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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

X Quarterly Report
Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended June 30, 2008

OR

Transition
Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from
 to .

Commission file number 1-12202

ONEOK PARTNERS, L.P.

(Exact name of registrant as specified in its charter)



|                                                               |  |                                     
|-------------------------------------------------------------- |  | ------------------------------------
|Delaware                                                       |  | 93-1120873                          
|(State or other jurisdiction of incorporation or organization) |  | (I.R.S. Employer Identification No.)
|                                                               | 
|100 West Fifth Street, Tulsa, OK                               |  | 74103                               
|(Address of principal executive offices)                       |  | (Zip Code)                          

Registrants telephone number, including area code (918) 588-7000

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities
Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes X  No

Indicate by checkmark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer,
or a smaller reporting company. See definition of large accelerated filer, accelerated filer and smaller reporting company in Rule 12b-2 of the Exchange Act.

Large accelerated filer X                Accelerated filer
                  Non-accelerated filer 
                Smaller reporting company__

Indicate by checkmark whether
the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes  No
X

Indicate the number of shares outstanding of each of the issuers classes of common stock, as of the latest practicable date.



|              |  |                             
|------------- |  | ----------------------------
|Class         |  | Outstanding at July 31, 2008
|Common units  |  | 54,426,087 units            
|Class B units |  | 36,494,126 units            



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ONEOK PARTNERS, L.P.

QUARTERLY REPORT ON FORM 10-Q



|          |  |                                                                                                                |  |         
|--------- |  | -------------------------------------------------------------------------------------------------------------- |  | --------
|          |  |                                                                                                               
|Part I.   |  | Financial Information                                                                                          |  | Page No.
|          |  |                                                                                                               
|Item 1.   |  | Financial Statements (Unaudited)                                                                               |  |         
|          |  |                                                                                                               
|          |  | Consolidated Statements of Income -Three and Six Months Ended June 30, 2008 and 2007                           |  | 5       
|          |  |                                                                                                               
|          |  | Consolidated Balance Sheets -June 30, 2008 and December 31, 2007                                               |  | 6       
|          |  |                                                                                                               
|          |  | Consolidated Statements of Cash Flows -Six Months Ended June 30, 2008 and 2007                                 |  | 7       
|          |  |                                                                                                               
|          |  | Consolidated Statement of Changes in Partners Equity andComprehensive Income - Six Months Ended June 30, 2008 |  | 8-9     
|          |  |                                                                                                               
|          |  | Notes to Consolidated Financial Statements                                                                     |  | 10-18   
|          |  |                                                                                                               
|Item 2.   |  | Managements Discussion and Analysis ofFinancial Condition and Results of Operations                           |  | 19-36   
|          |  |                                                                                                               
|Item 3.   |  | Quantitative and Qualitative Disclosures About Market Risk                                                     |  | 36-37   
|          |  |                                                                                                               
|Item 4.   |  | Controls and Procedures                                                                                        |  | 37      
|          |  |                                                                                                               
|Part II.  |  | Other Information                                                                                              |  |         
|          |  |                                                                                                               
|Item 1.   |  | Legal Proceedings                                                                                              |  | 38      
|          |  |                                                                                                               
|Item 1A.  |  | Risk Factors                                                                                                   |  | 38      
|          |  |                                                                                                               
|Item 2.   |  | Unregistered Sales of Equity Securities and Use of Proceeds                                                    |  | 38      
|          |  |                                                                                                               
|Item 3.   |  | Defaults Upon Senior Securities                                                                                |  | 38      
|          |  |                                                                                                               
|Item 4.   |  | Submission of Matters to a Vote of Security Holders                                                            |  | 38      
|          |  |                                                                                                               
|Item 5.   |  | Other Information                                                                                              |  | 38      
|          |  |                                                                                                               
|Item 6.   |  | Exhibits                                                                                                       |  | 38      
|          | 
|Signature |  | 39                                                                                                            

As used in this Quarterly Report on Form 10-Q, we, our, us or the
Partnership refers to ONEOK Partners, L.P. and its subsidiary, ONEOK Partners Intermediate Limited Partnership and its subsidiaries, unless the context indicates otherwise.

The statements in this Quarterly Report on Form 10-Q that are not historical information, including statements concerning plans and objectives of management for future operations, economic performance or related
assumptions, are forward-looking statements. Forward-looking statements may include words such as anticipate, estimate, expect, project, intend, plan, believe,
should, goal, forecast, could, may, continue, might, potential, scheduled and other words and terms of similar meaning. Although we believe
that our expectations regarding future events are based on reasonable assumptions, we can give no assurance that our goals will be achieved. Important factors that could cause actual results to differ materially from those in the forward-looking
statements are described under Part I, Item 2, Managements Discussion and Analysis of Financial Condition and Results of Operations, Forward-Looking Statements in this Quarterly Report on Form 10-Q and under Part I,
Item 1A, Risk Factors, in our Annual Report on Form 10-K for the year ended December 31, 2007.



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GLOSSARY

The abbreviations, acronyms and industry terminology used in this Quarterly Report are defined as follows:



|                               |  |                                                                                                                                     
|------------------------------ |  | ------------------------------------------------------------------------------------------------------------------------------------
|AFUDC                          |  | Allowance for funds used during construction                                                                                        
|ARB                            |  | Accounting Research Bulletin                                                                                                        
|Bbl                            |  | Barrels, 1 barrel is equivalent to 42 United States gallons                                                                         
|Bbl/d                          |  | Barrels per day                                                                                                                     
|BBtu/d                         |  | Billion British thermal units per day                                                                                               
|Btu                            |  | British thermal units, a measure of the amount of heat required to raise the temperature of one pound of water one degree
Fahrenheit
|Bushton Plant                  |  | Bushton Gas Processing Plant                                                                                                        
|EITF                           |  | Emerging Issues Task Force                                                                                                          
|Exchange Act                   |  | Securities Exchange Act of 1934, as amended                                                                                         
|FASB                           |  | Financial Accounting Standards Board                                                                                                
|FERC                           |  | Federal Energy Regulatory Commission                                                                                                
|FIN                            |  | FASB Interpretation                                                                                                                 
|Fort Union Gas Gathering       |  | Fort Union Gas Gathering, L.L.C.                                                                                                    
|GAAP                           |  | Generally Accepted Accounting Principles in the United States                                                                       
|Guardian Pipeline              |  | Guardian Pipeline, L.L.C.                                                                                                           
|Heartland                      |  | Heartland Pipeline Company                                                                                                          
|KCC                            |  | Kansas Corporation Commission                                                                                                       
|KDHE                           |  | Kansas Department of Health and Environment                                                                                         
|MBbl                           |  | Thousand barrels                                                                                                                    
|MBbl/d                         |  | Thousand barrels per day                                                                                                            
|Midwestern Gas Transmission    |  | Midwestern Gas Transmission Company                                                                                                 
|MMBtu                          |  | Million British thermal units                                                                                                       
|MMBtu/d                        |  | Million British thermal units per day                                                                                               
|MMcf/d                         |  | Million cubic feet per day                                                                                                          
|Moodys                        |  | Moodys Investors Service, Inc.                                                                                                     
|NBP Services                   |  | NBP Services, LLC, a subsidiary of ONEOK                                                                                            
|NGL(s)                         |  | Natural gas liquid(s)                                                                                                               
|Northern Border Pipeline       |  | Northern Border Pipeline Company                                                                                                    
|NYMEX                          |  | New York Mercantile Exchange                                                                                                        
|OBPI                           |  | ONEOK Bushton Processing Inc.                                                                                                       
|OCC                            |  | Oklahoma Corporation Commission                                                                                                     
|OkTex Pipeline                 |  | OkTex Pipeline Company, L.L.C.                                                                                                      
|ONEOK                          |  | ONEOK, Inc.                                                                                                                         
|ONEOK Partners GP              |  | ONEOK Partners GP, L.L.C., a wholly owned subsidiary of ONEOK, Inc. and our sole general partner                                    
|Overland Pass Pipeline Company |  | Overland Pass Pipeline Company LLC                                                                                                  
|Partnership Agreement          |  | Third Amended and Restated Agreement of Limited Partnership of ONEOK Partners, L.P., as amended                                     
|S&P                            |  | Standard & Poors Rating Group                                                                                                      
|SEC                            |  | Securities and Exchange Commission                                                                                                  
|Statement                      |  | Statement of Financial Accounting Standards                                                                                         



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PART IFINANCIAL INFORMATION

ITEM 
1. FINANCIAL STATEMENTS

ONEOK Partners, L.P. and Subsidiaries

CONSOLIDATED STATEMENTS OF INCOME



|                                                          |  |                                                 |           |   |                          |   |           |      |  |   |           |   |  |   |           |   |  | 
|--------------------------------------------------------- |  | ----------------------------------------------- | --------- | - | ------------------------ | - | --------- | ---- |  | - | --------- | - |  | - | --------- | - |  | 
|                                                          |  | Three Months EndedJune 30,                      |           |   | Six Months EndedJune 30, |   |           |     
|(Unaudited)                                               |  | 2008                                            |           |   | 2007                     |   |           | 2008 |  |   | 2007      |   |  |  
|                                                          |  | (Thousands of dollars, except per unit amounts) |           |   |                         
|Revenues                                                  |  | $                                               | 2,143,892 |   |                          | $ | 1,375,314 |      |  | $ | 4,202,927 |   |  | $ | 2,543,988 |   |  | 
|Cost of sales and fuel                                    |  |                                                 | 1,862,959 |   |                          |   | 1,157,744 |      |  |   | 3,653,469 |   |  |   | 2,121,048 |   |  | 
|Net Margin                                                |  |                                                 | 280,933   |   |                          |   | 217,570   |      |  |   | 549,458   |   |  |   | 422,940   |   |  | 
|Operating Expenses                                        |  |                                                 |           |   |                          |   |           |      |  |   |           |   |  |   |           |   |  | 
|Operations and maintenance                                |  |                                                 | 80,532    |   |                          |   | 74,371    |      |  |   | 157,473   |   |  |   | 141,047   |   |  | 
|Depreciation and amortization                             |  |                                                 | 30,033    |   |                          |   | 28,013    |      |  |   | 59,975    |   |  |   | 55,526    |   |  | 
|General taxes                                             |  |                                                 | 6,626     |   |                          |   | 7,249     |      |  |   | 17,767    |   |  |   | 16,257    |   |  | 
|Total Operating Expenses                                  |  |                                                 | 117,191   |   |                          |   | 109,633   |      |  |   | 235,215   |   |  |   | 212,830   |   |  | 
|Gain (Loss) on Sale of Assets                             |  |                                                 | (3        | ) |                          |   | (379      | )    |  |   | 28        |   |  |   | 1,824     |   |  | 
|Operating Income                                          |  |                                                 | 163,739   |   |                          |   | 107,558   |      |  |   | 314,271   |   |  |   | 211,934   |   |  | 
|Equity earnings from investments (Note J)                 |  |                                                 | 17,610    |   |                          |   | 18,758    |      |  |   | 45,393    |   |  |   | 42,813    |   |  | 
|Allowance for equity funds used during construction       |  |                                                 | 11,676    |   |                          |   | 1,658     |      |  |   | 20,172    |   |  |   | 2,995     |   |  | 
|Other income                                              |  |                                                 | 676       |   |                          |   | 2,502     |      |  |   | 2,734     |   |  |   | 3,965     |   |  | 
|Other expense                                             |  |                                                 | (36       | ) |                          |   | (298      | )    |  |   | (2,167    | ) |  |   | (511      | ) |  | 
|Interest expense                                          |  |                                                 | (34,705   | ) |                          |   | (33,503   | )    |  |   | (73,234   | ) |  |   | (65,803   | ) |  | 
|Income before Minority Interests and Income Taxes         |  |                                                 | 158,960   |   |                          |   | 96,675    |      |  |   | 307,169   |   |  |   | 195,393   |   |  | 
|Minority interests in income of consolidated subsidiaries |  |                                                 | (134      | ) |                          |   | (92       | )    |  |   | (257      | ) |  |   | (177      | ) |  | 
|Income taxes                                              |  |                                                 | (4,305    | ) |                          |   | (1,964    | )    |  |   | (7,373    | ) |  |   | (4,841    | ) |  | 
|Net Income                                                |  | $                                               | 154,521   |   |                          | $ | 94,619    |      |  | $ | 299,539   |   |  | $ | 190,375   |   |  | 
|                                                         
|Limited partners interest in net income:                 |  |                                                 |           |   |                          |   |           |      |  |   |           |   |  |   |           |   |  | 
|Net income                                                |  | $                                               | 154,521   |   |                          | $ | 94,619    |      |  | $ | 299,539   |   |  | $ | 190,375   |   |  | 
|General partners interest in net income                  |  |                                                 | (21,688   | ) |                          |   | (14,052   | )    |  |   | (41,393   | ) |  |   | (27,330   | ) |  | 
|Limited Partners Interest in Net Income                  |  | $                                               | 132,833   |   |                          | $ | 80,567    |      |  | $ | 258,146   |   |  | $ | 163,045   |   |  | 
|                                                         
|Limited partners per unit net income:                    |  |                                                 |           |   |                          |   |           |      |  |   |           |   |  |   |           |   |  | 
|Net income per unit (Note K)                              |  | $                                               | 1.46      |   |                          | $ | 0.97      |      |  | $ | 2.94      |   |  | $ | 1.97      |   |  | 
|                                                         
|Number of Units Used in Computation (Thousands)           |  |                                                 | 90,906    |   |                          |   | 82,891    |      |  |   | 87,680    |   |  |   | 82,891    |   |  | 
|                                                         

See accompanying Notes to Consolidated Financial Statements.



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ONEOK Partners, L.P. and Subsidiaries

CONSOLIDATED BALANCE SHEETS



|                                                                                                                                 |  |                        |           |   |                  |   |           |   |  | 
|-------------------------------------------------------------------------------------------------------------------------------- |  | ---------------------- | --------- | - | ---------------- | - | --------- | - |  | 
|(Unaudited)                                                                                                                      |  | June 30,2008           |           |   | December 31,2007 |   |           |  
|Assets                                                                                                                           |  | (Thousands of dollars) |           |   |                 
|Current Assets                                                                                                                   |  |                        |           |   |                  |   |           |   |  | 
|Cash and cash equivalents                                                                                                        |  | $                      | 76,410    |   |                  | $ | 3,213     |   |  | 
|Accounts receivable, net                                                                                                         |  |                        | 538,185   |   |                  |   | 577,989   |   |  | 
|Affiliate receivables                                                                                                            |  |                        | 67,294    |   |                  |   | 52,479    |   |  | 
|Gas and natural gas liquids in storage                                                                                           |  |                        | 331,460   |   |                  |   | 251,219   |   |  | 
|Commodity exchanges and imbalances                                                                                               |  |                        | 154,359   |   |                  |   | 82,037    |   |  | 
|Other current assets                                                                                                             |  |                        | 24,934    |   |                  |   | 19,961    |   |  | 
|Total Current Assets                                                                                                             |  |                        | 1,192,642 |   |                  |   | 986,898   |   |  | 
|                                                                                                                                 |  |                        |          
|Property, Plant and Equipment                                                                                                    |  |                        |           |   |                  |   |           |   |  | 
|Property, plant and equipment                                                                                                    |  |                        | 5,040,688 |   |                  |   | 4,436,371 |   |  | 
|Accumulated depreciation and amortization                                                                                        |  |                        | 826,762   |   |                  |   | 776,185   |   |  | 
|Net Property, Plant and Equipment (Note A)                                                                                       |  |                        | 4,213,926 |   |                  |   | 3,660,186 |   |  | 
|                                                                                                                                 |  |                        |          
|Investments and Other Assets                                                                                                     |  |                        |           |   |                  |   |           |   |  | 
|Investment in unconsolidated affiliates (Note J)                                                                                 |  |                        | 752,952   |   |                  |   | 756,260   |   |  | 
|Goodwill and intangible assets                                                                                                   |  |                        | 680,369   |   |                  |   | 682,084   |   |  | 
|Other assets                                                                                                                     |  |                        | 29,651    |   |                  |   | 26,637    |   |  | 
|Total Investments and Other Assets                                                                                               |  |                        | 1,462,972 |   |                  |   | 1,464,981 |   |  | 
|Total Assets                                                                                                                     |  | $                      | 6,869,540 |   |                  | $ | 6,112,065 |   |  | 
|                                                                                                                                
|                                                                                                                                 |  |                        |          
|Liabilities and Partners Equity                                                                                                 |  |                        |           |   |                  |   |           |   |  | 
|                                                                                                                                 |  |                        |          
|Current Liabilities                                                                                                              |  |                        |           |   |                  |   |           |   |  | 
|Current maturities of long-term debt                                                                                             |  | $                      | 11,931    |   |                  | $ | 11,930    |   |  | 
|Notes payable                                                                                                                    |  |                        | 120,000   |   |                  |   | 100,000   |   |  | 
|Accounts payable                                                                                                                 |  |                        | 814,638   |   |                  |   | 742,903   |   |  | 
|Affiliate payables                                                                                                               |  |                        | 52,856    |   |                  |   | 18,298    |   |  | 
|Commodity exchanges and imbalances                                                                                               |  |                        | 379,619   |   |                  |   | 252,095   |   |  | 
|Other current liabilities                                                                                                        |  |                        | 136,121   |   |                  |   | 136,664   |   |  | 
|Total Current Liabilities                                                                                                        |  |                        | 1,515,165 |   |                  |   | 1,261,890 |   |  | 
|                                                                                                                                 |  |                        |          
|Long-term Debt, excluding current maturities                                                                                     |  |                        | 2,597,453 |   |                  |   | 2,605,396 |   |  | 
|                                                                                                                                 |  |                        |          
|Deferred Credits and Other Liabilities                                                                                           |  |                        | 47,682    |   |                  |   | 43,799    |   |  | 
|                                                                                                                                 |  |                        |          
|Commitments and Contingencies (Note H)                                                                                           |  |                        |           |   |                  |   |           |   |  | 
|                                                                                                                                 |  |                        |          
|Minority Interests in Consolidated Subsidiaries                                                                                  |  |                        | 5,911     |   |                  |   | 5,802     |   |  | 
|                                                                                                                                 |  |                        |          
|Partners Equity                                                                                                                 |  |                        |           |   |                  |   |           |   |  | 
|General partner                                                                                                                  |  |                        | 74,043    |   |                  |   | 58,415    |   |  | 
|Common units: 54,426,087 units and 46,397,214 units issued and outstanding at June 30, 2008, and December 31, 2007, respectively |  |                        | 1,310,567 |   |                  |   | 814,266   |   |  | 
|Class B units: 36,494,126 units issued and outstanding at June 30, 2008, and December 31, 2007                                   |  |                        | 1,373,160 |   |                  |   | 1,340,638 |   |  | 
|Accumulated other comprehensive income (loss) (Note E)                                                                           |  |                        | (54,441   | ) |                  |   | (18,141   | ) |  | 
|Total Partners Equity                                                                                                           |  |                        | 2,703,329 |   |                  |   | 2,195,178 |   |  | 
|Total Liabilities and Partners Equity                                                                                           |  | $                      | 6,869,540 |   |                  | $ | 6,112,065 |   |  | 
|                                                                                                                                

See accompanying Notes to Consolidated Financial Statements.



