##### Table of Contents

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549



FORM
10-Q



(Mark One)



x    QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly
period ended March 31, 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 1-1232



DUKE ENERGY OHIO, INC.

(Exact Name of Registrant as Specified in its Charter)



|                                                                               |  |                                  
|------------------------------------------------------------------------------ |  | ---------------------------------
|Ohio                                                                           |  | 31-0240030                       
|(State or Other Jurisdiction of Incorporation)                                 |  | (IRS Employer Identification No.)
|                                                                               |  |                                  
|139 East Fourth Street Cincinnati, OH (Address of Principal Executive Offices) |  | 45202 (Zip
code)                 



704-594-6200

(Registrants telephone number, including area code)



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 registrants were required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes x No  ̈



Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a
non-accelerated filer, or a smaller reporting company. See the definitions of large accelerated filer, accelerated filer and smaller reporting company in Rule 12b-2 of the Exchange Act. (Check one):

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



Indicate by check mark whether the registrant is
a shell company (as defined in Rule 12b-2 of the Securities Exchange Act of 1934).

Yes  ̈ No x



All of the registrants common stock is indirectly owned by Duke Energy Corporation (File No. 1-32853) which is a reporting company under
the Securities Exchange Act of 1934, as amended.



The registrant meets the conditions set
forth in General Instructions H(1)(a) and (b) of Form 10-Q and is therefore filing this form with the reduced disclosure format specified in General Instructions H(2) of Form 10-Q.



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##### Table of Contents

INDEX



DUKE ENERGY OHIO, INC.

FORM 10-Q FOR THE QUARTER ENDED

MARCH 31, 2008



|                              |  |                                                                                                                                              |  |     
|----------------------------- |  | -------------------------------------------------------------------------------------------------------------------------------------------- |  | ----
|Item                          |  |                                                                                                                                              |  | Page
|PART I. FINANCIAL INFORMATION |  |                                                                                                                                             
|                              |  |                                                                                                                                             
|1.                            |  | Financial Statements                                                                                                                         |  | 3   
|                              |  | Unaudited Consolidated Statements of Operations for the Three Months Ended March 31, 2008 and 2007                                           |  | 3   
|                              |  | Unaudited Consolidated Balance Sheets as of March 31, 2008 and December 31, 2007                                                             |  | 4   
|                              |  | Unaudited Consolidated Statements of Cash Flows for the Three Months Ended March 31, 2008 and 2007                                           |  | 6   
|                              |  | Unaudited Consolidated Statements of Common Stockholders Equity and Comprehensive Income for the Three Months Ended March 31, 2008 and 2007 |  | 7   
|                              |  | Unaudited Notes to the Consolidated Financial Statements                                                                                     |  | 8   
|                              |  |                                                                                                                                             
|2.                            |  | Managements Discussion and Analysis of Financial Condition and Results of Operations                                                        |  | 25  
|                              |  |                                                                                                                                             
|4.                            |  | Controls and Procedures                                                                                                                      |  | 27  
|                              | 
|PART II. OTHER INFORMATION    |  |                                                                                                                                             
|                              |  |                                                                                                                                             
|1.                            |  | Legal Proceedings                                                                                                                            |  | 28  
|                              |  |                                                                                                                                             
|1A.                           |  | Risk Factors                                                                                                                                 |  | 28  
|                              |  |                                                                                                                                             
|6.                            |  | Exhibits                                                                                                                                     |  | 29  
|                              |  |                                                                                                                                             
|                              |  | Signatures                                                                                                                                   |  | 30  



CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING
INFORMATION





This document includes forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Forward-looking statements are based on
managements beliefs and assumptions. These forward-looking statements are identified by terms and phrases such as anticipate, believe, intend, estimate, expect, continue,
should, could, may, plan, project, predict, will, potential, forecast, target, and similar expressions. Forward-looking
statements involve risks and uncertainties that may cause actual results to be materially different from the results predicted. Factors that could cause actual results to differ materially from those indicated in any forward-looking statement
include, but are not limited to:

| |  |  | State and federal legislative and regulatory initiatives, including costs of compliance with existing and future environmental requirements;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | State and federal legislative and regulatory initiatives and rulings that affect cost and investment recovery or have an impact on rate structures;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | Costs and effects of legal and administrative proceedings, settlements, investigations and claims;
| | - |  | --------------------------------------------------------------------------------------------------

| |  |  | Industrial, commercial and residential growth in Duke Energy Ohio, Inc.s (Duke Energy Ohio) service territories;
| | - |  | -----------------------------------------------------------------------------------------------------------------

| |  |  | Additional competition in electric markets and continued industry consolidation;
| | - |  | --------------------------------------------------------------------------------

| |  |  | The influence of weather and other natural phenomena on Duke Energy Ohio operations, including the economic, operational and other effects of tornados, droughts and other
natural phenomena;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | The timing and extent of changes in commodity prices and interest rates;
| | - |  | ------------------------------------------------------------------------

| |  |  | Unscheduled generation outages, unusual maintenance or repairs and electric transmission system constraints;
| | - |  | ------------------------------------------------------------------------------------------------------------

| |  |  | The performance of electric generation facilities;
| | - |  | --------------------------------------------------

| |  |  | The results of financing efforts, including Duke Energy Ohios ability to obtain financing on favorable terms, which can be affected by various factors, including Duke
Energy Ohios credit ratings and general economic conditions;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | Declines in the market prices of equity securities and resultant cash funding requirements of Duke Energy Ohio for Cinergys defined benefit pension plans;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | The level of credit worthiness of counterparties to Duke Energy Ohios transactions;
| | - |  | ------------------------------------------------------------------------------------

| |  |  | Employee workforce factors, including the potential inability to attract and retain key personnel;
| | - |  | --------------------------------------------------------------------------------------------------

| |  |  | Growth in opportunities for Duke Energy Ohios business units, including the timing and success of efforts to develop domestic power and other projects; and
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | The effect of accounting pronouncements issued periodically by accounting standard-setting bodies.
| | - |  | --------------------------------------------------------------------------------------------------

In light of these risks, uncertainties and assumptions, the events described in the forward-looking statements might not occur or might occur to a different extent
or at a different time than Duke Energy Ohio has described. Duke Energy Ohio undertakes no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.



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##### Table of Contents

PART I. FINANCIAL INFORMATION



DUKE ENERGY OHIO,
INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)

(In millions)



Item 1.Financial Statements.



|                                                       |  |                            |     |      |   |     |  
|------------------------------------------------------ |  | -------------------------- | --- | ---- | - | --- | -
|                                                       |  | Three MonthsEndedMarch 31, |    
|                                                       |  | 2008                       |     | 2007 |  
|Operating Revenues                                     |  |                            |     |      |   |     |  
|Non-regulated electric and other                       |  | $                          | 392 |      | $ | 346 |  
|Regulated electric                                     |  |                            | 242 |      |   | 231 |  
|Regulated natural gas                                  |  |                            | 357 |      |   | 339 |  
|Total operating revenues                               |  |                            | 991 |      |   | 916 |  
|Operating Expenses                                     |  |                            |     |      |   |     |  
|Fuel used in electric generation and purchased power   |  |                            | 177 |      |   | 225 |  
|Operation, maintenance and other                       |  |                            | 182 |      |   | 185 |  
|Cost of natural gas                                    |  |                            | 250 |      |   | 255 |  
|Depreciation and amortization                          |  |                            | 99  |      |   | 93  |  
|Property and other taxes                               |  |                            | 73  |      |   | 73  |  
|Total operating expenses                               |  |                            | 781 |      |   | 831 |  
|Gains (Losses) on Sales of Other Assets and Other, net |  |                            | 13  |      |   | (11 | )
|Operating Income                                       |  |                            | 223 |      |   | 74  |  
|Other Income and Expenses, net                         |  |                            | 9   |      |   | 9   |  
|Interest Expense                                       |  |                            | 26  |      |   | 23  |  
|Income Before Income Taxes                             |  |                            | 206 |      |   | 60  |  
|Income Tax Expense                                     |  |                            | 73  |      |   | 23  |  
|Net Income                                             |  | $                          | 133 |      | $ | 37  |  
|                                                       | 



See Notes to Unaudited
Consolidated Financial Statements



3



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##### Table of Contents

PART I



DUKE ENERGY OHIO, INC.

CONSOLIDATED BALANCE SHEETS

(Unaudited)

(In millions)



|                                                                                                     |  |               |        |  |  |                  |   |       
|---------------------------------------------------------------------------------------------------- |  | ------------- | ------ |  |  | ---------------- | - | ------
|                                                                                                     |  | March 31,2008 |        |  |  | December 31,2007
|ASSETS                                                                                               |  |               |        |  |  |                  |   |       
|Current Assets                                                                                       |  |               |        |  |  |                  |   |       
|Cash and cash equivalents                                                                            |  | $             | 38     |  |  |                  | $ | 33    
|Receivables (net of allowance for doubtful accounts of $3 at March 31, 2008and at December 31, 2007) |  |               | 281    |  |  |                  |   | 334   
|Inventory                                                                                            |  |               | 168    |  |  |                  |   | 212   
|Unrealized gains on mark-to-market and hedging transactions                                          |  |               | 52     |  |  |                  |   | 22    
|Other                                                                                                |  |               | 67     |  |  |                  |   | 94    
|Total current assets                                                                                 |  |               | 606    |  |  |                  |   | 695   
|Investments and Other Assets                                                                         |  |               |        |  |  |                  |   |       
|Restricted funds held in trust                                                                       |  |               | 63     |  |  |                  |   | 62    
|Goodwill                                                                                             |  |               | 2,325  |  |  |                  |   | 2,325 
|Intangibles, net                                                                                     |  |               | 529    |  |  |                  |   | 551   
|Unrealized gains on mark-to-market and hedging transactions                                          |  |               | 40     |  |  |                  |   | 17    
|Other                                                                                                |  |               | 36     |  |  |                  |   | 33    
|Total investments and other assets                                                                   |  |               | 2,993  |  |  |                  |   | 2,988 
|Property, Plant and Equipment                                                                        |  |               |        |  |  |                  |   |       
|Cost                                                                                                 |  |               | 9,671  |  |  |                  |   | 9,577 
|Less accumulated depreciation and amortization                                                       |  |               | 2,151  |  |  |                  |   | 2,097 
|Net property, plant and equipment                                                                    |  |               | 7,520  |  |  |                  |   | 7,480 
|Regulatory Assets and Deferred Debits                                                                |  |               |        |  |  |                  |   |       
|Deferred debt expense                                                                                |  |               | 23     |  |  |                  |   | 23    
|Regulatory assets related to income taxes                                                            |  |               | 93     |  |  |                  |   | 90    
|Other                                                                                                |  |               | 375    |  |  |                  |   | 401   
|Total regulatory assets and deferred debits                                                          |  |               | 491    |  |  |                  |   | 514   
|Total Assets                                                                                         |  | $             | 11,610 |  |  |                  | $ | 11,677
|                                                                                                    



See Notes to Unaudited
Consolidated Financial Statements



4



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##### Table of Contents

PART I



DUKE ENERGY OHIO, INC.

