atDEP II drop down        |   |       | --       |   |                   |    | (280.5 | )       |   |    | --            |   |   |           | --     |   |   |    | -- |   |   |   | (280.5 | ) |
| Net cash proceeds from the issuance of common units                                           |   |       | --       |   |                   |    | 0.5    |    |   |    | --            |   |   |           | --     |   |   |    | -- |   |   |   | 0.5 |   |
| Balance, December 8, 2008                                                                     |   | $          | --       |   |                   |    | 755.3  |    |   |    | 0.3           |   |   |           | (3.9   | )      |   |    | 3,074.5 |   |   |   | 3,826.2 |   |
| Net income (loss) – December 8, 2008 throughDecember 31, 2008                           |   |       |     |   |                   |    | 6.7    |    |   |    | 0.1           |   |   |           | --     |   |   |    | (4.6 | ) |   |   | 2.2 |   |
| Cash contributions from EPO as noncontrolling interest                                        |   |       |     |   |                   |    | --     |    |   |    | --            |   |   |           | --     |   |   |    | 21.7 |   |   |   | 21.7 |   |
| Cash distributions to EPO as noncontrolling interest                                          |   |       |     |   |                   |    | --     |    |   |    | --            |   |   |           | --     |   |   |    | (0.3 | ) |   |   | (0.3 | ) |
| Change in value of cash flow hedges                                                           |   |       |     |   |                   |    | --     |    |   |    | --            |   |   |           | (5.7   | )      |   |    | -- |   |   |   | (5.7 | ) |
| Other                                                                                         |   |       |     |   |                   |    | --     |    |   |    | --            |   |   |           | --     |   |   |    | 0.1 |   |   |   | 0.1 |   |
| Balance, December 31, 2008                                                                    |   |       |     |   |                   |    | 762.0  |    |   |    | 0.4           |   |   |           | (9.6   | )      |   |    | 3,091.4 |   |   |   | 3,844.2 |   |
| Net income (loss)                                                                             |   |       |     |   |                   |    | 90.5   |    |   |    | 0.6           |   |   |           | --     |   |   |    | (45.3 | ) |   |   | 45.8 |   |
| Amortization of equity-based awards                                                           |   |       |     |   |                   |    | 2.2    |    |   |    | --            |   |   |           | --     |   |   |    | -- |   |   |   | 2.2 |   |
| Net cash proceeds from the issuance of common units                                           |   |       |     |   |                   |    | 137.4  |    |   |    | --            |   |   |           | --     |   |   |    | -- |   |   |   | 137.4 |   |
| Cash contributions from EPO as noncontrolling interest                                        |   |       |     |   |                   |    | --     |    |   |    | --            |   |   |           | --     |   |   |    | 386.0 |   |   |   | 386.0 |   |
| Cash distributions to EPO as noncontrolling interest                                          |   |       |     |   |                   |    | --     |    |   |    | --            |   |   |           | --     |   |   |    | (51.6 | ) |   |   | (51.6 | ) |
| Cash distributions to our unitholders and general partner                                     |   |       |     |   |                   |    | (88.1  | )       |   |    | (0.8          | )      |   |           | --     |   |   |    | -- |   |   |   | (88.9 | ) |
| Common units repurchased from EPO and retired (see Note 12)                                   |   |       |     |   |                   |    | (137.4 | )       |   |    | --            |   |   |           | --     |   |   |    | -- |   |   |   | (137.4 | ) |
| Change in value of cash flow hedges                                                           |   |       |     |   |                   |    | --     |    |   |    | --            |   |   |           | 4.2    |   |   |    | -- |   |   |   | 4.2 |   |
| Other                                                                                         |   |       |     |   |                   |    | --     |    |   |    | --            |   |   |           | --     |   |   |    | (5.0 | ) |   |   | (5.0 | ) |
| Balance, December 31, 2009                                                                    |   |       |     |   |                   |    | 766.6  |    |   |    | 0.2           |   |   |           | (5.4   | )      |   |    | 3,375.5 |   |   |   | 4,136.9 |   |
| Net income (loss)                                                                             |   |       |     |   |                   |    | 89.5   |    |   |    | 0.6           |   |   |           | --     |   |   |    | (36.7 | ) |   |   | 53.4 |   |
| Amortization of equity-based awards                                                           |   |       |     |   |                   |    | 5.9    |    |   |    | 0.1           |   |   |           | --     |   |   |    | -- |   |   |   | 6.0 |   |
| Net cash proceeds from the issuance of common units                                           |   |       |     |   |                   |    | 1.7    |    |   |    | --            |   |   |           | --     |   |   |    | -- |   |   |   | 1.7 |   |
| Cash contributions from EPO as noncontrolling interest                                        |   |       |     |   |                   |    | --     |    |   |    | --            |   |   |           | --     |   |   |    | 517.6 |   |   |   | 517.6 |   |
| Cash distributions to EPO as noncontrolling interest                                          |   |       |     |   |                   |    | --     |    |   |    | --            |   |   |           | --     |   |   |    | (93.7 | ) |   |   | (93.7 | ) |
| Cash distributions to our unitholders and general partner                                     |   |       |     |   |                   |    | (103.6 | )       |   |    | (0.7          | )      |   |           | --     |   |   |    | -- |   |   |   | (104.3 | ) |
| Change in value of cash flow hedges                                                           |   |       |     |   |                   |    | --     |    |   |    | --            |   |   |           | 5.4    |   |   |    | -- |   |   |   | 5.4 |   |
| Other                                                                                         |   |       |     |   |                   |    | 0.2    |    |   |    | (0.1          | )      |   |           | --     |   |   |    | (3.5 | ) |   |   | (3.4 | ) |
| Balance, December 31, 2010                                                                    |   |       |     |   |                   | $       | 760.3  |    |   | $       | 0.1           |   |   | $              | --     |   |   | $       | 3,759.2 |   |   | $ | 4,519.6 |   |

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Except per 

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Note 1

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| §   | Mont Belvieu Caverns owns 34 underground salt dome storage caverns located in Mont Belvieu, Texas, having an NGL and related product storage capacity of approximately 100 MMBbls, and a brine system with approximately 20 MMBbls of above ground storage capacity and related brine production wells. |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Acadian Gas is engaged in the gathering, transportation, storage and marketing of natural gas in south Louisiana, utilizing over 1,000 miles of pipelines having an aggregate throughput capacity of approximately 1.1 billion cubic feet per day (“Bcf/d”).  Acadian Gas also owns a 49.51% equity interest in Evangeline, which owns a 27-mile natural gas pipeline located in southeast Louisiana. |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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| §   | Lou-Tex Propylene owns a 267-mile pipeline used to transport chemical-grade propylene from Sorrento, Louisiana to Mont Belvieu, Texas. |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------|

| §   | Sabine Propylene owns a 21-mile pipeline used to transport polymer-grade propylene from Port Arthur, Texas to a pipeline interconnect in Cameron Parish, Louisiana. |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | South Texas NGL owns a 297-mile pipeline system used to transport NGLs from our Shoup and Armstrong NGL fractionation facilities in South Texas to Mont Belvieu, Texas. |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Enterprise GC operates and owns: (i) two NGL fractionation facilities, the Shoup and Armstrong facilities, located in South Texas; (ii) a 1,185-mile NGL pipeline system located in South Texas; and (iii) 1,096 miles of natural gas gathering pipelines located in South and West Texas.  Enterprise GC’s natural gas gathering pipelines include: (i) the 262-mile Big Thicket Gathering System located in southeast Texas; (ii) the 660-mile Waha system located in the Permian Basin of west Texas; and (iii) the 174-mile TPC Offshore gathering system located in South Texas. |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Enterprise Intrastate operates and owns an undivided 50% interest in the assets comprising the 641-mile Channel natural gas pipeline, which extends from the Agua Dulce Hub in South Texas to Sabine, Texas located on the Texas/Louisiana border. |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Enterprise Texas owns the 6,653-mile Enterprise Texas natural gas pipeline system, which includes the Sherman Extension and Trinity River Lateral pipelines, and leases the Wilson natural gas storage facility.  The Enterprise Texas pipeline system and the Wilson storage facility, along with the Waha, TPC Offshore and Channel pipeline systems, comprise our Texas Intrastate System. |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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| §   | Combined financial information of the DEP II Midstream Businesses from January 1, 2008 through December 7, 2008.  The results of operations and cash flows of the DEP II Midstream Businesses for this period are allocated to the former owners of these businesses that are under common control with Duncan Energy Partners. |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Consolidated financial information for Duncan Energy Partners for the twelve months ended December 31, 2008, including the results of operations and cash flows for the DEP II Midstream Businesses following completion of the DEP II drop down transaction.  On December 8, 2008, the DEP II Midstream Businesses became consolidated subsidiaries of Duncan Energy Partners.  EPO’s retained ownership in the DEP II Midstream Businesses (following the December 8, 2008 drop down transaction) is presented in our consolidated financial statements as “Noncontrolling interest in subsidiaries – DEP II Midstream Businesses – Parent.” |
|--------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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Note 2.  

|                           |   | For Year Ended December 31, |   |
|--------------------------------|--------|-----------------------------|--------|
|                           |   | 2010                        |   |   | 2009 |   |   | 2008 |   |
| Balance at beginning of period |   | $                           | *      |   |   | $ | * |   |   | $ | * |   |
| Charges to expense             |   |                        | 0.4    |   |   |   | -- |   |   |   | -- |   |
| Deductions                     |   |                        | *      |   |   |   | * |   |   |   | -- |   |
| Balance at end of period       |   | $                           | 0.4    |   |   | $ | * |   |   | $ | * |   |
|                           |   |                        |   |   |   |   |   |   |   |   |   |   |
| * Amounts are negligible.      |   |

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|                                                                                                                                                                                                                                                                                                                                                                                                                           |   | For Year Ended December 31, |   |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|-----------------------------|--------|
|                                                                                                                                                                                                                                                                                                                                                                                                                           |   | 2010                        |   |   | 2009 |   |   | 2008 |   |
| Balance at beginning of period                                                                                                                                                                                                                                                                                                                                                                                                 |   | $                           | 0.5    |   |   | $ | 0.6 |   |   | $ | 17.8 |   |
| Charges to expense                                                                                                                                                                                                                                                                                                                                                                                                             |   |                        | 0.3    |   |   |   | 0.1 |   |   |   | 0.3 |   |
| Charges to other accounts                                                                                                                                                                                                                                                                                                                                                                                                      |   |                        | 0.5    |   |   |   | -- |   |   |   | 0.2 |   |
| Adjustments (1)                                                                                                                                                                                                                                                                                                                                                                                                                |   |                        | (0.3   | ) |   |   | (0.2 | ) |   |   | (17.7 | ) |
| Balance at end of period                                                                                                                                                                                                                                                                                                                                                                                                       |   | $                           | 1.0    |   |   | $ | 0.5 |   |   | $ | 0.6 |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                           |   |                        |   |   |   |   |   |   |   |   |   |   |
| (1)   The $17.7 million deduction in 2008 in the reserve balance is partially comprised of a $5.0 million reduction in the reserve based on revised estimates of future remediation costs and a remaining $6.3 million reserve retained by EPO in connection with the DEP II drop down transaction. In addition, we spent approximately $5.4 million for the remediation of mercury site contamination in 2008. |   |

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|                                  |   | December 31, 2010 |   |   | December 31, 2009 |   |
|---------------------------------------|--------|-------------------|--------|--------|-------------------|--------|
|                                  |   | Carrying          |   |   | Fair              |   |   | Carrying |   |   | Fair |   |
| Financial Instruments                 |   | Value             |   |   | Value             |   |   | Value |   |   | Value |   |
| Financial assets:                     |   |              |   |   |              |   |   |   |   |   |   |   |
| Cash and cash equivalents             |   | $                 | 32.4   |   |              | $      | 32.4 |   |   | $ | 3.9 |   |   | $ | 3.9 |   |
| Accounts receivable                   |   |              | 98.6   |   |              |   | 98.6 |   |   |   | 142.0 |   |   |   | 142.0 |   |
| Financial liabilities:                |   |              |   |   |              |   |   |   |   |   |   |   |   |   |   |   |
| Accounts payable and accrued expenses |   | $                 | 217.3  |   |              | $      | 217.3 |   |   | $ | 145.5 |   |   | $ | 145.5 |   |
| Other current liabilities             |   |              | 27.8   |   |              |   | 27.8 |   |   |   | 13.3 |   |   |   | 13.3 |   |
| Variable-rate debt                    |   |              | 788.3  |   |              |   | 788.3 |   |   |   | 457.3 |   |   |   | 457.3 |   |