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ONEOK Partners, L.P. and Subsidiaries

CONSOLIDATED STATEMENTS OF CASH FLOWS



|                                                                                |  |                          |          |   |      |   |          |   |  | 
|------------------------------------------------------------------------------- |  | ------------------------ | -------- | - | ---- | - | -------- | - |  | 
|                                                                                |  | Six Months EndedJune 30, |          |   |     
|(Unaudited)                                                                     |  | 2008                     |          |   | 2007 |   |          |  
|Operating Activities                                                            |  | (Thousands of dollars)   |          |   |     
|Net income                                                                      |  | $                        | 299,539  |   |      | $ | 190,375  |   |  | 
|Depreciation and amortization                                                   |  |                          | 59,975   |   |      |   | 55,526   |   |  | 
|Allowance for equity funds used during construction                             |  |                          | (20,172  | ) |      |   | (2,995   | ) |  | 
|Gain on sale of assets                                                          |  |                          | (28      | ) |      |   | (1,824   | ) |  | 
|Minority interests in income of consolidated subsidiaries                       |  |                          | 257      |   |      |   | 177      |   |  | 
|Equity earnings from investments                                                |  |                          | (45,393  | ) |      |   | (42,813  | ) |  | 
|Distributions received from unconsolidated affiliates                           |  |                          | 39,904   |   |      |   | 57,066   |   |  | 
|Changes in assets and liabilities (net of acquisition and disposition effects): |  |                          |          |   |      |   |          |   |  | 
|Accounts receivable                                                             |  |                          | 35,134   |   |      |   | (69,680  | ) |  | 
|Affiliate receivables                                                           |  |                          | (14,815  | ) |      |   | 21,468   |   |  | 
|Gas and natural gas liquids in storage                                          |  |                          | (104,557 | ) |      |   | 8,637    |   |  | 
|Accounts payable                                                                |  |                          | 39,225   |   |      |   | 140,858  |   |  | 
|Affiliate payables                                                              |  |                          | 34,558   |   |      |   | (10,130  | ) |  | 
|Commodity exchanges and imbalances, net                                         |  |                          | 55,202   |   |      |   | 14,888   |   |  | 
|Other assets and liabilities                                                    |  |                          | (48,886  | ) |      |   | 3,407    |   |  | 
|Cash Provided by Operating Activities                                           |  |                          | 329,943  |   |      |   | 364,960  |   |  | 
|Investing Activities                                                            |  |                          |          |   |      |   |          |   |  | 
|Changes in investments in unconsolidated affiliates                             |  |                          | 6,480    |   |      |   | (7,653   | ) |  | 
|Capital expenditures (less allowance for equity funds used during construction) |  |                          | (524,587 | ) |      |   | (206,391 | ) |  | 
|Proceeds from sale of assets                                                    |  |                          | 111      |   |      |   | 3,753    |   |  | 
|Changes in short-term investments                                               |  |                          |         |   |      |   | (26,038  | ) |  | 
|Other                                                                           |  |                          | 2,450    |   |      |   |         |   |  | 
|Cash Used in Investing Activities                                               |  |                          | (515,546 | ) |      |   | (236,329 | ) |  | 
|Financing Activities                                                            |  |                          |          |   |      |   |          |   |  | 
|Cash distributions to:                                                          |  |                          |          |   |      |   |          |   |  | 
|General and limited partners                                                    |  |                          | (214,794 | ) |      |   | (189,008 | ) |  | 
|Minority interests                                                              |  |                          | (148     | ) |      |   | (73      | ) |  | 
|Borrowing (repayment) of notes payable, net                                     |  |                          | 20,000   |   |      |   | 99,000   |   |  | 
|Issuance of common units, net of discounts                                      |  |                          | 450,198  |   |      |   |         |   |  | 
|Contributions from general partner                                              |  |                          | 9,508    |   |      |   |         |   |  | 
|Payment of long-term debt                                                       |  |                          | (5,964   | ) |      |   | (2,983   | ) |  | 
|Other                                                                           |  |                          |         |   |      |   | (30      | ) |  | 
|Cash Provided by (Used in) Financing Activities                                 |  |                          | 258,800  |   |      |   | (93,094  | ) |  | 
|Change in Cash and Cash Equivalents                                             |  |                          | 73,197   |   |      |   | 35,537   |   |  | 
|Cash and Cash Equivalents at Beginning of Period                                |  |                          | 3,213    |   |      |   | 21,102   |   |  | 
|Cash and Cash Equivalents at End of Period                                      |  | $                        | 76,410   |   |      | $ | 56,639   |   |  | 
|                                                                               

See accompanying Notes to Consolidated Financial Statements.



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ONEOK Partners, L.P. and Subsidiaries

CONSOLIDATED STATEMENT OF CHANGES IN PARTNERS EQUITY AND COMPREHENSIVE INCOME









|                                           |  |             |  |                        |  |                |         |   |              |   |           |   |  | 
|------------------------------------------ |  | ----------- |  | ---------------------- |  | -------------- | ------- | - | ------------ | - | --------- | - |  | 
|(Unaudited)                                |  | CommonUnits |  | Class BUnits           |  | GeneralPartner |         |   | Common Units |   |           |  
|                                           |  | (Units)     |  | (Thousands of dollars) |  |                |        
|December 31, 2007                          |  | 46,397,214  |  | 36,494,126             |  | $              | 58,415  |   |              | $ | 814,266   |   |  | 
|Net income                                 |  | -           |  | -                      |  |                | 41,393  |   |              |   | 150,263   |   |  | 
|Other comprehensive income (loss) (Note E) |  | -           |  | -                      |  |                | -       |   |              |   | -         |   |  | 
|Total comprehensive income                 |  |             |  |                        |  |                |         |   |              |   |           |   |  | 
|Issuance of common units (Note F)          |  | 8,028,873   |  | -                      |  |                | -       |   |              |   | 450,198   |   |  | 
|Contribution from general partner (Note F) |  | -           |  | -                      |  |                | 9,508   |   |              |   | -         |   |  | 
|Distributions paid (Note K)                |  | -           |  | -                      |  |                | (35,273 | ) |              |   | (104,160  | ) |  | 
|June 30, 2008                              |  | 54,426,087  |  | 36,494,126             |  | $              | 74,043  |   |              | $ | 1,310,567 |   |  | 
|                                          

See accompanying Notes to Consolidated Financial Statements.



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##### Table of Contents

ONEOK Partners, L.P. and Subsidiaries

CONSOLIDATED STATEMENT OF CHANGES IN PARTNERS EQUITY AND COMPREHENSIVE INCOME

(Continued)



|                                           |  |                        |           |   |                                               |   |         |   |  |                       |  |   |           |   |  | 
|------------------------------------------ |  | ---------------------- | --------- | - | --------------------------------------------- | - | ------- | - |  | --------------------- |  | - | --------- | - |  | 
|                                           |  | Class B Units          |           |   | Accumulated Other Comprehensive Income (Loss) |   |         |   |  | Total PartnersEquity |  |   |          
|                                           |  | (Thousands of dollars) |           |   |                                              
|December 31, 2007                          |  | $                      | 1,340,638 |   |                                               | $ | (18,141 | ) |  |                       |  | $ | 2,195,178 |   |  | 
|Net income                                 |  |                        | 107,883   |   |                                               |   | -       |   |  |                       |  |   | 299,539   |   |  | 
|Other comprehensive income (loss) (Note E) |  |                        | -         |   |                                               |   | (36,300 | ) |  |                       |  |   | (36,300   | ) |  | 
|                                           |  |                        |           |   |                                               |   |         |   |  |                       |  |   |           |   |  | 
|Total comprehensive income                 |  |                        |           |   |                                               |   |         |   |  |                       |  |   | 263,239   |   |  | 
|                                           |  |                        |           |   |                                               |   |         |   |  |                       |  |   |           |   |  | 
|Issuance of common units (Note F)          |  |                        | -         |   |                                               |   | -       |   |  |                       |  |   | 450,198   |   |  | 
|Contribution from general partner (Note F) |  |                        | -         |   |                                               |   | -       |   |  |                       |  |   | 9,508     |   |  | 
|Distributions paid (Note K)                |  |                        | (75,361   | ) |                                               |   | -       |   |  |                       |  |   | (214,794  | ) |  | 
|June 30, 2008                              |  | $                      | 1,373,160 |   |                                               | $ | (54,441 | ) |  |                       |  | $ | 2,703,329 |   |  | 
|                                          



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ONEOK Partners, L.P. and Subsidiaries

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)



|A. | SUMMARY OF ACCOUNTING POLICIES
|-- | ------------------------------

Our accompanying unaudited
consolidated financial statements have been prepared in accordance with GAAP and reflect all adjustments that, in our opinion, are necessary for a fair presentation of the results for the interim periods presented. All such adjustments are of a
normal recurring nature. These unaudited consolidated financial statements should be read in conjunction with our audited consolidated financial statements in our Annual Report on Form 10-K for the year ended December 31, 2007.

In July 2007, we announced a series of organizational changes that led to the realignment of our previous business segments. Our financial results are now reported in
these four segments: (i) Natural Gas Gathering and Processing, which remains unchanged; (ii) Natural Gas Pipelines, which is comprised of our former interstate natural gas pipelines segment and the natural gas assets of our former
pipelines and storage segment; (iii) Natural Gas Liquids Gathering and Fractionation, which remains unchanged; and (iv) Natural Gas Liquids Pipelines, which is comprised of the natural gas liquids assets of our former pipelines and storage
segment. Prior periods have been restated to reflect these segment changes.

Our accounting policies are consistent with those disclosed in Note A of the
Notes to Consolidated Financial Statements in our Annual Report on Form 10-K for the year ended December 31, 2007.

Significant Accounting Policies

Property - The following table sets forth our property, by segment, for the periods presented.



|                                                |  |                        |           |                  |   |          
|----------------------------------------------- |  | ---------------------- | --------- | ---------------- | - | ---------
|                                                |  | June 30,2008           |           | December 31,2007
|                                                |  | (Thousands of dollars)
|Non-Regulated                                   |  |                        |           |                  |   |          
|Natural Gas Gathering and Processing            |  | $                      | 1,293,906 |                  | $ | 1,227,475
|Natural Gas Pipelines                           |  |                        | 163,923   |                  |   | 162,390  
|Natural Gas Liquids Gathering and Fractionation |  |                        | 789,475   |                  |   | 672,047  
|Other                                           |  |                        | 50,400    |                  |   | 50,482   
|Regulated                                       |  |                        |           |                  |   |          
|Natural Gas Pipelines                           |  |                        | 1,240,383 |                  |   | 1,184,112
|Natural Gas Liquids Pipelines                   |  |                        | 1,502,601 |                  |   | 1,139,865
|Property, plant and equipment                   |  |                        | 5,040,688 |                  |   | 4,436,371
|Accumulated depreciation and amortization       |  |                        | 826,762   |                  |   | 776,185  
|Net property, plant and equipment               |  | $                      | 4,213,926 |                  | $ | 3,660,186
|                                               

At June 30, 2008, property, plant and equipment on our Consolidated Balance Sheets included construction work
in process of $1.2 billion that had not yet been put in service and therefore was not being depreciated.

Other

Fair Value Measurements - In September 2006, the FASB issued Statement 157, Fair Value Measurements, which establishes a framework for measuring fair
value and requires additional disclosures about fair value measurements. Beginning January 1, 2008, we partially applied Statement 157 as allowed by FASB Staff Position (FSP) 157-2, which delayed the effective date of Statement 157 for
nonrecurring fair value measurements associated with our nonfinancial assets and liabilities. As of January 1, 2008, we applied the provisions of Statement 157 to our recurring fair value measurements, and the impact was not material. See Note
C for disclosures of fair value measurements for our financial instruments. Under FSP 157-2, we will be required to apply Statement 157 to our nonrecurring fair value measurements associated with our nonfinancial assets and liabilities beginning
January 1, 2009. We are currently reviewing the impact of Statement 157 to our nonrecurring fair value measurements associated with our nonfinancial assets and liabilities, as well as the potential impact on our consolidated financial
statements.



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In February 2007, the FASB issued Statement 159, The Fair Value Option for Financial Assets and Financial
Liabilities, which allows companies to elect to measure specified financial assets and liabilities, firm commitments, and nonfinancial warranty and insurance contracts at fair value on a contract-by-contract basis, with changes in fair value
recognized in earnings each reporting period. At January 1, 2008, we did not elect the fair value option under Statement 159 and therefore there was no impact on our consolidated financial statements.

Master Netting Arrangements - In April 2007, the FASB issued Staff Position No. FIN 39-1, Amendment of FASB Interpretation No. 39, which requires
entities that offset the fair value amounts recognized for derivative receivables and payables to also offset the fair value amounts recognized for the right to reclaim cash collateral with the same counterparty under a master netting agreement. We
applied the provisions of FIN 39-1 to our consolidated financial statements beginning January 1, 2008, and the impact was not material. See Note C for applicable disclosures.

Business Combinations - In December 2007, the FASB issued Statement 141R, Business Combinations, which will require most identifiable assets, liabilities, noncontrolling interest (previously
referred to as minority interest) and goodwill acquired in a business combination to be recorded at fair value. Statement 141R is effective for our year beginning January 1, 2009, and will be applied prospectively. Based upon our initial review
of Statement 141R, there is no impact on our current consolidated financial statements.

Noncontrolling Interests - In December 2007, the FASB
issued Statement 160, Noncontrolling Interests in Consolidated Financial Statements - an amendment of ARB No. 51, which requires noncontrolling interest (previously referred to as minority interest) to be reported as a component of
equity. Statement 160 is effective for our year beginning January 1, 2009, and will require retroactive adoption of the presentation and disclosure requirements for existing minority interests. Based upon our initial review of Statement 160, we
do not expect the provisions of Statement 160 to have a material impact on our consolidated financial statements; however, certain financial statement presentation changes and additional required disclosures will be applicable to us.

Derivative Instruments and Hedging Activities Disclosure - In March 2008, the FASB issued Statement 161, Disclosures about Derivative Instruments and
Hedging Activities - an amendment to FASB Statement No. 133, which requires enhanced disclosures about how derivative and hedging activities affect our financial position, financial performance and cash flows. Statement 161 is effective
for our year beginning January 1, 2009, and will be applied prospectively. We are currently reviewing the applicability of Statement 161 to our consolidated financial statement disclosures.

Net Income Per Unit - The FASB ratified EITF 07-4, Application of the Two-Class Method under FASB Statement No. 128 to Master Limited
Partnerships, in March 2008. EITF 07-4 results in the allocation of undistributed current-period earnings to the unitholders using the two-class method in periods in which earnings exceed distributions. When distributions to
participating securities exceed current-period earnings, the excess distributions generate an undistributed loss that would be allocated back to the equity interests based on the contractual terms of the partnership agreement. EITF 07-4 is
effective for our year beginning January 1, 2009, and requires retrospective application. We are currently reviewing the applicability of EITF 07-4 to our net income-per-unit computations.

Reclassifications - Certain amounts in our consolidated financial statements have been reclassified to conform to the 2008 presentation. These reclassifications
did not impact previously reported net income or partners equity.



|B. | ACQUISITION
|-- | -----------

In October 2007, we completed the acquisition of an
interstate natural gas liquids and refined petroleum products pipeline system and related assets from a subsidiary of Kinder Morgan Energy Partners, L.P. for approximately $300 million, before working capital adjustments. The system extends from
Bushton and Conway, Kansas, to Chicago, Illinois, and transports, stores and delivers a full range of NGL and refined petroleum products. The FERC-regulated system spans 1,624 miles and has a capacity to transport up to 134 MBbl/d. The transaction
included approximately 978 MBbl of owned storage capacity, eight NGL terminals and a 50 percent ownership of Heartland. ConocoPhillips owns the other 50 percent of Heartland and is the managing partner of the Heartland joint venture, which consists
primarily of three refined petroleum products terminals and connecting pipelines. Our investment in Heartland is accounted for under the equity method of accounting. Financing for this transaction came from a portion of the proceeds of our September
2007 issuance of $600 million 6.85 percent Senior Notes due 2037. The working capital settlement was finalized in April 2008, with no material adjustments.



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##### Table of Contents

|C. | FAIR VALUE MEASUREMENTS
|-- | -----------------------

As discussed in Note A, we applied the
provisions of Statement 157 as of January 1, 2008, to our recurring fair value measurements.

Determining Fair Value - Statement 157 defines
fair value as the price that would be received to sell an asset or transfer a liability in an orderly transaction between market participants at the measurement date. We use the market and income approaches to determine the fair value of our assets
and liabilities and consider the markets in which the transactions are executed. While many of the contracts in our portfolio are executed in liquid markets where price transparency exists, some contracts are executed in markets for which
market prices may exist but the market may be relatively inactive. This results in limited price transparency that requires managements judgment and assumptions to estimate fair values. For certain transactions, we utilize modeling
techniques using NYMEX-settled pricing data and historical correlations of NGL product prices to crude oil. We validate our valuation inputs with third-party information and settlement prices from other sources where available. In addition, as
prescribed by the income approach, we compute the fair value of our derivative portfolio by discounting the projected future cash flows from our derivative assets and liabilities to present value. The interest rate yields used to calculate the
present value discount factors are derived from London Interbank Offered Rate (LIBOR), Eurodollar futures and Treasury swaps. The projected cash flows are then multiplied by the appropriate discount factors to determine the present value or
fair value of our derivative instruments. Finally, we consider the credit risk of our counterparties with whom our derivative assets and liabilities are executed. Although we use our best estimates to determine the fair value of the
derivative contracts we have executed, the ultimate market prices realized could differ from our estimates, and the differences could be significant.

Fair Value Hierarchy - Statement 157 establishes the fair value hierarchy that prioritizes inputs to valuation techniques based on observable and unobservable data and categorizes the inputs into three levels, with the highest
priority given to Level 1 and the lowest priority given to Level 3. The levels are described below.

| |  |  | Level 1 - Unadjusted quoted prices in active markets for identical assets or liabilities.
| | - |  | -----------------------------------------------------------------------------------------

| |  |  | Level 2 - Significant observable pricing inputs other than quoted prices included within Level 1 that are either directly or indirectly observable as of the
reporting date. Essentially, inputs that are derived principally from or corroborated by observable market data.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | Level 3 - Generally unobservable inputs, which are developed based on the best information available and may include our own internal data.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------

Determining the appropriate classification of our fair value measurements within the fair value hierarchy requires managements
judgment regarding the degree to which market data is observable or corroborated by observable market data. As interpretations of Statement 157 evolve, our classification of certain instruments within the hierarchy may be revised.

The following table sets forth our recurring fair value measurements for the period indicated.



|            |  |                        |         |   |         |   |         |  |   |             |   |       |   |        |  |   |         |  
|----------- |  | ---------------------- | ------- | - | ------- | - | ------- |  | - | ----------- | - | ----- | - | ------ |  | - | ------- | -
|            |  | June 30, 2008          |        
|            |  | Level 1                |         |   | Level 2 |   | Level 3 |  |   | Netting (a) |   | Total |  
|            |  | (Thousands of dollars) |        
|Derivatives |  |                        |         |   |         |   |         |  |   |             |   |       |   |        |  |   |         |  
|Liabilities |  | $                      | (15,044 | ) |         | $ |        |  | $ | (37,704     | ) |       | $ | 21,100 |  | $ | (31,648 | )

|    |  |   |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|--- |  | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|    |  |  
|(a) |  | - |  | Our derivative liabilities are included in other current liabilities in our Consolidated Balance Sheets and are presented on a net basis. We net derivative assets and liabilities, including cash
collateral in accordance with FIN 39-1, when a legally enforceable master netting agreement exists between us and the counterparty to a derivative contract. At June 30, 2008, the $21.1 million represents our right to reclaim cash collateral.

For derivatives for which fair value is determined based on multiple inputs, Statement 157 requires that the
measurement for an individual derivative be categorized within a single level based on the lowest level input that is significant to the fair value measurement in its entirety.