CONSOLIDATED BALANCE
SHEETS(Continued)

(Unaudited)

(In millions, except share and per-share amounts)



|                                                                            |  |               |        |   |                  |   |        |  
|--------------------------------------------------------------------------- |  | ------------- | ------ | - | ---------------- | - | ------ | -
|                                                                            |  | March 31,2008 |        |   | December 31,2007 |  
|LIABILITIES AND COMMON STOCKHOLDER'S EQUITY                                 |  |               |        |   |                  |   |        |  
|Current Liabilities                                                         |  |               |        |   |                  |   |        |  
|Accounts payable                                                            |  | $             | 458    |   |                  | $ | 602    |  
|Notes payable                                                               |  |               | 47     |   |                  |   | 189    |  
|Taxes accrued                                                               |  |               | 228    |   |                  |   | 172    |  
|Interest accrued                                                            |  |               | 28     |   |                  |   | 24     |  
|Current maturities of long-term debt                                        |  |               | 126    |   |                  |   | 126    |  
|Unrealized losses on mark-to-market and hedging transactions                |  |               | 56     |   |                  |   | 24     |  
|Other                                                                       |  |               | 86     |   |                  |   | 86     |  
|Total current liabilities                                                   |  |               | 1,029  |   |                  |   | 1,223  |  
|Long-term Debt                                                              |  |               | 1,808  |   |                  |   | 1,810  |  
|Deferred Credits and Other Liabilities                                      |  |               |        |   |                  |   |        |  
|Deferred income taxes                                                       |  |               | 1,450  |   |                  |   | 1,436  |  
|Investment tax credits                                                      |  |               | 16     |   |                  |   | 16     |  
|Accrued pension and other post-retirement benefit costs                     |  |               | 285    |   |                  |   | 259    |  
|Unrealized losses on mark-to-market and hedging transactions                |  |               | 31     |   |                  |   | 25     |  
|Asset retirement obligations                                                |  |               | 32     |   |                  |   | 31     |  
|Other                                                                       |  |               | 290    |   |                  |   | 343    |  
|Total deferred credits and other liabilities                                |  |               | 2,104  |   |                  |   | 2,110  |  
|Commitments and Contingencies                                               |  |               |        |   |                  |   |        |  
|                                                                            |  |              
|Common Stockholders Equity                                                 |  |               |        |   |                  |   |        |  
|Common stock, $8.50 par value; 120,000,000 shares authorized and 89,663,086 |  |               |        |   |                  |   |        |  
|shares outstanding at March 31, 2008 and December 31, 2007                  |  |               | 762    |   |                  |   | 762    |  
|Additional paid-in capital                                                  |  |               | 5,570  |   |                  |   | 5,570  |  
|Retained earnings                                                           |  |               | 360    |   |                  |   | 227    |  
|Accumulated other comprehensive loss                                        |  |               | (23    | ) |                  |   | (25    | )
|Total common stockholders equity                                           |  |               | 6,669  |   |                  |   | 6,534  |  
|Total Liabilities and Common Stockholders Equity                           |  | $             | 11,610 |   |                  | $ | 11,677 |  
|                                                                            | 



See Notes to Unaudited
Consolidated Financial Statements



5



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##### Table of Contents

PART I



DUKE ENERGY OHIO, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

(In millions)



|                                                                                  |  |                             |      |   |      |   |      |  
|--------------------------------------------------------------------------------- |  | --------------------------- | ---- | - | ---- | - | ---- | -
|                                                                                  |  | Three Months EndedMarch 31, |     
|                                                                                  |  | 2008                        |      |   | 2007 |  
|CASH FLOWS FROM OPERATING ACTIVITIES                                              |  |                             |      |   |      |   |      |  
|Net income                                                                        |  | $                           | 133  |   |      | $ | 37   |  
|Adjustments to reconcile net income to net cash provided by operating activities: |  |                             |      |   |      |   |      |  
|Depreciation and amortization                                                     |  |                             | 100  |   |      |   | 93   |  
|(Gains) losses on sales of other assets and other, net                            |  |                             | (13  | ) |      |   | 11   |  
|Deferred income taxes                                                             |  |                             | 8    |   |      |   | (20  | )
|Regulatory asset/liability amortization                                           |  |                             | 7    |   |      |   | 8    |  
|Accrued pension and other post-retirement benefit costs                           |  |                             | 6    |   |      |   | 15   |  
|(Increase) decrease in:                                                           |  |                             |      |   |      |   |      |  
|Net realized and unrealized mark-to-market and hedging transactions               |  |                             | (38  | ) |      |   | 25   |  
|Receivables                                                                       |  |                             | 52   |   |      |   | 67   |  
|Inventory                                                                         |  |                             | 59   |   |      |   | 64   |  
|Other current assets                                                              |  |                             | 32   |   |      |   | (14  | )
|Increase (decrease) in:                                                           |  |                             |      |   |      |   |      |  
|Accounts payable                                                                  |  |                             | (132 | ) |      |   | 149  |  
|Taxes accrued                                                                     |  |                             | 49   |   |      |   | (124 | )
|Other current liabilities                                                         |  |                             | 3    |   |      |   | (11  | )
|Regulatory asset/liability deferrals                                              |  |                             | 7    |   |      |   | (4   | )
|Other assets                                                                      |  |                             | 17   |   |      |   | 40   |  
|Other liabilities                                                                 |  |                             | (24  | ) |      |   | (3   | )
|Net cash provided by operating activities                                         |  |                             | 266  |   |      |   | 333  |  
|CASH FLOWS FROM INVESTING ACTIVITIES                                              |  |                             |      |   |      |   |      |  
|Capital expenditures                                                              |  |                             | (133 | ) |      |   | (147 | )
|Purchases of emission allowances                                                  |  |                             |     |   |      |   | (14  | )
|Sales of emission allowances                                                      |  |                             | 12   |   |      |   | 22   |  
|Net proceeds from the sales of other assets                                       |  |                             | 4    |   |      |   |     |  
|Change in restricted funds held in trust                                          |  |                             |     |   |      |   | 11   |  
|Net cash used in investing activities                                             |  |                             | (117 | ) |      |   | (128 | )
|CASH FLOWS FROM FINANCING ACTIVITIES                                              |  |                             |      |   |      |   |      |  
|Redemption of long-term debt                                                      |  |                             | (2   | ) |      |   | (2   | )
|Notes payable to affiliate, net                                                   |  |                             | (142 | ) |      |   | (227 | )
|Net cash used in financing activities                                             |  |                             | (144 | ) |      |   | (229 | )
|Net increase (decrease) in cash and cash equivalents                              |  |                             | 5    |   |      |   | (24  | )
|Cash and cash equivalents at beginning of period                                  |  |                             | 33   |   |      |   | 45   |  
|Cash and cash equivalents at end of period                                        |  | $                           | 38   |   |      | $ | 21   |  
|                                                                                  | 
|Supplemental Disclosures                                                          |  |                             |      |   |      |   |      |  
|Significant non-cash transactions:                                                |  |                             |      |   |      |   |      |  
|Purchase accounting adjustments                                                   |  | $                           |     |   |      | $ | 4    |  
|Accrued capital expenditures                                                      |  | $                           | 39   |   |      | $ | 22   |  



See Notes to Unaudited
Consolidated Financial Statements



6



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##### Table of Contents

PART I



DUKE ENERGY OHIO, INC.

CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY AND COMPREHENSIVE INCOME

(Unaudited)

(In millions)



|                                                      |  |             |     |                          |   |                  |  |   |                                              |   |  |                        |     |   |       |   |    |   |  |   |       |  
|----------------------------------------------------- |  | ----------- | --- | ------------------------ | - | ---------------- |  | - | -------------------------------------------- | - |  | ---------------------- | --- | - | ----- | - | -- | - |  | - | ----- | -
|                                                      |  |             |     |                          |   |                  |  |   | Accumulated Other ComprehensiveIncome (Loss) |   |  |                        |    
|                                                      |  | CommonStock |     | AdditionalPaid-inCapital |   | RetainedEarnings |  |   | Net Gains(Losses) onCash FlowHedges          |   |  | SFAS No. 158Adjustment |     |   | Total |  
|Balance at December 31, 2006                          |  | $           | 762 |                          | $ | 5,601            |  | $ | 55                                           |   |  | $                      | (36 | ) |       | $ | (2 | ) |  | $ | 6,380 |  
|Net income                                            |  |             |    |                          |   |                 |  |   | 37                                           |   |  |                        |    |   |       |   |   |   |  |   | 37    |  
|Other comprehensive income, net of tax effect of ($2) |  |             |     |                          |   |                  |  |   |                                              |   |  |                        |     |   |       |   |    |   |  |   |       |  
|Cash flow hedges                                      |  |             |    |                          |   |                 |  |   |                                             |   |  |                        | 4   |   |       |   |   |   |  |   | 4     |  
|                                                      |  |             |     |                          |   |                  |  |   |                                              |   |  |                        |     |   |       |   |    |   |  |   |       |  
|Total comprehensive income                            |  |             |     |                          |   |                  |  |   |                                              |   |  |                        |     |   |       |   |    |   |  |   | 41    |  
|Push-down accounting adjustments                      |  |             |    |                          |   | 4                |  |   |                                             |   |  |                        |    |   |       |   |   |   |  |   | 4     |  
|Adoption of SFAS No. 158measurement date provision   |  |             |    |                          |   |                 |  |   | (4                                           | ) |  |                        |    |   |       |   |   |   |  |   | (4    | )
|Balance at March 31, 2007                             |  | $           | 762 |                          | $ | 5,605            |  | $ | 88                                           |   |  | $                      | (32 | ) |       | $ | (2 | ) |  | $ | 6,421 |  
|                                                      |  |             |     |                          |   |                  |  |   |                                              |   |  |                        |     |   |       |   |    |   |  |   |       |  
|Balance at December 31, 2007                          |  | $           | 762 |                          | $ | 5,570            |  | $ | 227                                          |   |  | $                      | (32 | ) |       | $ | 7  |   |  | $ | 6,534 |  
|Net income                                            |  |             |    |                          |   |                 |  |   | 133                                          |   |  |                        |    |   |       |   |   |   |  |   | 133   |  
|Other comprehensive income, net of tax effect of ($1) |  |             |     |                          |   |                  |  |   |                                              |   |  |                        |     |   |       |   |    |   |  |   |       |  
|Cash flow hedges                                      |  |             |    |                          |   |                 |  |   |                                             |   |  |                        | 2   |   |       |   |   |   |  |   | 2     |  
|                                                      |  |             |     |                          |   |                  |  |   |                                              |   |  |                        |     |   |       |   |    |   |  |   |       |  
|Total comprehensive income                            |  |             |     |                          |   |                  |  |   |                                              |   |  |                        |     |   |       |   |    |   |  |   | 135   |  
|                                                      |  |             |     |                          |   |                  |  |   |                                              |   |  |                        |     |   |       |   |    |   |  |   |       |  
|Balance at March 31, 2008                             |  | $           | 762 |                          | $ | 5,570            |  | $ | 360                                          |   |  | $                      | (30 | ) |       | $ | 7  |   |  | $ | 6,669 |  



See Notes to Unaudited
Consolidated Financial Statements



7



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##### Table of Contents

PART I



DUKE ENERGY OHIO, INC.

Notes To Unaudited Consolidated Financial Statements



1.
Basis of Presentation

Nature of Operations and Basis of Consolidation. Duke Energy Ohio, Inc. (Duke Energy Ohio), an Ohio corporation
organized in 1837, is a wholly-owned subsidiary of Cinergy Corp. (Cinergy). Cinergy is a wholly-owned subsidiary of Duke Energy Corporation (Duke Energy). Duke Energy Ohio is a combination electric and gas public utility company that provides
service in the southwestern portion of Ohio and through Duke Energy Kentucky, Inc. (Duke Energy Kentucky) in nearby areas of Kentucky. Duke Energy Ohios principal lines of business include generation, transmission and distribution of
electricity, the sale of and/or transportation of natural gas, and energy marketing. Duke Energy Ohios principal subsidiary is Duke Energy Kentucky, a Kentucky corporation organized in 1901. Duke Energy Kentuckys principal lines of
business include generation, transmission and distribution of electricity as well as the sale of and/or transportation of natural gas. References herein to Duke Energy Ohio includes Duke Energy Ohio and its subsidiaries.

These Consolidated Financial Statements include, after eliminating intercompany transactions and balances, the accounts of Duke Energy Ohio and all majority-owned
subsidiaries where Duke Energy Ohio has control. These Consolidated Financial Statements also reflect Duke Energy Ohios proportionate share of certain generation and transmission facilities in Ohio and Kentucky.