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|                                                                                                                   |   | December 31, |   |
|------------------------------------------------------------------------------------------------------------------------|--------|--------------|--------|
|                                                                                                                   |   | 2010         |   |   | 2009 |   |
| Natural gas imbalance receivables                                                                                      |   | $            | 11.5   |   |   | $ | 9.8 |   |
| Natural gas imbalance payables (1)                                                                                     |   |         | 10.6   |   |   |   | 11.0 |   |
| (1)   Reflected as a component of “Accrued product payables” on our Consolidated Balance Sheets. |   |

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No

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Note 5.

|                          |   | For Year Ended December 31, |   |
|-------------------------------|--------|-----------------------------|--------|
|                          |   | 2010                        |   |   | 2009 |   |   | 2008 |   |
| Restricted common unit awards |   | $                           | 3.6    |   |   | $ | 1.4 |   |   | $ | 0.7 |   |
| Unit option awards            |   |                        | 0.3    |   |   |   | 0.2 |   |   |   | -- |   |
| Employee Partnerships         |   |                        | 3.1    |   |   |   | 0.6 |   |   |   | 0.2 |   |
| Total compensation expense    |   | $                           | 7.0    |   |   | $ | 2.2 |   |   | $ | 0.9 |   |

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|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |      |      |   | Weighted-       |   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|-----------|-----------|--------|-----------------|--------|
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |      |      |   | Average Grant   |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   | Number of |      |   | Date Fair Value |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   | Units     |      |   | per Unit (1)    |   |
| Enterprise Products Partners L.P. restricted common unit awards                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |      |      |   |            |   |
| Restricted common units at December 31, 2007                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |   |      | 1,688,540 |   |            | $      | 27.23 |   |
| Granted (2)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   |      | 766,200   |   |            | $      | 30.73 |   |
| Vested                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |   |      | (285,363  | )      |            | $      | 23.11 |   |
| Forfeited                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |      | (88,777   | )      |            | $      | 26.98 |   |
| Restricted common units at December 31, 2008                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |   |      | 2,080,600 |   |            | $      | 29.09 |   |
| Granted (3)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   |      | 1,025,650 |   |            | $      | 24.89 |   |
| Vested                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |   |      | (281,500  | )      |            | $      | 26.70 |   |
| Forfeited                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |      | (411,884  | )      |            | $      | 28.37 |   |
| Awards assumed in connection with TEPPCO Merger                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |      | 308,016   |   |            | $      | 27.64 |   |
| Restricted common units at December 31, 2009                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |   |      | 2,720,882 |   |            | $      | 27.70 |   |
| Granted (4,5)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |   |      | 1,393,925 |   |            | $      | 32.60 |   |
| Vested (5)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |   |      | (383,628  | )      |            | $      | 25.51 |   |
| Forfeited                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |      | (169,565  | )      |            | $      | 29.87 |   |
| Restricted common units at December 31, 2010                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |   |      | 3,561,614 |   |            | $      | 29.78 |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |      |      |   |            |   |   |   |
| Duncan Energy Partners L.P. restricted common unit awards                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |      |      |   |            |   |   |   |
| Restricted common units at December 31, 2009                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |   |      | --        |   |            |   |   |   |
| Granted (5,6)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |   |      | 6,348     |   |            | $      | 25.26 |   |
| Vested (5)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |   |      | (6,348    | )      |            | $      | 25.26 |   |
| Restricted common units at December 31, 2010                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |   |      | --        |   |            |   |   |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |      |      |   |            |   |   |   |
| (1)   Determined by dividing the aggregate grant date fair value of awards before an allowance for forfeitures by the number of awards issued. With respect to restricted common unit awards assumed in connection with the TEPPCO Merger, the weighted-average grant date fair value per unit was determined by dividing the aggregate grant date fair value of the assumed awards before an allowance for forfeitures by the number of awards assumed.(2)   Aggregate grant date fair value of restricted common unit awards issued during 2008 was $23.5 million based on grant date market prices of Enterprise’s common units ranging from $25.00 to $32.31 per unit. An estimated forfeiture rate of 17% was applied to these awards.(3)   Aggregate grant date fair value of restricted common unit awards issued during 2009 was $25.5 million based on grant date market prices of Enterprise’s common units ranging from $20.08 to $28.73 per unit. Estimated forfeiture rates ranging between 4.6% and 17% were applied to these awards.(4)   Aggregate grant date fair value of restricted common unit awards issued during 2010 was $45.4 million based on grant date market prices of Enterprise’s common units ranging from $32.00 to $43.18 per unit. Estimated forfeiture rates ranging between 4.6% and 17% were applied to these awards.(5)   Includes awards granted to the independent directors of the boards of directors of EPGP and DEP GP as part of their annual compensation in for 2010. A total of 6,960 and 6,348 restricted common unit awards were issued in February 2010 to the independent directors of EPGP and DEP GP, respectively, that immediately vested upon issuance.(6)   Aggregate grant date fair value of restricted common unit awards denominated in our common units issued during 2010 was $0.2 million based on a grant date market price of our common units of $25.26 per unit. |   |

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|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   |      |      |   |           |   |   | Weighted-       |   |   |      |   |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|-----------|-----------|--------|----------------|--------|--------|-----------------|--------|--------|-----------|--------|
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   |      |      |   | Weighted-      |   |   | Average         |   |   |      |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   |      |      |   | Average        |   |   | Remaining       |   |   | Aggregate |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   | Number of |      |   | Strike Price   |   |   | Contractual     |   |   | Intrinsic |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   | Units     |      |   | (dollars/unit) |   |   | Term (in years) |   |   | Value (1) |   |
| Unit options at December 31, 2007                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |      | 2,315,000 |   |           | $      | 26.18  |            |   |   |      |   |   |   |
| Granted (2)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |   |      | 795,000   |   |           | $      | 30.93  |            |   |   |      |   |   |   |
| Exercised                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |   |      | (61,500   | )      |           | $      | 20.38  |            |   |   |      |   |   |   |
| Forfeited                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |   |      | (85,000   | )      |           | $      | 26.72  |            |   |   |      |   |   |   |
| Unit options at December 31, 2008                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |      | 2,963,500 |   |           | $      | 27.56  |            |   |   |      |   |   |   |
| Granted (3)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |   |      | 1,460,000 |   |           | $      | 23.46  |            |   |   |      |   |   |   |
| Exercised                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |   |      | (261,000  | )      |           | $      | 19.61  |            |   |   |      |   |   |   |
| Forfeited                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |   |      | (930,540  | )      |           | $      | 26.69  |            |   |   |      |   |   |   |
| Awards assumed in connection with TEPPCO Merger                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |   |      | 593,960   |   |           | $      | 26.12  |            |   |   |      |   |   |   |
| Unit options at December 31, 2009                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |      | 3,825,920 |   |           | $      | 26.52  |            |   |   |      |   |   |   |
| Granted (4)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |   |      | 785,000   |   |           | $      | 32.26  |            |   |   |      |   |   |   |
| Exercised                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |   |      | (857,500  | )      |           | $      | 24.98  |            |   |   |      |   |   |   |
| Unit options at December 31, 2010 (5)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |   |      | 3,753,420 |   |           | $      | 28.08  |            |   |   | 3.6       |   |   |   | -- |   |
| Unit options exercisable at:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |      |      |   |           |   |   |            |   |   |      |   |   |   |   |   |
| December 31, 2008                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |      | 548,500   |   |           | $      | 21.47  |            |   |   | 4.1       |   |   | $ | -- |   |
| December 31, 2009                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |      | 447,500   |   |           | $      | 25.09  |            |   |   | 4.8       |   |   | $ | 2.8 |   |
| December 31, 2010 (5)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |   |      | --        |   |           |   | --     |            |   |   | --        |   |   |   | -- |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   |      |      |   |           |   |   |            |   |   |      |   |   |   |   |   |
| (1)   Aggregate intrinsic value reflects fully vested unit options at the date indicated.(2)   Aggregate grant date fair value of these unit options issued during 2008 was $1.9 million based on the following assumptions: (i) a grant date market price of Enterprise’s common units of $30.93 per unit; (ii) expected life of options of 4.7 years; (iii) a risk-free interest rate of 3.3%; (iv) an expected distribution yield on Enterprise’s common units of 7.0%; and (v) an expected unit price volatility on Enterprise’s common units of 19.8%. An estimated forfeiture rate of 17.0% was applied to awards granted during 2008.(3)   Aggregate grant date fair value of these unit options issued during 2009 was $8.1 million based on the following assumptions: (i) a weighted-average grant date market price of Enterprise’s common units of $23.46 per unit; (ii) weighted-average expected life of options of 4.8 years; (iii) weighted-average risk-free interest rate of 2.1%; (iv) weighted-average expected distribution yield on Enterprise’s common units of 9.4%; and (v) weighted-average expected unit price volatility on Enterprise’s common units of 57.4%. An estimated forfeiture rate of 17.0% was applied to awards granted during 2009.(4)   Aggregate grant date fair value of these unit options issued during 2010 was $2.3 million based on the following assumptions: (i) a weighted-average grant date market price of Enterprise’s common units of $32.26 per unit; (ii) weighted-average expected life of options of 4.9 years; (iii) weighted-average risk-free interest rate of 2.5%; (iv) weighted-average expected distribution yield on Enterprise’s common units of 6.9%; and (v) weighted-average expected unit price volatility on Enterprise’s common units of 23.3%. An estimated forfeiture rate of 17.0% was applied to awards granted during 2010.(5)   Enterprise was committed to issue 3,753,420 and 3,825,920 of Enterprise’s common units at December 31, 2010 and 2009, respectively, if all outstanding options awarded (as of these dates) were exercised. Of the option awards outstanding at December 31, 2010, 712,280, 736,000, 1,520,140 and 785,000 will vest in 2011, 2012, 2013 and 2014, respectively.  These unit option awards become exercisable in the calendar year following the year in which they vest. |   |

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|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   | For Year Ended December 31, |   |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|-----------------------------|--------|
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   | 2010                        |   |   | 2009 |   |   | 2008 |   |
| Aggregate grant date fair values at beginning of period                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   | $                           | 79.3   |   |   | $ | 64.6 |   |   | $ | 35.4 |   |
| Grant of limited partner interests (1)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |                        | --     |   |   |   | -- |   |   |   | 14.6 |   |
| Modifications (2)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   |                        | --     |   |   |   | 19.5 |   |   |   | 15.0 |   |
| Other, including forfeiture and regrant activity (3,4)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |                        | (28.0  | ) |   |   | (4.8 | ) |   |   | (0.4 | ) |
| Liquidation of partnerships                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |                        | (51.3  | ) |   |   | -- |   |   |   | -- |   |
| Aggregate grant date fair values at end of period                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   | $                           | --     |   |   | $ | 79.3 |   |   | $ | 64.6 |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |                        |   |   |   |   |   |   |   |   |   |   |
| (1)   EPCO Unit, Enterprise Unit, TEPPCO Unit L.P. (“TEPPCO Unit”) and TEPPCO Unit II L.P. (“TEPPCO Unit II”) were formed in 2008.(2)   In December 2009, the expected liquidation date for each Employee Partnership was extended to February 2016. This modification followed a similar set of modifications made in July 2008 for EPE Unit I, EPE Unit II and EPE Unit III that extended liquidation dates as well as reduced the Class A limited partner’s preferred return rates. These modifications were intended to align the interests of the Class B partners with the long-term interests of EPCO and other unitholders in the relevant underlying publicly traded partnerships.(3)   Amount presented for 2009 primarily reflects adjustments due to the dissolution of TEPPCO Unit and TEPPCO Unit II.(4)   Amount presented for 2010 reflects the decrease in fair value attributable to changes in the service period from February 2016 to August 2010 (the liquidation date) for all of the Employee Partnerships. The reduction is attributable to the cash distributions that the Class B limited partners would not receive from each Employee Partnership as a result of the August 2010 liquidations. |   |

| EmployeePartnership | ExpectedLife ofAward | Risk-Free InterestRate | ExpectedDistribution Yield | Expected Unit Price Volatility |
|---------------------|----------------------|------------------------|----------------------------|--------------------------------|
| EPE Unit I          | 3 to 6 years         | 1.2% to 5.0%           | 3.0% to 6.7%               | 16.6% to 35.0%                 |
| EPE Unit II         | 4 to 6 years         | 1.6% to 4.4%           | 3.8% to 6.4%               | 18.7% to 31.7%                 |
| EPE Unit III        | 4 to 6 years         | 1.4% to 4.9%           | 4.0% to 6.4%               | 16.6% to 32.2%                 |
| Enterprise Unit     | 4 to 6 years         | 1.4% to 3.9%           | 4.5% to 8.4%               | 15.3% to 31.7%                 |
| EPCO Unit           | 4 to 6 years         | 1.6% to 2.4%           | 8.1% to 11.1%              | 27.0% to 50.0%                 |