Our Level 1 fair value measurements are primarily based on NYMEX-settled prices for natural gas and crude oil. For our Level 3 inputs, we utilize modeling techniques using NYMEX-settled pricing data and historical
correlations of NGL product prices to crude oil. All of our derivatives are part of a hedge relationship.



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##### Table of Contents

The following tables set forth a reconciliation of our Level 3 fair value measurements for the periods indicated.



|                                                                                                                                                                                            |  |                                |         |  
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ------------------------------ | ------- | -
|                                                                                                                                                                                            |  | Derivative Assets(Liabilities) |        
|                                                                                                                                                                                            |  | (Thousands of dollars)         |        
|Net liabilities at March 31, 2008                                                                                                                                                           |  | $                              | (10,386 | )
|Total realized/unrealized gains (losses):                                                                                                                                                   |  |                                |         |  
|Included in earnings (a)                                                                                                                                                                    |  |                                | (7      | )
|Included in other comprehensive income (loss)                                                                                                                                               |  |                                | (27,311 | )
|Transfers in and/or out of Level 3                                                                                                                                                          |  |                                | -       |  
|Net liabilities at June 30, 2008                                                                                                                                                            |  | $                              | (37,704 | )
|                                                                                                                                                                                            |  |                                |         |  
|Total gains (losses) for the three-month period included in earnings attributable to the change in
unrealized gain (loss) relating to assets and liabilities still held as of June 30, 2008 |  | $                              | -       |  

|    |  |   |  |                                                               
|--- |  | - |  | --------------------------------------------------------------
|    |  |  
|(a) |  | - |  | Reported in revenues in our Consolidated Statements of Income.



|                                                                                                                                                                                          |  |                                |         |  
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ------------------------------ | ------- | -
|                                                                                                                                                                                          |  | Derivative Assets(Liabilities) |        
|                                                                                                                                                                                          |  | (Thousands of dollars)         |        
|Net liabilities at January 1, 2008                                                                                                                                                        |  | $                              | (16,400 | )
|Total realized/unrealized gains (losses):                                                                                                                                                 |  |                                |         |  
|Included in earnings (a)                                                                                                                                                                  |  |                                | 973     |  
|Included in other comprehensive income (loss)                                                                                                                                             |  |                                | (22,277 | )
|Transfers in and/or out of Level 3                                                                                                                                                        |  |                                | -       |  
|Net liabilities at June 30, 2008                                                                                                                                                          |  | $                              | (37,704 | )
|                                                                                                                                                                                          |  |                                |         |  
|Total gains (losses) for the six-month period included in earnings attributable to the change in
unrealized gain (loss) relating to assets and liabilities still held as of June 30, 2008 |  | $                              | -       |  

|    |  |   |  |                                                               
|--- |  | - |  | --------------------------------------------------------------
|    |  |  
|(a) |  | - |  | Reported in revenues in our Consolidated Statements of Income.



|D. | DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES
|-- | ---------------------------------------------

We utilize financial
instruments to reduce our market risk exposure to interest rate and commodity price fluctuations and to achieve more predictable cash flows. We follow established policies and procedures to assess risk and approve, monitor and report our financial
instrument activities. We do not use these instruments for trading purposes.

Cash Flow Hedges - Our Natural Gas Gathering and Processing segment
primarily utilizes NYMEX-based futures, collars and over-the-counter swaps, which are designated as cash flow hedges, to hedge our exposure to volatility in the price of natural gas, NGLs and condensate. At June 30, 2008, the accompanying
Consolidated Balance Sheet reflected an unrealized loss of $51.9 million in accumulated other comprehensive income (loss), with a corresponding offset in derivative financial instrument assets and liabilities, all of which will be recognized over
the next 18 months. If prices remain at current levels, we will recognize $48.7 million in losses over the next 12 months, and we will recognize losses of $3.2 million thereafter. Net gains and losses related to the ineffective portion of our hedges
are reclassified out of accumulated other comprehensive income (loss) to revenues in the period the ineffectiveness occurs. Ineffectiveness related to our cash flow hedges was not material for the three and six months ended June 30, 2008 and
2007. In the event that forecasted transactions do not occur, we would discontinue cash flow hedge treatment, which would affect earnings. There were no material gains or losses during the three and six months ended June 30, 2008 and 2007, due
to the discontinuance of cash flow hedge treatment.



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Fair Value Hedges - In prior years, we terminated various interest-rate swap agreements. The net savings from the
termination of these swaps is being recognized in interest expense over the terms of the debt instruments originally hedged. Interest expense savings for the six months ended June 30, 2008, from amortization of terminated swaps was $1.9
million, and the remaining amortization of terminated swaps will be recognized over the following periods.



|                  |  |                       |     |  | 
|----------------- |  | --------------------- | --- |  | 
|                  |  |                       |     |  | 
|                  |  | (Millions of dollars) |     | 
|Remainder of 2008 |  | $                     | 1.9 |  | 
|2009              |  |                       | 3.7 |  | 
|2010              |  |                       | 3.7 |  | 
|2011              |  |                       | 0.9 |  | 
|2012              |  |                       | -   |  | 
|Thereafter        |  |                       | -   |  | 

At June 30, 2008, none of the interest on our fixed-rate debt was swapped to floating using interest rate
swaps.



|E. | OTHER COMPREHENSIVE INCOME (LOSS)
|-- | ---------------------------------

The table below shows other comprehensive income (loss) for the periods indicated.



|                                                   |  |                            |         |   |                          |   |        |      |  |   |         |   |  |   |        |   |  | 
|-------------------------------------------------- |  | -------------------------- | ------- | - | ------------------------ | - | ------ | ---- |  | - | ------- | - |  | - | ------ | - |  | 
|                                                   |  | Three Months EndedJune 30, |         |   | Six Months EndedJune 30, |   |        |     
|                                                   |  | 2008                       |         |   | 2007                     |   |        | 2008 |  |   | 2007    |   |  |  
|                                                   |  | (Thousands of dollars)     |         |   |                         
|Unrealized losses on derivative assets/liabilities |  | $                          | (47,620 | ) |                          | $ | (2,860 | )    |  | $ | (53,165 | ) |  | $ | (6,728 | ) |  | 
|Less: Realized losses recognized in net income     |  |                            | (9,571  | ) |                          |   | -      |      |  |   | (16,865 | ) |  |   | -      |   |  | 
|Other comprehensive loss                           |  | $                          | (38,049 | ) |                          | $ | (2,860 | )    |  | $ | (36,300 | ) |  | $ | (6,728 | ) |  | 
|                                                  

The table below shows the balance in accumulated other comprehensive income (loss) for the period indicated.



|                         |  |                                                  |         |   |  | 
|------------------------ |  | ------------------------------------------------ | ------- | - |  | 
|                         |  | Unrealized Losses onDerivativeAssets/Liabilities |         |   | 
|                         |  | (Thousands of dollars)                           |         |   | 
|December 31, 2007        |  | $                                                | (18,141 | ) |  | 
|Other comprehensive loss |  |                                                  | (36,300 | ) |  | 
|June 30, 2008            |  | $                                                | (54,441 | ) |  | 
|                        



|F. | PARTNERS EQUITY
|-- | ----------------

ONEOK and its affiliates own all of the
Class B units, 5,900,000 common units and the entire 2 percent general partner interest in us, which together constituted a 47.7 percent interest in us at June 30, 2008.

In March 2008, we completed a public offering of 2.5 million common units at $58.10 per common unit, generating net proceeds of approximately $140.4 million after deducting underwriting discounts but before
offering expenses. In addition, we sold 5.4 million common units to ONEOK in a private placement, generating proceeds of approximately $303.2 million. In conjunction with the public offering of common units and the private placement, ONEOK
Partners GP contributed $9.4 million in order to maintain its 2 percent general partner interest in us.

In April 2008, we sold an additional 128,873
common units at $58.10 per common unit to the underwriters of the public offering upon the partial exercise of their option to purchase additional common units to cover over-allotments. We received net proceeds of approximately $7.2 million from the
sale of the common units after deducting underwriting discounts but before offering expenses. In conjunction with the partial exercise by the underwriters, ONEOK Partners GP contributed $0.2 million in order to maintain its 2 percent general partner
interest in us.

We used a portion of the proceeds from the sale of common units and the general partner contributions to repay borrowings under our
revolving credit agreement (2007 Partnership Credit Agreement).



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##### Table of Contents

The following summarizes our quarterly cash distribution activity for 2008.

| |  |  | In January 2008, we declared a cash distribution of $1.025 per unit for the fourth quarter of 2007. The distribution was paid on February 14, 2008, to
unitholders of record on January 31, 2008.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | In April 2008, we declared a cash distribution of $1.04 per unit for the first quarter of 2008. The distribution was paid on May 15, 2008, to unitholders of
record as of April 30, 2008.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | In July 2008, we declared a cash distribution of $1.06 per unit ($4.24 per unit on an annualized basis) for the second quarter of 2008. The distribution will be
paid on August 14, 2008, to unitholders of record as of July 31, 2008.
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

As an incentive, our general partners percentage
interest in quarterly distributions increases after certain specified target levels are met. For additional information, see Cash Distribution Policy under Part II, Item 5, Market for Registrants Common Equity, Related
Stockholder Matters and Issuer Purchases of Equity Securities, in our Annual Report on Form 10-K for the year ended December 31, 2007.



|G. | CREDIT FACILITIES
|-- | -----------------

Our 2007 Partnership Credit Agreement contains
typical covenants as discussed in Note F of the Notes to Consolidated Financial Statements in our Annual Report on Form 10-K for the year ended December 31, 2007. At June 30, 2008, we were in compliance with all covenants.

At June 30, 2008, we had $120 million in borrowings outstanding and $880 million of credit available under the 2007 Partnership Credit Agreement.

We have a $15 million Senior Unsecured Letter of Credit Facility and Reimbursement Agreement with Wells Fargo Bank, N.A., of which $12 million is currently being used,
and an agreement with Royal Bank of Canada, pursuant to which a $12 million letter of credit was issued. Both agreements are used to support various permits required by the KDHE for our ongoing business in Kansas.



|H. | COMMITMENTS AND CONTINGENCIES
|-- | -----------------------------

As a result of an internal review of
a transaction that was brought to the attention of one of our affiliates by a third party, we conducted an internal review of transactions that may have violated FERC natural gas capacity release rules or related rules and determined that there were
transactions that should have been disclosed to the FERC. We notified the FERC of this review and filed a report with the FERC regarding these transactions in March 2008. We are cooperating fully with the FERC and have taken action to ensure that
current and future transactions comply with applicable FERC regulations. We are unable to predict the outcome of any FERC action in this matter. At this time, we do not believe that penalties associated with potential violations will have a material
impact on our results of operations, financial position or liquidity.



|I. | SEGMENTS
|-- | --------

Segment Descriptions - In July 2007, we announced
a series of organizational changes that led to the realignment of our previous business segments. See Note A for a discussion of these changes. Our operations are divided into strategic business segments based on similarities in economic
characteristics, products and services, types of customers, methods of distribution and regulatory environment, as follows:



| |  |  | our Natural Gas Gathering and Processing segment primarily gathers and processes unprocessed natural gas;
| | - |  | ---------------------------------------------------------------------------------------------------------



| |  |  | our Natural Gas Pipelines segment primarily operates regulated interstate and intrastate natural gas transmission pipelines and natural gas storage facilities;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our Natural Gas Liquids Gathering and Fractionation segment primarily gathers, treats and fractionates NGLs and stores and markets NGL products; and
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our Natural Gas Liquids Pipelines segment primarily operates FERC-regulated interstate natural gas liquids gathering and distribution pipelines.
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------

Accounting Policies - The accounting policies of the segments are the same as those described in Note A and Note J of the Notes
to Consolidated Financial Statements in our Annual Report on Form 10-K for the year ended December 31, 2007. Intersegment and affiliate sales are recorded on the same basis as sales to unaffiliated customers. Our Natural Gas Gathering and
Processing segment sells natural gas to ONEOK and its subsidiaries. A portion of our Natural Gas Pipelines segments revenues are from subsidiaries of ONEOK that utilize transportation and storage services. Corporate overhead costs relating to
a reportable segment have been allocated for the purpose of calculating operating income. Our equity method investments do not represent operating segments.



15



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##### Table of Contents

Customers - In 2008, we had one customer, Dow Hydrocarbons and Resources L.L.C., from which we received $308
million and $476 million, or approximately 14 percent and 11 percent of our consolidated revenues, for the three and six months ended June 30, 2008, respectively. All of these revenues were received by our Natural Gas Liquids Gathering and
Fractionation segment. In 2007, we had no single external customer from which we received 10 percent or more of our consolidated revenues.

Operating
Segment Information - The following tables set forth certain selected financial information for our operating segments for the periods indicated. Amounts in prior periods have been restated to conform to our current presentation.



|                                 |  |                                    |         |   |                          |   |        |                                              |  |                                 |           |                       |   |         |       |   |          |   |  |   |           |   |  | 
|-------------------------------- |  | ---------------------------------- | ------- | - | ------------------------ | - | ------ | -------------------------------------------- |  | ------------------------------- | --------- | --------------------- | - | ------- | ----- | - | -------- | - |  | - | --------- | - |  | 
|Three Months Ended June 30, 2008 |  | Natural GasGathering andProcessing |         |   | Natural GasPipelines (a) |   |        | Natural GasLiquidsGathering andFractionation |  | Natural GasLiquidsPipelines (b) |           | Other andEliminations |   |         | Total |   |          |  
|                                 |  | (Thousands of dollars)             |         |   |                         
|Sales to unaffiliated customers  |  | $                                  | 140,209 |   |                          | $ | 56,050 |                                              |  | $                               | 1,730,488 |                       | $ | 12,824  |       | $ | (1       | ) |  | $ | 1,939,570 |   |  | 
|Sales to affiliated customers    |  |                                    | 171,080 |   |                          |   | 33,242 |                                              |  |                                 |          |                       |   |        |       |   |         |   |  |   | 204,322   |   |  | 
|Intersegment sales               |  |                                    | 227,444 |   |                          |   | 504    |                                              |  |                                 | 8,616     |                       |   | 21,952  |       |   | (258,516 | ) |  |   |          |   |  | 
|Total revenues                   |  | $                                  | 538,733 |   |                          | $ | 89,796 |                                              |  | $                               | 1,739,104 |                       | $ | 34,776  |       | $ | (258,517 | ) |  | $ | 2,143,892 |   |  | 
|Gain (loss) on sale of assets    |  | $                                  | (6      | ) |                          | $ | (35    | )                                            |  | $                               | 6         |                       | $ |        |       | $ | 32       |   |  | $ | (3        | ) |  | 
|Operating income                 |  | $                                  | 76,183  |   |                          | $ | 37,691 |                                              |  | $                               | 41,687    |                       | $ | 9,890   |       | $ | (1,712   | ) |  | $ | 163,739   |   |  | 
|Equity earnings from investments |  | $                                  | 8,126   |   |                          | $ | 9,153  |                                              |  | $                               |          |                       | $ | 331     |       | $ |         |   |  | $ | 17,610    |   |  | 
|Capital expenditures             |  | $                                  | 36,348  |   |                          | $ | 29,766 |                                              |  | $                               | 55,048    |                       | $ | 136,354 |       | $ | 13       |   |  | $ | 257,529   |   |  | 

|    |  |   |  |                                                                                                                                                                                                                                                     
|--- |  | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|    |  |  
|(a) |  | - |  | Our Natural Gas Pipelines segment has regulated and non-regulated operations. Our Natural Gas Pipelines segments regulated operations had revenues of $73.4 million and operating income of
$27.2 million for the three months ended June 30, 2008.
|(b) |  | - |  | All of our Natural Gas Liquids Pipelines segments operations are regulated.                                                                                                                                                                        



|                                 |  |                                    |         |   |                          |   |                                              |  |                                 |           |                       |   |        |       |   |          |   |  |   |           |  
|-------------------------------- |  | ---------------------------------- | ------- | - | ------------------------ | - | -------------------------------------------- |  | ------------------------------- | --------- | --------------------- | - | ------ | ----- | - | -------- | - |  | - | --------- | -
|Three Months Ended June 30, 2007 |  | Natural GasGathering andProcessing |         |   | Natural GasPipelines (a) |   | Natural GasLiquidsGathering andFractionation |  | Natural GasLiquidsPipelines (b) |           | Other andEliminations |   |        | Total |  
|                                 |  | (Thousands of dollars)             |        
|Sales to unaffiliated customers  |  | $                                  | 107,633 |   |                          | $ | 45,066                                       |  | $                               | 1,057,817 |                       | $ |       |       | $ | 4        |   |  | $ | 1,210,520 |  
|Sales to affiliated customers    |  |                                    | 140,692 |   |                          |   | 24,102                                       |  |                                 |          |                       |   |       |       |   |         |   |  |   | 164,794   |  
|Intersegment sales               |  |                                    | 114,432 |   |                          |   | 180                                          |  |                                 | 9,818     |                       |   | 18,863 |       |   | (143,293 | ) |  |   |          |  
|Total revenues                   |  | $                                  | 362,757 |   |                          | $ | 69,348                                       |  | $                               | 1,067,635 |                       | $ | 18,863 |       | $ | (143,289 | ) |  | $ | 1,375,314 |  
|Gain (loss) on sale of assets    |  | $                                  | (384    | ) |                          | $ | 3                                            |  | $                               | 2         |                       | $ |       |       | $ |         |   |  | $ | (379      | )
|Operating income                 |  | $                                  | 46,274  |   |                          | $ | 25,077                                       |  | $                               | 31,787    |                       | $ | 8,412  |       | $ | (3,992   | ) |  | $ | 107,558   |  
|Equity earnings from investments |  | $                                  | 7,730   |   |                          | $ | 10,614                                       |  | $                               |          |                       | $ | 414    |       | $ |         |   |  | $ | 18,758    |  
|Capital expenditures             |  | $                                  | 23,612  |   |                          | $ | 28,424                                       |  | $                               | 15,114    |                       | $ | 64,677 |       | $ |         |   |  | $ | 131,827   |  



|    |  |   |  |                                                                                                                                                                                                                                                     
|--- |  | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|(a) |  | - |  | Our Natural Gas Pipelines segment has regulated and non-regulated operations. Our Natural Gas Pipelines segments regulated operations had revenues of $55.8 million and operating income of
$17.1 million for the three months ended June 30, 2007.
|(b) |  | - |  | All of our Natural Gas Liquids Pipelines segments operations are regulated.                                                                                                                                                                        



|                                        |  |                                    |           |   |                          |   |           |                                              |  |                                 |           |                       |   |           |       |   |          |   |  |   |          
|--------------------------------------- |  | ---------------------------------- | --------- | - | ------------------------ | - | --------- | -------------------------------------------- |  | ------------------------------- | --------- | --------------------- | - | --------- | ----- | - | -------- | - |  | - | ---------
|Six Months Ended June 30, 2008          |  | Natural GasGathering andProcessing |           |   | Natural GasPipelines (a) |   |           | Natural GasLiquidsGathering andFractionation |  | Natural GasLiquidsPipelines (b) |           | Other andEliminations |   |           | Total
|                                        |  | (Thousands of dollars)            
|Sales to unaffiliated customers         |  | $                                  | 236,790   |   |                          | $ | 117,915   |                                              |  | $                               | 3,430,558 |                       | $ | 30,007    |       | $ |         |   |  | $ | 3,815,270
|Sales to affiliated customers           |  |                                    | 326,374   |   |                          |   | 61,283    |                                              |  |                                 |          |                       |   |          |       |   |         |   |  |   | 387,657  
|Intersegment sales                      |  |                                    | 412,139   |   |                          |   | 770       |                                              |  |                                 | 15,066    |                       |   | 43,452    |       |   | (471,427 | ) |  |   |         
|Total revenues                          |  | $                                  | 975,303   |   |                          | $ | 179,968   |                                              |  | $                               | 3,445,624 |                       | $ | 73,459    |       | $ | (471,427 | ) |  | $ | 4,202,927
|Gain (loss) on sale of assets           |  | $                                  | (5        | ) |                          | $ | (18       | )                                            |  | $                               | 18        |                       | $ | 1         |       | $ | 32       |   |  | $ | 28       
|Operating income                        |  | $                                  | 135,236   |   |                          | $ | 69,405    |                                              |  | $                               | 86,974    |                       | $ | 23,703    |       | $ | (1,047   | ) |  | $ | 314,271  
|Equity earnings from investments        |  | $                                  | 15,170    |   |                          | $ | 29,214    |                                              |  | $                               |          |                       | $ | 1,009     |       | $ |         |   |  | $ | 45,393   
|Investment in unconsolidated affiliates |  | $                                  | 317,061   |   |                          | $ | 405,939   |                                              |  | $                               |          |                       | $ | 29,952    |       | $ |         |   |  | $ | 752,952  
|Total assets                            |  | $                                  | 1,687,470 |   |                          | $ | 1,150,875 |                                              |  | $                               | 2,101,804 |                       | $ | 1,447,291 |       | $ | 482,100  |   |  | $ | 6,869,540
|Capital expenditures                    |  | $                                  | 62,835    |   |                          | $ | 51,988    |                                              |  | $                               | 84,619    |                       | $ | 325,080   |       | $ | 65       |   |  | $ | 524,587  

|    |  |   |  |                                                                                                                                                                                                                                                    
|--- |  | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|    |  |  
|(a) |  | - |  | Our Natural Gas Pipelines segment has regulated and non-regulated operations. Our Natural Gas Pipelines segments regulated operations had revenues of $150.5 million and operating income of
$51.0 million for the six months ended June 30, 2008.
|(b) |  | - |  | All of our Natural Gas Liquids Pipelines segments operations are regulated.                                                                                                                                                                       