These Consolidated Financial Statements have been prepared in accordance with generally accepted accounting principles (GAAP) in the United States of America (U.S.)
for interim financial information and with the instructions to Form 10-Q and Regulation S-X. Accordingly, these Consolidated Financial Statements do not include all of the information and footnotes required by GAAP for annual financial statements.
Because the interim Consolidated Financial Statements and Notes do not include all of the information and footnotes required by GAAP for annual financial statements, the Consolidated Financial Statements and other information included in this
quarterly report should be read in conjunction with the Consolidated Financial Statements and Notes in Duke Energy Ohios Form 10-K for the year ended December 31, 2007.

These Consolidated Financial Statements reflect all normal recurring adjustments that are, in the opinion of management, necessary to fairly present Duke Energy
Ohios financial position and results of operations. Amounts reported in the interim Consolidated Statements of Operations are not necessarily indicative of amounts expected for the respective annual periods due to the effects of seasonal
temperature variations on energy consumption, regulatory rulings, the timing of maintenance on electric generating units, changes in mark-to-market valuations, changing commodity prices, and other factors.

Use of Estimates. To conform to GAAP in the U.S., management makes estimates and assumptions that affect the amounts reported in the Consolidated Financial
Statements and Notes. Although these estimates are based on managements best available knowledge at the time, actual results could differ.

Reclassifications. Certain prior period amounts on the Consolidated Balance Sheets have been reclassified in connection with the adoption of Financial Accounting Standards Board (FASB) Staff Position (FSP) No. FIN 39-1,
Amendment of FASB Interpretation No. 39, Offsetting of Amounts Related to Certain Contracts, (FSP No. FIN 39-1) on January 1, 2008, as discussed below, the effects of which require retrospective application to the
Consolidated Balance Sheets.

Netting of cash collateral and derivative assets and liabilities under master netting arrangements.On
January 1, 2008, Duke Energy Ohio adopted FSP No. FIN 39-1. In accordance with FSP No. FIN 39-1, Duke Energy Ohio offsets fair value amounts (or amounts that approximate fair value) recognized on its Consolidated Balance Sheets related to
cash collateral amounts receivable or payable against fair value amounts recognized for derivative instruments executed with the same counterparty under the same master netting agreement. Prior to the adoption of FSP No. FIN 39-1, Duke Energy Ohio
offset the fair value amounts recognized for derivative instruments executed with the same counterparty under the same master netting agreement in accordance with FIN 39, Offsetting of Amounts Related to Certain Contracts, but
presented cash collateral on a gross basis within the Consolidated Balance Sheets. At March 31, 2008 and December 31, 2007, Duke Energy Ohio had receivables related to the right to reclaim cash collateral of approximately $16 million and
$5 million, respectively, and had payables related to obligations to return cash collateral of approximately $34 million and an immaterial amount, respectively, that have been offset against net derivative positions in the Consolidated Balance
Sheets. Duke Energy Ohio had immaterial cash collateral receivables under master netting arrangements that have not been offset against net derivative positions at March 31, 2008 and December 31, 2007, respectively. Duke Energy Ohio
had an immaterial amount of cash collateral payables under master netting arrangements that have not been offset against net derivative positions at March 31, 2008 and December 31, 2007.

Unbilled Revenue. Revenues on sales of electricity and gas are recognized when either the service is provided or the product is delivered. Unbilled revenues
are estimated by applying an average revenue per kilowatt hour or per thousand cubic feet (Mcf) for all cus-



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##### Table of Contents

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DUKE ENERGY OHIO, INC.

Notes To Unaudited Consolidated Financial Statements(Continued)



tomer classes to the number of estimated kilowatt hours or Mcfs delivered but not billed. The amount of unbilled revenues can vary significantly period to period
as a result of factors including seasonality, weather, customer usage patterns and customer mix. Receivables for unbilled revenues of $121 million and $145 million at March 31, 2008 and December 31, 2007, respectively are included in the
sales of accounts receivable to Cinergy Receivables Company, LLC (Cinergy Receivables), an unconsolidated entity formed by Cinergy.

Other
Regulatory Assets and Deferred Debits. The state of Ohio passed comprehensive electric deregulation legislation in 1999, and in 2000, the Public Utilities Commission of Ohio (PUCO) approved a stipulation agreement relating to Duke Energy
Ohios transition plan creating a Regulatory Transition Charge (RTC) designed to recover Duke Energy Ohios generation-related regulatory assets and transition costs over a ten-year period beginning January 1, 2001 and ending December
2010. Accordingly, application of Statement of Financial Accounting Standards (SFAS) No. 71, Accounting for Certain Types of Regulation, (SFAS No. 71) was discontinued for the generation portion of Duke Energy
Ohios business. Duke Energy Ohio has a RTC related regulatory asset balance of approximately $215 million and $239 million as of March 31, 2008 and December 31, 2007, respectively, which is classified in Other Regulatory Assets and
Deferred Debits on the Consolidated Balance Sheets.



2. Business Segments

Duke Energy Ohio operates the following business units: Franchised Electric and Gas and Commercial Power. Duke Energy Ohios chief
operating decision maker regularly reviews financial information about each of these business units in deciding how to allocate resources and evaluate performance. Both of the business units are considered reportable segments under SFAS
No. 131, Disclosures about Segments of an Enterprise and Related Information. There is no aggregation within Duke Energy Ohios defined business segments.

Franchised Electric and Gas generates, transmits, distributes and sells electricity in southwestern Ohio and northern Kentucky. Franchised Electric and Gas also
transports and sells natural gas in southwestern Ohio and northern Kentucky. It conducts operations primarily through Duke Energy Ohio and Duke Energy Kentucky.

Commercial Power owns, operates and manages non-regulated power plants and engages in the wholesale marketing and procurement of electric power, fuel and emission allowances related to these plants as well as other contractual
positions. Commercial Powers generation asset fleet consists of Duke Energy Ohios non-regulated generation in Ohio and the five Midwestern gas-fired non-regulated generation assets. Commercial Powers assets comprise approximately
7,600 megawatts of power generation primarily located in the Midwestern U.S. The asset portfolio has a diversified fuel mix with baseload and mid-merit coal-fired units as well as combined cycle and peaking natural gas-fired units. Most of the
generation asset output in Ohio has been contracted through the rate stabilization plan (RSP).

The remainder of Duke Energy Ohios operations
are presented as Other. While it is not considered a business segment, Other primarily includes certain allocated governance costs (see Note 8).

Duke
Energy Ohios reportable segments offer different products and services and are managed separately as business units. Accounting policies for Duke Energy Ohios segments are the same as those described in the Notes to the Consolidated
Financial Statements in Duke Energy Ohios Annual Report on Form 10-K for the year ended December 31, 2007. Management evaluates segment performance based on earnings before interest and taxes from continuing operations (EBIT).

On a segment basis, EBIT excludes discontinued operations and represents all profits from continuing operations (both operating and non-operating and excluding
corporate governance costs) before deducting interest and taxes. Cash, cash equivalents, and investments in marketable securities, if any, are managed centrally by Duke Energy, so the interest and dividend income on those balances are excluded from
the segments EBIT.

Transactions between reportable segments are accounted for on the same basis as unaffiliated revenues and expenses in the
accompanying Consolidated Financial Statements.



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Notes To Unaudited Consolidated Financial Statements(Continued)



Business Segment Data



|                                  |  |                         |     |                                                                              |   |     |                             |  |   |   
|--------------------------------- |  | ----------------------- | --- | ---------------------------------------------------------------------------- | - | --- | --------------------------- |  | - | --
|                                  |  | UnaffiliatedRevenues(a) |     | Segment EBIT/Consolidated Incomefrom ContinuingOperations BeforeIncome Taxes |   |     | DepreciationandAmortization
|                                  |  | (in millions)          
|Three Months Ended March 31, 2008 |  |                         |     |                                                                              |   |     |                             |  |   |   
|Franchised Electric and Gas       |  | $                       | 599 |                                                                              | $ | 97  |                             |  | $ | 58
|Commercial Power                  |  |                         | 392 |                                                                              |   | 145 |                             |  |   | 41
|Total reportable segments         |  |                         | 991 |                                                                              |   | 242 |                             |  |   | 99
|Other                             |  |                         |    |                                                                              |   | (18 | )                           |  |   |  
|Interest expense                  |  |                         |    |                                                                              |   | (26 | )                           |  |   |  
|Interest income and other         |  |                         |    |                                                                              |   | 8   |                             |  |   |  
|Total consolidated                |  | $                       | 991 |                                                                              | $ | 206 |                             |  | $ | 99
|                                 
|Three months Ended March 31, 2007 |  |                         |     |                                                                              |   |     |                             |  |   |   
|Franchised Electric and Gas       |  | $                       | 570 |                                                                              | $ | 79  |                             |  | $ | 53
|Commercial Power                  |  |                         | 346 |                                                                              |   | 13  |                             |  |   | 40
|Total reportable segments         |  |                         | 916 |                                                                              |   | 92  |                             |  |   | 93
|Other                             |  |                         |    |                                                                              |   | (18 | )                           |  |   |  
|Interest expense                  |  |                         |    |                                                                              |   | (23 | )                           |  |   |  
|Interest income and other         |  |                         |    |                                                                              |   | 9   |                             |  |   |  
|Total consolidated                |  | $                       | 916 |                                                                              | $ | 60  |                             |  | $ | 93
|                                 



|(a) | There were no intersegment revenues for the three months ended March 31, 2008 and 2007.
|--- | ---------------------------------------------------------------------------------------



Segment Assets



|                                              |  |               |        |                  |   |       
|--------------------------------------------- |  | ------------- | ------ | ---------------- | - | ------
|                                              |  | March 31,2008 |        | December 31,2007
|                                              |  | (in millions)
|Franchised Electric and Gas                   |  | $             | 5,469  |                  | $ | 5,530 
|Commercial Power                              |  |               | 6,141  |                  |   | 6,147 
|                                              |  |               |        |                  |   |       
|Total reportable segments/consolidated assets |  | $             | 11,610 |                  | $ | 11,677
|                                              |  |               |        |                  |   |       



3. Dispositions

For the three months ended March 31, 2008 and 2007, the sale of emission allowances resulted in approximately $12 million and $22 million, respectively,
in proceeds and net pre-tax gains (losses) of $12 million and $(11) million, respectively, recorded in Gains (losses) on Sales of Other Assets and Other, net on the Consolidated Statements of Operations. These amounts primarily relate to Commercial
Powers sales of emission allowances.



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DUKE ENERGY OHIO, INC.

Notes To Unaudited Consolidated Financial Statements(Continued)



4. Inventory

Inventory consists primarily
of coal held for electric generation; materials and supplies; and natural gas held in storage for transmission and sales commitments. Inventory is recorded primarily using the average cost method.



|                                    |  |               |     |                  |   |    
|----------------------------------- |  | ------------- | --- | ---------------- | - | ---
|                                    |  | March 31,2008 |     | December 31,2007
|                                    |  | (in millions)
|Gas held in storage                 |  | $             | 22  |                  | $ | 69 
|Fuel for use in electric generation |  |               | 77  |                  |   | 77 
|Materials and supplies              |  |               | 69  |                  |   | 66 
|                                    |  |               |     |                  |   |    
|Total Inventory                     |  | $             | 168 |                  | $ | 212
|                                    |  |               |     |                  |   |    



5. Debt and Credit Facilities

Duke Energy Ohio receives support for its short-term borrowing needs through its participation with Duke Energy and other Duke Energy subsidiaries in a money
pool arrangement, which allows Duke Energy Ohio to better manage its cash and working capital requirements. Under this arrangement, those companies with short-term funds may provide short-term loans to affiliates participating under this
arrangement. As of March 31, 2008 and December 31, 2007, Duke Energy Ohio was in a payable position of $47 million and $189 million, respectively, classified within Notes payable in the accompanying Consolidated Balance Sheets. During the
three months ended March 31, 2008 and 2007, the $142 million and $227 million change in the money pool, respectively, is reflected as a cash outflow in Notes payable to affiliate, net within Net cash used in financing activities on the
Consolidated Statements of Cash Flows.