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Note 6

| §   | Changes in the fair value of a recognized asset or liability, or an unrecognized firm commitment - In a fair value hedge, gains and losses for both the derivative instrument and the hedged item are recognized in income during the period of change. |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Variable cash flows of a forecasted transaction - In a cash flow hedge, the effective portion of the hedge is reported in other comprehensive income (loss) and is reclassified into earnings when the forecasted transaction affects earnings. |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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|                                                                                                                                                                                                                      | Volume (1) | Accounting |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------|------------|
| Derivative Purpose                                                                                                                                                                                                        | Current    | Long-Term  | Treatment |
|                                                                                                                                                                                                                      |       |       |   |
| Derivatives not designated as hedging instruments:                                                                                                                                                                        |       |       |   |
|    Acadian Gas:                                                                                                                                                                                            |       |       |   |
|       Natural gas risk management activities (2)                                                                                                                                            | 2.8 Bcf    | n/a        | Mark-to-market |
|                                                                                                                                                                                                                      |       |       |   |
| (1)   This reflects the absolute value of derivative notional volumes.(2)   Reflects the use of derivative instruments to manage risks associated with natural gas transportation and storage assets. |

|                                               | Asset Derivatives         |   | Liability Derivatives |   |
|----------------------------------------------------|---------------------------|--------|-----------------------|--------|
|                                               | December 31, 2010         |   | December 31, 2009     |   | December 31, 2010 |   | December 31, 2009 |   |
|                                               | Balance SheetLocation     |   | FairValue             |   | Balance SheetLocation |   | FairValue |   | Balance SheetLocation |   | FairValue |   | Balance SheetLocation |   | FairValue |   |
|                                               |
|                                               |                      |
| Derivatives designated as hedging instruments:     |                      |
| Interest rate derivatives                          | Other current assets |   | $                     | --     |   | Other current assets |   | $ | -- |   | Other currentliabilities |   | $ | -- |   | Other currentliabilities |   | $ | 5.5 |   |
|                                               |                      |   |                  |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Derivatives not designated as hedging instruments: |                      |
| Commodity derivatives                              | Other current assets |   | $                     | 0.2    |   | Other current assets |   | $ | 0.1 |   | Other currentliabilities |   | $ | 0.2 |   | Other currentliabilities |   | $ | 0.1 |   |

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| Derivatives in Cash FlowHedging Relationships |   | Change in Value Recognized inOther Comprehensive Income on Derivative (Effective Portion) |   |
|-----------------------------------------------|--------|-------------------------------------------------------------------------------------------|--------|
|                                          |   | For Year Ended December 31,                                                               |   |
|                                          |   | 2010                                                                                      |   |   | 2009 |   |   | 2008 |   |
| Interest rate derivatives                     |   | $                                                                                         | (0.2   | ) |   | $ | (2.5 | ) |   | $ | (8.0 | ) |
| Commodity derivatives                         |   |                                                                                      | --     |   |   |   | -- |   |   |   | (0.7 | ) |
| Total                                         |   | $                                                                                         | (0.2   | ) |   | $ | (2.5 | ) |   | $ | (8.7 | ) |

| Derivatives in Cash Flow Hedging Relationships | Location          |   | Loss Reclassified from Accumulated Other Comprehensive Income/Loss to Income (Effective Portion) |   |
|------------------------------------------------|-------------------|--------|--------------------------------------------------------------------------------------------------|--------|
|                                           |              |   | For Year Ended December 31,                                                                      |   |
|                                           |              |   | 2010                                                                                             |   |   | 2009 |   |   | 2008 |   |
| Interest rate derivatives                      | Interest expense  |   | $                                                                                                | (5.6   | ) |   | $ | (6.6 | ) |   | $ | (2.0 | ) |
| Commodity derivatives                          | Operating revenue |   |                                                                                             | --     |   |   |   | -- |   |   |   | (0.7 | ) |
|                                           |              |   | $                                                                                                | (5.6   | ) |   | $ | (6.6 | ) |   | $ | (2.7 | ) |

| Derivatives in Cash Flow Hedging Relationships | Location         |   | Gain Recognized in Income onIneffective Portion of Derivative |   |
|------------------------------------------------|------------------|--------|---------------------------------------------------------------|--------|
|                                           |             |   | For Year Ended December 31,                              |   |
|                                           |             |   | 2010                                                          |   |   | 2009 |   |   | 2008 |   |
| Interest rate derivatives                      | Interest expense |   | $                                                             | *      |   |   | $ | 0.1 |   |   | $ | * |   |
| * Amount is negligible.                        |             |

| Derivatives Not Designated as Hedging Instruments | Location |   | Gain/(Loss) Recognized inIncome on Derivative |   |
|---------------------------------------------------|----------|--------|-----------------------------------------------|--------|
|                                              |     |   | For Year Ended December 31,                   |   |
|                                              |     |   | 2010                                          |   |   | 2009 |   |   | 2008 |   |
| Commodity derivatives                             | Revenue  |   | $                                             | (0.7   | ) |   | $ | (0.6 | ) |   | $ | 0.7 |   |

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| §   | Level 1 fair values are based on quoted prices, which are available in active markets for identical assets or liabilities as of the measurement date.  Active markets are defined as those in which transactions for identical assets or liabilities occur with sufficient frequency so as to provide pricing information on an ongoing basis (e.g., the New York Mercantile Exchange).  Our Level 1 fair values primarily consist of financial assets and liabilities such as exchange-traded commodity derivative instruments. |
|--------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Level 2 fair values are based on pricing inputs other than quoted prices in active markets (as reflected in Level 1 fair values) and are either directly or indirectly observable as of the measurement date.  Level 2 fair values include instruments that are valued using financial models or other appropriate valuation methodologies.  Such financial models are primarily industry-standard models that consider various assumptions, including quoted forward prices for commodities, the time value of money, volatility factors, current market and contractual prices for the underlying instruments and other relevant economic measures.  Substantially all of these assumptions are: (i) observable in the marketplace throughout the full term of the instrument; (ii) can be derived from observable data; or (iii) are validated by inputs other than quoted prices (e.g., interest rate and yield curves at commonly quoted intervals).  Our Level 2 fair values primarily consist of commodity financial instruments such as forwards, swaps and other instruments transacted on an exchange or over-the-counter.  The fair values of these derivatives instruments are based on observable price quotes for similar products and locations.  Our interest rate derivatives were valued by using appropriate financial models with the implied forward London Interbank Offered Rate (“LIBOR”) yield curve for the same period as the future interest swap settlements. |
|--------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Level 3 fair values are based on unobservable inputs.  Unobservable inputs are used to measure fair value to the extent that observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at the measurement date.  Unobservable inputs reflect the reporting entity’s own ideas about the assumptions that market participants would use in pricing an asset or liability (including assumptions about risk).  Unobservable inputs are based on the best information available in the circumstances, which might include the reporting entity’s internally developed data.  The reporting entity must not ignore information about market participant assumptions that is reasonably available without undue cost and effort.  Level 3 inputs are typically used in connection with internally developed valuation methodologies where we make our best estimate of an instrument’s fair value.  Level 3 generally includes specialized or unique financial instruments that are tailored to meet a customer’s specific needs.  At December 31, 2010, we did not have any Level 3 financial assets or liabilities. |
|--------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|                   |   | At December 31, 2010 |   |
|------------------------|--------|----------------------|--------|
|                   |   | Level 1              |   |   | Level 2 |   |   | Total |   |
| Financial assets:      |   |                 |   |   |   |   |   |   |   |
| Commodity derivatives  |   | $                    | 0.1    |   |   | $ | 0.1 |   |   | $ | 0.2 |   |
|                   |   |                 |   |   |   |   |   |   |   |   |   |   |
| Financial liabilities: |   |                 |   |   |   |   |   |   |   |   |   |   |
| Commodity derivatives  |   | $                    | 0.1    |   |   | $ | 0.1 |   |   | $ | 0.2 |   |

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|                         |   | At December 31, 2009 |    |
|------------------------------|--------|----------------------|---------|
|                         |   | Level 1              |    |   | Level 2 |   |   | Total |   |
| Financial assets:            |   |                 |    |   |   |   |   |   |   |
| Commodity derivatives        |   | $                    | 0.1     |   |   | $ |  * |   |   | $ | 0.1 |   |
|                         |   |                 |    |   |   |   |   |   |   |   |   |   |
| Financial liabilities:       |   |                 |    |   |   |   |   |   |   |   |   |   |
| Commodity derivatives        |   | $                    |  * |   |   | $ | 0.1 |   |   | $ | 0.1 |   |
| Interest rate derivatives    |   |                 | --      |   |   |   | 5.5 |   |   |   | 5.5 |   |
| Total derivative liabilities |   | $                    |  * |   |   | $ | 5.6 |   |   | $ | 5.6 |   |
|                         |   |
| * Amounts are negligible.    |   |

No

|                                                                                                                                                                                                                                                                 |   | December 31, |   |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|--------------|--------|
|                                                                                                                                                                                                                                                                 |   | 2010         |   |   | 2009 |   |
| Working inventory (1)                                                                                                                                                                                                                                                |   | $            | 1.0    |   |   | $ | 4.4 |   |
| Forward sales inventory (2)                                                                                                                                                                                                                                          |   |         | 4.8    |   |   |   | 6.1 |   |
| Total inventory                                                                                                                                                                                                                                                      |   | $            | 5.8    |   |   | $ | 10.5 |   |
|                                                                                                                                                                                                                                                                 |   |         |   |   |   |   |   |   |
| (1)   Working inventory is comprised of inventories of natural gas that are used in the provision for services.(2)   Forward sales inventory consists of identified natural gas volumes dedicated to the fulfillment of forward sales contracts. |   |

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|                                                                                                                                                                                                                                                                                                                                                                                                          |   | For Year Ended December 31, |   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|-----------------------------|--------|
|                                                                                                                                                                                                                                                                                                                                                                                                          |   | 2010                        |   |   | 2009 |   |   | 2008 |   |
| Cost of sales (1)                                                                                                                                                                                                                                                                                                                                                                                             |   | $                           | 584.6  |   |   | $ | 490.0 |   |   | $ | 1,122.4 |   |
| LCM adjustments                                                                                                                                                                                                                                                                                                                                                                                               |   |                        | *      |   |   |   | * |   |   |   | 1.8 |   |
| (1)   Cost of sales is a component of “Operating costs and expenses”, as presented on our Statements of Consolidated Operations. Year-to-year fluctuations in these amounts are primarily due to changes in natural gas prices and sales volumes.     *    We recognized nominal LCM adjustments for the year ended December 31, 2010 and 2009. |   |

Note 8. 