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|                                        |  |                                    |           |                          |   |                                              |  |                                 |           |                       |   |         |       |   |          |   |  |   |          
|--------------------------------------- |  | ---------------------------------- | --------- | ------------------------ | - | -------------------------------------------- |  | ------------------------------- | --------- | --------------------- | - | ------- | ----- | - | -------- | - |  | - | ---------
|Six Months Ended June 30, 2007          |  | Natural GasGathering andProcessing |           | Natural GasPipelines (a) |   | Natural GasLiquidsGathering andFractionation |  | Natural GasLiquidsPipelines (b) |           | Other andEliminations |   |         | Total
|                                        |  | (Thousands of dollars)            
|Sales to unaffiliated customers         |  | $                                  | 211,208   |                          | $ | 95,843                                       |  | $                               | 1,915,780 |                       | $ |        |       | $ | 27       |   |  | $ | 2,222,858
|Sales to affiliated customers           |  |                                    | 271,119   |                          |   | 50,011                                       |  |                                 |          |                       |   |        |       |   |         |   |  |   | 321,130  
|Intersegment sales                      |  |                                    | 203,311   |                          |   | 507                                          |  |                                 | 12,787    |                       |   | 36,522  |       |   | (253,127 | ) |  |   |         
|Total revenues                          |  | $                                  | 685,638   |                          | $ | 146,361                                      |  | $                               | 1,928,567 |                       | $ | 36,522  |       | $ | (253,100 | ) |  | $ | 2,543,988
|Gain (loss) on sale of assets           |  | $                                  | 1,813     |                          | $ | 6                                            |  | $                               | 4         |                       | $ | 1       |       | $ |         |   |  | $ | 1,824    
|Operating income                        |  | $                                  | 76,726    |                          | $ | 57,438                                       |  | $                               | 63,786    |                       | $ | 17,047  |       | $ | (3,063   | ) |  | $ | 211,934  
|Equity earnings from investments        |  | $                                  | 13,338    |                          | $ | 28,782                                       |  | $                               |          |                       | $ | 693     |       | $ |         |   |  | $ | 42,813   
|Investment in unconsolidated affiliates |  | $                                  | 298,768   |                          | $ | 433,320                                      |  | $                               |          |                       | $ | 9,763   |       | $ |         |   |  | $ | 741,851  
|Total assets                            |  | $                                  | 1,704,940 |                          | $ | 1,278,026                                    |  | $                               | 1,658,672 |                       | $ | 616,553 |       | $ | (123,746 | ) |  | $ | 5,134,445
|Capital expenditures                    |  | $                                  | 39,928    |                          | $ | 46,074                                       |  | $                               | 22,589    |                       | $ | 97,794  |       | $ | 6        |   |  | $ | 206,391  



|    |  |   |  |                                                                                                                                                                                                                                                    
|--- |  | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|(a) |  | - |  | Our Natural Gas Pipelines segment has regulated and non-regulated operations. Our Natural Gas Pipelines segments regulated operations had revenues of $121.5 million and operating income of
$42.5 million for the six months ended June 30, 2007.
|(b) |  | - |  | All of our Natural Gas Liquids Pipelines segments operations are regulated.                                                                                                                                                                       



|J. | UNCONSOLIDATED AFFILIATES
|-- | -------------------------

Equity Earnings from Investments
- The following table sets forth our equity earnings from investments for the periods indicated.



|                                     |  |                            |        |                          |   |        |  |      |        |  |   |        |  | 
|------------------------------------ |  | -------------------------- | ------ | ------------------------ | - | ------ |  | ---- | ------ |  | - | ------ |  | 
|                                     |  | Three Months EndedJune 30, |        | Six Months EndedJune 30, |   |       
|                                     |  | 2008                       |        | 2007                     |   | 2008   |  | 2007 |        | 
|                                     |  | (Thousands of dollars)     |        |                         
|Northern Border Pipeline             |  | $                          | 8,880  |                          | $ | 10,511 |  | $    | 28,661 |  | $ | 28,551 |  | 
|Bighorn Gas Gathering, L.L.C.        |  |                            | 2,005  |                          |   | 2,009  |  |      | 4,323  |  |   | 3,700  |  | 
|Fort Union Gas Gathering             |  |                            | 3,464  |                          |   | 2,567  |  |      | 5,759  |  |   | 5,155  |  | 
|Lost Creek Gathering Company, L.L.C. |  |                            | 1,797  |                          |   | 304    |  |      | 3,082  |  |   | 1,633  |  | 
|Other                                |  |                            | 1,464  |                          |   | 3,367  |  |      | 3,568  |  |   | 3,774  |  | 
|Equity earnings from investments     |  | $                          | 17,610 |                          | $ | 18,758 |  | $    | 45,393 |  | $ | 42,813 |  | 
|                                    

Unconsolidated Affiliates Financial Information - Summarized combined financial information of our
unconsolidated affiliates is presented below.



|                         |  |                            |        |                          |   |        |  |      |         |  |   |         |  | 
|------------------------ |  | -------------------------- | ------ | ------------------------ | - | ------ |  | ---- | ------- |  | - | ------- |  | 
|                         |  | Three Months EndedJune 30, |        | Six Months EndedJune 30, |   |       
|(Unaudited)              |  | 2008                       |        | 2007                     |   | 2008   |  | 2007 |         | 
|                         |  | (Thousands of dollars)     |        |                         
|Income Statement         |  |                            |        |                          |   |        |  |      |         |  |   |         |  | 
|Revenues                 |  | $                          | 95,040 |                          | $ | 88,619 |  | $    | 206,435 |  | $ | 188,887 |  | 
|Operating expenses       |  |                            | 45,201 |                          |   | 43,561 |  |      | 88,545  |  |   | 82,705  |  | 
|Net income               |  |                            | 33,927 |                          |   | 33,747 |  |      | 89,748  |  |   | 83,483  |  | 
|Distributions paid to us |  | $                          | 33,214 |                          | $ | 30,611 |  | $    | 60,627  |  | $ | 57,066  |  | 



|K. | NET INCOME PER UNIT
|-- | -------------------

Net income per unit is computed by dividing
net income, after deducting the general partners allocation, by the weighted average number of outstanding limited partner units. The general partner owns the entire 2 percent interest in us and also owns incentive distribution rights that
provide for an increasing proportion of cash distributions from the partnership as the distributions made to limited partners increase above specified levels. For purposes of our calculation of net income per unit, net income is generally allocated
to the general partner as follows: (i) an amount based upon the 2 percent general partner interest in net income and (ii) the amount of the general partners incentive distribution rights based on the total cash distributions declared
for the period. The amount of incentive distribution allocated to our general partner totaled $18.6 million and $35.4 million for the three and six months ended June 30, 2008, respectively. Distributions paid to our general partner and shown on
our Consolidated Statement of Changes in Partners Equity and Comprehensive Income of $35.3 million included $30.9 million in incentive distributions paid to our general partner during the first six months of 2008.



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Gains resulting from interim capital transactions, as defined in our Partnership Agreement, are generally not subject to
distribution; however, our Partnership Agreement provides that if such distributions were made, the incentive distribution rights would not apply. Accordingly, the gain (loss) on sale of assets for the three and six months ended June 30, 2008
and 2007 had no impact on the incentive distribution rights.



|L. | RELATED-PARTY TRANSACTIONS
|-- | --------------------------

Intersegment and affiliate sales are
recorded on the same basis as sales to unaffiliated customers. Our Natural Gas Gathering and Processing segment sells natural gas to ONEOK and its subsidiaries. A portion of our Natural Gas Pipelines segments revenues are from ONEOK and its
subsidiaries that utilize natural gas transportation and storage services.

We have certain contractual rights to the Bushton Plant that is leased by OBPI.
Our Processing and Services Agreement with ONEOK and OBPI sets out the terms by which OBPI provides services at the Bushton Plant through 2012. We have contracted for all of the capacity of the Bushton Plant from OBPI. In exchange, we pay OBPI for
all direct costs and expenses of the Bushton Plant, including reimbursement of a portion of OBPIs obligations under equipment leases covering the Bushton Plant.

Under the Services Agreement with ONEOK, ONEOK Partners GP and NBP Services, our operations and the operations of ONEOK and its affiliates can combine or share certain common services in order to operate more
efficiently and cost effectively. Under the Services Agreement, ONEOK provides to us at least the type and amount of services that it provides to its affiliates, including those services required to be provided pursuant to our Partnership Agreement.
ONEOK Partners GP continues to operate our interstate natural gas pipeline assets according to each pipelines operating agreement. ONEOK Partners GP may purchase services from ONEOK and its affiliates pursuant to the terms of the Services
Agreement. ONEOK Partners GP has no employees and utilizes the services of ONEOK and ONEOK Services Company to fulfill its responsibilities.

ONEOK and its
affiliates provide a variety of services to us under the Services Agreement, including cash management and financial services, employee benefits provided through ONEOKs benefit plans, administrative services, insurance and office space leased
in ONEOKs headquarters building and other field locations. Where costs are specifically incurred on behalf of one of our affiliates, the costs are billed directly to us by ONEOK. In other situations, the costs may be allocated to us through a
variety of methods, depending upon the nature of the expense and activities. For example, a service that applies equally to all employees is allocated based upon the number of employees. However, an expense benefiting the consolidated company but
having no direct basis for allocation is allocated by the modified Distrigas method, a method using a combination of ratios that include gross plant and investment, earnings before interest and taxes and payroll expense. All costs directly charged
or allocated to us are included in our Consolidated Statements of Income.

An affiliate of ONEOK enters into some of the commodity derivative contracts at
the direction of and on behalf of our Natural Gas Gathering and Processing segment. See Note D for a discussion of our derivative instruments and hedging activities.

The following table sets forth the transactions with related parties for the periods indicated.



|                                    |  |                            |         |                          |   |         |  |      |         |  |   |         |  | 
|----------------------------------- |  | -------------------------- | ------- | ------------------------ | - | ------- |  | ---- | ------- |  | - | ------- |  | 
|                                    |  | Three Months EndedJune 30, |         | Six Months EndedJune 30, |   |        
|                                    |  | 2008                       |         | 2007                     |   | 2008    |  | 2007 |         | 
|                                    |  | (Thousands of dollars)     |         |                         
|Revenues                            |  | $                          | 204,322 |                          | $ | 164,794 |  | $    | 387,657 |  | $ | 321,130 |  | 
|Administrative and general expenses |  | $                          | 43,333  |                          | $ | 41,081  |  | $    | 90,234  |  | $ | 85,210  |  | 

In addition, concurrent with our sale of common units to the public, we sold 5.4 million common units to
ONEOK in March 2008 in a private placement, generating proceeds of approximately $303.2 million. ONEOK Partners GP also made additional general partner contributions to us in March and April 2008. See Note F for additional information.



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|ITEM 2. | MANAGEMENTS DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
|------- | -------------------------------------------------------------------------------------

The following discussion and analysis should be read in conjunction with our unaudited consolidated financial statements and the Notes to Consolidated Financial Statements in this Quarterly Report on Form 10-Q, as
well as our Annual Report on Form 10-K for the year ended December 31, 2007.

EXECUTIVE SUMMARY

The following discussion highlights some of our achievements and significant issues affecting us for the periods presented. Please refer to the Financial and
Operating Results and Liquidity and Capital Resources sections of Managements Discussion and Analysis of Financial Condition and Results of Operations and our Consolidated Financial Statements for additional information.

In July 2007, we announced a series of organizational changes that led to the realignment of our previous business segments. Our financial results are now
reported in these four segments: (i) Natural Gas Gathering and Processing, which remains unchanged; (ii) Natural Gas Pipelines, which is comprised of our former interstate natural gas pipelines segment and the natural gas assets of our
former pipelines and storage segment; (iii) Natural Gas Liquids Gathering and Fractionation, which remains unchanged; and (iv) Natural Gas Liquids Pipelines, which is comprised of the natural gas liquids assets of our former pipelines and
storage segment. Prior periods have been restated to reflect these segment changes.

In March 2008, we completed a public offering of 2.5 million
common units at $58.10 per common unit, generating net proceeds of approximately $140.4 million after deducting underwriting discounts but before offering expenses. In addition, we sold 5.4 million common units to ONEOK in a private placement,
generating proceeds of approximately $303.2 million. In conjunction with the public offering of common units and the private placement, ONEOK Partners GP contributed $9.4 million in order to maintain its 2 percent general partner interest in us.

In April 2008, we sold an additional 128,873 common units at $58.10 per common unit to the underwriters of the public offering upon the partial exercise
of their option to purchase additional common units to cover over-allotments. We received net proceeds of approximately $7.2 million from the sale of the common units after deducting underwriting discounts but before offering expenses. In
conjunction with the partial exercise by the underwriters, ONEOK Partners GP contributed $0.2 million in order to maintain its 2 percent general partner interest in us. As a result of these transactions, ONEOK now holds an aggregate 47.7 percent
interest in us.

We used a portion of the proceeds from the sale of common units and the general partner contributions to repay borrowings under our
revolving credit agreement (2007 Partnership Credit Agreement).

In July 2008, we declared an increase in our cash distribution to $1.06 per unit ($4.24
per unit on an annualized basis), an increase of 6 percent over the $1.00 per unit declared in July 2007.

Net income per unit increased to $1.46 for the
three months ended June 30, 2008, compared with $0.97 for the same period in 2007. For the six-month period, net income per unit increased to $2.94 from $1.97 for the same period last year. The increase in net income per unit for the three- and
six-month periods is primarily due to the following:

| |  |  | higher realized commodity prices in our Natural Gas Gathering and Processing segment,
| | - |  | -------------------------------------------------------------------------------------

| |  |  | new supply connections and increased fractionation volumes in our Natural Gas Liquids Gathering and Fractionation segment,
| | - |  | --------------------------------------------------------------------------------------------------------------------------

| |  |  | wider regional product price differentials in our Natural Gas Liquids Gathering and Fractionation segment, and
| | - |  | --------------------------------------------------------------------------------------------------------------

| |  |  | incremental net income in our Natural Gas Liquids Pipelines segment from the assets acquired from Kinder Morgan Energy Partners, L.P. (Kinder Morgan) in October
2007.
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------

In July 2008, the final phase of the Fort Union Gas Gathering expansion project was placed into service. See Capital
Projects below for additional information. In January 2008, Midwestern Gas Transmission, our subsidiary, placed its eastern extension pipeline into service.

SIGNIFICANT ACQUISITION

In October 2007, we completed the acquisition of an interstate natural gas liquids and refined petroleum products
pipeline system and related assets from a subsidiary of Kinder Morgan for approximately $300 million, before working capital adjustments. The system extends from Bushton and Conway, Kansas, to Chicago, Illinois, and transports, stores and delivers



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a full range of NGL and refined petroleum products. The FERC-regulated system spans 1,624 miles and has a capacity to transport up to 134 MBbl/d. The
transaction included approximately 978 MBbl of owned storage capacity, eight NGL terminals and a 50 percent ownership of Heartland. ConocoPhillips owns the other 50 percent of Heartland and is the managing partner of the Heartland joint venture,
which consists primarily of three refined petroleum products terminals and connecting pipelines. Our investment in Heartland is accounted for under the equity method of accounting. Financing for this transaction came from a portion of the proceeds
of our September 2007 issuance of $600 million 6.85 percent Senior Notes due 2037. The working capital settlement was finalized in April 2008, with no material adjustments. These assets are included in our Natural Gas Liquids Pipelines segment.

CAPITAL PROJECTS

Bison Pipeline - In April
2008, Northern Border Pipeline announced that its wholly owned subsidiary, Bison Pipeline LLC, was conducting a binding open season for potential shippers to request firm pipeline capacity on a proposed pipeline system known as the Bison Pipeline.
The Bison Pipeline would extend from natural gas gathering facilities at Deadhorse, Wyoming, a coalbed methane hub located in the Powder River Basin supply area, to a point of interconnection with Northern Border Pipeline in Morton County, North
Dakota. The Bison Pipeline is anticipated to be approximately 289 miles, with initial capacity of approximately 400 MMcf/d and a maximum capacity of approximately 660 MMcf/d. The ultimate capacity of the Bison Pipeline will be determined by the
level of binding shipper commitments. The projected in-service date for the Bison Pipeline is currently November 2010. An affiliate of TransCanada Corporation operates Northern Border Pipeline and will operate the Bison Pipeline. Bison Pipeline
LLC continues to accept bids from potential shippers requesting firm pipeline capacity on the proposed project. The economic viability of the Bison Pipeline will be determined by final shipper commitments, updated construction cost estimates and
risks from competing projects. We own 50 percent of Northern Border Pipeline, which is included in our Natural Gas Pipelines segment and is accounted for under the equity method of accounting.

Woodford Shale Natural Gas Liquids Pipeline Extension - In February 2008, we announced plans to construct a 78-mile natural gas liquids gathering pipeline to
connect two natural gas processing plants, operated by Devon Energy Corporation and Antero Resources Corporation, respectively, in the Woodford Shale area in southeast Oklahoma. The project is currently estimated to cost in the range of $30 million
to $35 million, excluding AFUDC. The project is currently scheduled for completion in the third quarter of 2008. Upon completion, these two plants are expected to have the capacity to produce approximately 25 MBbl/d of unfractionated
NGLs. The natural gas liquids production will be gathered by our existing Mid-Continent natural gas liquids gathering pipelines. Upon completion of the Arbuckle Pipeline project, the Woodford Shale natural gas liquids production is expected to
be transported through the Arbuckle Pipeline to our Mont Belvieu, Texas, fractionation facility. This project is in our Natural Gas Liquids Gathering and Fractionation segment.