Available Credit Facilities and Restrictive Debt Covenants. In March 2008, Duke Energy entered into an
amendment to its $2.65 billion master credit facility whereby the borrowing capacity was increased by $550 million to $3.2 billion. Pursuant to the amendment, the additional credit capacity of $550 million specifically increased the borrowing sub
limit for Duke Energy Ohio (excluding Duke Energy Kentucky) by $250 million to $750 million. The borrowing sub limit of Duke Energy Kentucky did not change. In May 2008, Duke Energy reallocated the borrowing sub limits under the master credit
facility and reduced Duke Energy Ohios borrowing sub limit by $50 million to $700 million.

The issuance of commercial paper, letters of credit
and other borrowings reduces the amount available under the credit facility.

Duke Energys credit agreement contains various financial and other
covenants, including, but not limited to, a covenant regarding the debt-to-total capitalization ratio at Duke Energy, Duke Energy Ohio and Duke Energy Kentucky to not exceed 65%. Duke Energy Ohios debt agreements also contain various financial
and other covenants. Failure to meet these covenants beyond applicable grace periods could result in accelerated due dates and/or termination of the agreements. As of March 31, 2008, Duke Energy and Duke Energy Ohio were in compliance with
those covenants. In addition, some credit agreements may allow for acceleration of payments or termination of the agreements due to nonpayment, or the acceleration of other significant indebtedness of the borrower or some of its subsidiaries. None
of the debt or credit agreements contain material adverse change clauses.

As of March 31, 2008 and December 31, 2007, approximately $96
million of certain pollution control bonds, which are short-term obligations by nature, are classified as Long-term Debt on the Consolidated Balance Sheets due to Duke Energy Ohios intent and ability to utilize such borrowings as long-term
financing. Duke Energys credit facilities with non-cancelable terms in excess of one year as of the balance sheet date give Duke Energy Ohio the ability to refinance these short-term obligations on a long-term basis.



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Notes To Unaudited Consolidated Financial Statements(Continued)



6. Employee Benefit Obligations

Duke Energy
Ohio participates in pension and other post-retirement benefit plans sponsored by Cinergy. Duke Energy Ohios net periodic benefit costs as allocated by Cinergy were as follows:



|                                  |  |                                |   |                                |   |  
|--------------------------------- |  | ------------------------------ | - | ------------------------------ | - | -
|                                  |  | Three MonthsEndedMarch 31,2008 |   | Three MonthsEndedMarch 31,2007
|                                  |  | (in millions)                 
|Qualified Pension Benefits(a)     |  | $                              | 2 |                                | $ | 8
|Other Post-retirement Benefits(b) |  | $                              | 3 |                                | $ | 3



|(a) | These amounts exclude approximately $1 million and $3 million for the three months ended March 31, 2008 and 2007, respectively, of regulatory asset amortization resulting from purchase
accounting.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(b) | The three months ended March 31, 2007 excludes approximately $1 million of regulatory asset amortization resulting from purchase accounting.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------

Duke Energys policy is to fund amounts for its U.S. qualified pension plans on an actuarial basis to provide assets sufficient to meet benefit payments to be
paid to plan participants. Duke Energy did not make contributions to the legacy Cinergy qualified or non-qualified pension plans during the three months ended March 31, 2008 or 2007. Duke Energy does not anticipate making contributions to the
legacy Cinergy qualified or non-qualified pension plans during 2008. Duke Energy also sponsors employee savings plans that cover substantially all U.S. employees. Duke Energy Ohio expensed pre-tax employer matching contributions of approximately $1
million for each of the three months ended March 31, 2008 and 2007.



7. Goodwill
and Intangibles

The following table shows goodwill by business segment at March 31, 2008 and December 31, 2007:



Carrying Amount of Goodwill



|                            |  |                            |       |         |   |                         |  |   |      
|--------------------------- |  | -------------------------- | ----- | ------- | - | ----------------------- |  | - | -----
|                            |  | Balance atDecember 31,2007 |       | Changes |   | Balance atMarch 31,2008
|                            |  | (in millions)             
|Business Segment:           |  |                            |       |         |   |                         |  |   |      
|Commercial Power            |  | $                          | 1,188 |         | $ |                        |  | $ | 1,188
|Franchised Electric and Gas |  |                            | 1,137 |         |   |                        |  |   | 1,137
|                            |  |                            |       |         |   |                         |  |   |      
|Total Goodwill              |  | $                          | 2,325 |         | $ |                        |  | $ | 2,325
|                            |  |                            |       |         |   |                         |  |   |      



The carrying amount and
accumulated amortization of intangible assets as of March 31, 2008 and December 31, 2007 are as follows:



|                                                        |  |               |      |   |                  |   |     |  
|------------------------------------------------------- |  | ------------- | ---- | - | ---------------- | - | --- | -
|                                                        |  | March 31,2008 |      |   | December 31,2007 |  
|                                                        |  | (in millions) |     
|Emission allowances                                     |  | $             | 349  |   |                  | $ | 365 |  
|Gas, coal, and power contracts                          |  |               | 271  |   |                  |   | 271 |  
|Other                                                   |  |               | 9    |   |                  |   | 9   |  
|                                                        |  |               |      |   |                  |   |     |  
|Total gross carrying amount                             |  |               | 629  |   |                  |   | 645 |  
|                                                        |  |               |      |   |                  |   |     |  
|Accumulated amortizationgas, coal, and power contracts |  |               | (95  | ) |                  |   | (89 | )
|Accumulated amortizationother                          |  |               | (5   | ) |                  |   | (5  | )
|                                                        |  |               |      |   |                  |   |     |  
|Total accumulated amortization                          |  |               | (100 | ) |                  |   | (94 | )
|                                                        |  |               |      |   |                  |   |     |  
|Total intangible assets, net                            |  | $             | 529  |   |                  | $ | 551 |  
|                                                        |  |               |      |   |                  |   |     |  



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Notes To Unaudited Consolidated Financial Statements(Continued)



Emission allowances in the table above include emission allowances, which as part of the Duke Energy and Cinergy merger, were recorded
at fair value on the date of the merger and emission allowances purchased by Duke Energy Ohio. Additionally, Duke Energy Ohio is allocated certain zero cost emission allowances on an annual basis. Carrying value of emission allowances sold or
consumed during the three months ended March 31, 2008 and 2007 were $16 million and $67 million, respectively. See Note 3 for discussion of gains and losses on sales of emission allowances at Commercial Power during the three months ended
March 31, 2008 and 2007.

Amortization expense for gas, coal and power contracts and other intangible assets for the three months ended
March 31, 2008 and 2007 was approximately $6 million and $12 million, respectively.

In connection with the Duke Energy and Cinergy merger, Duke
Energy Ohio recorded an intangible liability of approximately $113 million associated with the market based standard service offer (MBSSO) in Ohio, which is being recognized in earnings over the remaining regulatory period that ends on
December 31, 2008. During the three months ended March 31, 2008 and 2007, Duke Energy Ohio amortized approximately $17 million and less than $1 million, respectively, to income related to this intangible liability. The carrying amount of
this intangible liability was approximately $50 million and $67 million at March 31, 2008 and December 31, 2007, respectively. Duke Energy Ohio also recorded approximately $56 million of intangible liabilities associated with other power
sale contracts in connection with the merger. The carrying amount of this intangible liability was approximately $21 million and $22 million at March 31, 2008 and December 31, 2007, respectively. During the three months ended
March 31, 2008 and 2007, Duke Energy Ohio amortized approximately $1 million and $4 million, respectively, to income related to these power sale contracts.



8. Related Party Transactions

Duke Energy Ohio engages in related
party transactions. These transactions are generally performed at cost and in accordance with the applicable state and federal commission regulations. Balances due to or due from related parties included in the Consolidated Balance Sheets as of
March 31, 2008 and December 31, 2007 are as follows:



|                                                       |  |               |        |   |                  |   |        |  
|------------------------------------------------------ |  | ------------- | ------ | - | ---------------- | - | ------ | -
|                                                       |  | March 31,2008 |        |   | December 31,2007 |  
|                                                       |  | (in millions) |       
|Current assets due from affiliated companies(a)(b)     |  | $             | 49     |   |                  | $ | 58     |  
|Current liabilities due to affiliated companies(a)(c)  |  | $             | (221   | ) |                  | $ | (266   | )
|Non-current liabilities due to affiliated companies(d) |  | $             | (4     | ) |                  | $ |       |  
|Net deferred tax liabilities to Duke Energy(a)(e)      |  | $             | (1,416 | ) |                  | $ | (1,401 | )



|(a) | Balances exclude assets or liabilities associated with accrued pension and other post-retirement benefits, Cinergy Receivables and money pool arrangements as discussed below.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(b) | Of the balance at March 31, 2008, approximately ($38) million is classified as Receivables and ($11) million is classified as Other Current Assets. The balance at December 31, 2007
is classified as Receivables on the Consolidated Balance Sheets.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(c) | Of the balance at March 31, 2008, approximately ($159) million is classified as Accounts payable and ($62) million is classified as Taxes accrued on the Consolidated Balance Sheets. Of
the balance at December 31, 2007, approximately ($256) million is classified as Accounts payable and ($10) million is classified as Taxes accrued on the Consolidated Balance Sheets.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(d) | The balance at March 31, 2008 is classified as Unrealized losses on mark-to-market and hedging transactions within Deferred Credits and Other Liabilities on the Consolidated Balance Sheets.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(e) | Of the balance at March 31, 2008, approximately ($1,423) million is classified as Deferred income taxes, ($16) million is classified as Investment tax credits and $23 million is
classified as Other within Current Assets on the Consolidated Balance Sheets. Of the balance at December 31, 2007, approximately ($1,409) million is classified as Deferred income taxes, ($16) million is classified as Investment tax credits and
$24 million is classified as Other within Current Assets on the Consolidated Balance Sheets.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



Duke Energy Ohio is allocated its proportionate share of corporate governance and other costs by a consolidated affiliate of Duke Energy and a consolidated
affiliate of Cinergy. Corporate governance and other shared services costs are primarily allocations of corporate costs, such as human resources, legal and accounting fees, as well as other third party costs. The expenses associated with certain
allocated corporate governance and other service costs for Duke Energy Ohio, which are recorded in Operation, maintenance and other within Operating Expenses on the Consolidated Statements of Operations were $61 million and $56 million for the three
months ended March 31, 2008 and 2007, respectively.



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See Note 6 for detail on expense amounts allocated from Cinergy to Duke Energy Ohio related to Duke Energy Ohios participation
in Cinergys qualified and non-qualified defined benefit pension plans and post-retirement health care and insurance benefits. Additionally, Duke Energy Ohio has been allocated accrued pension and other post-retirement benefit obligations from
Cinergy of approximately $293 million at March 31, 2008 and approximately $266 million at December 31, 2007. These amounts have been classified in the Consolidated Balance Sheets as follows:



|                                                        |  |               |     |                  |   |    
|------------------------------------------------------- |  | ------------- | --- | ---------------- | - | ---
|                                                        |  | March 31,2008 |     | December 31,2007
|                                                        |  | (in millions)
|Other current liabilities                               |  | $             | 5   |                  | $ | 5  
|Accrued pension and other post-retirement benefit costs |  | $             | 285 |                  | $ | 259
|Other deferred credits and other liabilities            |  | $             | 3   |                  | $ | 2  



Additionally, certain trade
receivables have been sold by Duke Energy Ohio to Cinergy Receivables, an unconsolidated entity formed by Cinergy. The proceeds obtained from the sales of receivables are largely cash but do include a subordinated note from Cinergy Receivables for a
portion of the purchase price. This subordinated note is classified by Duke Energy Ohio as Receivables in the Consolidated Balance Sheets and was approximately $175 million and $189 million as of March 31, 2008 and December 31, 2007,
respectively. The interest income associated with Cinergy Receivables for Duke Energy Ohio, which is recorded in Other Income and Expenses, net on the Consolidated Statements of Operations, was approximately $8 million for the three months ended
March 31, 2008 and 2007.