|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |   | Estimated Useful |   |   | At December 31, |    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|------------------|--------|--------|-----------------|---------|
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |   | Life in Years    |   |   | 2010            |    |   | 2009 |   |
| Plant and pipeline facilities (1)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   | 3-45 (4)         |   |   | $               | 5,118.6 |   |   | $ | 4,767.0 |   |
| Underground storage wells and related assets (2)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   | 5-35 (5)         |   |   |            | 474.2   |   |   |   | 432.5 |   |
| Transportation equipment (3)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   | 3-10             |   |   |            | 13.0    |   |   |   | 11.3 |   |
| Land                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |   |             |   |   |            |    | 46.0 |   |   |   | 27.8 |   |
| Construction in progress                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   |             |   |   |            |    | 807.4 |   |   |   | 233.6 |   |
| Total                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |             |   |   |            |    | 6,459.2 |   |   |   | 5,472.2 |   |
| Less accumulated depreciation                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |   |             |   |   |            |    | 1,097.0 |   |   |   | 922.6 |   |
| Property, plant and equipment, net                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |   |             |   |   |            | $       | 5,362.2 |   |   | $ | 4,549.6 |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |   |             |   |   |            |    |   |   |   |   |   |   |
| (1)   Includes natural gas, NGL and petrochemical pipelines, NGL fractionation facilities, office furniture and equipment, buildings and related assets.(2)   Underground storage facilities include product storage caverns and related assets such as pipes and compressors.(3)   Transportation equipment includes vehicles and similar assets used in our operations.(4)   In general, the estimated useful lives of major assets within this category are: pipelines, 18-45 years (with some equipment at 5 years); office furniture and equipment, 3-20 years; buildings, 20-35 years; and fractionation facilities, 28 years.(5)   In general, the estimated useful life of underground storage facilities is 20-35 years (with some components at 5 years). |   |

|                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   | For Year Ended December 31, |   |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|-----------------------------|--------|
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   | 2010                        |   |   | 2009 |   |   | 2008 |   |
| Depreciation expense (1)                                                                                                                                                                                                                                                                                                                                                                                                                                                         |   | $                           | 187.3  |   |   | $ | 176.7 |   |   | $ | 158.5 |   |
| Capitalized interest (2, 3)                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |                        | 3.2    |   |   |   | 0.3 |   |   |   | 0.3 |   |
| (1)   Depreciation expense is a component of “Costs and expenses” as presented in our Statements of Consolidated Operations.(2)   Capitalized interest increases the carrying value of the associated asset and reduces interest expense during the period it is recorded.(3)   The increase in capitalized interest for 2010 is due to our election to fund the Haynesville Extension in line with our respective ownership interest. |   |

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| ARO liability balance, December 31, 2008 |   | $      | 4.6  |   |
|------------------------------------------|--------|--------|------|--------|
| Liabilities settled                      |   |   | (0.7 | )      |
| Accretion expense                        |   |   | 0.6  |   |
| Revisions in estimated cash flows        |   |   | 5.9  |   |
| ARO liability balance, December 31, 2009 |   |   | 10.4 |   |
| Liabilities settled                      |   |   | (5.2 | )      |
| Accretion expense                        |   |   | 0.7  |   |
| Revisions in estimated cash flows        |   |   | 9.7  |   |
| ARO liability balance, December 31, 2010 |   | $      | 15.6 |   |

| 2011 |   |   | 2012   |   |   | 2013   |   |   | 2014 |   |   | 2015 |   |
|------|--------|--------|--------|--------|--------|--------|--------|--------|------|--------|--------|------|--------|
| $    | 1.0    |   |   | $      | 1.1    |   |   | $      | 1.2  |   |   | $    | 1.2    |   |   | $ | 1.3 |   |

Note 9

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|                                  |   | At December 31, |   |
|---------------------------------------|--------|-----------------|--------|
|                                  |   | 2010            |   |   | 2009 |   |
| BALANCE SHEET DATA:                   |   |            |   |   |   |   |
| Current assets                        |   | $               | 15.3   |   |   | $ | 24.4 |   |
| Property, plant and equipment, net    |   |            | 2.4    |   |   |   | 3.2 |   |
| Other assets                          |   |            | 9.7    |   |   |   | 13.5 |   |
| Total assets                          |   | $               | 27.4   |   |   | $ | 41.1 |   |
|                                  |   |            |   |   |   |   |   |   |
| Current liabilities                   |   | $               | 13.0   |   |   | $ | 10.6 |   |
| Other liabilities                     |   |            | *      |   |   |   | 17.7 |   |
| Combined equity                       |   |            | 14.4   |   |   |   | 12.8 |   |
| Total liabilities and combined equity |   | $               | 27.4   |   |   | $ | 41.1 |   |
|                                  |   |            |   |   |   |   |   |   |
| * Amount is negligible.               |   |

|                   |   | For Year Ended December 31, |   |
|------------------------|--------|-----------------------------|--------|
|                   |   | 2010                        |   |   | 2009 |   |   | 2008 |   |
| INCOME STATEMENT DATA: |   |                        |   |   |   |   |   |   |   |
| Revenues               |   | $                           | 183.6  |   |   | $ | 164.5 |   |   | $ | 371.8 |   |
| Operating income       |   |                        | 2.0    |   |   |   | 3.7 |   |   |   | 7.2 |   |
| Net income             |   |                        | 1.5    |   |   |   | 2.2 |   |   |   | 1.8 |   |

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Note 10

|                                  |   | At December 31, 2010 |   |   | At December 31, 2009 |   |
|---------------------------------------|--------|----------------------|--------|--------|----------------------|--------|
|                                  |   | Gross                |   |   | Accum.               |   |   | Carrying |   |   | Gross |   |   | Accum. |   |   | Carrying |   |
|                                  |   | Value                |   |   | Amort.               |   |   | Value |   |   | Value |   |   | Amort. |   |   | Value |   |
| NGL Pipelines & Services:         |   |                 |   |   |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Customer relationship intangibles     |   | $                    | 24.6   |   |                 | $      | (11.0 | ) |   | $ | 13.6 |   |   | $ | 24.6 |   |   | $ | (8.9 | ) |   | $ | 15.7 |   |
| Contract based intangibles            |   |                 | 43.2   |   |                 |   | (29.5 | ) |   |   | 13.7 |   |   |   | 40.8 |   |   |   | (24.7 | ) |   |   | 16.1 |   |
| Natural Gas Pipelines & Services: |   |                 |   |   |                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Customer relationship intangibles     |   |                 | 21.0   |   |                 |   | (10.3 | ) |   |   | 10.7 |   |   |   | 21.0 |   |   |   | (9.0 | ) |   |   | 12.0 |   |
| Total all segments                    |   | $                    | 88.8   |   |                 | $      | (50.8 | ) |   | $ | 38.0 |   |   | $ | 86.4 |   |   | $ | (42.6 | ) |   | $ | 43.8 |   |

|                                 |   | For Year Ended December 31, |   |
|--------------------------------------|--------|-----------------------------|--------|
|                                 |   | 2010                        |   |   | 2009 |   |   | 2008 |   |
| NGL Pipelines & Services         |   | $                           | 6.9    |   |   | $ | 7.1 |   |   | $ | 7.6 |   |
| Natural Gas Pipelines & Services |   |                        | 1.3    |   |   |   | 1.4 |   |   |   | 1.5 |   |
| Total segments                       |   | $                           | 8.2    |   |   | $ | 8.5 |   |   | $ | 9.1 |   |

|                                 |   | For Year Ended December 31, |   |
|--------------------------------------|--------|-----------------------------|--------|
|                                 |   | 2011                        |   |   | 2012 |   |   | 2013 |   |   | 2014 |   |   | 2015 |   |
| NGL Pipelines & Services         |   | $                           | 6.4    |   |   | $ | 2.9 |   |   | $ | 1.7 |   |   | $ | 1.5 |   |   | $ | 1.4 |   |
| Natural Gas Pipelines & Services |   |                        | 1.2    |   |   |   | 1.1 |   |   |   | 1.0 |   |   |   | 0.9 |   |   |   | 0.8 |   |
| Total segments                       |   | $                           | 7.6    |   |   | $ | 4.0 |   |   | $ | 2.7 |   |   | $ | 2.4 |   |   | $ | 2.2 |   |

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Note 11

|                                                                                                                                                                                                                                                    |   | At December 31, |   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|-----------------|--------|
|                                                                                                                                                                                                                                                    |   | 2010            |   |   | 2009 |   |
| DEP Multi-Year Revolving Credit Facility, variable rate, due October 2013                                                                                                                                                                               |   | $               | 106.0  |   |   | $ | -- |   |
| $400 Million Term Loan Facility, variable rate, due October 2013                                                                                                                                                                                        |   |            | 400.0  |   |   |   | -- |   |
| Revolving Credit Facility, variable rate, repaid October 2010 (1)                                                                                                                                                                                       |   |            | --     |   |   |   | 175.0 |   |
| Term Loan Agreement, variable rate, due December 2011                                                                                                                                                                                                   |   |            | 282.3  |   |   |   | 282.3 |   |
| Total principal amount of debt obligations                                                                                                                                                                                                              |   | $               | 788.3  |   |   | $ | 457.3 |   |
| Less: Current maturities of debt (2)                                                                                                                                                                                                                    |   |            | (282.3 | ) |   |   | -- |   |
| Total long-term debt                                                                                                                                                                                                                                    |   | $               | 506.0  |   |   | $ | 457.3 |   |
|                                                                                                                                                                                                                                                    |   |            |   |   |   |   |   |   |
| (1)   This agreement was terminated on October 25, 2010 using proceeds from borrowings on our $400 Million Term Loan Facility.(2)   Current maturities of debt reflect the classification of such obligations at December 31, 2010. |   |

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|                                     |   | Range of            | Weighted-average   |
|------------------------------------------|--------|---------------------|--------------------|
|                                     |   | Interest Rates Paid | interest rate paid |
| DEP Multi-Year Revolving Credit Facility |   | 2.00% to 2.02%      | 2.01%              |
| $400 Million Term Loan Facility          |   | 2.25% to 2.26%      | 2.26%              |
| Term Loan Agreement                      |   | 0.93% to 1.09%      | 1.03%              |
| Revolving Credit Facility                |   | 0.80% to 3.25%      | 0.95%              |
| Loan Agreement with EPO                  |   | 2.76% to 2.82%      | 2.81%              |

|                                                                                                   |   | At December 31, |   |
|--------------------------------------------------------------------------------------------------------|--------|-----------------|--------|
|                                                                                                   |   | 2010            |   |   | 2009 |   |
| 9.9% fixed interest rate senior secured notes due December 2010 (“Series B” notes)         |   | $               | --     |   |   | $ | 3.2 |   |
| Subordinated note payable to an affiliate of other co-ventureparticipant (“LL&E Note”) |   |            | 3.2    |   |   |   | 7.5 |   |
| Total joint venture debt principal obligation                                                          |   | $               | 3.2    |   |   | $ | 10.7 |   |

Note 12. 