Overland Pass Pipeline Company - In May 2006, we entered into an agreement with a subsidiary of The Williams Companies, Inc. (Williams) to form a joint venture
called Overland Pass Pipeline Company. Overland Pass Pipeline Company is building a 760-mile natural gas liquids pipeline from Opal, Wyoming, to the Mid-Continent natural gas liquids market center in Conway, Kansas. The Overland Pass Pipeline is
designed to transport approximately 110 MBbl/d of unfractionated NGLs and can be increased to approximately 255 MBbl/d with additional pump facilities. During 2006, we paid $11.6 million to Williams for the acquisition of our interest in the joint
venture and for reimbursement of initial capital expenditures. As the 99 percent owner of the joint venture, we are managing the construction project, advancing all costs associated with construction and operating the pipeline. Within two years of
the pipeline becoming operational, Williams will have the option to increase its ownership up to 50 percent by reimbursing us for certain costs in accordance with the joint ventures operating agreement. If Williams exercises its option to
increase its ownership to the full 50 percent, Williams would have the option to become operator. This project has received the required approvals of various state and federal regulatory authorities, and we are constructing the pipeline with partial
start-up currently expected during the third quarter of 2008 and the remaining start-up scheduled for the fourth quarter of 2008.

As part of a long-term
agreement, Williams dedicated its NGL production of approximately 60 MBbl/d from two of its natural gas processing plants in Wyoming to the Overland Pass Pipeline. We will provide downstream fractionation, storage and transportation services to
Williams. We have also reached agreements with certain producers for supply commitments of up to an additional 80 MBbl/d and we are negotiating agreements with other producers for supply commitments that could add an additional 60 MBbl/d of supply
to this pipeline within the next three to five years. The pipeline project is currently estimated to cost in the range of $575 million to $590 million, excluding AFUDC. Since our initial estimate in early 2006, there has been a significant increase
in the demand for pipeline construction-related services, which has led to higher construction labor and equipment rates. Additionally, winter construction, due to the extended permitting process, contributed to added construction costs and further
delays. Federal restrictions on construction in wildlife sensitive areas have and continue to impact our estimated costs and construction schedule.



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We are also investing in the range of $230 million to $240 million, excluding AFUDC, to expand our existing fractionation
and storage capabilities and the capacity of our natural gas liquids distribution pipelines. These expansion projects have also experienced cost increases related to design enhancements adding 30 MBbl/d of fractionation capacity, increased
construction labor rates, increased material costs and increased costs resulting from heavy spring rainfall. Part of this expansion will increase the fractionation capacity from 80 MBbl/d to 150 MBbl/d. Startup of Phase I of the fractionators is
complete, and Phase II is expected to begin operation in the third quarter of 2008. Additionally, portions of our natural gas liquids distribution pipeline upgrades were completed in the second quarter of 2008. Overland Pass Pipeline Company is
included in our Natural Gas Liquids Pipelines segment, while the associated expansions are included in our Natural Gas Liquids Gathering and Fractionation segment and Natural Gas Liquids Pipelines segment.

Piceance Lateral Pipeline - In March 2007, we announced that Overland Pass Pipeline Company also plans to construct a 150-mile lateral pipeline with capacity to
transport as much as 100 MBbl/d of unfractionated NGLs from the Piceance Basin in Colorado to the Overland Pass Pipeline. Williams announced that it intends to construct a new natural gas processing plant in the Piceance Basin and will dedicate its
NGL production from that plant and an existing plant to be transported by the lateral pipeline, totaling approximately 30 MBbl/d. We continue to negotiate with other producers for supply commitments. This project requires the approval of various
state and federal regulatory authorities. Construction is currently expected to begin in late 2008 and be completed during the second quarter of 2009. The project is currently estimated to cost in the range of $110 million to $140 million, excluding
AFUDC. This project is in our Natural Gas Liquids Pipelines segment.

Arbuckle Natural Gas Liquids Pipeline - In March 2007, we announced plans to
build the 440-mile Arbuckle Pipeline, a natural gas liquids pipeline from southern Oklahoma through northern Texas and continuing on to the Texas Gulf Coast. Current estimated costs are in the range of $340 million to $360 million, excluding AFUDC.
Negotiations with pipeline contractors have recently been completed and the resulting construction labor rates have increased our project costs. We have also experienced higher than originally expected acquisition costs for pipeline easements,
particularly in the Barnett Shale area, along with increased costs for materials. The Arbuckle Pipeline will have the capacity to transport 160 MBbl/d of unfractionated natural gas liquids, expandable to 210 MBbl/d with additional pump facilities,
and will connect our existing Mid-Continent infrastructure with our fractionation facility in Mont Belvieu, Texas, and other Gulf Coast region fractionators. We have supply commitments from producers for 65 MBbl/d and indications of interest with
other producers that could add an additional 145 MBbl/d of supply within the next three to five years. These additional supply commitments are in various stages of negotiation. Construction of the pipeline will require permits from various federal,
state and local regulatory bodies. Construction is currently expected to begin during the third quarter of 2008 and be completed by early 2009. This project is in our Natural Gas Liquids Pipelines segment.

Williston Basin Gas Processing Plant Expansion - In March 2007, we announced the expansion of our Grasslands natural gas processing facility in North Dakota,
currently estimated to cost in the range of $40 million to $45 million, excluding AFUDC. The increased project costs are primarily a result of higher contract labor and equipment costs. The Grasslands facility is our largest natural gas processing
plant in the Williston Basin. The expansion increases processing capacity to approximately 100 MMcf/d from its current capacity of 63 MMcf/d and increases fractionation capacity to approximately 12 MBbl/d from 8 MBbl/d. The expansion project is
expected to come on-line in phases, with the final phase currently expected to be on-line in the second half of 2008. This project is in our Natural Gas Gathering and Processing segment.

Fort Union Gas Gathering Expansion - In January 2007, Fort Union Gas Gathering announced plans to double its existing gathering pipeline capacity by adding 148 miles of new gathering lines, resulting in
approximately 649 MMcf/d of additional capacity in the Powder River basin of Wyoming. The expansion occurred in two phases and is currently expected to cost in the range of $120 million to $130 million, excluding AFUDC, which was primarily
financed within the Fort Union Gas Gathering partnership. Any cost overruns are covered through escalation clauses to preserve the original economics of the project. Phase I, with more than 200 MMcf/d capacity, was placed in service during the
fourth quarter of 2007. Phase II, with approximately 450 MMcf/d capacity, was completed in July 2008. The additional capacity has been fully subscribed for 10 years. We own approximately 37 percent of Fort Union Gas Gathering. This
investment is in our Natural Gas Gathering and Processing segment and is accounted for under the equity method of accounting.

Guardian Pipeline
Expansion and Extension - In December 2007, Guardian Pipeline received and accepted the certificate of public convenience and necessity issued by the FERC for its expansion and extension project. The certificate authorizes us to construct,
install and operate approximately 119 miles of a 20-inch and 30-inch natural gas transportation pipeline with a capacity to transport 537 MMcf/d of natural gas north from Ixonia, Wisconsin, to the Green Bay, Wisconsin, area. The project is supported
by 15-year shipper commitments with We Energies and Wisconsin Public Service Corporation and the capacity has been fully subscribed. The project is currently estimated to cost in the range of $277 million to $305 million, excluding AFUDC. The higher
estimated costs are primarily due to weather delays, construction in environmentally sensitive areas, rocky terrain, escalating costs associated with crop damage and condemnation costs. We received the notice



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to proceed from the FERC in May 2008. The pipeline is currently projected to be in service in the fourth quarter of 2008. This project is in our Natural Gas
Pipelines segment.

IMPACT OF NEW ACCOUNTING STANDARDS

Information about the impact of the following new accounting standards is included in Note A of the Notes to Consolidated Financial Statements in this Quarterly Report on Form 10-Q:

| |  |  | Statement 157, Fair Value Measurements,
| | - |  | -----------------------------------------

| |  |  | Statement 159, The Fair Value Option for Financial Assets and Financial Liabilities,
| | - |  | --------------------------------------------------------------------------------------

| |  |  | FASB Staff Position No. FIN 39-1, Amendment of FASB Interpretation No. 39,
| | - |  | ----------------------------------------------------------------------------

| |  |  | Statement 141R, Business Combinations,
| | - |  | ----------------------------------------

| |  |  | Statement 160, Noncontrolling Interests in Consolidated Financial Statementsan amendment of ARB No. 51,
| | - |  | ----------------------------------------------------------------------------------------------------------

| |  |  | Statement 161, Disclosures about Derivative Instruments and Hedging Activitiesan amendment to FASB Statement No. 133, and
| | - |  | ----------------------------------------------------------------------------------------------------------------------------

| |  |  | EITF 07-4, Application of the Two-Class Method under FASB Statement No. 128 to Master Limited Partnerships.
| | - |  | -------------------------------------------------------------------------------------------------------------

CRITICAL ACCOUNTING POLICIES AND ESTIMATES

The preparation of our
consolidated financial statements and related disclosures in accordance with GAAP requires us to make estimates and assumptions with respect to values or conditions that cannot be known with certainty that affect the reported amount of assets and
liabilities, and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements. These estimates and assumptions also affect the reported amounts of revenues and expenses during the reporting period.
Although we believe these estimates and assumptions are reasonable, actual results could differ from our estimates.

Information about our critical
accounting estimates is included under Item 7, Managements Discussion and Analysis of Financial Condition and Results of Operations, Critical Accounting Policies and Estimates, in our Annual Report on Form 10-K for the year
ended December 31, 2007.

FINANCIAL AND OPERATING RESULTS

Consolidated Operations

Selected Financial Information - The following table sets forth certain selected consolidated financial
information for the periods indicated.



|                                                    |  |                            |           |   |                          |   |           |      |  |   |           |   |  |   |           |   |  | 
|--------------------------------------------------- |  | -------------------------- | --------- | - | ------------------------ | - | --------- | ---- |  | - | --------- | - |  | - | --------- | - |  | 
|                                                    |  | Three Months EndedJune 30, |           |   | Six Months EndedJune 30, |   |           |     
|Financial Results                                   |  | 2008                       |           |   | 2007                     |   |           | 2008 |  |   | 2007      |   |  |  
|                                                    |  | (Thousands of dollars)     |           |   |                         
|Revenues                                            |  | $                          | 2,143,892 |   |                          | $ | 1,375,314 |      |  | $ | 4,202,927 |   |  | $ | 2,543,988 |   |  | 
|Cost of sales and fuel                              |  |                            | 1,862,959 |   |                          |   | 1,157,744 |      |  |   | 3,653,469 |   |  |   | 2,121,048 |   |  | 
|Net margin                                          |  |                            | 280,933   |   |                          |   | 217,570   |      |  |   | 549,458   |   |  |   | 422,940   |   |  | 
|Operating costs                                     |  |                            | 87,158    |   |                          |   | 81,620    |      |  |   | 175,240   |   |  |   | 157,304   |   |  | 
|Depreciation and amortization                       |  |                            | 30,033    |   |                          |   | 28,013    |      |  |   | 59,975    |   |  |   | 55,526    |   |  | 
|Gain (loss) on sale of assets                       |  |                            | (3        | ) |                          |   | (379      | )    |  |   | 28        |   |  |   | 1,824     |   |  | 
|Operating income                                    |  | $                          | 163,739   |   |                          | $ | 107,558   |      |  | $ | 314,271   |   |  | $ | 211,934   |   |  | 
|                                                   
|Equity earnings from investments                    |  | $                          | 17,610    |   |                          | $ | 18,758    |      |  | $ | 45,393    |   |  | $ | 42,813    |   |  | 
|Allowance for equity funds used during construction |  | $                          | 11,676    |   |                          | $ | 1,658     |      |  | $ | 20,172    |   |  | $ | 2,995     |   |  | 
|Interest expense                                    |  | $                          | (34,705   | ) |                          | $ | (33,503   | )    |  | $ | (73,234   | ) |  | $ | (65,803   | ) |  | 



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Operating Results - Net margin increased for the three and six months ended June 30, 2008, compared with the
same periods last year, primarily due to the following:

| |  |  | higher realized commodity prices in our Natural Gas Gathering and Processing segment,
| | - |  | -------------------------------------------------------------------------------------

| |  |  | new supply connections and increased fractionation volumes in our Natural Gas Liquids Gathering and Fractionation segment,
| | - |  | --------------------------------------------------------------------------------------------------------------------------

| |  |  | wider regional product price differentials in our Natural Gas Liquids Gathering and Fractionation segment, and
| | - |  | --------------------------------------------------------------------------------------------------------------

| |  |  | incremental net margin in our Natural Gas Liquids Pipelines segment from the assets acquired from Kinder Morgan in October 2007.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------

Operating costs increased for the three and six months ended June 30, 2008, compared with the same periods last year, primarily due to incremental operating
expenses associated with the assets acquired from Kinder Morgan, increased costs for outside services and chemicals, and higher employee-related costs.

Depreciation and amortization increased for the three and six months ended June 30, 2008, compared with the same periods last year, primarily due to the assets acquired from Kinder Morgan and depreciation expense associated with our
completed capital projects.

Equity earnings from investments decreased for the three months ended June 30, 2008, compared with the same period last
year, primarily due to decreased throughput on Northern Border Pipeline, in which we own a 50 percent interest.

Equity earnings from investments increased
for the six months ended June 30, 2008, compared with the same period last year, primarily due to higher gathering revenues in our Natural Gas Gathering and Processing segments various investments.

Allowance for equity funds used during construction increased for the three and six months ended June 30, 2008, compared with the same periods last year, due to our
capital projects, which are discussed beginning on page 20.

Additional information regarding our results of operations is provided in the following
discussion of operating results for each of our segments.

Natural Gas Gathering and Processing

Overview - Our Natural Gas Gathering and Processing segments operations include gathering of natural gas production from crude oil and natural gas wells. We
gather unprocessed natural gas in the Mid-Continent region, which includes the Anadarko Basin of Oklahoma and the Hugoton and Central Kansas Uplift Basins of Kansas. We also gather unprocessed natural gas in two producing basins in the Rocky
Mountain region: the Williston Basin, which spans portions of Montana, North Dakota and the Canadian province of Saskatchewan and the Powder River Basin of Wyoming.

Through gathering systems, unprocessed natural gas volumes are aggregated for removal of water vapor, solids and other contaminants and to extract NGLs in order to provide marketable natural gas, commonly referred to
as residue gas. When the liquids are separated from the unprocessed natural gas at the processing plants, the liquids are in the form of a mixed, unfractionated NGL stream. This unfractionated NGL stream is generally shipped to fractionators, where
by applying heat and pressure, the unfractionated NGL stream is separated into marketable purity products, such as ethane/propane mix, propane, iso-butane, normal butane and natural gasoline (collectively, NGL products). These NGL products are
marketed to a diverse customer base.



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Selected Financial and Operating Information - The following tables set forth certain selected financial and
operating results for our Natural Gas Gathering and Processing segment for the periods indicated.



|                                                                           |  |                            |           |   |                           |   |           |      |  |   |           |   |  |   |           |   |  | 
|-------------------------------------------------------------------------- |  | -------------------------- | --------- | - | ------------------------- | - | --------- | ---- |  | - | --------- | - |  | - | --------- | - |  | 
|                                                                           |  | Three Months EndedJune 30, |           |   | Six Months EndedJune 30,  |   |           |     
|Financial Results                                                          |  | 2008                       |           |   | 2007                      |   |           | 2008 |  |   | 2007      |   |  |  
|                                                                           |  | (Thousands of dollars)     |           |   |                          
|Natural gas liquids and condensate sales                                   |  | $                          | 259,293   |   |                           | $ | 156,378   |      |  | $ | 470,939   |   |  | $ | 286,454   |   |  | 
|Gas sales                                                                  |  |                            | 240,567   |   |                           |   | 169,684   |      |  |   | 427,246   |   |  |   | 328,384   |   |  | 
|Gathering, compression, dehydration and processing fees and other revenues |  |                            | 38,873    |   |                           |   | 36,695    |      |  |   | 77,118    |   |  |   | 70,800    |   |  | 
|Cost of sales and fuel                                                     |  |                            | 417,613   |   |                           |   | 274,353   |      |  |   | 750,277   |   |  |   | 523,867   |   |  | 
|Net margin                                                                 |  |                            | 121,120   |   |                           |   | 88,404    |      |  |   | 225,026   |   |  |   | 161,771   |   |  | 
|Operating costs                                                            |  |                            | 32,790    |   |                           |   | 30,601    |      |  |   | 65,887    |   |  |   | 64,591    |   |  | 
|Depreciation and amortization                                              |  |                            | 12,141    |   |                           |   | 11,145    |      |  |   | 23,898    |   |  |   | 22,267    |   |  | 
|Gain (loss) on sale of assets                                              |  |                            | (6        | ) |                           |   | (384      | )    |  |   | (5        | ) |  |   | 1,813     |   |  | 
|Operating income                                                           |  | $                          | 76,183    |   |                           | $ | 46,274    |      |  | $ | 135,236   |   |  | $ | 76,726    |   |  | 
|                                                                          
|Equity earnings from investments                                           |  | $                          | 8,126     |   |                           | $ | 7,730     |      |  | $ | 15,170    |   |  | $ | 13,338    |   |  | 
|                                                                           |  |                            |          
|                                                                           |  | Three Months EndedJune 30, |           |   | Six Months Ended June 30, |   |           |     
|Operating Information                                                      |  | 2008                       |           |   | 2007                      |   |           | 2008 |  |   | 2007      |   |  |  
|Natural gas gathered (BBtu/d)                                              |  |                            | 1,185     |   |                           |   | 1,188     |      |  |   | 1,188     |   |  |   | 1,178     |   |  | 
|Natural gas processed(BBtu/d)                                              |  |                            | 651       |   |                           |   | 619       |      |  |   | 637       |   |  |   | 614       |   |  | 
|Natural gas liquids sales (MBbl/d)                                         |  |                            | 40        |   |                           |   | 38        |      |  |   | 39        |   |  |   | 37        |   |  | 
|Natural gas sales (BBtu/d)                                                 |  |                            | 281       |   |                           |   | 273       |      |  |   | 279       |   |  |   | 271       |   |  | 
|Capital expenditures (Thousands of dollars)                                |  | $                          | 36,348    |   |                           | $ | 23,612    |      |  | $ | 62,835    |   |  | $ | 39,928    |   |  | 
|Realized composite NGL sales price ($/gallon)                              |  | $                          | 1.49      |   |                           | $ | 0.99      |      |  | $ | 1.41      |   |  | $ | 0.91      |   |  | 
|Realized condensate sales price ($/Bbl)                                    |  | $                          | 102.77    |   |                           | $ | 59.79     |      |  | $ | 95.82     |   |  | $ | 58.06     |   |  | 
|Realized natural gas sales price ($/MMBtu)                                 |  | $                          | 9.42      |   |                           | $ | 6.83      |      |  | $ | 8.41      |   |  | $ | 6.71      |   |  | 
|Realized gross processing spread ($/MMBtu)                                 |  | $                          | 6.69      |   |                           | $ | 4.55      |      |  | $ | 7.06      |   |  | $ | 4.08      |   |  | 
|                                                                           |  |                            |          
|                                                                           |  | Three Months EndedJune 30, |           |   | Six Months Ended June 30, |   |           |     
|                                                                           |  | 2008                       |           |   | 2007                      |   |           | 2008 |  |   | 2007      |   |  |  
|Percent of proceeds                                                        |  |                            |           |   |                           |   |           |      |  |   |           |   |  |   |           |   |  | 
|Wellhead purchases (MMBtu/d)                                               |  |                            | 69,389    |   |                           |   | 86,281    |      |  |   | 69,960    |   |  |   | 91,325    |   |  | 
|NGL sales (Bbl/d)                                                          |  |                            | 6,475     |   |                           |   | 6,113     |      |  |   | 6,107     |   |  |   | 6,044     |   |  | 
|Residue sales (MMBtu/d)                                                    |  |                            | 36,947    |   |                           |   | 30,441    |      |  |   | 36,776    |   |  |   | 30,406    |   |  | 
|Condensate sales(Bbl/d)                                                    |  |                            | 1,070     |   |                           |   | 740       |      |  |   | 1,092     |   |  |   | 711       |   |  | 
|Percentage of total net margin                                             |  |                            | 64        | % |                           |   | 57        | %    |  |   | 62        | % |  |   | 57        | % |  | 
|Fee-based                                                                  |  |                            |           |   |                           |   |           |      |  |   |           |   |  |   |           |   |  | 
|Wellhead volumes (MMBtu/d)                                                 |  |                            | 1,184,654 |   |                           |   | 1,188,139 |      |  |   | 1,188,169 |   |  |   | 1,178,325 |   |  | 
|Average rate ($/MMBtu)                                                     |  | $                          | 0.26      |   |                           | $ | 0.25      |      |  | $ | 0.26      |   |  | $ | 0.25      |   |  | 
|Percentage of total net margin                                             |  |                            | 21        | % |                           |   | 32        | %    |  |   | 22        | % |  |   | 33        | % |  | 
|Keep-whole                                                                 |  |                            |           |   |                           |   |           |      |  |   |           |   |  |   |           |   |  | 
|NGL shrink (MMBtu/d)                                                       |  |                            | 22,433    |   |                           |   | 23,837    |      |  |   | 22,970    |   |  |   | 24,351    |   |  | 
|Plant fuel (MMBtu/d)                                                       |  |                            | 2,313     |   |                           |   | 2,788     |      |  |   | 2,400     |   |  |   | 2,924     |   |  | 
|Condensate shrink (MMBtu/d)                                                |  |                            | 2,242     |   |                           |   | 2,223     |      |  |   | 2,127     |   |  |   | 2,546     |   |  | 
|Condensate sales (Bbl/d)                                                   |  |                            | 454       |   |                           |   | 450       |      |  |   | 430       |   |  |   | 515       |   |  | 
|Percentage of total net margin                                             |  |                            | 15        | % |                           |   | 11        | %    |  |   | 16        | % |  |   | 10        | % |  | 