Duke Energy Ohio participates in a money pool with Duke Energy and other Duke Energy subsidiaries. As of March 31,
2008 and December 31, 2007, Duke Energy Ohio was in a payable position of $47 million and $189 million, respectively, classified within Notes payable in the accompanying Consolidated Balance Sheets. The expenses associated with money pool
activity for Duke Energy Ohio, which are recorded in Interest Expense on the Consolidated Statements of Operations for the three months ended March 31, 2008 and 2007 were $1 million and $2 million, respectively. See Note 5 for further
discussion of the money pool arrangement.



9. Risk Management Instruments

As discussed in Note 1, on January 1, 2008, Duke Energy Ohio adopted FSP No. FIN 39-1. In accordance with FSP No. FIN 39-1, Duke Energy
Ohio offsets fair value amounts (or amounts that approximate fair value) recognized on its Consolidated Balance Sheets related to cash collateral amounts receivable or payable against fair value amounts recognized for derivative instruments executed
with the same counterparty under the same master netting agreement. Amounts presented in the table below exclude cash collateral amounts which are disclosed separately in Note 1.

The following table shows the carrying value of Duke Energy Ohios derivative portfolio as of March 31, 2008, and December 31, 2007.



Net Derivative Portfolio Assets (Liabilities) reflected in the Consolidated Balance Sheets: (in
millions)



|             |  |               |     |   |                  |   |     |  
|------------ |  | ------------- | --- | - | ---------------- | - | --- | -
|             |  | March 31,2008 |     |   | December 31,2007 |  
|Hedging      |  | $             | (23 | ) |                  | $ | (23 | )
|Undesignated |  |               | 46  |   |                  |   | 7   |  
|             |  |               |     |   |                  |   |     |  
|Total        |  | $             | 23  |   |                  | $ | (16 | )
|             |  |               |     |   |                  |   |     |  



The amounts in the table above
represent the combination of assets and (liabilities) for unrealized gains and losses on mark-to-market and hedging transactions on Duke Energy Ohios Consolidated Balance Sheets.

The $39 million increase in the undesignated derivative portfolio fair value is due primarily to unrealized mark-to-market gains within Commercial Power, primarily
as a result of increasing coal prices.



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Notes To Unaudited Consolidated Financial Statements(Continued)



Commodity Cash Flow Hedges.As of March 31, 2008, approximately $38 million of the pre-tax unrealized net losses on
derivative instruments related to commodity cash flow hedges included on the Consolidated Balance Sheet in Accumulated Other Comprehensive Loss (AOCI) are expected to be recognized in earnings during the next 12 months as the hedged transactions
occur. However, due to the volatility of the commodities markets, the corresponding values in AOCI will likely change prior to its reclassification into earnings.

No gains or losses due to hedge ineffectiveness were recorded during the three months ended March 31, 2008 or 2007. The amount recognized for transactions that no longer qualified as cash flow hedges was not material for
either the three months ended March 31, 2008 or March 31, 2007.

See Note 12 for additional information related to the fair value of Duke
Energy Ohios derivative instruments.



10. Regulatory Matters

Regulatory Merger Approvals. On April 3, 2006, the merger between Duke Energy and Cinergy was consummated to create a newly formed
company, Duke Energy Holding Corp. (subsequently renamed Duke Energy Corporation). As a condition to the merger approval, the PUCO, and the Kentucky Public Service Commission (KPSC) required that certain merger related savings be shared with
consumers in Ohio and Kentucky, respectively. The commissions also required Duke Energy Ohio and Duke Energy Kentucky to meet additional conditions. Key elements of these conditions include:

| |  |  | The PUCO required that Duke Energy Ohio provide (i) a rate reduction of approximately $15 million for one year to facilitate economic development in a time of increasing
rates and market prices and (ii) a reduction of approximately $21 million to its gas and electric consumers in Ohio for one year, with both credits beginning January 1, 2006. During the first quarter of 2007, Duke Energy Ohio completed its
merger related rate reductions and filed a report with the PUCO to terminate the merger credit riders. Approximately $2 million of the rate reductions was passed through to customers during the three months ended March 31, 2007.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | The KPSC required that Duke Energy Kentucky provide $8 million in rate reductions to its customers over five years, ending when new rates are established in the next rate
case after January 1, 2008. Approximately $1 million of the rate reduction was passed through to customers during each of the three months ended March 31, 2008 and 2007.
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | The FERC approved the merger without conditions.
| | - |  | ------------------------------------------------



Franchised Electric and Gas. Rate Related Information. The KPSC approves rates for retail electric and gas services within the Commonwealth of
Kentucky. The PUCO approves rates and market prices for retail gas and electric service within the state of Ohio, except that non-regulated sellers of gas and electric generation also are allowed to operate in Ohio (see Commercial Power
below). The FERC approves rates for electric sales to wholesale customers served under cost-based rates.

Duke Energy Ohio Electric Rate
Filings. Duke Energy Ohio operates under a RSP, a MBSSO approved by the PUCO in November 2004. In March 2005, the Office of the Ohio Consumers Council (OCC) appealed the PUCOs approval of the MBSSO to the Supreme Court of Ohio and
the Court issued its decision in November 2006. It upheld the MBSSO in virtually every respect but remanded to the PUCO on two issues. The Court ordered the PUCO to support a certain portion of its order with reasoning and record evidence and to
require Duke Energy Ohio to disclose certain confidential commercial agreements with other parties previously requested by the OCC. Duke Energy Ohio has complied with the disclosure order.

In October 2007, the PUCO issued its ruling affirming the MBSSO, with certain modifications, and maintaining the current price. The ruling provides for continuation
of the existing rate components, including the recovery of costs related to new pollution control equipment and capacity costs associated with power purchase contracts to meet customer demand, but provided customers an enhanced opportunity to avoid
certain pricing components if they are served by a competitive supplier. The ruling also attempted to modify the statutory requirement that Duke Energy Ohio transfer its generating assets to an exempt wholesale generator (EWG) and ordered Duke
Energy Ohio to retain ownership for the remainder of the RSP period. The ruling also incorrectly implied that Duke Energy Ohios nonresidential RTC will terminate at the end of 2008. On November 23, 2007, Duke Energy Ohio filed an
application for rehearing on the portions of the PUCOs ruling relating to whether certain pricing components may be avoided by customers, the right to transfer generating assets, and the termination date of the RTC. On December 19, 2007,
the PUCO issued its Entry on Rehearing granting in part and denying in part Duke Energy Ohios Application for Rehearing. Among other things, the PUCO modified and clarified the applicability of various rate riders during customer shopping
situations. It also clarified that the residential RTC terminates at the end of 2008 and that



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the nonresidential RTC terminates at the end of 2010 and agreed to give further consideration to whether Duke Energy Ohio may transfer its generating assets to an EWG.

On February 15, 2008, Duke Energy Ohio filed a notice of appeal with the Ohio Supreme Court challenging a portion of the PUCOs decision on
remand regarding Duke Energy Ohios RSP. The October 2007 order permits non-residential customers to avoid certain charges associated with the costs of Duke Energy Ohio standing ready to serve such customers if they return after being served by
another supplier. Duke Energy Ohio believes the PUCO exceeded its authority in modifying the charges that may be avoided, resulting in Duke Energy Ohio having to subsidize Ohios competitive electric market. Duke Energy Ohio has asked the
Supreme Court to reverse the PUCO ruling and require that non-residential customers pay the charges associated with Duke Energy Ohio standing ready to serve them should they return from a competitive supplier. On March 28, 2008, Duke
Energy Ohio voluntarily withdrew its appeal. The OCC filed a notice of appeal challenging the PUCOs October 2007 decision as unlawful and unreasonable. The OCC and Ohio Partners for Affordable Energy (OPAE) also filed appeals from the
PUCOs November 20, 2007 order approving Duke Energy Ohios MBSSO riders. Duke Energy Ohio has intervened in each appeal. Pending the Ohio Supreme Courts consideration of its initial appeal, the OCC has requested that the PUCO
stay implementation of the Infrastructure Maintenance Fund charge to be collected from customers approved in the October 2007 order. On April 14, 2008, Duke Energy Ohio filed a motion to intervene in OCCs appeal and on April 30,
2008, the Ohio Supreme Court granted such motion to intervene. At this time, Duke Energy Ohio cannot predict whether the Ohio Supreme Court will reverse the PUCOs decision or whether the PUCO will grant the OCCs request for a stay.
Additionally, Duke Energy Ohio cannot predict the outcome of the MBSSO rider appeal; however, Duke Energy Ohio does not anticipate the resolution of this matter will have a material impact on its results of operations, cash flows or financial
position.

In August 2006, Duke Energy Ohio filed an application with the PUCO to amend its MBSSO through 2010. The proposal provides for
continued electric system reliability, a simplified market price structure and clear price signals for customers, while helping to maintain a stable revenue stream for Duke Energy Ohio. On November 30, 2007, due to new legislation pending in
the Ohio General Assembly regarding the pricing of competitive retail generation services, Duke Energy Ohio requested PUCO approval, which the PUCO granted, to withdraw the Duke Energy Ohio application to amend its MBSSO. New legislation (SB 221)
was passed on April 23, 2008 and signed by the Governor of Ohio on May 1, 2008. The new law codifies the PUCOs authority to approve an electric utilitys standard service offer through an electric security plan (ESP), which
would allow for pricing structures similar to the current MBSSO. Electric utilities are required to file an ESP and may also file an application for a market rate option at the same time. The market rate option is a price determined through a
competitive bidding process. If a market rate option price is approved, the utility would blend in the MBSSO or ESP price with the market rate option price over a two- to ten-year period, subject to the PUCOs discretion. SB 221 provides for
the PUCO to approve non-by-passable charges for new generation, including construction work-in-process (CWIP) from the outset of construction, as part of an ESP. The new law grants the PUCO discretion to approve single issue rate adjustments to
distribution and transmission rates and establishes new alternative energy resources portfolio standards, such that the utilitys portfolio must consist of at least 25% of these resources by 2025. SB 221 also provides a separate requirement for
energy efficiency, which must reduce 22% of the utilitys load by 2025. The utilitys earnings under the ESP are subject to an annual earnings test and the PUCO must order a refund if it finds that the utilitys earnings significantly
exceed the earnings of benchmark companies with similar business and financial risks. The earnings test acts as a cap to the ESP price. SB 221 also limits the ability of a utility to transfer its dedicated generating assets to an EWG absent PUCO
approval. Duke Energy Ohio plans to file a new generation pricing formula before the MBSSO expires.

Duke Energy Ohio is currently preparing an ESP
filing under SB 221. This filing will address pricing for generation service beginning January 1, 2009, when the current RSP is scheduled to expire. The plan will also provide for pricing for the advanced energy, renewables and energy efficiency
portfolio standards that Duke Energy Ohio is required to meet under SB 221. Duke Energy Ohio expects to make the filing on or shortly after the effective date of the new legislation. At this time, Duke Energy Ohio cannot predict the outcome of this
proceeding.

Duke Energy Ohio Gas Rate Case. In July 2007, Duke Energy Ohio filed an application with the PUCO for an increase in its base
rates for gas service. Duke Energy Ohio sought an increase of approximately $34 million in revenue, or approximately 5.7%, to be effective in the spring of 2008. The application also requests approval to continue tracker recovery of costs associated
with an accelerated gas main replacement program. The PUCO accepted the application for filing in September 2007. The staff of the PUCO issued a Staff Report in December 2007 recommending an increase of approximately $14 million to $20 million in
revenue. The Staff Report also recommended approval for Duke Energy Ohio to continue tracker recovery of costs associated with an accelerated gas main replacement program. On February 28, 2008, Duke Energy Ohio reached a settlement agreement
with the PUCO Staff and all of the intervening parties on its



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request for an increase in natural gas base rates. The settlement calls for an annual revenue increase of approximately $18 million in base revenue, or 3 percent over
current revenue, and permits continued recovery of costs through 2018 for Duke Energy Ohios accelerated gas main replacement program and permits recovery of carrying costs on gas stored underground via its monthly gas cost adjustment filing.
The settlement is subject to the review and approval of the PUCO. An order is expected in the second quarter of 2008.