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|          |   | Number of    |   |   | Total    |   |
|---------------|--------|--------------|--------|--------|----------|--------|
|          |   | Common Units |   |   | Net Cash |   |
|          |   | Issued       |   |   | Proceeds |   |
|          |   |         |   |   |     |   |
| February DRIP |   |         | 10,385 |   |     | $      | 0.2 |   |
| May DRIP      |   |         | 11,521 |   |     |   | 0.3 |   |
| May EUPP      |   |         | 11,017 |   |     |   | 0.3 |   |
| August DRIP   |   |         | 9,856  |   |     |   | 0.2 |   |
| August EUPP   |   |         | 6,962  |   |     |   | 0.2 |   |
| November DRIP |   |         | 9,529  |   |     |   | 0.3 |   |
| November EUPP |   |         | 6,553  |   |     |   | 0.2 |   |
| Total 2010    |   |         | 65,823 |   |     | $      | 1.7 |   |

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|                                                                                                    |   |   |       |   |    |   |        |     |   |   | Total       |   |
|---------------------------------------------------------------------------------------------------------|--------|--------|------------|--------|---------|--------|-------------|----------|--------|--------|-------------|--------|
|                                                                                                    |   | Common |       |   | Class B |   |        | Treasury |   |   | Outstanding |   |
|                                                                                                    |   | Units  |       |   | Units   |   |        | Units    |   |   | Units       |   |
| Common units outstanding, January 1, 2008                                                               |   |   | 20,301,571 |   |    |   | --          |     |   |   | --          |   |   |   | 20,301,571 |   |
| Common units sold to EPO in connection with the DEP IIdrop down transaction in December 2008            |   |   | 41,529     |   |    |   | --          |     |   |   | --          |   |   |   | 41,529 |   |
| Class B units issued in connection with the DEP IIdrop down transaction in December 2008                |   |   | --         |   |    |   | 37,333,887  |     |   |   | --          |   |   |   | 37,333,887 |   |
| Common units outstanding, December 31, 2008                                                             |   |   | 20,343,100 |   |    |   | 37,333,887  |     |   |   | --          |   |   |   | 57,676,987 |   |
| Conversion of Class B units to common units on February 1, 2009                                         |   |   | 37,333,887 |   |    |   | (37,333,887 | )        |   |   | --          |   |   |   | -- |   |
| June 2009 underwritten offering                                                                         |   |   | 8,000,000  |   |    |   | --          |     |   |   | --          |   |   |   | 8,000,000 |   |
| Acquisition of common units from EPO in June 2009                                                       |   |   | (8,000,000 | )      |    |   | --          |     |   |   | 8,000,000   |   |   |   | -- |   |
| Cancellation of treasury units in June 2009                                                             |   |   | --         |   |    |   | --          |     |   |   | (8,000,000  | )      |   |   | (8,000,000 | ) |
| Additional units issued in July 2009 in connection with June 2009underwritten offering                  |   |   | 943,400    |   |    |   | --          |     |   |   | --          |   |   |   | 943,400 |   |
| Acquisition of common units from EPO in July 2009                                                       |   |   | (943,400   | )      |    |   | --          |     |   |   | 943,400     |   |   |   | -- |   |
| Cancellation of treasury units in July 2009                                                             |   |   | --         |   |    |   | --          |     |   |   | (943,400    | )      |   |   | (943,400 | ) |
| Common units outstanding, December 31, 2009                                                             |   |   | 57,676,987 |   |    |   | --          |     |   |   | --          |   |   |   | 57,676,987 |   |
| Common units issued in connection with DRIP and EUPPduring year                                         |   |   | 65,823     |   |    |   | --          |     |   |   | --          |   |   |   | 65,823 |   |
| Common units issued to independent directors of DEP GPin connection with our 2010 Plan in February 2010 |   |   | 6,348      |   |    |   | --          |     |   |   | --          |   |   |   | 6,348 |   |
| Common units outstanding, December 31, 2010                                                             |   |   | 57,749,158 |   |    |   | --          |     |   |   | --          |   |   |   | 57,749,158 |   |

|             |   | Cash Distribution History |
|------------------|--------|---------------------------|
|             |   | Per                       |   | Record | Payment |
|             |   | Unit                      |   | Date | Date |
| 2009             |   |                      |   |   |   |
| 1st Quarter      |   | $                         | 0.4300 |   | April 30, 2009 | May 8, 2009 |
| 2nd Quarter      |   | $                         | 0.4350 |   | July 31, 2009 | August 7, 2009 |
| 3rd Quarter      |   | $                         | 0.4400 |   | October 30, 2009 | November 5, 2009 |
| 4th Quarter      |   | $                         | 0.4450 |   | January 29, 2010 | February 5, 2010 |
| 2010             |   |                      |   |   |   |   |
| 1st Quarter      |   | $                         | 0.4475 |   | April 30, 2010 | May 6, 2010 |
| 2nd Quarter      |   | $                         | 0.4500 |   | July 30, 2010 | August 6, 2010 |
| 3rd Quarter      |   | $                         | 0.4525 |   | October 29, 2010 | November 8, 2010 |
| 4th Quarter |   | $                         | 0.4550 |   | January 31, 2011 | February 7, 2011 |

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Note 13. 

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|                                                                                                 |   | For the Year Ended |      |
|------------------------------------------------------------------------------------------------------|--------|--------------------|-----------|
|                                                                                                 |   | December 31,       |      |
|                                                                                                 |   | 2010               |      |   | 2009 |   |   | 2008 |   |
|                                                                                                 |   |               |      |   |   |   |   |   |   |
| Total net income of DEP I Midstream Businesses, after special allocations                            |   | $                  | 72.4      |   |   | $ | 68.0 |   |   | $ | 56.4 |   |
| Multiplied by Parent 34% interest in net income                                                      |   |               | x 34 | % |   |   | x 34 | % |   |   | x 34 | % |
| Parent 34% interest in net income, after special allocations                                         |   |               | 24.6      |   |   |   | 23.1 |   |   |   | 19.2 |   |
| Add (deduct) operational measurement gains (losses) allocated to Parent                              |   |               | 9.5       |   |   |   | (1.7 | ) |   |   | (6.8 | ) |
| Less depreciation expense related to capital projects funded entirely by and allocated to Parent     |   |               | (6.4      | ) |   |   | (6.1 | ) |   |   | (1.0 | ) |
| Net income attributable to noncontrolling interest – DEP I Midstream Businesses – Parent |   | $                  | 27.7      |   |   | $ | 15.3 |   |   | $ | 11.4 |   |

| December 31, 2008 balance                                                                                         |   | $      | 478.4  |   |
|-------------------------------------------------------------------------------------------------------------------|--------|--------|--------|--------|
| Net income attributable to noncontrolling interest – DEP I Midstream Businesses – Parent              |   |   | 15.3   |   |
| Contributions made by EPO to South Texas NGL and Mont Belvieu Cavernsin connection with the following agreements: |   |   |   |   |
| Caverns LLC Agreement                                                                                             |   |   | 16.6   |   |
| Omnibus Agreement                                                                                                 |   |   | 1.4    |   |
| Other contributions made by EPO to the DEP I Midstream Businesses                                                 |   |   | 0.9    |   |
| Distributions paid to EPO by the DEP I Midstream Businesses                                                       |   |   | (25.3  | )      |
| December 31, 2009 balance                                                                                         |   |   | 487.3  |   |
| Net income attributable to noncontrolling interest – DEP I Midstream Businesses – Parent              |   |   | 27.7   |   |
| Contributions made by EPO to Mont Belvieu Caverns in connection with the Caverns LLC Agreement                    |   |   | 18.9   |   |
| Contributions made by EPO to Acadian Gas in connection with the Amended Acadian LLC Agreement                     |   |   | 148.9  |   |
| Other contributions made by EPO to the DEP I Midstream Businesses                                                 |   |   | 28.4   |   |
| Distributions paid to EPO by the DEP I Midstream Businesses                                                       |   |   | (24.5  | )      |
| December 31, 2010 balance                                                                                         |   | $      | 686.7  |   |

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|                                                                                          |   | EPO    |   |   | DEP    |   |
|-----------------------------------------------------------------------------------------------|--------|--------|--------|--------|--------|--------|
| Total net income of DEP II Midstream Businesses                                               |   |   |   |   | $      | 0.5    |   |   | $ | 0.5 |   |
| Multiplied by each owner's Percentage Interest                                                |   |   |   |   |   | 77.4   | % |   |   | 22.6 | % |
| Base earnings allocation to each owner                                                        |   |   |   |   |   | 0.4    |   |   |   | 0.1 |   |
| Additional earnings allocation to Duncan Energy Partners:                                     |   |   |   |   |   |   |   |   |   |   |   |
| Total distributions paid by the DEP II Midstream  Businesses with respect to period |   | $      | 5.4    |   |   |   |   |   |   |   |   |   |
| Multiplied by 22.6% Percentage Interest of Duncan Energy Partners                             |   |   | 22.6   | %      |   |   |   |   |   |   |   |   |
| Duncan Energy Partners’ Percentage Interest in the total cash distributions             |   |   |   |   |   |   |   |   |   |   |   |   |
|    paid by the DEP II Midstream Businesses with respect to period              |   |   | 1.2    |   |   |   |   |   |   |   |   |   |
| Less actual distributions paid to Duncan Energy Partners                                      |   |   |   |   |   |   |   |   |   |   |   |   |
|    with respect to period based on annualized return for period                |   |   | (5.6   | )      |   |   | (4.4 | ) |   |   | 4.4 |   |
| Net loss attributable to EPO as noncontrolling interest                                       |   |   |   |   |   | $      | (4.0 | ) |   |   |   |   |
| Net income attributable to Duncan Energy Partners                                             |   |   |   |   |   |   |   |   |   | $ | 4.5 |   |

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|                                                                                                                                                              |   |   |   |   | EPO    |   |   | DEP    |   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|--------|--------|--------|--------|--------|--------|--------|--------|
| Total net loss of DEP II Midstream Businesses                                                                                                                     |   |   |   |   | $      | (0.5   | )      |   | $      | (0.5 | ) |
| Multiplied by each owner's Percentage Interest                                                                                                                    |   |   |   |   |   | 77.4   | %      |   |   | 22.6 | % |
| Base earnings allocation to each owner                                                                                                                            |   |   |   |   |   | (0.4   | )      |   |   | (0.1 | ) |
| Additional earnings allocation to Duncan Energy Partners:                                                                                                         |   |   |   |   |   |   |   |   |   |   |   |
| Total distributions paid by the DEP II Midstream Businesses with respect to period                                                                                |   | $      | 116.3  |   |   |   |   |   |   |   |   |   |
| Multiplied by 22.6% Percentage Interest of Duncan Energy Partners                                                                                                 |   |   | 22.6   | %      |   |   |   |   |   |   |   |   |
| Duncan Energy Partners’ Percentage Interest in the total cash distributions   paid by the DEP II Midstream Businesses with respect to period |   |   | 26.3   |   |   |   |   |   |   |   |   |   |
| Less actual distributions paid to Duncan Energy Partners   with respect to period based on annualized return for period                            |   |   | (86.5  | )      |   |   | (60.2  | )      |   |   | 60.2 |   |
| Net loss attributable to EPO as noncontrolling interest                                                                                                           |   |   |   |   |   | $      | (60.6  | )      |   |   |   |   |
| Net income attributable to Duncan Energy Partners                                                                                                                 |   |   |   |   |   |   |   |   |   | $ | 60.1 |   |

|                                                                                                                                                              |   |   |   |   | EPO    |   |   | DEP    |   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|--------|--------|--------|--------|--------|--------|--------|--------|
| Total net loss of DEP II Midstream Businesses                                                                                                                     |   |   |   |   | $      | (8.4   | )      |   | $      | (8.4 | ) |
| Multiplied by each owner's Percentage Interest                                                                                                                    |   |   |   |   |   | 77.4   | %      |   |   | 22.6 | % |
| Base earnings allocation to each owner                                                                                                                            |   |   |   |   |   | (6.5   | )      |   |   | (1.9 | ) |
| Additional earnings allocation to Duncan Energy Partners:                                                                                                         |   |   |   |   |   |   |   |   |   |   |   |
| Total distributions paid by the DEP II Midstream Businesses with respect to period                                                                                |   | $      | 134.3  |   |   |   |   |   |   |   |   |   |
| Multiplied by 22.6% Percentage Interest of Duncan Energy Partners                                                                                                 |   |   | 22.6   | %      |   |   |   |   |   |   |   |   |
| Duncan Energy Partners’ Percentage Interest in the total cash distributions   paid by the DEP II Midstream Businesses with respect to period |   |   | 30.3   |   |   |   |   |   |   |   |   |   |
| Less actual distributions paid to Duncan Energy Partners   with respect to period based on annualized return for period                            |   |   | (88.2  | )      |   |   | (57.9  | )      |   |   | 57.9 |   |
| Net loss attributable to EPO as noncontrolling interest                                                                                                           |   |   |   |   |   | $      | (64.4  | )      |   |   |   |   |
| Net income attributable to Duncan Energy Partners                                                                                                                 |   |   |   |   |   |   |   |   |   | $ | 56.0 |   |

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| December 31, 2008 balance                                                                                                                           |   | $      | 2,613.0 |   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------|--------|--------|---------|--------|
| Allocated loss from DEP II Midstream Businesses to EPO as Parent                                                                                    |   |   | (60.6   | )      |
| Contributions by EPO in connection with expansion cash calls                                                                                        |   |   | 344.5   |   |
| Distributions to noncontrolling interest of  subsidiary operating cash flows                                                              |   |   | (31.8   | )      |
| Other general cash contributions from noncontrolling interest                                                                                       |   |   | 23.1    |   |
| December 31, 2009 balance                                                                                                                           |   |   | 2,888.2 |   |
| Allocated loss from DEP II Midstream Businesses to EPO as Parent                                                                                    |   |   | (64.4   | )      |
| Contributions by EPO in connection with expansion cash calls                                                                                        |   |   | 320.2   |   |
| Distributions to noncontrolling interest of  subsidiary operating cash flows                                                              |   |   | (47.7   | )      |
| Return of contributions to EPO in connection with the transfer of an     expansion capital project to Mont Belvieu Caverns |   |   | (25.4   | )      |
| Other general cash contributions from noncontrolling interest                                                                                       |   |   | 1.6     |   |
| December 31, 2010 balance                                                                                                                           |   | $      | 3,072.5 |   |

Note 14. 