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Operating Results - Net margin increased $32.7 million for the three months ended June 30, 2008, compared
with the same period last year, primarily due to the following:

| |  |  | an increase of $23.4 million due to higher realized commodity prices,
| | - |  | ---------------------------------------------------------------------

| |  |  | an increase of $5.2 million due to higher volumes sold and processed, and
| | - |  | -------------------------------------------------------------------------

| |  |  | an increase of $4.1 million due to improved contract terms.
| | - |  | -----------------------------------------------------------

Net margin increased $63.3 million for the six months ended June 30, 2008, compared with the same period last year, primarily due to the following:

| |  |  | an increase of $47.9 million due to higher realized commodity prices,
| | - |  | ---------------------------------------------------------------------

| |  |  | an increase of $9.2 million due to higher volumes sold and processed, and
| | - |  | -------------------------------------------------------------------------

| |  |  | an increase of $6.2 million due to improved contract terms.
| | - |  | -----------------------------------------------------------

Operating costs increased $2.2 million and $1.3 million for the three-month and six-month periods in 2008, respectively, primarily due to a favorable legal settlement received in June 2007, which reduced legal costs for the three and six
months ended June 30, 2007. Operating costs for the 2008 periods also increased due to increased chemical and outside service costs, partially offset by decreased equipment lease costs, primarily associated with the Bushton Plant.

Depreciation and amortization increased $1.6 million for the six months ended June 30, 2008, compared with the same period last year, primarily as a result of
depreciation expense associated with our completed capital projects.

The increase in equity earnings from investments for the six-month period in 2008 is
driven primarily by higher gathering revenues in our various investments.

The increase in capital expenditures for the three and six months ended
June 30, 2008, compared with the same periods last year, is driven primarily by our capital projects, which are discussed beginning on page 20.

Our
Natural Gas Gathering and Processing segment is exposed to commodity price risk, primarily from NGLs, as a result of our contractual obligations for services provided. A small percentage of our services, based on volume, is provided through
keep-whole arrangements. See discussion regarding our commodity price risk beginning on page 36 under Commodity Price Risk in Item 3, Quantitative and Qualitative Disclosures about Market Risk.

Natural Gas Pipelines

Overview - Our Natural Gas Pipelines
segment primarily operates regulated natural gas transmission pipelines, natural gas storage facilities, and non-processable natural gas gathering facilities. We also provide interstate natural gas transportation and storage service in accordance
with Section 311(a) of the Natural Gas Policy Act.

Our interstate natural gas pipeline assets transport natural gas through FERC-regulated interstate
natural gas pipelines in Montana, North Dakota, South Dakota, Minnesota, Wisconsin, Iowa, Illinois, Indiana, Kentucky, Tennessee, Oklahoma, Texas and New Mexico. Our interstate pipelines include Midwestern Gas Transmission, Guardian Pipeline, Viking
Gas Transmission Company, OkTex Pipeline and a 50 percent interest in Northern Border Pipeline.

Our intrastate natural gas pipeline assets in Oklahoma
have access to the major natural gas producing areas and transport natural gas throughout the state. We also have access to the major natural gas producing area in south central Kansas. In Texas, our intrastate natural gas pipelines are connected to
the major natural gas producing areas in the Texas panhandle and the Permian Basin, and transport natural gas to the Waha Hub, where other pipelines may be accessed for transportation east to the Houston Ship Channel market, north into the
Mid-Continent market and west to the California market.

We own or lease storage capacity in underground natural gas storage facilities in Oklahoma, Kansas
and Texas.

Our transportation contracts for our regulated natural gas activities are based upon rates stated in our tariffs. Tariffs specify the maximum
rates customers can be charged, which can be discounted to meet competition if necessary, and the general terms and conditions for pipeline transportation service, which are established at FERC or appropriate state jurisdictional agency proceedings
known as rate cases. In Texas and Kansas, natural gas storage service is a fee business that may be regulated by the state in which the facility operates and by the FERC for certain types of services. In Oklahoma, natural gas gathering and natural
gas storage operations are not subject to rate regulation and have market-based rate authority from the FERC for certain types of services.



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Selected Financial and Operating Information  The following tables set forth certain selected financial and
operating results for our Natural Gas Pipelines segment for the periods indicated.



|                                                         |  |                            |        |                          |      |   |        |  |   |         |   |  |   |         |  | 
|-------------------------------------------------------- |  | -------------------------- | ------ | ------------------------ | ---- | - | ------ |  | - | ------- | - |  | - | ------- |  | 
|                                                         |  | Three Months EndedJune 30, |        | Six Months EndedJune 30, |      |  
|Financial Results                                        |  | 2008                       |        |                          | 2007 |   | 2008   |  |   | 2007    |   | 
|                                                         |  |                           
|                                                         |  | (Thousands of dollars)     |        |                         
|Transportation revenues                                  |  | $                          | 62,631 |                          |      | $ | 53,150 |  | $ | 125,264 |   |  | $ | 114,581 |  | 
|Storage revenues                                         |  |                            | 17,912 |                          |      |   | 14,912 |  |   | 32,270  |   |  |   | 27,405  |  | 
|Gas sales and other revenues                             |  |                            | 9,253  |                          |      |   | 1,286  |  |   | 22,434  |   |  |   | 4,375   |  | 
|Cost of sales                                            |  |                            | 23,080 |                          |      |   | 11,407 |  |   | 49,557  |   |  |   | 26,928  |  | 
|Net margin                                               |  |                            | 66,716 |                          |      |   | 57,941 |  |   | 130,411 |   |  |   | 119,433 |  | 
|Operating costs                                          |  |                            | 20,468 |                          |      |   | 24,730 |  |   | 44,048  |   |  |   | 45,844  |  | 
|Depreciation and amortization                            |  |                            | 8,522  |                          |      |   | 8,137  |  |   | 16,940  |   |  |   | 16,157  |  | 
|Gain on sale of assets                                   |  |                            | (35    | )                        |      |   | 3      |  |   | (18     | ) |  |   | 6       |  | 
|Operating income                                         |  | $                          | 37,691 |                          |      | $ | 25,077 |  | $ | 69,405  |   |  | $ | 57,438  |  | 
|                                                        
|Equity earnings from investments                         |  | $                          | 9,153  |                          |      | $ | 10,614 |  | $ | 29,214  |   |  | $ | 28,782  |  | 
|Allowance for equity funds used during construction      |  | $                          | 2,403  |                          |      | $ | 672    |  | $ | 4,482   |   |  | $ | 1,105   |  | 
|                                                         |  |                            |       
|                                                         |  | Three Months EndedJune 30, |        | Six Months EndedJune 30, |      |  
|Operating Information (a)                                |  | 2008                       |        |                          | 2007 |   | 2008   |  |   | 2007    |   | 
|Natural gas transported (MMcf/d)                         |  |                            | 3,455  |                          |      |   | 3,333  |  |   | 3,706   |   |  |   | 3,639   |  | 
|Average natural gas price Mid-Continent region ($/MMBtu) |  | $                          | 9.20   |                          |      | $ | 6.53   |  | $ | 8.19    |   |  | $ | 6.41    |  | 
|Capital expenditures (Thousands of dollars)              |  | $                          | 29,766 |                          |      | $ | 28,424 |  | $ | 51,988  |   |  | $ | 46,074  |  | 

(a)  -  Includes volumes for consolidated entities only.

Operating Results - Net margin increased $8.8 million for the three months ended June 30, 2008, compared with the same period last year, primarily due to:

| |  |  | an increase of $5.5 million due to higher natural gas transportation margins, primarily as a result of the higher natural gas price impact on our retained fuel and
higher throughput,
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | an increase of $2.2 million due to higher natural gas storage margins, primarily related to new and renegotiated natural gas storage contracts, and
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | an increase of $1.1 million due to increased operational natural gas inventory sales.
| | - |  | -------------------------------------------------------------------------------------

Net margin increased $11.0 million for the six months ended June 30, 2008, compared with the same period last year, primarily due to:

| |  |  | an increase of $5.2 million due to higher natural gas transportation margins, primarily as a result of the higher natural gas price impact on our retained fuel,
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | an increase of $4.1 million due to higher natural gas storage margins, primarily related to new and renegotiated natural gas storage contracts and the higher
natural gas price impact on our retained fuel, and
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | an increase of $1.9 million due to increased operational natural gas inventory sales.
| | - |  | -------------------------------------------------------------------------------------

Operating costs decreased $4.3 million for the three months ended June 30, 2008, compared with the same period last year, primarily due to decreased general taxes
and lower general operating costs.

Operating costs decreased $1.8 million for the six months ended June 30, 2008, compared with the same period last
year, primarily due to decreased general taxes.

Equity earnings from investments decreased $1.5 million for the three months ended June 30, 2008,
compared with the same period last year, primarily due to decreased throughput on Northern Border Pipeline, in which we own a 50 percent interest.

The
increase in allowance for equity funds used during construction and capital expenditures for the three and six months ended June 30, 2008, compared with the same periods last year, is driven primarily by our capital projects, which are
discussed beginning on page 20.



26



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##### Table of Contents

Natural Gas Liquids Gathering and Fractionation

Overview - Our Natural Gas Liquids Gathering and Fractionation segment primarily gathers, treats and fractionates NGLs produced by natural gas processing plants located in Oklahoma, Kansas, the Texas panhandle
and the Texas Gulf Coast, and stores and markets NGL products. We connect the NGL production basins in Oklahoma, Kansas and the Texas panhandle with the key natural gas liquids market centers in Conway, Kansas, and Mont Belvieu, Texas.

Most natural gas produced at the wellhead contains a mixture of NGL components such as ethane, propane, iso-butane, normal butane and natural gasoline. Natural gas
processing plants remove the NGLs from the natural gas stream to realize the higher economic value of the NGLs and to meet natural gas pipeline quality specifications, which limit NGLs in the natural gas stream due to liquid and Btu content. The
NGLs that are separated from the natural gas stream at the natural gas processing plants remain in a mixed, unfractionated form until they are gathered, primarily by pipeline, and delivered to our fractionators. A fractionator, by applying heat and
pressure, separates the unfractionated NGL stream into marketable purity products, such as ethane/propane mix, propane, iso-butane, normal butane and natural gasoline (collectively, NGL products). These NGL products are then stored and/or
distributed to our customers, such as petrochemical plants, heating fuel users and motor gasoline manufacturers.

Revenues for this segment are primarily
derived from exchange services, optimization, isomerization and storage.

| |  |  | Our exchange services business collects fees to gather, fractionate and treat unfractionated NGLs, thereby converting them into NGL products that are stored and
shipped to a market center or customer-designated location.
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | Our optimization business utilizes our asset base, contract portfolio and market knowledge to capture locational and seasonal price differentials. We move NGL
products between Conway, Kansas, and Mont Belvieu, Texas, in order to capture the locational price differentials between the two market centers. Our NGL storage facilities in the Mid-Continent and Gulf Coast regions are used to capture seasonal
price variances.
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | Our isomerization business captures the price differential when normal butane is converted into the more valuable iso-butane at an isomerization unit in Conway,
Kansas. Iso-butane is used in the refining industry to upgrade the octane of motor gasoline.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | Our storage business collects fees to store NGLs in Conway, Kansas, and Mont Belvieu, Texas.
| | - |  | --------------------------------------------------------------------------------------------

Selected Financial and Operating Information - The following tables set forth certain selected financial and operating results for our Natural Gas Liquids
Gathering and Fractionation segment for the periods indicated.



|                                                                               |  |                             |           |                           |   |           |  |      |           |  |   |           |  | 
|------------------------------------------------------------------------------ |  | --------------------------- | --------- | ------------------------- | - | --------- |  | ---- | --------- |  | - | --------- |  | 
|                                                                               |  | Three Months EndedJune 30,  |           | Six Months Ended June 30, |   |          
|Financial Results                                                              |  | 2008                        |           | 2007                      |   | 2008      |  | 2007 |           | 
|                                                                               |  | (Thousands of dollars)      |           |                          
|Natural gas liquids and condensate sales                                       |  | $                           | 1,652,077 |                           | $ | 996,439   |  | $    | 3,278,180 |  | $ | 1,796,604 |  | 
|Storage and fractionation revenues                                             |  |                             | 87,027    |                           |   | 71,196    |  |      | 167,444   |  |   | 131,963   |  | 
|Cost of sales and fuel                                                         |  |                             | 1,671,765 |                           |   | 1,013,222 |  |      | 3,308,760 |  |   | 1,822,099 |  | 
|Net margin                                                                     |  |                             | 67,339    |                           |   | 54,413    |  |      | 136,864   |  |   | 106,468   |  | 
|Operating costs                                                                |  |                             | 19,990    |                           |   | 16,874    |  |      | 38,621    |  |   | 31,600    |  | 
|Depreciation and amortization                                                  |  |                             | 5,668     |                           |   | 5,754     |  |      | 11,287    |  |   | 11,086    |  | 
|Gain on sale of assets                                                         |  |                             | 6         |                           |   | 2         |  |      | 18        |  |   | 4         |  | 
|Operating income                                                               |  | $                           | 41,687    |                           | $ | 31,787    |  | $    | 86,974    |  | $ | 63,786    |  | 
|                                                                              
|                                                                               |  |                             |          
|                                                                               |  | Three Months Ended June 30, |           | Six Months Ended June 30, |   |          
|Operating Information                                                          |  | 2008                        |           | 2007                      |   | 2008      |  | 2007 |           | 
|Natural gas liquids gathered (MBbl/d)                                          |  |                             | 253       |                           |   | 224       |  |      | 252       |  |   | 217       |  | 
|Natural gas liquids sales (MBbl/d)                                             |  |                             | 265       |                           |   | 221       |  |      | 275       |  |   | 221       |  | 
|Natural gas liquids fractionated (MBbl/d)                                      |  |                             | 371       |                           |   | 349       |  |      | 381       |  |   | 334       |  | 
|Conway-to-Mont Belvieu OPIS average differential Ethane/Propane mix ($/gallon) |  | $                           | 0.13      |                           | $ | 0.05      |  | $    | 0.11      |  | $ | 0.05      |  | 
|Capital expenditures (Thousands of dollars)                                    |  | $                           | 55,048    |                           | $ | 15,114    |  | $    | 84,619    |  | $ | 22,589    |  | 



27



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##### Table of Contents

Operating Results - Net margin increased $12.9 million for the three months ended June 30, 2008, compared
with the same period last year, primarily due to the following:

| |  |  | an increase of $11.7 million due to higher exchange margins, primarily driven by increased volumes due to new supply connections and increased fractionation
volumes,
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | an increase of $3.2 million due to wider regional product price differentials, and
| | - |  | ----------------------------------------------------------------------------------

| |  |  | an increase of $1.4 million due to higher storage margins in our Mid-Continent storage business, partially offset by
| | - |  | --------------------------------------------------------------------------------------------------------------------

| |  |  | a decrease of $3.4 million due to lower isomerization volume resulting from narrower iso-butane-to-normal butane price differentials.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------

Net margin increased $30.4 million for the six months ended June 30, 2008, compared with the same period last year, primarily due to the following:

| |  |  | an increase of $16.8 million due to higher exchange margins, primarily driven by increased volumes due to new supply connections and increased fractionation
volumes,
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | an increase of $16.0 million due to wider regional product price differentials, and
| | - |  | -----------------------------------------------------------------------------------

| |  |  | an increase of $1.9 million due to higher storage margins in our Mid-Continent storage business, partially offset by
| | - |  | --------------------------------------------------------------------------------------------------------------------

| |  |  | a decrease of $4.4 million due to lower isomerization volume resulting from narrower iso-butane-to-normal butane price differentials.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------

Operating costs increased $3.1 million and $7.0 million, respectively, for the three- and six-month periods ended June 30, 2008, compared with the same periods
last year, primarily due to increased equipment lease costs for the Bushton Plant, increased regulatory compliance costs at our natural gas liquids storage facilities, higher employee-related costs and higher maintenance costs at our Mont Belvieu
fractionator.

The increase in capital expenditures for the three and six months ended June 30, 2008, compared with the same periods last year, is
driven primarily by our growth activities for new supply connections. See discussion of our capital projects beginning on page 20.

Natural Gas Liquids
Pipelines

Overview - Our Natural Gas Liquids Pipelines segment primarily operates FERC-regulated natural gas liquids gathering and distribution
pipelines and associated above- and below-ground storage facilities. Our natural gas liquids gathering pipelines deliver unfractionated NGLs gathered in Oklahoma, Kansas and the Texas panhandle to our Natural Gas Liquids Gathering and
Fractionation segments Mid-Continent fractionation facilities. Our natural gas liquids distribution pipelines deliver NGL products to the natural gas liquids market hubs in Conway, Kansas, and Mont Belvieu, Texas. Through our acquisition
of the natural gas liquids assets from Kinder Morgan, we acquired terminal and storage facilities, as well as natural gas liquids and refined petroleum products pipelines that connect our Mid-Continent assets with Midwest markets, including Chicago,
Illinois. Our natural gas liquids gathering and distribution pipelines operate in Oklahoma, Kansas, Nebraska, Missouri, Iowa, Illinois, Indiana and Texas. We have terminal and storage facilities in Missouri, Nebraska, Iowa and
Illinois.