Duke Energy Kentucky Gas
Rate Cases. In 2002, the KPSC approved Duke Energy Kentuckys gas base rate case which included, among other things, recovery of costs associated with an accelerated gas main replacement program. The approval authorized a tracking mechanism
to recover certain costs including depreciation and a rate of return on the programs capital expenditures. The Kentucky Attorney General appealed to the Franklin Circuit Court the KPSCs approval of the tracking mechanism as well as the
KPSCs subsequent approval of annual rate adjustments under this tracking mechanism. In 2005, both Duke Energy Kentucky and the KPSC requested that the court dismiss these cases.

In February 2005, Duke Energy Kentucky filed a gas base rate case with the KPSC requesting approval to continue the tracking mechanism and for a $14 million annual
increase in base rates. A portion of the increase is attributable to recovery of the current cost of the accelerated gas main replacement program in base rates. In December 2005, the KPSC approved an annual rate increase of $8 million and
re-approved the tracking mechanism through 2011. In February 2006, the Kentucky Attorney General appealed the KPSCs order to the Franklin Circuit Court, claiming that the order improperly allows Duke Energy Kentucky to increase its rates for
gas main replacement costs in between general rate cases, and also claiming that the order improperly allows Duke Energy Kentucky to earn a return on investment for the costs recovered under the tracking mechanism which permits Duke Energy Kentucky
to recover its gas main replacement costs.

In August 2007, the Franklin Circuit Court consolidated all the pending appeals and ruled that the KPSC
lacks legal authority to approve the gas main replacement tracking mechanism, and any other annual rate adjustments under the tracking mechanism. To date, Duke Energy Kentucky has collected approximately $9 million in annual rate adjustments under
the tracking mechanism. Duke Energy Kentucky and the KPSC have appealed these cases to the Kentucky Court of Appeals and Duke Energy Kentucky continues to utilize tracking mechanisms in its billed rates to customers. At this time, Duke Energy
Kentucky cannot predict the outcome of these proceedings.

Energy Efficiency.On July 11, 2007, the PUCO approved Duke Energy Ohios
Demand Side Management/ Energy Efficiency Program (DSM Program). The DSM Program consists of ten residential and two commercial programs. Implementation of the programs has begun. The programs were first proposed in 2006 and were endorsed by the
Duke Energy Community Partnership, which is a collaborative group made up of representatives of organizations interested in energy conservation, efficiency and assistance to low-income customers. The programs costs will be recouped through a cost
recovery mechanism that will be adjusted annually to reflect the previous years activity. Duke Energy Ohio is permitted to recover lost revenues, program costs and shared savings (once the programs reach 65% of the targeted savings level)
through the cost recovery mechanism based upon impact studies to be provided to the Staff of the PUCO.

On November 15, 2007, Duke Energy
Kentucky filed its annual application to continue existing energy efficiency programs, consisting of nine residential and two commercial and industrial programs, and to true-up its gas and electric tracking mechanism for recovery of lost revenues,
program costs and shared savings. On February 11, 2008, Duke Energy Kentucky filed a motion to amend its energy efficiency programs and applied to reinstitute a low income Home Energy Assistance Program. An order on both applications is
expected in the second quarter of 2008.

Other. In April 2005, the PUCO issued an order opening a statewide investigation into riser leaks in
gas pipeline systems throughout Ohio. The investigation followed four explosions since 2000 caused by gas riser leaks, including an April 2000 explosion in Duke Energy Ohios service area. In November 2006, the PUCO Staff released an expert
report, which concluded that certain types of risers are prone to leaks under various conditions, including over-tightening during initial installation. The PUCO Staff recommended that natural gas companies continue to monitor the situation and
study the cause of any further riser leaks to determine whether further remedial action is warranted. Duke Energy Ohio has approximately 87,000 of these risers on its distribution system. If the PUCO orders natural gas companies to replace all of
these risers, Duke Energy Ohio estimates a replacement cost of approximately $40 million. As part of the rate case filed in July 2007 (see Duke Energy Ohio Gas Rate Case above), Duke Energy Ohio requested approval from the PUCO to
accelerate its riser replacement program. The riser replacement program is contained in the settlement reached with all interveners and will be completed at the end of 2012.



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In December 2005, the PUCO initiated an investigation into implementing certain provisions of the Energy Policy Act of 2005, including
whether to adopt a statewide standard for implementing smart metering. After an investigation, the PUCO issued a March 2007 order requiring all electric utilities to offer tariffs to all customer classes which are differentiated, at a minimum, based
on on-peak and off-peak wholesale price periods. The PUCO noted that time-of-use meters should be available for customers subscribing to these tariffs. The order instructed PUCO Staff to conduct workshop meetings to study the costs/benefits of
deploying smart metering. These workshop meetings are in progress. At this time, Duke Energy Ohio cannot predict the outcome of this proceeding.

FERC 203 Application. On April 23, 2008, Duke Energy Ohio and certain affiliates filed an application with the FERC requesting approval to transfer Duke Energy Ohios electric generating facilities, some of which are designated
to serve Ohio customers, to affiliate companies. The transaction may also entail the transfer of certain liabilities and debt. The affiliate companies would be consolidated by Duke Energy, but may not be consolidated by Duke Energy Ohio. The FERC
filing does not obligate Duke Energy to make the transfer of the electric generating facilities, and management is in the process of evaluating the potential transfer. Management believes the proposed asset transfer could provide greater financial
flexibility for the assets. The asset transfer complies with Duke Energy Ohios Corporate Separation Plan that was amended by the PUCO in 2007. The PUCO has requested that FERC not rule on the matter until after January 1, 2009. As
previously discussed, SB 221 limits the ability of a utility to transfer its designated generating assets to an EWG absent PUCO approval. The filing does not impact Duke Energy Ohios current rates.

Midwest Independent Transmission System Operator, Inc. (Midwest ISO) Resource Adequacy Filing. On December 28, 2007, the Midwest ISO filed its Electric
Tariff Filing Regarding Resource Adequacy in compliance with the FERCs request that Midwest ISO file Phase II of its long-term Resource Adequacy plan by December 2007. The proposal establishes a resource adequacy requirement in the form
of planning reserve margin. On March 26, 2008, the FERC ruled on the Midwest ISOs Resource Adequacy filing and ordered that the new tariff be effective March 27, 2008. This action established a Midwest ISO-wide resource adequacy requirement
for the first Planning Year. In the Order, the FERC clarified that States have the authority to set their own planning reserve margins, as long as they are consistent with any FERC-approved reliability standard. The FERC also rejected the use of
power purchase agreements or sellers choice contracts as capacity resources if the contracts do not specify resources. Duke Energy Ohio does not believe the Midwest ISO resource adequacy requirement will have a material impact on its
consolidated results of operations, cash flows, or financial position.

Midwest ISOs Establishment of an Ancillary Services Market. On
February 25, 2008, the FERC conditionally accepted the Midwest ISO proposal to implement a day-ahead and real-time ancillary services market (ASM), including a scarcity pricing proposal. The FERCs conditional approval is based upon cost
benefits verification. By approving the ASM proposal, the FERC essentially approved the transfer to, and consolidation of, balancing authority responsibility in the Midwest ISO so that it will become the North American Electric Reliability
Council-certified Balancing Authority for the entire Midwest ISO area. This transfer will allow the Midwest ISO to determine operating reserve requirements and procure operating reserves from all qualified resources from an organized market, in
place of the current system of local management and procurement of reserves by the 24 balancing authorities. On March 21, 2008, Midwest ISO informed the FERC that it was delaying the ASM launch date until September 9, 2008. At this time, Duke Energy
Ohio does not believe the establishment of the Midwest Ancillary Services Market will have a material impact on its consolidated results of operations, cash flows, or financial position.

Commercial Power. Reported results for Commercial Power are subject to volatility due to the over- or under-collection of certain costs, including fuel
and purchased power, since Commercial Power is not subject to regulatory accounting pursuant to SFAS No. 71. In addition, Commercial Power could be impacted by certain of the regulatory matters discussed above, including the Duke Energy
Ohio electric rate filings.



11. Commitments and Contingencies



Environmental

Duke Energy Ohio is subject to federal, state and local regulations regarding air and water quality, hazardous and solid waste disposal and other environmental matters. These regulations can be changed from time to time,
imposing new obligations on Duke Energy Ohio.

Remediation activities.Duke Energy Ohio and its affiliates are responsible for environmental
remediation at various contaminated sites. These include some properties that are part of ongoing Duke Energy Ohio operations, sites formerly owned or used by Duke



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Energy Ohio entities, and sites owned by third parties. Remediation typically involves management of contaminated soils and may involve groundwater remediation.
Managed in conjunction with relevant federal, state and local agencies, activities vary with site conditions and locations, remedial requirements, complexity and sharing of responsibility. If remediation activities involve statutory joint and
several liability provisions, strict liability, or cost recovery or contribution actions, Duke Energy Ohio or its affiliates could potentially be held responsible for contamination caused by other parties. In some instances, Duke Energy Ohio may
share liability associated with contamination with other potentially responsible parties, and may also benefit from insurance policies or contractual indemnities that cover some or all cleanup costs. All of these sites generally are managed in the
normal course of business or affiliate operations. Duke Energy Ohio believes that completion or resolution of these matters will have no material adverse effect on its consolidated results of operations, cash flows or financial position.

Clean Water Act 316(b). The U.S. Environmental Protection Agency (EPA) finalized its cooling water intake structures rule in July 2004. The rule
established aquatic protection requirements for existing facilities that withdraw 50 million gallons or more of water per day from rivers, streams, lakes, reservoirs, estuaries, oceans, or other U.S. waters for cooling purposes. Three of six
coal-fired generating facilities in which Duke Energy Ohio is either a whole or partial owner are affected sources under that rule. On January 25, 2007, the U.S. Court of Appeals for the Second Circuit issued its opinion in Riverkeeper, Inc.
v. EPA, Nos. 04-6692-ag(L) et. al. (2d Cir. 2007) remanding most aspects of the EPAs rule back to the agency. The court effectively disallowed those portions of the rule most favorable to industry, and the decision creates a great deal of
uncertainty regarding future requirements and their timing. Duke Energy Ohio is still unable to estimate costs to comply with the EPAs rule, although it is expected that costs will increase as a result of the courts decision. The
magnitude of any such increase cannot be estimated at this time. On April 14, 2008, the U.S. Supreme Court issued an order granting review of the case. A decision is not likely until 2009 after briefs are submitted and oral argument occurs.

Clean Air Interstate Rule (CAIR). The EPA finalized its CAIR in May 2005. The CAIR
limits total annual and summertime nitrogen oxides (NOx) emissions and annual sulfur dioxide (SO2) emissions from electric generating facilities across the Eastern U.S. through a two-phased cap-and-trade program. Phase 1 begins
in 2009 for NOx and in 2010 for SO2. Phase 2 begins in 2015 for both NOx and SO2. Duke Energy Ohio currently estimates that it will spend approximately $150 million between 2008 and 2012 to comply with
Phase 1 of CAIR at plants that Duke Energy Ohio owns or partially owns but does not operate. Duke Energy Ohio currently estimates that it will not incur any significant costs for complying with Phase 2 of CAIR. Duke Energy Ohio receives partial
recovery of depreciation and financing costs related to environmental compliance projects for 2005-2008 through its RSP (see Note 10).

On March 25, 2008, the U.S. Court of Appeals for the District of Columbia heard oral arguments in a case
involving multiple challenges to the CAIR. Nearly all aspects of the rule were challenged, but Duke Energy challenged only the portions pertaining to SO2 allowance allocations. A decision is expected in the summer of 2008. The outcome and
any resulting consequences cannot be estimated at this time.