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|                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   | For Year Ended December 31, |     |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|-----------------------------|----------|
|                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   | 2010                        |     |   | 2009 |   |   | 2008 |   |
| Revenues                                                                                                                                                                                                                                                                                                                                                                                                                                                       |   | $                           | 1,115.1  |   |   | $ | 979.3 |   |   | $ | 1,598.1 |   |
| Less:   Operating costs and expenses                                                                                                                                                                                                                                                                                                                                                                                                            |   |                        | (1,030.4 | ) |   |   | (908.3 | ) |   |   | (1,512.8 | ) |
| Add:   Equity in income of Evangeline                                                                                                                                                                                                                                                                                                                                                                                                           |   |                        | 0.8      |   |   |   | 1.1 |   |   |   | 0.9 |   |
| Depreciation, amortization and accretion inoperating costs and expenses (1)                                                                                                                                                                                                                                                                                                                                                                                    |   |                        | 201.0    |   |   |   | 186.3 |   |   |   | 167.3 |   |
| Non-cash asset impairment charges included inoperating costs and expenses (2)                                                                                                                                                                                                                                                                                                                                                                                  |   |                        | 5.2      |   |   |   | 4.2 |   |   |   | -- |   |
| Loss (gain) from asset sales and relatedtransactions in operating costs and expenses (3)                                                                                                                                                                                                                                                                                                                                                                       |   |                        | 7.9      |   |   |   | (0.5 | ) |   |   | (0.5 | ) |
| Total segment gross operating margin                                                                                                                                                                                                                                                                                                                                                                                                                           |   | $                           | 299.6    |   |   | $ | 262.1 |   |   | $ | 253.0 |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |                        |     |   |   |   |   |   |   |   |   |   |
| (1)   Amount is a component of “Depreciation, amortization and accretion” as presented on the Statements of Consolidated Cash Flows.(2)   See Note 6 for additional information regarding non-cash asset impairment charges.(3)   Amount presented for the twelve months ended December 31, 2010 includes a $9.1 million loss related to the disposal of a non-strategic pipeline segment owned by Enterprise Texas. |   |

|                                                                                 |   | For the Year Ended December 31, |   |
|--------------------------------------------------------------------------------------|--------|---------------------------------|--------|
|                                                                                 |   | 2010                            |   |   | 2009 |   |   | 2008 |   |
| Total segment gross operating margin                                                 |   | $                               | 299.6  |   |   | $ | 262.1 |   |   | $ | 253.0 |   |
| Adjustments to reconcile total segment grossoperating margin to operating income:    |   |                            |   |   |   |   |   |   |   |   |   |   |
| Depreciation, amortization and accretion inoperating costs and expenses              |   |                            | (201.0 | ) |   |   | (186.3 | ) |   |   | (167.3 | ) |
| Non-cash asset impairment charges included inoperating costs and expenses            |   |                            | (5.2   | ) |   |   | (4.2 | ) |   |   | -- |   |
| Gain (loss) from asset sales and related transactions inoperating costs and expenses |   |                            | (7.9   | ) |   |   | 0.5 |   |   |   | 0.5 |   |
| General and administrative costs                                                     |   |                            | (20.0  | ) |   |   | (11.2 | ) |   |   | (18.3 | ) |
| Operating income                                                                     |   |                            | 65.5   |   |   |   | 60.9 |   |   |   | 67.9 |   |
| Other expense, net                                                                   |   |                            | (12.1  | ) |   |   | (13.8 | ) |   |   | (11.5 | ) |
| Income before provision for income taxes                                             |   | $                               | 53.4   |   |   | $ | 47.1 |   |   | $ | 56.4 |   |

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|                                                               |   | Reportable Segments |    |   |           |   |   |          |   |
|--------------------------------------------------------------------|--------|---------------------|---------|--------|----------------|--------|--------|---------------|--------|
|                                                               |   | Natural Gas         |    |   | NGL            |   |   |          |   |   | Adjustments |   |   |   |   |
|                                                               |   | Pipelines           |    |   | Pipelines      |   |   | Petrochemical |   |   | and |   |   | Consolidated |   |
|                                                               |   | & Services      |    |   | & Services |   |   | Services      |   |   | Eliminations |   |   | Totals |   |
| Revenues from third parties:                                       |   |                |    |   |           |   |   |          |   |   |   |   |   |   |   |
| Year ended December 31, 2010                                       |   | $                   | 408.3   |   |           | $      | 115.4  |          |   | $ | 13.6 |   |   | $ | -- |   |   | $ | 537.3 |   |
| Year ended December 31, 2009                                       |   |                | 382.2   |   |           |   | 96.2   |          |   |   | 13.6 |   |   |   | -- |   |   |   | 492.0 |   |
| Year ended December 31, 2008                                       |   |                | 761.8   |   |           |   | 80.4   |          |   |   | 14.2 |   |   |   | -- |   |   |   | 856.4 |   |
|                                                               |   |                |    |   |           |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |
| Revenues from related parties:                                     |   |                |    |   |           |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |
| Year ended December 31, 2010                                       |   |                | 430.3   |   |           |   | 147.5  |          |   |   | -- |   |   |   | -- |   |   |   | 577.8 |   |
| Year ended December 31, 2009                                       |   |                | 356.5   |   |           |   | 130.8  |          |   |   | -- |   |   |   | -- |   |   |   | 487.3 |   |
| Year ended December 31, 2008                                       |   |                | 593.5   |   |           |   | 148.2  |          |   |   | -- |   |   |   | -- |   |   |   | 741.7 |   |
|                                                               |   |                |    |   |           |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |
| Total revenues:                                                    |   |                |    |   |           |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |
| Year ended December 31, 2010                                       |   |                | 838.6   |   |           |   | 262.9  |          |   |   | 13.6 |   |   |   | -- |   |   |   | 1,115.1 |   |
| Year ended December 31, 2009                                       |   |                | 738.7   |   |           |   | 227.0  |          |   |   | 13.6 |   |   |   | -- |   |   |   | 979.3 |   |
| Year ended December 31, 2008                                       |   |                | 1,355.3 |   |           |   | 228.6  |          |   |   | 14.2 |   |   |   | -- |   |   |   | 1,598.1 |   |
|                                                               |   |                |    |   |           |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |
| Equity in income of Evangeline:                                    |   |                |    |   |           |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |
| Year ended December 31, 2010                                       |   |                | 0.8     |   |           |   | --     |          |   |   | -- |   |   |   | -- |   |   |   | 0.8 |   |
| Year ended December 31, 2009                                       |   |                | 1.1     |   |           |   | --     |          |   |   | -- |   |   |   | -- |   |   |   | 1.1 |   |
| Year ended December 31, 2008                                       |   |                | 0.9     |   |           |   | --     |          |   |   | -- |   |   |   | -- |   |   |   | 0.9 |   |
|                                                               |   |                |    |   |           |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |
| Gross operating margin by individualbusiness segment and in total: |   |                |    |   |           |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |
| Year ended December 31, 2010                                       |   |                | 167.2   |   |           |   | 122.8  |          |   |   | 9.6 |   |   |   | -- |   |   |   | 299.6 |   |
| Year ended December 31, 2009                                       |   |                | 148.2   |   |           |   | 103.4  |          |   |   | 10.5 |   |   |   | -- |   |   |   | 262.1 |   |
| Year ended December 31, 2008                                       |   |                | 159.0   |   |           |   | 82.9   |          |   |   | 11.1 |   |   |   | -- |   |   |   | 253.0 |   |
|                                                               |   |                |    |   |           |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |
| Segment assets:                                                    |   |                |    |   |           |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |
| At December 31, 2010                                               |   |                | 3,527.6 |   |           |   | 996.1  |          |   |   | 80.4 |   |   |   | 807.4 |   |   |   | 5,411.5 |   |
| At December 31, 2009                                               |   |                | 3,340.8 |   |           |   | 946.1  |          |   |   | 83.3 |   |   |   | 233.7 |   |   |   | 4,603.9 |   |
| At December 31, 2008                                               |   |                | 2,909.8 |   |           |   | 936.5  |          |   |   | 86.6 |   |   |   | 459.0 |   |   |   | 4,391.9 |   |
|                                                               |   |                |    |   |           |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |
| Property, plant and equipment:                                     |   |                |    |   |           |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |
| At December 31, 2010                                               |   |                | 3,506.1 |   |           |   | 968.3  |          |   |   | 80.4 |   |   |   | 807.4 |   |   |   | 5,362.2 |   |
| At December 31, 2009                                               |   |                | 3,318.8 |   |           |   | 913.8  |          |   |   | 83.4 |   |   |   | 233.6 |   |   |   | 4,549.6 |   |
| At December 31, 2008                                               |   |                | 2,887.5 |   |           |   | 897.1  |          |   |   | 86.6 |   |   |   | 459.0 |   |   |   | 4,330.2 |   |
|                                                               |   |                |    |   |           |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |
| Investment in Evangeline: (see Note 9)                             |   |                |    |   |           |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |
| At December 31, 2010                                               |   |                | 6.4     |   |           |   | --     |          |   |   | -- |   |   |   | -- |   |   |   | 6.4 |   |
| At December 31, 2009                                               |   |                | 5.6     |   |           |   | --     |          |   |   | -- |   |   |   | -- |   |   |   | 5.6 |   |
| At December 31, 2008                                               |   |                | 4.5     |   |           |   | --     |          |   |   | -- |   |   |   | -- |   |   |   | 4.5 |   |
|                                                               |   |                |    |   |           |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |
| Intangible assets:                                                 |   |                |    |   |           |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |
| At December 31, 2010                                               |   |                | 10.7    |   |           |   | 27.3   |          |   |   | -- |   |   |   | -- |   |   |   | 38.0 |   |
| At December 31, 2009                                               |   |                | 12.0    |   |           |   | 31.8   |          |   |   | -- |   |   |   | -- |   |   |   | 43.8 |   |
| At December 31, 2008                                               |   |                | 13.4    |   |           |   | 38.9   |          |   |   | -- |   |   |   | -- |   |   |   | 52.3 |   |
|                                                               |   |                |    |   |           |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |
| Goodwill:                                                          |   |                |    |   |           |   |   |          |   |   |   |   |   |   |   |   |   |   |   |   |
| At December 31, 2010                                               |   |                | 4.4     |   |           |   | 0.5    |          |   |   | -- |   |   |   | -- |   |   |   | 4.9 |   |
| At December 31, 2009                                               |   |                | 4.4     |   |           |   | 0.5    |          |   |   | -- |   |   |   | -- |   |   |   | 4.9 |   |
| At December 31, 2008                                               |   |                | 4.4     |   |           |   | 0.5    |          |   |   | -- |   |   |   | -- |   |   |   | 4.9 |   |