Revenues for this segment are primarily derived from transporting product under our FERC-regulated tariffs. Tariffs specify the
rates we can charge our customers and the general terms and conditions for NGL transportation service on our pipelines. Our tariffs include specifications regarding the receipt and delivery of NGLs at points along the pipeline systems. We generally
charge tariff rates under a FERC-approved indexing methodology, which allows charging rates up to a prescribed ceiling that changes annually based on the year-to-year change in the Producer Price Index for finished goods. The FERC also permits
interstate natural gas liquids pipelines to support rates by using a cost-of-service methodology, competitive market price or an agreement with a pipelines non-affiliated shipper.



28



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##### Table of Contents

Selected Financial and Operating Information - The following tables set forth certain selected financial and
operating results for our Natural Gas Liquids Pipelines segment for the periods indicated.



|                                                    |  |                            |         |                          |   |        |  |      |         |  |   |        |  | 
|--------------------------------------------------- |  | -------------------------- | ------- | ------------------------ | - | ------ |  | ---- | ------- |  | - | ------ |  | 
|                                                    |  | Three Months EndedJune 30, |         | Six Months EndedJune 30, |   |       
|Financial Results                                   |  | 2008                       |         | 2007                     |   | 2008   |  | 2007 |         | 
|                                                    |  | (Thousands of dollars)     |         |                         
|Transportation and gathering revenues               |  | $                          | 33,936  |                          | $ | 18,863 |  | $    | 68,002  |  | $ | 36,510 |  | 
|Storage revenues                                    |  |                            | 437     |                          |   |       |  |      | 3,029   |  |   |       |  | 
|Natural gas liquids sales and other revenues        |  |                            | 403     |                          |   |       |  |      | 2,428   |  |   | 12     |  | 
|Cost of sales and fuel                              |  |                            | 7,407   |                          |   | 1,919  |  |      | 14,733  |  |   | 2,570  |  | 
|Net margin                                          |  |                            | 27,369  |                          |   | 16,944 |  |      | 58,726  |  |   | 33,952 |  | 
|Operating costs                                     |  |                            | 13,782  |                          |   | 5,541  |  |      | 27,185  |  |   | 10,903 |  | 
|Depreciation and amortization                       |  |                            | 3,697   |                          |   | 2,991  |  |      | 7,839   |  |   | 6,003  |  | 
|Gain on sale of assets                              |  |                            |        |                          |   |       |  |      | 1       |  |   | 1      |  | 
|Operating income                                    |  | $                          | 9,890   |                          | $ | 8,412  |  | $    | 23,703  |  | $ | 17,047 |  | 
|                                                   
|Equity earnings from investments                    |  | $                          | 331     |                          | $ | 414    |  | $    | 1,009   |  | $ | 693    |  | 
|Allowance for equity funds used during construction |  | $                          | 9,273   |                          | $ | 986    |  | $    | 15,690  |  | $ | 1,890  |  | 
|                                                    |  |                            |        
|                                                    |  | Three Months EndedJune 30, |         | Six Months EndedJune 30, |   |       
|Operating Information                               |  | 2008                       |         | 2007                     |   | 2008   |  | 2007 |         | 
|Natural gas liquids transported (MBbl/d)            |  |                            | 308     |                          |   | 227    |  |      | 305     |  |   | 216    |  | 
|Natural gas liquids gathered (MBbl/d)               |  |                            | 96      |                          |   | 78     |  |      | 94      |  |   | 74     |  | 
|Capital expenditures (Thousands of dollars)         |  | $                          | 136,354 |                          | $ | 64,677 |  | $    | 325,080 |  | $ | 97,794 |  | 

Operating Results - Net margin increased $10.4 million for the three months ended June 30, 2008,
compared with the same period last year, primarily due to the following:

| |  |  | an increase of $9.4 million due to incremental margin from the assets acquired from Kinder Morgan in October 2007 and
| | - |  | ---------------------------------------------------------------------------------------------------------------------

| |  |  | an increase of $1.1 million due to increased throughput from new supply connections and increased production volumes from existing supply connections to our natural
gas liquids gathering pipelines.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Net margin increased $24.8 million for the six months ended June 30, 2008, compared with the same
period last year, primarily due to the following:

| |  |  | an increase of $22.0 million due to incremental margin from the assets acquired from Kinder Morgan in October 2007 and
| | - |  | ----------------------------------------------------------------------------------------------------------------------

| |  |  | an increase of $2.7 million due to increased throughput from new supply connections and increased production volumes from existing supply connections to our natural
gas liquids gathering pipelines.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Operating costs increased $8.2 million for the three months ended June 30, 2008, compared with the
same period last year, primarily due to $6.5 million in incremental operating expenses associated with the assets acquired from Kinder Morgan, as well as higher employee-related costs.

Operating costs increased $16.3 million for the six months ended June 30, 2008, compared with the same period last year, primarily due to $13.4 million in incremental operating expenses associated with the assets
acquired from Kinder Morgan, as well as higher employee-related costs.

Depreciation and amortization increased $1.8 million for the six months ended
June 30, 2008, primarily due to the assets acquired from Kinder Morgan.

The increase in allowance for equity funds used during construction and
capital expenditures for the three and six months ended June 30, 2008, compared with the same periods last year, is driven primarily by our growth activities. See discussion of our capital projects beginning on page 20.



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##### Table of Contents

Other

In the second
quarter of 2008, we started the decommissioning of the Black Mesa Pipeline, Inc. pipeline and we are in the process of notifying the land owners of this decision. We do not expect the decommissioning to have a material impact on our consolidated
financial statements.

Contingencies

Legal
Proceedings - We are a party to various litigation matters and claims that are in the normal course of our operations. While the results of litigation and claims cannot be predicted with certainty, we believe the final outcome of such matters
will not have a material adverse effect on our consolidated results of operations, financial position or liquidity.

FERC Matter - As a result of an
internal review of a transaction that was brought to the attention of one of our affiliates by a third party, we conducted an internal review of transactions that may have violated FERC natural gas capacity release rules or related rules and
determined that there were transactions that should have been disclosed to the FERC. We notified the FERC of this review and filed a report with the FERC regarding these transactions in March 2008. We are cooperating fully with the FERC and have
taken action to ensure that current and future transactions comply with applicable FERC regulations. We are unable to predict the outcome of any FERC action in this matter. At this time, we do not believe that penalties associated with potential
violations will have a material impact on our results of operations, financial position or liquidity.

LIQUIDITY AND CAPITAL RESOURCES

General - Our principal sources of liquidity include cash generated from operating activities, bank credit facilities, debt issuances and the sale of common
units. We fund our operating expenses, debt service and cash distributions to our limited partners and general partner primarily with operating cash flow.

Part of our growth strategy is to expand our existing businesses and strategically acquire related businesses that strengthen and complement our existing assets. Capital resources for acquisitions and maintenance and growth expenditures may
be funded by a variety of sources, including those listed above as our principal sources of liquidity. Beginning in 2007 and continuing in 2008, the capital markets have been impacted by macroeconomic, liquidity, credit and other recessionary
concerns. During this period, we have continued to have access to our 2007 Partnership Credit Agreement to fund our short-term liquidity needs. In 2008, we issued common units and received additional contributions from our general partner. See
discussion below under Equity Issuance. We also issued $600 million of long-term debt in September 2007. Our ability to continue to access capital markets for debt and equity financing under reasonable terms depends on our financial
condition, credit ratings and market conditions. We anticipate that our existing capital resources, ability to obtain financing and cash flow generated from future operations will enable us to maintain our current level of operations and our planned
operations, including capital expenditures, for the foreseeable future. We have no material guarantees of debt or other similar commitments to unaffiliated parties.

During the six months ended June 30, 2008 and 2007, our capital expenditures were financed through operating cash flows and short- and long-term debt. For the six months ended June 30, 2008, our capital
expenditures were also financed through the issuance of common units. Capital expenditures for the first six months of 2008 were $524.6 million, compared with $206.4 million for the same period in 2007, exclusive of acquisitions. The increase in
capital expenditures for 2008, compared with 2007, is driven primarily by our capital projects, which are discussed beginning on page 20.

Financing
- Financing is provided through available cash, our 2007 Partnership Credit Agreement, the issuance of common units and long-term debt. Other options to obtain financing include, but are not limited to issuance of hybrid securities such as any trust
preferred security or deferrable interest subordinated debt issued by us or any business trusts and sale/leaseback of facilities.

The total amount of
short-term borrowings authorized by our general partners Board of Directors is $1.5 billion. At June 30, 2008, we had $120 million borrowings outstanding and $880 million available under our 2007 Partnership Credit Agreement and available
cash and cash equivalents of approximately $76.4 million. As of June 30, 2008, we could have issued $1.5 billion of additional debt under the most restrictive provisions contained in our various borrowing agreements.

We have a $15 million Senior Unsecured Letter of Credit Facility and Reimbursement Agreement with Wells Fargo Bank, N.A., of which $12 million is currently being used,
and an agreement with Royal Bank of Canada, pursuant to which a $12 million letter of credit was issued. Both agreements are used to support various permits required by the KDHE for our ongoing business in Kansas.



30



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##### Table of Contents

Our 2007 Partnership Credit Agreement contains typical covenants as discussed in Note F of the Notes to Consolidated
Financial Statements in our Annual Report on Form 10-K for the year ended December 31, 2007. At June 30, 2008, we were in compliance with all covenants.

Equity Issuance - In March 2008, we completed a public offering of 2.5 million common units at $58.10 per common unit, generating net proceeds of approximately $140.4 million after deducting underwriting discounts but before
offering expenses. In addition, we sold 5.4 million common units to ONEOK in a private placement, generating proceeds of approximately $303.2 million. In conjunction with the public offering of common units and the private placement, ONEOK
Partners GP contributed $9.4 million in order to maintain its 2 percent general partner interest in us.

In April 2008, we sold an additional 128,873
common units at $58.10 per common unit to the underwriters of the public offering upon the partial exercise of their option to purchase additional common units to cover over-allotments. We received net proceeds of approximately $7.2 million from the
sale of the common units after deducting underwriting discounts but before offering expenses. In conjunction with the partial exercise by the underwriters, ONEOK Partners GP contributed $0.2 million in order to maintain its 2 percent general partner
interest in us. As a result of these transactions, ONEOK now holds an aggregate 47.7 percent interest in us.

We used a portion of the proceeds from the
sale of common units and the general partner contributions to repay borrowings under our 2007 Partnership Credit Agreement.

Capitalization
Structure - The following table sets forth our capitalization structure for the periods indicated.



|                               |  |              |   |  |                  |   |  | 
|------------------------------ |  | ------------ | - |  | ---------------- | - |  | 
|                               |  | June 30,2008 |   |  | December 31,2007 |   |  | 
|Long-term Debt                 |  | 49           | % |  | 54               | % |  | 
|Equity                         |  | 51           | % |  | 46               | % |  | 
|Debt (including notes payable) |  | 50           | % |  | 55               | % |  | 
|Equity                         |  | 50           | % |  | 45               | % |  | 

Credit Ratings - Our investment grade credit ratings as of June 30, 2008, are shown in the table
below.



|              |  |        |  |         |  | 
|------------- |  | ------ |  | ------- |  | 
|Rating Agency |  | Rating |  | Outlook |  | 
|Moodys       |  | Baa2   |  | Stable  |  | 
|S&P           |  | BBB    |  | Stable  |  | 

Our credit ratings may be affected by a material change in our financial ratios or a material event affecting our
business. The most common criteria for assessment of our credit ratings are the debt-to-EBITDA ratio, interest coverage, business risk profile and liquidity. If our credit ratings were downgraded, the interest rates on our 2007 Partnership Credit
Agreement borrowings would increase, resulting in an increase in our cost to borrow funds. An adverse rating change is not a default under our 2007 Partnership Credit Agreement.

Our $250 million and $225 million senior notes, due 2010 and 2011, respectively, contain provisions that require us to offer to repurchase the senior notes at par value if our Moodys or S&P credit rating
falls below investment grade (Baa3 for Moodys or BBB- for S&P) and the investment grade rating is not reinstated within a period of 40 days. Further, the indentures governing our senior notes due 2010 and 2011 include an event of default
upon acceleration of other indebtedness of $25 million or more and the indentures governing our senior notes due 2012, 2016, 2036 and 2037 include an event of default upon the acceleration of other indebtedness of $100 million or more that would be
triggered by such an offer to repurchase. Such an event of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of the outstanding senior notes due 2010, 2011, 2012, 2016, 2036 and 2037 to declare those notes
immediately due and payable in full. We may not have sufficient cash on hand to repurchase and repay any accelerated senior notes, which may cause us to borrow money under our credit facilities or seek alternative financing sources to finance the
repurchases and repayment. We could also face difficulties accessing capital or our borrowing costs could increase, impacting our ability to obtain financing for acquisitions or capital expenditures, to refinance indebtedness and to fulfill our debt
obligations. A decline in our credit rating below investment grade may also require us to provide security to our counterparties in the form of cash, letters of credit or other negotiable instruments.



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##### Table of Contents

Other than the note repurchase obligations described above, we have determined that we do not have significant exposure
to rating triggers in various other contracts and equipment leases. Rating triggers are defined as provisions that would create an automatic default or acceleration of indebtedness based on a change in our credit rating.

Capital Expenditures - We classify expenditures that are expected to generate additional revenues or significant operating efficiencies as growth capital
expenditures. Any remaining capital expenditures are classified as maintenance capital expenditures.

The following table summarizes our 2008 projected
growth and maintenance capital expenditures, excluding AFUDC.



|                                                |  |                       |       |             |   |       |  |   |       |  | 
|----------------------------------------------- |  | --------------------- | ----- | ----------- | - | ----- |  | - | ----- |  | 
|2008 Projected Capital Expenditures             |  | Growth                |       | Maintenance |   | Total |  |  
|                                                |  | (Millions of dollars) |       |            
|Natural Gas Gathering and Processing            |  | $                     | 128   |             | $ | 22    |  | $ | 150   |  | 
|Natural Gas Pipelines                           |  |                       | 224   |             |   | 21    |  |   | 245   |  | 
|Natural Gas Liquids Gathering and Fractionation |  |                       | 143   |             |   | 29    |  |   | 172   |  | 
|Natural Gas Liquids Pipelines                   |  |                       | 735   |             |   | 12    |  |   | 747   |  | 
|Total projected capital expenditures            |  | $                     | 1,230 |             | $ | 84    |  | $ | 1,314 |  | 
|                                               

Additional information about these projects is included under Capital Projects beginning on page 20.
Financing for these projects may include any, or a combination, of the following: cash from operations, borrowings under our 2007 Partnership Credit Agreement, and debt or equity offerings.

Cash Distributions - We distribute 100 percent of our available cash, which generally consists of all cash receipts less adjustments for cash disbursements and
net change to reserves, to our general and limited partners. Our income is allocated to our general partner and limited partners according to their partnership percentages of 2 percent and 98 percent, respectively. The effect of any incremental
income allocations for incentive distributions to our general partner is calculated after the income allocation for the general partners partnership interest and before the income allocation to the limited partners.

The following table sets forth the distribution payments, including our general partners incentive distribution interests, for the periods indicated.



|                   |  |                          |         |      |   |        |  | 
|------------------ |  | ------------------------ | ------- | ---- | - | ------ |  | 
|                   |  | Six Months EndedJune 30, |         |     
|                   |  | 2008                     |         | 2007 |   |       
|                   |  | (Thousands of dollars)   |         |     
|Common unitholders |  | $                        | 104,160 |      | $ | 91,403 |  | 
|Class B unitholder |  |                          | 75,361  |      |   | 71,893 |  | 
|General Partner    |  |                          | 35,273  |      |   | 25,712 |  | 

The following summarizes our quarterly cash distribution activity for 2008.

| |  |  | In January 2008, we increased our cash distribution to $1.025 per unit for the fourth quarter of 2007. The distribution was paid on February 14, 2008, to
unitholders of record on January 31, 2008.
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | In April 2008, we increased our cash distribution to $1.04 per unit for the first quarter of 2008. The distribution was paid on May 15, 2008, to unitholders of
record as of April 30, 2008.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | In July 2008, we increased our cash distribution to $1.06 per unit ($4.24 per unit on an annualized basis) for the second quarter of 2008. The distribution will be
paid on August 14, 2008, to unitholders of record as of July 31, 2008.
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

As an incentive, our general partners percentage
interest in quarterly distributions increases after certain specified target levels are met. For additional information, see Cash Distribution Policy under Part II, Item 5, Market for Registrants Common Equity, Related
Stockholder Matters and Issuer Purchases of Equity Securities, in our Annual Report on Form 10-K for the year ended December 31, 2007.

Commodity
Prices - We are subject to commodity price volatility. Significant fluctuations in commodity prices may impact our overall liquidity due to the impact commodity price changes have on items such as the cost of NGLs and gas held in storage,
increased margin requirements, the cost of transportation to various market locations, collectibility of certain energy-related receivables and working capital. We believe that our current lines of credit are adequate to meet liquidity



32



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##### Table of Contents

requirements associated with commodity price volatility. See discussion beginning on page 36 under Commodity Price Risk in Item 3,
Quantitative and Qualitative Disclosures about Market Risk, for information on our hedging activities.

ENVIRONMENTAL AND SAFETY MATTERS

Environmental Liabilities - We are subject to multiple environmental, historical and wildlife preservation laws and regulations affecting many aspects of our
present and future operations. Regulated activities include those involving air emissions, storm water and wastewater discharges, handling and disposal of solid and hazardous wastes, hazardous materials transportation, and pipeline and facility
construction. These laws and regulations generally require us to obtain and comply with a wide variety of environmental clearances, registrations, licenses, permits and other approvals. Failure to comply with these laws, regulations, permits and
licenses may expose us to fines, penalties and/or interruptions in our operations that could be material to our results of operations. If an accidental leak or spill of hazardous substances or petroleum products occurs from our lines or facilities,
in the process of transporting natural gas, NGLs, or refined products, or at any facility that we own, operate or otherwise use, we could be held jointly and severally liable for all resulting liabilities, including investigation and clean-up costs,
which could materially affect our results of operations and cash flows. In addition, emission controls required under the federal Clean Air Act and other similar federal and state laws could require unexpected capital expenditures at our facilities.
We cannot assure that existing environmental regulations will not be revised or that new regulations will not be adopted or become applicable to us. Revised or additional regulations that result in increased compliance costs or additional operating
restrictions, particularly if those costs are not fully recoverable from customers, could have a material adverse effect on our business, financial condition and results of operations.

Our expenditures for environmental evaluation, mitigation and remediation to date have not been significant in relation to our results of operations, and there were no material effects upon earnings during the six
months ended June 30, 2008 or 2007, related to compliance with environmental regulations.

Pipeline Safety - We are subject to United States
Department of Transportation regulations, including integrity management regulations. The Pipeline Safety Improvement Act requires pipeline companies to perform integrity assessments on pipeline segments that pass through densely populated areas or
near specifically designated high consequence areas. To our knowledge, we are in compliance with all material requirements associated with the various pipeline safety regulations.

Air and Water Emissions - The federal Clean Air Act, the federal Clean Water Act and analogous state laws impose restrictions and controls regarding the discharge of pollutants into the air and water in the
United States. Under the Clean Air Act, a federally-enforceable operating permit is required for sources of significant air emissions. We may be required to incur certain capital expenditures for air pollution-control equipment in connection with
obtaining or maintaining permits and approvals for sources of air emissions. The Clean Water Act imposes substantial potential liability for the removal and remediation of pollutants discharged to waters of the United States. To our knowledge, we
are in compliance with all material requirements associated with the various regulations.