Clean Air Mercury Rule (CAMR). The EPA finalized its CAMR in May 2005. The CAMR
was to have limited total annual mercury emissions from coal-fired power plants across the U.S. through a two-phased cap-and-trade program beginning in 2010. On February 8, 2008 the U.S. Court of Appeals for the District of Columbia issued its
opinion in New Jersey v. EPA, No. 05-1097, vacating the CAMR. The decision creates uncertainty regarding future mercury emission reduction requirements and their timing. The EPA and utilities have requested rehearing of the D.C. Circuit
Court decision by the entire D.C. Circuit panel (en banc review). The court has ordered briefing on whether it should accept the case for en banc review. Thus, the matter remains unsettled until the court decides whether to rehear the case. Barring
reversal of the decision if reheard, there will be a delay in the implementation of federal mercury requirements for existing coal-fired power plants while the EPA conducts a new rulemaking. Duke Energy Ohio is unable to estimate the costs to comply
with a new EPA rule, although it is expected that costs will increase as a result of the courts decision.

Coal Combustion Product (CCP)
Management. Duke Energy Ohio currently estimates that it will spend approximately $95 million over the period 2008-2012 to install synthetic caps and liners at existing and new CCP landfills and to convert CCP handling systems from wet to dry
systems.

Extended Environmental Activities and Accruals. Included in Other within Deferred Credits and Other Liabilities on the Consolidated
Balance Sheets were total accruals related to extended environmental-related activities of approximately $8 million as of March 31, 2008 and December 31, 2007, respectively. These accruals represent Duke Energy Ohios provisions for
costs associated with remediation



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activities at some of its current and former sites, as well as other relevant environmental contingent liabilities. Duke Energy Ohio believes that completion or
resolution of these matters will have no material impact on its consolidated results of operations, cash flows or financial position.



Litigation

New
Source Review (NSR). In 1999-2000, the U.S. Department of Justice acting on behalf of the EPA, filed a number of complaints and notices of violation against multiple utilities across the country for alleged violations of the NSR provisions of
the Clean Air Act (CAA). Generally, the government alleges that projects performed at various coal-fired units were major modifications, as defined in the CAA, and that the utilities violated the CAA when they undertook those projects without
obtaining permits and installing the best available emission controls for SO2, NOx and particulate matter. The complaints seek injunctive relief to require installation of pollution control technology on various allegedly
violating generating units, and unspecified civil penalties in amounts of up to $27,500 per day for each violation. Two of Duke Energy Ohios plants have been subject to these allegations. Duke Energy Ohio asserts that there were no CAA
violations because the applicable regulations do not require permitting in cases where the projects undertaken are routine or otherwise do not result in a net increase in emissions.

In November 1999, the U.S. brought a lawsuit in the U.S. Federal District Court for the Southern District of Indiana against Duke Energy Ohio alleging various
violations of the CAA at Duke Energy Ohios Beckjord and Miami Fort Stations. The lawsuit alleges that Duke Energy Ohio violated the CAA by not obtaining Prevention of Significant Deterioration, Non-Attainment New Source Review and Ohios
State Implementation Plan (SIP) permits. Additionally, the suit claims that Duke Energy Ohio violated an Administrative Consent Order entered into in 1998 between the EPA and Cinergy relating to alleged violations of Ohios SIP provisions
governing particulate matter at Duke Energy Ohios Beckjord Station. Three northeast states and two environmental groups have intervened in the case. In June 2007, the trial court ruled, as a matter of law, that certain of the projects do not
qualify for the routine exception in the regulations. The court ruled further that the defendants had fair notice of the EPAs interpretation of the applicable regulations. Duke Energy Ohio is arguing at trial that all
of the projects were not reasonably expected to cause an increase in annual emissions and that certain of the projects are also exempt from the statute because they were routine. A jury trial commenced on May 5, 2008.

Duke Energy Ohio has been informed by Dayton Power and Light (DP&L) that in June 2000, the EPA issued a Notice of Violation (NOV) to DP&L for alleged
violations of CAA requirements at a station operated by DP&L and jointly-owned by DP&L, Columbus Southern Power Company (CSP), and Duke Energy Ohio. The NOV indicated the EPA may issue an order requiring compliance with the requirements of
the Ohio SIP, or bring a civil action seeking injunctive relief and civil penalties of up to $27,500 per day for each violation. In September 2004, Marilyn Wall and the Sierra Club brought a lawsuit against Duke Energy Ohio, DP&L and CSP for
alleged violations of the CAA at this same generating station. On December 14, 2007, the Court ordered a stay of the litigation pending settlement negotiations among the parties. That stay is set to expire on May 15, 2008. Trial is
currently scheduled to commence in August 2008.

It is not possible to predict with certainty whether Duke Energy Ohio will incur any liability or to
estimate the damages, if any, that Duke Energy Ohio might incur in connection with these matters. Ultimate resolution of these matters, even in settlement, could have a material adverse effect on Duke Energy Ohios consolidated results of
operations, cash flows or financial position. However, Duke Energy Ohio will pursue appropriate regulatory treatment for any costs incurred in connection with such resolution.

Section 126 Petitions. In March 2004, the state of North Carolina filed a petition under Section 126 of the CAA in which it alleges that sources in
13 upwind states, including Ohio, significantly contribute to North Carolinas non-attainment with certain ambient air quality standards. In August 2005, the EPA issued a proposed response to the petition. The EPA proposed to deny the ozone
portion of the petition based upon a lack of contribution to air quality by the named states. The EPA also proposed to deny the particulate matter portion of the petition based upon the CAIR Federal Implementation Plan (FIP), that would address the
air quality concerns from neighboring states. On April 28, 2006, the EPA denied North Carolinas petition based upon the final CAIR FIP described above. North Carolina has filed a legal challenge to the EPAs denial.

Carbon Dioxide (CO2) Litigation. In July 2004, the states of Connecticut, New York,
California, Iowa, New Jersey, Rhode Island, Vermont, Wisconsin and the City of New York brought a lawsuit in the U.S. District Court for the Southern District of New York against Cinergy, American Electric Power Company, Inc., American Electric
Power Service Corporation, The Southern Company, Tennessee Valley Authority, and Xcel Energy Inc. A similar lawsuit was filed in the U.S. District Court for the Southern District of New York against the same companies by Open Space Institute, Inc.,
Open Space Conservancy, Inc., and The Audubon Society of New Hampshire. These



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lawsuits allege that the defendants emissions of CO2 from the combustion of fossil fuels at electric generating facilities contribute to global
warming and amount to a public nuisance. The complaints also allege that the defendants could generate the same amount of electricity while emitting significantly less CO2. The plaintiffs are seeking an injunction requiring each defendant
to cap its CO2emissions and then reduce them by a specified percentage each year for at least a decade. In September 2005, the District Court granted the defendants motion to dismiss the lawsuit. The plaintiffs have appealed this
ruling to the Second Circuit Court of Appeals. Oral arguments were held before the Second Circuit Court of Appeals on June 7, 2006. It is not possible to predict with certainty whether Duke Energy Ohio will incur any liability or to estimate
the damages, if any, that Duke Energy Ohio might incur in connection with this matter.

Zimmer Generating Station (Zimmer Station) Lawsuit. In
November 2004, a citizen of the Village of Moscow, Ohio, the town adjacent to Duke Energy Ohios Zimmer Station, brought a purported class action in the U.S. District Court for the Southern District of Ohio seeking monetary damages and
injunctive relief against Duke Energy Ohio for alleged violations of the CAA, the Ohio SIP, and Ohio laws against nuisance and common law nuisance. The plaintiffs have filed a number of additional notices of intent to sue and two lawsuits
raising claims similar to those in the original claim. One lawsuit was dismissed on procedural grounds, and the remaining two have been consolidated. On December 28, 2006, the District Court certified this case as a class action. Discovery in
the case continues. At this time, Duke Energy Ohio cannot predict whether the outcome of this matter will have a material impact on its consolidated financial position, cash flows or results of operations. Duke Energy Ohio intends to defend this
lawsuit vigorously in court.

Hurricane Katrina Lawsuit. In April 2006, Cinergy was named in the third amended complaint of a purported class
action lawsuit filed in the U.S. District Court for the Southern District of Mississippi. Plaintiffs claim that Cinergy, along with numerous other utilities, oil companies, coal companies and chemical companies, are liable for damages relating to
losses suffered by victims of Hurricane Katrina. Plaintiffs claim that defendants greenhouse gas emissions contributed to the frequency and intensity of storms such as Hurricane Katrina. In October 2006, Cinergy was served with this lawsuit.
On August 30, 2007, the court dismissed the case. The plaintiffs have filed their appeal to the Fifth Circuit Court of Appeals. Briefing is ongoing in the Fifth Circuit. It is not possible to predict with certainty whether Duke Energy Ohio will
incur any liability or to estimate the damages, if any, that Duke Energy Ohio might incur in connection with this matter.

Ohio Antitrust
Lawsuit. In January 2008, four plaintiffs, including individual, industrial and non-profit customers, filed a lawsuit against Duke Energy Ohio in federal court in the Southern District of Ohio. Plaintiffs allege that Duke Energy Ohio (then The
Cincinnati Gas & Electric Company (CG&E)), conspired to provide inequitable and unfair price advantages for certain large business consumers by entering into non-public option agreements with such consumers in exchange for their
withdrawal of challenges to Duke Energy Ohios (then CG&Es) pending RSP, which was implemented in early 2005. Duke Energy Ohio strongly denies the allegations made in the lawsuit and on March 21, 2008, Duke Energy Ohio filed a
motion to dismiss plaintiffs claims. It is not possible to predict with certainty whether Duke Energy Ohio will incur any liability or to estimate the damages, if any, that Duke Energy Ohio might incur in connection with this matter.

Asbestos-related Injuries and Damages Claims. Duke Energy Ohio has been named as a defendant or co-defendant in lawsuits related to asbestos
at its electric generating stations. The impact on Duke Energy Ohios consolidated results of operations, cash flows, or financial position of these cases to date has not been material. Based on estimates under varying assumptions concerning
uncertainties, such as, among others: (i) the number of contractors potentially exposed to asbestos during construction or maintenance of Duke Energy Ohios generating plants; (ii) the possible incidence of various illnesses among
exposed workers, and (iii) the potential settlement costs without federal or other legislation that addresses asbestos tort actions, Duke Energy Ohio estimates that the range of reasonably possible exposure in existing and future suits over the
foreseeable future is not material. This estimated range of exposure may change as additional settlements occur and claims are made and more case law is established.

Other Litigation and Legal Proceedings. Duke Energy Ohio and its subsidiaries are involved in other legal, tax and regulatory proceedings arising in the ordinary course of business, some of which involve substantial
amounts. Duke Energy Ohio believes that the final disposition of these proceedings will not have a material adverse effect on its consolidated results of operations, cash flows or financial position.

Duke Energy Ohio has exposure to certain legal matters that are described herein. As of March 31, 2008 and December 31, 2007, Duke Energy Ohio has
recorded immaterial reserves for these proceedings and exposures. Duke Energy Ohio expenses legal costs related to the defense of loss contingencies as incurred.



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Other Commitments and Contingencies

On March 10, 2008, the EPA issued a Clean Air Act Notice of Violation/Finding of Violation (NOV/FOV)
asserting noncompliance with SO2 emission limits, opacity standards, and permitting requirements at Duke Energy Ohios Zimmer Generating Station. The NOV/FOV also asserts that a PSD permit should have been obtained for the
installation in 2004 of a pollution control project in order to comply with the EPAs regional cap-and-trade program for NOx emissions. Duke Energy Ohio disputes the legal and factual basis for the FOV/NOV. Duke Energy Ohio is unable
to predict at this time what, if any, remedies or potential penalties may result from the FOV/NOV.