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|                                                  |   | For the Year Ended December 31, |    |
|-------------------------------------------------------|--------|---------------------------------|---------|
|                                                  |   | 2010                            |    |   | 2009 |   |   | 2008 |   |
| Natural Gas Pipelines & Services:                 |   |                            |    |   |   |   |   |   |   |
| Sales of natural gas                                  |   | $                               | 536.5   |   |   | $ | 460.2 |   |   | $ | 1,100.2 |   |
| Natural gas transportation services                   |   |                            | 286.1   |   |   |   | 263.2 |   |   |   | 246.7 |   |
| Natural gas storage services                          |   |                            | 16.0    |   |   |   | 15.3 |   |   |   | 8.4 |   |
| Total                                                 |   | $                               | 838.6   |   |   | $ | 738.7 |   |   | $ | 1,355.3 |   |
| NGL Pipelines & Services:                         |   |                            |    |   |   |   |   |   |   |   |   |   |
| Sales of NGLs                                         |   | $                               | 45.9    |   |   | $ | 35.0 |   |   | $ | 47.9 |   |
| Sales of other products                               |   |                            | 18.2    |   |   |   | 11.3 |   |   |   | 15.0 |   |
| NGL and related product storage services              |   |                            | 120.5   |   |   |   | 104.9 |   |   |   | 87.4 |   |
| NGL fractionation services                            |   |                            | 30.8    |   |   |   | 29.5 |   |   |   | 32.4 |   |
| NGL transportation services                           |   |                            | 45.4    |   |   |   | 43.8 |   |   |   | 43.6 |   |
| Other services                                        |   |                            | 2.1     |   |   |   | 2.5 |   |   |   | 2.3 |   |
| Total                                                 |   | $                               | 262.9   |   |   | $ | 227.0 |   |   | $ | 228.6 |   |
| Petrochemical Services:                               |   |                            |    |   |   |   |   |   |   |   |   |   |
| Propylene transportation services                     |   | $                               | 13.6    |   |   | $ | 13.6 |   |   | $ | 14.2 |   |
| Total consolidated revenues                           |   | $                               | 1,115.1 |   |   | $ | 979.3 |   |   | $ | 1,598.1 |   |
|                                                  |   |                            |    |   |   |   |   |   |   |   |   |   |
| Consolidated cost and expenses:                       |   |                            |    |   |   |   |   |   |   |   |   |   |
| Operating costs and expenses:                         |   |                            |    |   |   |   |   |   |   |   |   |   |
| Cost of sales (natural gas and NGLs)                  |   | $                               | 573.6   |   |   | $ | 479.7 |   |   | $ | 1,123.9 |   |
| Depreciation, amortization and accretion              |   |                            | 201.0   |   |   |   | 186.3 |   |   |   | 167.4 |   |
| Loss (gain) from asset sales and related transactions |   |                            | 7.9     |   |   |   | (0.5 | ) |   |   | (0.5 | ) |
| Other operating expenses                              |   |                            | 247.9   |   |   |   | 242.8 |   |   |   | 222.0 |   |
| General and administrative costs                      |   |                            | 20.0    |   |   |   | 11.2 |   |   |   | 18.3 |   |
| Total consolidated costs and expenses                 |   | $                               | 1,050.4 |   |   | $ | 919.5 |   |   | $ | 1,531.1 |   |

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Note 15.

|                                                                  |   | For the Year Ended December 31, |   |
|-----------------------------------------------------------------------|--------|---------------------------------|--------|
|                                                                  |   | 2010                            |   |   | 2009 |   |   | 2008 |   |
| Revenues:                                                             |   |                            |   |   |   |   |   |   |   |
| Revenues from EPO:                                                    |   |                            |   |   |   |   |   |   |   |
| Sales of natural gas                                                  |   | $                               | 139.2  |   |   | $ | 141.9 |   |   | $ | 177.3 |   |
| Natural gas transportation services                                   |   |                            | 113.8  |   |   |   | 56.4 |   |   |   | 51.5 |   |
| Natural gas storage services                                          |   |                            | 1.5    |   |   |   | 2.6 |   |   |   | 0.9 |   |
| Sales of NGLs                                                         |   |                            | 44.6   |   |   |   | 33.7 |   |   |   | 52.9 |   |
| NGL and petrochemical storage services                                |   |                            | 39.0   |   |   |   | 36.2 |   |   |   | 35.2 |   |
| NGL fractionation services                                            |   |                            | 30.8   |   |   |   | 32.0 |   |   |   | 29.7 |   |
| NGL transportation services                                           |   |                            | 32.7   |   |   |   | 28.6 |   |   |   | 30.4 |   |
| Sales of natural gas – Evangeline                               |   |                            | 174.5  |   |   |   | 155.5 |   |   |   | 362.9 |   |
| Natural gas transportation services – Energy Transfer Equity    |   |                            | 1.3    |   |   |   | 0.1 |   |   |   | 0.9 |   |
| NGL and petrochemical storage services – Energy Transfer Equity |   |                            | 0.4    |   |   |   | 0.3 |   |   |   | -- |   |
| Total related party revenues                                          |   | $                               | 577.8  |   |   | $ | 487.3 |   |   | $ | 741.7 |   |
|                                                                  |   |                            |   |   |   |   |   |   |   |   |   |   |
| Operating costs and expenses:                                         |   |                            |   |   |   |   |   |   |   |   |   |   |
| EPCO administrative services agreement                                |   | $                               | 87.2   |   |   | $ | 85.8 |   |   | $ | 72.1 |   |
| Expenses with EPO:                                                    |   |                            |   |   |   |   |   |   |   |   |   |   |
| Purchases of natural gas                                              |   |                            | 68.9   |   |   |   | 52.1 |   |   |   | 229.9 |   |
| Operational measurement losses (gains)                                |   |                            | (9.5   | ) |   |   | 1.7 |   |   |   | 6.8 |   |
| Other expenses with EPO                                               |   |                            | 16.8   |   |   |   | 16.4 |   |   |   | 18.4 |   |
| Purchases of natural gas – Nautilus                             |   |                            | 0.2    |   |   |   | 1.7 |   |   |   | 10.3 |   |
| Expenses with Energy Transfer Equity:                                 |   |                            |   |   |   |   |   |   |   |   |   |   |
| Purchases of natural gas                                              |   |                            | 11.0   |   |   |   | 5.7 |   |   |   | 7.3 |   |
| Operating cost reimbursements for shared facilities                   |   |                            | (4.1   | ) |   |   | (3.4 | ) |   |   | (2.8 | ) |
| Other expenses with Energy Transfer Equity (1)                        |   |                            | (0.5   | ) |   |   | (0.7 | ) |   |   | 3.1 |   |
| Total related party operating costs and expenses                      |   | $                               | 170.0  |   |   | $ | 159.3 |   |   | $ | 345.1 |   |
|                                                                  |   |                            |   |   |   |   |   |   |   |   |   |   |
| General and administrative costs:                                     |   |                            |   |   |   |   |   |   |   |   |   |   |
| EPCO administrative services agreement                                |   | $                               | 17.4   |   |   | $ | 10.9 |   |   | $ | 15.7 |   |
| Other related party general and administrative costs                  |   |                            | 0.1    |   |   |   | -- |   |   |   | (0.8 | ) |
| Total related party general and administrative costs                  |   | $                               | 17.5   |   |   | $ | 10.9 |   |   | $ | 14.9 |   |
|                                                                  |   |                            |   |   |   |   |   |   |   |   |   |   |
| Other income (expense) transactions:                                  |   |                            |   |   |   |   |   |   |   |   |   |   |
| Interest expense - Loan Agreement with EPO                            |   | $                               | (0.9   | ) |   | $ | -- |   |   | $ | -- |   |

|                                                                                                                                                                                                                                                                       |   | December 31, |   |   | December 31, |   |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|--------------|--------|--------|--------------|--------|
|                                                                                                                                                                                                                                                                       |   | 2010         |   |   | 2009         |   |
| Accounts receivable – related parties                                                                                                                                                                                                                                |   |         |   |   |         |   |
| EPO and affiliates (1)                                                                                                                                                                                                                                                     |   | $            | 19.5   |   |         | $      | 54.3 |   |
| Energy Transfer Equity and affiliates                                                                                                                                                                                                                                      |   |         | 1.6    |   |         |   | 0.2 |   |
| Total                                                                                                                                                                                                                                                                      |   | $            | 21.1   |   |         | $      | 54.5 |   |
|                                                                                                                                                                                                                                                                       |   |         |   |   |         |   |   |   |
| Accounts payable – related parties                                                                                                                                                                                                                                   |   |         |   |   |         |   |   |   |
| EPO and affiliates                                                                                                                                                                                                                                                         |   | $            | 13.6   |   |         | $      | 5.5 |   |
| EPCO and affiliates                                                                                                                                                                                                                                                        |   |         | 13.2   |   |         |   | 8.1 |   |
| Total                                                                                                                                                                                                                                                                      |   | $            | 26.8   |   |         | $      | 13.6 |   |
|                                                                                                                                                                                                                                                                       |   |         |   |   |         |   |   |   |
| (1)   In December 2009, EPO borrowed $45.6 million under a Master Intercompany Loan Agreement, which was subsequently repaid in January 2010. See “Significant Relationships and Agreements with EPO” within this Note 15 for more information. |   |

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| §   | EPO agreed to fund 100% of the post-February 5, 2007 capital expenditures incurred by South Texas NGL and Mont Belvieu Caverns with respect to certain expansion projects under construction at the time of our initial public offering; |
|--------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | EPO agreed to fund 100% of post-December 8, 2008 capital expenditures to complete the Sherman Extension natural gas pipeline (a component of our Texas Intrastate System); |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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| §   | EPO was granted a right of first refusal in our current and future subsidiaries and a right of first refusal on the material assets of such subsidiaries, other than sales of inventory and other assets in the ordinary course of business; |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | EPO was granted a preemptive right with respect to any equity securities issued by certain of our subsidiaries, other than those that may be issued as consideration in an acquisition or in connection with a loan or debt financing; |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Neither EPO nor any of its affiliates are restricted under the Omnibus Agreement from competing against us; |
|--------------------|-------------------------------------------------------------------------------------------------------------|

| §   | We and EPO agreed to negotiate in good faith any necessary amendments to the partnership or company agreements of the DEP II Midstream Businesses when either party believes that business circumstances have changed; and |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | Our general partner’s Audit, Conflicts and Governance Committee must approve amendments to the Omnibus Agreement when such amendments would adversely affect our unitholders. |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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| §   | EPCO will provide selling, general and administrative services, and management and operating services, as may be necessary to manage and operate our businesses, properties and assets (all in accordance with prudent industry practices).  EPCO will employ or otherwise retain the services of such personnel. |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | We are required to reimburse EPCO for its services in an amount equal to the sum of all costs and expenses incurred by EPCO which are directly or indirectly related to our business or activities (including expenses reasonably allocated to us by EPCO).  In addition, we have agreed to pay all sales, use, excise, value added or similar taxes, if any, that may be applicable from time to time in respect of the services provided to us by EPCO. |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | EPCO will allow us to participate as named insureds in its overall insurance program, with the associated premiums and other costs being allocated to us. |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------|

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|                                |   | For Year Ended December 31, |   |
|-------------------------------------|--------|-----------------------------|--------|
|                                |   | 2010                        |   |   | 2009 |   |   | 2008 |   |
| Operating costs and expenses        |   | $                           | 87.2   |   |   | $ | 85.8 |   |   | $ | 72.1 |   |
| General and administrative expenses |   |                        | 17.4   |   |   |   | 10.9 |   |   |   | 15.7 |   |
| Total costs and expenses            |   | $                           | 104.6  |   |   | $ | 96.7 |   |   | $ | 87.8 |   |

Note 16.

|                                                                                             |   | For the Year Ended December 31, |   |
|--------------------------------------------------------------------------------------------------|--------|---------------------------------|--------|
|                                                                                             |   | 2010                            |   |   | 2009 |   |   | 2008 |   |
| Total net income attributable to Duncan Energy Partners L.P.                                     |   | $                               | 90.1   |   |   | $ | 91.1 |   |   | $ | 47.9 |   |
| Less:  Income allocated to former owners of the DEP II Midstream Businesses            |   |                            | --     |   |   |   | -- |   |   |   | (19.6 | ) |
| Net income allocated to Duncan Energy Partners L.P. for purposesof determining earnings per unit |   |                            | 90.1   |   |   |   | 91.1 |   |   |   | 28.3 |   |
| Multiplied by DEP GP ownership interest (weighted-average for period)                            |   |                            | 0.7    | % |   |   | 0.7 | % |   |   | 1.7 | % |
| Net income allocation to DEP GP                                                                  |   | $                               | 0.6    |   |   | $ | 0.6 |   |   | $ | 0.5 |   |