Chemical Site Security - The United States Department of
Homeland Security (Homeland Security) released an interim rule in April 2007 that requires companies to provide reports on sites where certain chemicals, including many hydrocarbon products, are stored. After having received these reports, Homeland
Security is identifying which sites are required to implement minimum security measures. Homeland Security is in the initial stages of implementing this rule, and the full extent to which the rule will require us to undertake additional expenditures
for site security is uncertain at this point.

Climate Change - Our environmental and climate change strategy focuses on taking steps to minimize
the impact of our operations on the environment. These strategies include: (i) developing and maintaining an accurate greenhouse gas emissions inventory, (ii) improving the efficiency of our various pipeline and gas processing facilities,
(iii) following developing technologies for emission control, (iv) following developing technologies to capture carbon dioxide to keep it from reaching the atmosphere, and (v) analyzing options for future energy investment.

Currently, operating entities within our Partnership participate in the Processing and Transmission sectors of the United States Environmental Protection
Agencys Natural Gas STAR Program to voluntarily reduce methane emissions. In addition, we continue to focus on maintaining low rates of lost and unaccounted for gas through expanded implementation of best practices to limit the release of
methane during pipeline and facility maintenance and operations.



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CASH FLOW ANALYSIS

Operating Cash Flows - Operating cash flows decreased by $35.0 million for the six months ended June 30, 2008, compared with the same period in 2007. Our net income increased to $299.5 million for the six months ended
June 30, 2008, compared with $190.4 million for the same period in 2007. This increase was offset by a reduction from changes in working capital.

Investing Cash Flows - Cash used in investing activities was $515.5 million for the six months ended June 30, 2008, compared with $236.3 million for the same period in 2007. The increased use of cash was primarily due to
increased capital expenditures related to our capital projects.

Financing Cash Flows - Cash provided by financing activities was $258.8 million for
the six months ended June 30, 2008, compared with cash used in financing activities of $93.1 million for the same period in 2007.

During the first
six months of 2008, our concurrent public offering and private placement of common units generated proceeds of $450.2 million. In addition, ONEOK Partners GP contributed $9.5 million in order to maintain its 2 percent general partner interest in us.
We used a portion of the proceeds and general partner contributions to repay borrowings under our revolving credit agreement. Borrowings for the first six months of 2008 are the result of our on-going capital projects.

Cash distributions to our general and limited partners for 2008 were $214.8 million, compared with $189.0 million in the same period in 2007, an increase of $25.8
million. This increase was primarily due to the additional units outstanding during 2008 as a result of the concurrent public offering and private placement in March and April 2008, as well as cash distributions of $2.065 per unit for the first six
months of 2008, compared with $1.97 per unit paid in the same period in 2007.

FORWARD-LOOKING STATEMENTS

Some of the statements contained and incorporated in this Quarterly Report on Form 10-Q are forward-looking statements within the meaning of Section 27A of the
Securities Act of 1933, as amended, and Section 21E of the Securities and Exchange Act of 1934, as amended. The forward-looking statements relate to our anticipated financial performance, managements plans and objectives for our future
operations, our business prospects, the outcome of regulatory and legal proceedings, market conditions and other matters. We make these forward-looking statements in reliance on the safe harbor protections provided under the Private Securities
Litigation Reform Act of 1995. The following discussion is intended to identify important factors that could cause future outcomes to differ materially from those set forth in the forward-looking statements.

Forward-looking statements include the items identified in the preceding paragraph, the information concerning possible or assumed future results of our operations and
other statements contained or incorporated in this Quarterly Report on Form 10-Q identified by words such as anticipate, estimate, expect, project, intend, plan,
believe, should, goal, forecast, could, may, continue, might, potential, scheduled and other words and terms of similar meaning.

You should not place undue reliance on forward-looking statements. Known and unknown risks, uncertainties and other factors may cause our actual results,
performance or achievements to be materially different from any future results, performance or achievements expressed or implied by forward-looking statements. Those factors may affect our operations, markets, products, services and prices. In
addition to any assumptions and other factors referred to specifically in connection with the forward-looking statements, factors that could cause our actual results to differ materially from those contemplated in any forward-looking statement
include, among others, the following:

| |  |  | the effects of weather and other natural phenomena on our operations, demand for our services and energy prices;
| | - |  | ----------------------------------------------------------------------------------------------------------------

| |  |  | competition from other United States and Canadian energy suppliers and transporters as well as alternative forms of energy;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------

| |  |  | the capital intensive nature of our businesses;
| | - |  | -----------------------------------------------

| |  |  | the profitability of assets or businesses acquired by us;
| | - |  | ---------------------------------------------------------

| |  |  | risks of marketing, trading and hedging activities, including the risks of changes in energy prices or the financial condition of our counterparties;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | the uncertainty of estimates, including accruals and costs of environmental remediation;
| | - |  | ----------------------------------------------------------------------------------------

| |  |  | the timing and extent of changes in energy commodity prices;
| | - |  | ------------------------------------------------------------

| |  |  | the effects of changes in governmental policies and regulatory actions, including changes with respect to income and other taxes, environmental compliance,
authorized rates or recovery of gas and gas transportation costs;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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| |  |  | impact on drilling and production by factors beyond our control, including the demand for natural gas and refinery-grade crude oil; producers desire and
ability to obtain necessary permits; reserve performance; and capacity constraints on the pipelines that transport crude oil, natural gas and NGLs from producing areas and our facilities;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | changes in demand for the use of natural gas because of market conditions caused by concerns about global warming or changes in governmental policies and
regulations due to climate change initiatives;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | the impact of unforeseen changes in interest rates, equity markets, inflation rates, economic recession and other external factors over which we have no control,
including the effect on pension expense and funding resulting from changes in stock and bond market returns;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | actions by rating agencies concerning the credit ratings of us or our general partner;
| | - |  | --------------------------------------------------------------------------------------

| |  |  | the results of administrative proceedings and litigation, regulatory actions and receipt of expected clearances involving the OCC, KCC, Texas regulatory authorities
or any other local, state or federal regulatory body, including the FERC;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | our ability to access capital at competitive rates or on terms acceptable to us;
| | - |  | --------------------------------------------------------------------------------

| |  |  | risks associated with adequate supply to our gathering, processing, fractionation and pipeline facilities, including production declines which outpace new drilling;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | the risk that material weaknesses or significant deficiencies in our internal control over financial reporting could emerge or that minor problems could become
significant;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | the impact and outcome of pending and future litigation;
| | - |  | --------------------------------------------------------

| |  |  | the ability to market pipeline capacity on favorable terms, including the effects of:
| | - |  | -------------------------------------------------------------------------------------

| | - | future demand for and prices of natural gas and NGLs;
| | - | -----------------------------------------------------

| | - | competitive conditions in the overall energy market;
| | - | ----------------------------------------------------

| | - | availability of supplies of Canadian and United States natural gas;
| | - | -------------------------------------------------------------------

| | - | availability of additional storage capacity;
| | - | --------------------------------------------

| | - | weather conditions; and
| | - | -----------------------

| | - | competitive developments by Canadian and U.S. natural gas transmission peers;
| | - | -----------------------------------------------------------------------------

| |  |  | performance of contractual obligations by our customers, service providers, contractors and shippers;
| | - |  | -----------------------------------------------------------------------------------------------------

| |  |  | the timely receipt of approval by applicable governmental entities for construction and operation of our pipeline and other projects and required regulatory
clearances;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | our ability to acquire all necessary rights-of-way permits and consents in a timely manner, to promptly obtain all necessary materials and supplies required for
construction, and to construct pipelines without labor or contractor problems;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | the mechanical integrity of facilities operated;
| | - |  | ------------------------------------------------

| |  |  | demand for our services in the proximity of our facilities;
| | - |  | -----------------------------------------------------------

| |  |  | our ability to control operating costs;
| | - |  | ---------------------------------------

| |  |  | acts of nature, sabotage, terrorism or other similar acts that cause damage to our facilities or our suppliers or shippers facilities;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------

| |  |  | economic climate and growth in the geographic areas in which we do business;
| | - |  | ----------------------------------------------------------------------------

| |  |  | the risk of a significant slowdown in growth or decline in the U.S. economy or the risk of delay in growth recovery in the U.S. economy;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------

| |  |  | the impact of recently issued and future accounting pronouncements and other changes in accounting policies;
| | - |  | ------------------------------------------------------------------------------------------------------------

| |  |  | the possibility of future terrorist attacks or the possibility or occurrence of an outbreak of, or changes in, hostilities or changes in the political conditions in
the Middle East and elsewhere;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | the risk of increased costs for insurance premiums, security or other items as a consequence of terrorist attacks;
| | - |  | ------------------------------------------------------------------------------------------------------------------

| |  |  | risks associated with pending or possible acquisitions and dispositions, including our ability to finance or integrate any such acquisitions and any regulatory
delay or conditions imposed by regulatory bodies in connection with any such acquisitions and dispositions;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | the impact of unsold pipeline capacity being greater or less than expected;
| | - |  | ---------------------------------------------------------------------------

| |  |  | the ability to recover operating costs and amounts equivalent to income taxes, costs of property, plant and equipment and regulatory assets in our state and
FERC-regulated rates;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | our ability to promptly obtain all necessary materials and supplies required for construction of gathering, processing, storage, fractionation and transportation
facilities;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | the composition and quality of the natural gas and NGLs we gather and process in our plants and transport on our pipelines;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------

| |  |  | the efficiency of our plants in processing natural gas and extracting and fractionating NGLs;
| | - |  | ---------------------------------------------------------------------------------------------

| |  |  | the impact of potential impairment charges;
| | - |  | -------------------------------------------

| |  |  | the risk inherent in the use of information systems in our respective businesses, implementation of new software and hardware, and the impact on the timeliness of
information for financial reporting;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | our ability to control construction costs and completion schedules of our pipelines and other projects; and
| | - |  | -----------------------------------------------------------------------------------------------------------



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| |  |  | the risk factors listed in the reports we have filed and may file with the SEC, which are incorporated by reference.
| | - |  | --------------------------------------------------------------------------------------------------------------------

These factors are not necessarily all of the important factors that could cause actual results to differ materially from those expressed in any of our forward-looking
statements. Other factors could also have material adverse effects on our future results. These and other risks are described in greater detail in Part I, Item 1A, Risk Factors, in our Annual Report on Form 10-K for the year ended
December 31, 2007. All forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by these factors. Other than as required under securities laws, we undertake no obligation to update
publicly any forward-looking statement whether as a result of new information, subsequent events or change in circumstances, expectations or otherwise.



|ITEM 3. | QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
|------- | ----------------------------------------------------------

Our
quantitative and qualitative disclosures about market risk are consistent with those discussed in Part II, Item 7A, Quantitative and Qualitative Disclosures About Market Risk in our Annual Report on Form 10-K for the year ended
December 31, 2007, except that beginning January 1, 2008, we determine the fair value of our derivative instruments in accordance with Statement 157. See Notes A and C of the Notes to Consolidated Financial Statements in this Quarterly
Report on Form 10-Q for further discussion of Statement 157.

INTEREST RATE RISK

General - We are subject to the risk of interest rate fluctuation in the normal course of business. We manage interest rate risk through the use of fixed-rate debt, floating-rate debt and, at times,
interest-rate swaps. Fixed-rate swaps are used to reduce our risk of increased interest costs during periods of rising interest rates. Floating-rate swaps are used to convert the fixed rates of long-term borrowings into short-term variable rates. At
June 30, 2008, the interest rate on all of our long-term debt was fixed.

Fair Value Hedges - See Note D of the Notes to Consolidated Financial
Statements in this Quarterly Report on Form 10-Q for discussion of interest-rate swaps and interest expense savings from terminated swaps.

Total interest
expense savings from amortization of terminated swaps for 2008 will be $3.7 million, compared with total net swap savings of $2.5 million in 2007.

COMMODITY PRICE RISK

Our Natural Gas Gathering and Processing segment is exposed to commodity price risk, primarily NGLs, as a result of
receiving commodities in exchange for our services. To a lesser extent, exposures arise from the relative price differential between NGLs and natural gas, or the gross processing spread, with respect to our keep-whole processing contracts. We are
also exposed to the risk of price fluctuations and the cost of intervening transportation at various market locations. We use commodity fixed-price physical forwards and derivative contracts, including NYMEX-based futures and over-the-counter swaps,
to minimize earnings volatility related to natural gas, NGL and condensate price fluctuations.

We reduce our gross processing spread exposure through a
combination of physical and financial hedges. We utilize a portion of our percent-of-proceeds equity natural gas as an offset, or natural hedge, to an equivalent portion of our keep-whole shrink requirements. This has the effect of converting our
gross processing spread risk to NGL commodity price risk, and we then use financial instruments to hedge the sale of NGLs.



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The following tables set forth our Natural Gas Gathering and Processing segments hedging information for the
remainder of 2008 and for the year ending December 31, 2009.



|                                     |  |                                    |  |                  |  |                  |   |  | 
|------------------------------------ |  | ---------------------------------- |  | ---------------- |  | ---------------- | - |  | 
|                                     |  | Six Months EndingDecember 31, 2008 |  |                  | 
|                                     |  | VolumesHedged                      |  | Average Price    |  | PercentageHedged |   |  | 
|Natural gas liquids (Bbl/d)(a)       |  | 8,560                              |  | $  1.31 / gallon |  | 74               | % |  | 
|Condensate (Bbl/d)(a)                |  | 748                                |  | $  2.16 / gallon |  | 78               | % |  | 
|Total liquid sales (Bbl/d)           |  | 9,308                              |  | $  1.38 / gallon |  | 74               | % |  | 
|                                     |  |                                    |  |                 
|Natural gas (MMBtu/d)(a)             |  | 5,500                              |  | $  9.35 / MMBtu  |  | 54               | % |  | 
|(a) - Hedged with fixed-price swaps. |  |                                    |  |                  |  |                  |   |  | 
|                                     |  | Year EndingDecember 31, 2009       |  |                  | 
|                                     |  | VolumesHedged                      |  | Average Price    |  | PercentageHedged |   |  | 
|Natural gas liquids (Bbl/d)(a)       |  | 3,313                              |  | $  2.01 / gallon |  | 28               | % |  | 
|Condensate (Bbl/d)(a)                |  | 666                                |  | $  3.23 / gallon |  | 47               | % |  | 
|Total liquid sales (Bbl/d)           |  | 3,979                              |  | $  2.22 / gallon |  | 30               | % |  | 
|(a) - Hedged with fixed-price swaps. |  |                                    |  |                  |  |                  |   |  | 

Our commodity price risk is estimated as a hypothetical change in the price of NGLs, crude oil and natural gas at
June 30, 2008, excluding the effects of hedging and assuming normal operating conditions. Our condensate sales are based on the price of crude oil. We estimate the following:

| |  |  | a $0.01 per gallon increase in the composite price of NGLs would increase annual net margin by approximately $1.6 million,
| | - |  | --------------------------------------------------------------------------------------------------------------------------

| |  |  | a $1.00 per barrel increase in the price of crude oil would increase annual net margin by approximately $0.7 million, and
| | - |  | -------------------------------------------------------------------------------------------------------------------------

| |  |  | a $0.10 per MMBtu increase in the price of natural gas would increase annual net margin by approximately $0.2 million.
| | - |  | ----------------------------------------------------------------------------------------------------------------------

The above estimates of commodity price risk do not include any effects on demand for our services that might be caused by, or arise in conjunction with, price changes.
For example, a change in the gross processing spread may cause a change in the amount of ethane extracted from the natural gas stream, impacting gathering and processing margins, NGL exchange revenues, natural gas deliveries, and NGL volumes shipped
and fractionated.

See Note D of the Notes to Consolidated Financial Statements in this Quarterly Report on Form 10-Q for more information on our hedging
activities.



|ITEM 4. | CONTROLS AND PROCEDURES
|------- | -----------------------

Quarterly Evaluation of Disclosure
Controls and Procedures - As of the end of the period covered by this report, the Chief Executive Officer (Principal Executive Officer) and the Chief Financial Officer (Principal Financial Officer) of ONEOK Partners GP, our general partner,
evaluated the effectiveness of our disclosure controls and procedures as defined in Rules 13a-15(e) and 15d-15(e) of the Exchange Act. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that
information required to be disclosed by us in the reports that we file or submit under the Exchange Act is accumulated and communicated to management of ONEOK Partners GP, including the officers of ONEOK Partners GP who are the equivalent of our
principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure. Based on their evaluation, they concluded that as of June 30, 2008, our disclosure controls and procedures were
effective in ensuring that the information required to be disclosed by us in the reports we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SECs rules and forms.

Changes in Internal Control Over Financial Reporting - We have made no changes in our internal control over financial reporting (as defined in Rule
13a-15(f) and 15d-15(f) under the Exchange Act) during the second quarter ended June 30, 2008, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.



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PART II - OTHER INFORMATION



|ITEM 1. | LEGAL PROCEEDINGS
|------- | -----------------

Information about our legal proceedings is
included under Part I, Item 3, Legal Proceedings, in our Annual Report on Form 10-K for the year ended December 31, 2007.



|ITEM 1A. | RISK FACTORS
|-------- | ------------

Our investors should consider the risks set forth in
Part I, Item 1A, Risk Factors of our Annual Report on Form 10-K for the year ended December 31, 2007, that could affect us and our business. Although we have tried to discuss key factors, our investors need to be aware that other risks may
prove to be important in the future. New risks may emerge at any time and we cannot predict such risks or estimate the extent to which they may affect our financial performance. Investors should carefully consider the discussion of risks and the
other information included or incorporated by reference in this Quarterly Report on Form 10-Q, including Forward-Looking Statements, which are included in Part I, Item 2, Managements Discussion and Analysis of Financial
Condition and Results of Operations.



|ITEM 2. | UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS
|------- | -----------------------------------------------------------

Not
Applicable.



|ITEM 3. | DEFAULTS UPON SENIOR SECURITIES
|------- | -------------------------------

Not Applicable.



|ITEM 4. | SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS
|------- | ---------------------------------------------------

Not
Applicable.



|ITEM 5. | OTHER INFORMATION
|------- | -----------------

Not Applicable.



|ITEM 6. | EXHIBITS
|------- | --------

The following exhibits are filed as part of this
Quarterly Report on Form 10-Q:



|            |  |                                                                                                                                                                                      
|----------- |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibit No. |  | Exhibit Description                                                                                                                                                                  
|31.1        |  | Certification of John W. Gibson pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                                                                                           
|            | 
|31.2        |  | Certification of Curtis L. Dinan pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                                                                                          
|            | 
|32.1        |  | Certification of John W. Gibson pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished only pursuant to Rule
13a-14(b)). 
|            | 
|32.2        |  | Certification of Curtis L. Dinan pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished only pursuant to Rule
13a-14(b)).



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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.



|                     |  |                      |  |                                                |  |                                                                         
|-------------------- |  | -------------------- |  | ---------------------------------------------- |  | ------------------------------------------------------------------------
|                     |  | ONEOK PARTNERS, L.P.
|                     |  | By:                  |  | ONEOK Partners GP, L.L.C., its General Partner
|Date: August 6, 2008 |  |                      |  |                                                |  |                                                                         
|                     |  |                      |  | By:                                            |  | /s/ Curtis L. Dinan                                                     
|                     |  |                      |  |                                                |  | Curtis L. Dinan                                                         
|                     |  |                      |  |                                                |  | Executive Vice President,                                               
|                     |  |                      |  |                                                |  | Chief Financial Officer and Treasurer                                   
|                     |  |                      |  |                                                |  | (Signing on behalf of the Registrant and as Principal
Financial Officer)



39