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|                                                  |   | For the Year Ended December 31, |   |
|-------------------------------------------------------|--------|---------------------------------|--------|
|                                                  |   | 2010                            |   |   | 2009 |   |   | 2008 |   |
| Net income allocation to Duncan Energy Partners L.P.  |   | $                               | 90.1   |   |   | $ | 91.1 |   |   | $ | 28.3 |   |
| Less:  Income allocation to DEP GP          |   |                            | 0.6    |   |   |   | 0.6 |   |   |   | 0.5 |   |
| Net income allocation to limited partners             |   | $                               | 89.5   |   |   | $ | 90.5 |   |   | $ | 27.8 |   |
|                                                  |   |                            |   |   |   |   |   |   |   |   |   |   |
| Basic and diluted earnings per unit:                  |   |                            |   |   |   |   |   |   |   |   |   |   |
| Net income allocation to limited partners (numerator) |   | $                               | 89.5   |   |   | $ | 90.5 |   |   | $ | 27.8 |   |
| Weighted-average units outstanding: (denominator)     |   |                            |   |   |   |   |   |   |   |   |   |   |
| Common units                                          |   |                            | 57.7   |   |   |   | 54.5 |   |   |   | 20.3 |   |
| Class B units                                         |   |                            | --     |   |   |   | 3.2 |   |   |   | 2.5 |   |
| Total units                                           |   |                            | 57.7   |   |   |   | 57.7 |   |   |   | 22.8 |   |
|                                                  |   |                            |   |   |   |   |   |   |   |   |   |   |
| Basic and diluted earnings per unit                   |   | $                               | 1.55   |   |   | $ | 1.57 |   |   | $ | 1.22 |   |

Note 17

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|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |   | Payment or Settlement due by Period |    |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|-------------------------------------|---------|
| Contractual Obligations (1)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   | Total                               |    |   | 2011 |   |   | 2012 |   |   | 2013 |   |   | 2014 |   |   | 2015 |   |   | Thereafter |   |
| Scheduled maturities of debt obligations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |   | $                                   | 788.3   |   |   | $ | 282.3 |   |   | $ | -- |   |   | $ | 506.0 |   |   | $ | -- |   |   | $ | -- |   |   | $ | -- |   |
| Estimated cash interest payments (2)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |   | $                                   | 34.6    |   |   | $ | 14.1 |   |   | $ | 11.2 |   |   | $ | 9.3 |   |   | $ | -- |   |   | $ | -- |   |   | $ | -- |   |
| Operating lease obligations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   | $                                   | 107.2   |   |   | $ | 8.9 |   |   | $ | 8.7 |   |   | $ | 7.4 |   |   | $ | 6.6 |   |   | $ | 6.3 |   |   | $ | 69.3 |   |
| Purchase obligations:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |                                |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Product purchase commitments:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   |                                |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Estimated payment obligations:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |   |                                |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Natural gas                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   | $                                   | 294.9   |   |   | $ | 172.5 |   |   | $ | 122.4 |   |   | $ | -- |   |   | $ | -- |   |   | $ | -- |   |   | $ | -- |   |
| Other                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   | $                                   |  * |   |   | $ |  * |   |   | $ |  * |   |   | $ | -- |   |   | $ | -- |   |   | $ | -- |   |   | $ | -- |   |
| Underlying major volume commitments:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |   |                                |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Natural gas (in BBtus)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |                                | 69,959  |   |   |   | 40,926 |   |   |   | 29,033 |   |   |   | -- |   |   |   | -- |   |   |   | -- |   |   |   | -- |   |
| Capital expenditure commitments (3)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   | $                                   | 285.3   |   |   | $ | 285.3 |   |   | $ | -- |   |   | $ | -- |   |   | $ | -- |   |   | $ | -- |   |   | $ | -- |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |   |                                |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| * Amounts are negligible.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |   |
| (1)   The contractual obligations presented in this table reflect 100% of our subsidiaries’ obligations even though we own less than a 100% equity interest in our operating subsidiaries.(2)   Our estimated cash payments for interest are based on the principal amount of our consolidated debt obligations outstanding at December 31, 2010. In calculating these amounts, we applied the weighted-average variable interest rates paid during 2010 associated with such debt.(3)   Capital expenditure commitments are reflected on a consolidated basis before contributions, if any, from noncontrolling interest (e.g., contributions required in connection with the Caverns LLC Agreement and Amended Acadian LLC Agreement (see Note 15)). |   |

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| §   | We have long and short-term product purchase obligations for natural gas with third-party suppliers.  Our most significant product purchase obligation is a commitment that Acadian Gas has for the purchase of natural gas in Louisiana (see Note 9) that expires in January 2013.  The prices that we are obligated to pay under these contracts approximate market prices at the time we take delivery of the volumes.  The preceding table shows our volume commitments and estimated payment obligations under these contracts for the periods indicated.  Our estimated future payment obligations are based on the contractual price in each agreement at December 31, 2010 applied to all future volume commitments.  Actual future payment obligations may vary depending on market prices at the time of delivery.  At December 31, 2010, we do not have any significant product purchase commitments with fixed or minimum pricing provisions with remaining terms in excess of one year. |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| §   | We also have short-term payment obligations relating to our capital spending program.  These commitments represent unconditional payment obligations for services to be rendered or products to be delivered in connection with our capital projects.  At December 31, 2010, we had approximately $285.3 million of consolidated capital expenditure commitments outstanding, which primarily relate to the Haynesville Extension project (Acadian Gas) and Eagle Ford Shale projects (Texas Intrastate System).  See Note 15 for information regarding capital project funding arrangements with EPO. |
|--------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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Note 18.

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Note 19.

|                                                                                                         |   | For the Year Ended December 31, |   |
|--------------------------------------------------------------------------------------------------------------|--------|---------------------------------|--------|
|                                                                                                         |   | 2010                            |   |   | 2009 |   |   | 2008 |   |
| Decrease (increase) in:                                                                                      |   |                            |   |   |   |   |   |   |   |
| Accounts receivable - trade                                                                                  |   | $                               | 11.7   |   |   | $ | 39.6 |   |   | $ | 5.0 |   |
| Accounts receivable - related parties                                                                        |   |                            | (14.2  | ) |   |   | (9.9 | ) |   |   | 1.2 |   |
| Gas imbalance receivables                                                                                    |   |                            | (1.7   | ) |   |   | 25.9 |   |   |   | (1.4 | ) |
| Inventories                                                                                                  |   |                            | 4.7    |   |   |   | 17.5 |   |   |   | (6.0 | ) |
| Prepaid and other current assets                                                                             |   |                            | (3.6   | ) |   |   | (5.3 | ) |   |   | 1.6 |   |
| Increase (decrease) in:                                                                                      |   |                            |   |   |   |   |   |   |   |   |   |   |
| Accounts payable – trade                                                                               |   |                            | 9.5    |   |   |   | (1.7 | ) |   |   | (5.9 | ) |
| Accounts payable – related parties                                                                     |   |                            | 5.4    |   |   |   | (39.9 | ) |   |   | 13.5 |   |
| Accrued product payables                                                                                     |   |                            | 1.3    |   |   |   | (45.4 | ) |   |   | (8.7 | ) |
| Accrued taxes                                                                                                |   |                            | 1.8    |   |   |   | 0.9 |   |   |   | 6.4 |   |
| Other current liabilities                                                                                    |   |                            | 24.6   |   |   |   | (16.4 | ) |   |   | 5.1 |   |
| Other long-term liabilities                                                                                  |   |                            | --     |   |   |   | (0.2 | ) |   |   | (12.6 | ) |
| Net effect of changes in operating accounts                                                                  |   | $                               | 39.5   |   |   | $ | (34.9 | ) |   | $ | (1.8 | ) |
|                                                                                                         |   |                            |   |   |   |   |   |   |   |   |   |   |
| Cash payments for interest, net of $3.2, $0.3 and $0.3 capitalized in 2010, 2009 and 2008, respectively |   | $                               | 20.6   |   |   | $ | 13.8 |   |   | $ | 11.5 |   |
|                                                                                                         |   |                            |   |   |   |   |   |   |   |   |   |   |
| Cash payments for income taxes                                                                               |   | $                               | 0.6    |   |   | $ | 1.0 |   |   | $ | 0.2 |   |

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|                                              |   | For Year Ended December 31, |   |
|---------------------------------------------------|--------|-----------------------------|--------|
|                                              |   | 2010                        |   |   | 2009 |   |   | 2008 |   |
| Depreciation, amortization and accretion expense: |   |                        |   |   |   |   |   |   |   |
| DEP I Midstream Businesses                        |   | $                           | 42.9   |   |   | $ | 38.7 |   |   | $ | 34.3 |   |
| DEP II Midstream Businesses                       |   |                        | 161.6  |   |   |   | 147.4 |   |   |   | 133.1 |   |
| Other                                             |   |                        | 1.2    |   |   |   | 2.2 |   |   |   | 0.4 |   |
| Total                                             |   | $                           | 205.7  |   |   | $ | 188.3 |   |   | $ | 167.8 |   |

Note 20. 

|                                                                  |   | First   |   |   | Second  |   |   | Third   |   |   | Fourth  |   |
|-----------------------------------------------------------------------|--------|---------|--------|--------|---------|--------|--------|---------|--------|--------|---------|--------|
|                                                                  |   | Quarter |   |   | Quarter |   |   | Quarter |   |   | Quarter |   |
| For the Year Ended December 31, 2010:                                 |   |    |   |   |    |   |   |    |   |   |    |   |
| Revenues                                                              |   | $       | 290.6  |   |    | $      | 265.2  |    |   | $      | 283.7   |   |   | $ | 275.6 |   |
| Operating income                                                      |   |    | 18.7   |   |    |   | 15.3   |    |   |   | 9.1     |   |   |   | 22.4 |   |
| Net loss attributable to noncontrolling interest                      |   |    | 5.5    |   |    |   | 11.5   |    |   |   | 14.9    |   |   |   | 4.8 |   |
| Net income attributable to Duncan Energy Partners L.P.                |   |    | 21.2   |   |    |   | 23.3   |    |   |   | 20.6    |   |   |   | 25.0 |   |
|                                                                  |   |    |   |   |    |   |   |    |   |   |    |   |   |   |   |   |
| Allocation of net income attributable to Duncan Energy Partners L.P.: |   |    |   |   |    |   |   |    |   |   |    |   |   |   |   |   |
| Limited partners                                                      |   |    | 21.0   |   |    |   | 23.2   |    |   |   | 20.4    |   |   |   | 24.9 |   |
| General partner                                                       |   |    | 0.2    |   |    |   | 0.1    |    |   |   | 0.2     |   |   |   | 0.1 |   |
|                                                                  |   |    |   |   |    |   |   |    |   |   |    |   |   |   |   |   |
| Earnings per unit (basic and diluted)                                 |   |    | 0.37   |   |    |   | 0.40   |    |   |   | 0.36    |   |   |   | 0.43 |   |
|                                                                  |   |    |   |   |    |   |   |    |   |   |    |   |   |   |   |   |
| For the Year Ended December 31, 2009:                                 |   |    |   |   |    |   |   |    |   |   |    |   |   |   |   |   |
| Revenues                                                              |   | $       | 256.8  |   |    | $      | 226.7  |    |   | $      | 244.6   |   |   | $ | 251.2 |   |
| Operating income                                                      |   |    | 14.8   |   |    |   | 8.7    |    |   |   | 21.1    |   |   |   | 16.3 |   |
| Net loss attributable to noncontrolling interest                      |   |    | 8.9    |   |    |   | 18.7   |    |   |   | 7.0     |   |   |   | 10.7 |   |
| Net income attributable to Duncan Energy Partners L.P.                |   |    | 19.9   |   |    |   | 23.2   |    |   |   | 24.8    |   |   |   | 23.2 |   |
|                                                                  |   |    |   |   |    |   |   |    |   |   |    |   |   |   |   |   |
| Allocation of net income attributable to Duncan Energy Partners L.P.: |   |    |   |   |    |   |   |    |   |   |    |   |   |   |   |   |
| Limited partners                                                      |   |    | 19.8   |   |    |   | 23.0   |    |   |   | 24.6    |   |   |   | 23.1 |   |
| General partner                                                       |   |    | 0.1    |   |    |   | 0.2    |    |   |   | 0.2     |   |   |   | 0.1 |   |
|                                                                  |   |    |   |   |    |   |   |    |   |   |    |   |   |   |   |   |
| Earnings per unit (basic and diluted)                                 |   |    | 0.34   |   |    |   | 0.40   |    |   |   | 0.43    |   |   |   | 0.40 |   |

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Note 21.

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