Other. Duke Energy Ohio enters into various
fixed-price, non-cancelable commitments to purchase or sell power (tolling arrangements or power purchase contracts) that may or may not be recognized on the Consolidated Balance Sheets.



12. Fair Value of Financial Assets and Liabilities

On January 1, 2008, Duke Energy Ohio adopted SFAS No. 157, Fair Value Measurements (SFAS No. 157). Duke Energy Ohios adoption of SFAS No. 157 is currently limited to financial instruments and to
non-financial derivatives as, in February 2008, the FASB issued FSP No. 157-2, which delayed the effective date of SFAS No. 157 for one year for nonfinancial assets and liabilities, except for items that are recognized or disclosed at
fair value in the financial statements on a recurring basis. There was no cumulative effect adjustment to retained earnings for Duke Energy Ohio as a result of the adoption of SFAS No. 157.

SFAS No. 157 defines fair value, establishes a framework for measuring fair value in GAAP and expands disclosure requirements about fair value measurements.
Under SFAS No. 157, fair value is considered to be the exchange price in an orderly transaction between market participants to sell an asset or transfer a liability at the measurement date. The fair value definition under SFAS No. 157
focuses on an exit price, which is the price that would be received by Duke Energy Ohio to sell an asset or paid to transfer a liability versus an entry price, which would be the price paid to acquire an asset or received to assume a liability.
Although SFAS No. 157 does not require additional fair value measurements, it applies to other accounting pronouncements that require or permit fair value measurements.

Duke Energy Ohio determines fair value of financial assets and liabilities based on the following fair value hierarchy, as prescribed by SFAS No. 157, which
prioritizes the inputs to valuation techniques used to measure fair value into three levels:

Level 1 inputs  unadjusted quoted prices in
active markets for identical assets or liabilities that Duke Energy Ohio has the ability to access. An active market for the asset or liability is one in which transactions for the asset or liability occur with sufficient frequency and volume to
provide ongoing pricing information. Duke Energy Ohio does not adjust quoted market prices on Level 1 inputs for any blockage factor.

Level 2
inputs inputs other than quoted market prices included in Level 1 that are observable, either directly or indirectly, for the asset or liability. Level 2 inputs include, but are not limited to, quoted prices for similar assets or
liabilities in an active market, quoted prices for identical or similar assets or liabilities in markets that are not active and inputs other than quoted market prices that are observable for the asset or liability, such as interest rate curves and
yield curves observable at commonly quoted intervals, volatilities, credit risk and default rates.

Level 3 inputs  unobservable inputs
for the asset or liability.

In February 2007, the FASB issued SFAS No. 159, The Fair Value Option for Financial Assets and Financial
Liabilities-including an amendment of FASB Statement No. 115 (SFAS No. 159), which permits entities to elect to measure many financial instruments and certain other items at fair value. For Duke Energy Ohio, SFAS No. 159 was
effective as of January 1, 2008 and had no impact on amounts presented for periods prior to the effective date. Duke Energy Ohio does not currently have any financial assets or financial liabilities for which the provisions of SFAS No. 159
have been elected. However, in the future, Duke Energy Ohio may elect to measure certain financial instruments at fair value in accordance with this standard.



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##### Table of Contents

PART I

DUKE ENERGY OHIO, INC.

Notes To Unaudited Consolidated Financial Statements(Continued)



The following table provides the fair value measurement amounts for assets and liabilities recorded on Duke Energy Ohios
Consolidated Balance Sheets at fair value at March 31, 2008:



|                       |  |                                          |     |         |   |         |  |         |   |  |   |    
|---------------------- |  | ---------------------------------------- | --- | ------- | - | ------- |  | ------- | - |  | - | ---
|                       |  | Total Fair ValueAmounts atMarch 31, 2008 |     | Level 1 |   | Level 2 |  | Level 3
|                       |  | (in millions)                           
|Description            |  |                                          |     |         |   |         |  |         |   |  |   |    
|Derivative assets      |  | $                                        | 126 |         | $ | 51      |  | $       |  |  | $ | 75 
|Derivative liabilities |  | $                                        | 103 |         | $ |        |  | $       | 3 |  | $ | 100



The following table provides a
reconciliation of beginning and ending balances of assets measured at fair value on a recurring basis where the determination of fair value includes significant unobservable inputs (Level 3):



Rollforward of Level 3 Measurements

|                                                                                                                                     |  |                   |     |  
|------------------------------------------------------------------------------------------------------------------------------------ |  | ----------------- | --- | -
|                                                                                                                                     |  | Derivatives (net) |    
|                                                                                                                                     |  | (in millions)     |    
|Balance at January 1, 2008                                                                                                           |  | $                 | (22 | )
|Total pre-tax realized or unrealized gains included in earnings:                                                                     |  |                   |     |  
|Revenue, non-regulated                                                                                                               |  |                   | 8   |  
|Total pre-tax losses included in other comprehensive income                                                                          |  |                   | (3  | )
|Net purchases, sales, issuances and settlements                                                                                      |  |                   | (8  | )
|                                                                                                                                     |  |                   |     |  
|Balance at March 31, 2008                                                                                                            |  | $                 | (25 | )
|                                                                                                                                     |  |                   |     |  
|Pre-tax amounts included in the Consolidated Statements of Operations related to Level 3 measurements outstanding at March 31,
2008: |  |                   |     |  
|Revenue, non-regulated                                                                                                               |  |                   | 1   |  
|                                                                                                                                     |  |                   |     |  
|Total                                                                                                                                |  | $                 | 1   |  
|                                                                                                                                     |  |                   |     |  



The valuation method of the
primary fair value measurements disclosed above are as follows:

Commodity derivatives: The pricing for commodity derivatives is primarily a
calculated value which incorporates the forward price and is adjusted for liquidity (bid-ask spread), credit or non-performance risk (after reflecting credit enhancements such as collateral) and discounted to present value. The primary difference
between a Level 2 and a Level 3 measurement has to do with the level of activity in forward markets for the commodity. If the market is relatively inactive, the measurement is deemed to be a Level 3 measurement. Some commodity derivatives are NYMEX
contracts, which Duke Energy Ohio classifies as Level 1 measurements.



13. New
Accounting Standards

The following new accounting standards were adopted by Duke Energy Ohio subsequent to March 31, 2007 and the impact of
such adoption, if applicable, has been presented in the accompanying Consolidated Financial Statements:

SFAS No. 157.Refer to Note 12
for a discussion of Duke Energy Ohios adoption of SFAS No. 157.

SFAS No. 159. Refer to Note 12 for a discussion of Duke Energy
Ohios adoption of SFAS No. 159.

FSP No. FIN 39-1. Refer to Note 1 for a discussion of Duke Energy Ohios adoption of FSP No.
FIN 39-1.

The following new accounting standards have been issued, but have not yet been adopted by Duke Energy Ohio as of March 31, 2008:

SFAS No. 141 (revised 2007), Business Combinations (SFAS No. 141R). In December 2007, the FASB issued SFAS
No. 141R, which replaces SFAS No. 141, Business Combinations. SFAS No. 141R retains the fundamental requirements in SFAS No. 141 that the acquisition method of accounting be used for all business combinations
and that an acquirer be identified for each business combination. This statement also establishes principles and requirements for how an acquirer recognizes and measures in its financial statements the identifiable assets acquired, the liabilities
assumed, any noncontrolling (minority) interests in an acquiree, and any goodwill acquired in a business combination or gain recognized from a bargain purchase. For Duke Energy Ohio, SFAS No. 141R must be applied prospectively



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##### Table of Contents

PART I

DUKE ENERGY OHIO, INC.

Notes To Unaudited Consolidated Financial Statements(Continued)



to business combinations for which the acquisition date occurs on or after January 1, 2009. The impact to Duke Energy Ohio of applying SFAS No. 141R for
periods subsequent to implementation will be dependent upon the nature of any transactions within the scope of SFAS No. 141R.

SFAS
No. 161, Disclosures about Derivative Instruments and Hedging Activitiesan amendment to FASB Statement No. 133 (SFAS No. 161).In March 2008, the FASB issued SFAS No. 161, which amends and expands the
disclosure requirements for derivative instruments and hedging activities prescribed by SFAS No. 133, Accounting for Derivative Instruments and Hedging Activities. SFAS No. 161 requires qualitative disclosures about
objectives and strategies for using derivatives, quantitative disclosures about fair value amounts of and gains and losses on derivative instruments, and disclosures about credit-risk-related contingent features in derivative agreements. Duke Energy
Ohio will adopt SFAS No. 161 as of January 1, 2009 and SFAS No. 161 encourages, but does not require, comparative disclosure for earlier periods at initial adoption. The adoption of SFAS No. 161 will not have any impact on Duke
Energy Ohios consolidated results of operations, cash flows or financial position.



14. Income Taxes and Other Taxes

The taxable income of Duke Energy Ohio is reflected in Duke Energys U.S. federal and state
income tax returns. Duke Energy Ohio has a tax sharing agreement with Duke Energy, where the separate return method is used to allocate tax expenses and benefits to the subsidiaries whose investments or results of operations provide these tax
expenses and benefits. The accounting for income taxes essentially represents the income taxes that Duke Energy Ohio would incur if Duke Energy Ohio were a separate company filing its own tax return as a C-Corporation.

At March 31, 2008, Duke Energy Ohio has approximately $46 million recorded for unrecognized tax benefits and no portion of the total unrecognized tax benefits
that, if recognized, would affect the effective tax rate. Additionally, at March 31, 2008, Duke Energy Ohio has approximately $7 million of unrecognized tax benefits related to pre-merger tax positions that, if recognized, would affect
goodwill. It is reasonably possible that Duke Energy Ohio will reflect an approximate $35 million reduction in unrecognized tax benefits within the next twelve months due to expected settlements.

During the three months ended March 31, 2008, Duke Energy Ohio recognized net interest expense of approximately $1 million in the Consolidated Statements of
Operations related to income taxes. At March 31, 2008, Duke Energy Ohio had approximately $7 million of interest payable, which reflects all interest related to income taxes, and no amount has been accrued for the payment of penalties in the
Consolidated Balance Sheets.

Duke Energy Ohio has the following tax years open:



|             |  |                                                                                         
|------------ |  | ----------------------------------------------------------------------------------------
|Jurisdiction |  | Tax Years                                                                               
|Federal      |  | 2000 and after                                                                          
|State        |  | Closed through 2001, with the exception of any adjustments related to open federal years



Excise Taxes. Certain
excise taxes levied by state or local governments are collected by Duke Energy Ohio from its customers. These taxes, which are required to be paid regardless of Duke Energy Ohios ability to collect from the customer, are accounted for on a
gross basis. When Duke Energy Ohio acts as an agent, and the tax is not required to be remitted if it is not collected from the customer, the taxes are accounted for on a net basis. Duke Energy Ohios excise taxes accounted for on a gross basis
and recorded as Operating Revenues in the accompanying Consolidated Statements of Operations for the three months ended March 31, 2008 and 2007 were as follows:



|             |  |                                 |    |                                 |   |   
|------------ |  | ------------------------------- | -- | ------------------------------- | - | --
|             |  | Three MonthsEndedMarch 31, 2008 |    | Three MonthsEndedMarch 31, 2007
|             |  | (in millions)                  
|Excise Taxes |  | $                               | 39 |                                 | $ | 39
|             |  |                                 |    |                                 |   |   



15. Subsequent Events

For information on subsequent events related to debt and credit facilities, regulatory matters and commitments and contingencies, see Notes 5, 10 and 11,
respectively.



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##### Table of Contents

PART I



Item 2. Managements Discussion and Analysis of Financial Condition and Results of Operations.



INTRODUCTION



EXECUTIVE OVERVIEW

Managements Discussion and Analysis should be read in conjunction with the Consolidated Financial
Statements.

Duke Energy Ohio, Inc. (Duke Energy Ohio), is a wholly-owned subsidiary of Duke Energy Corp. (Duke Energy). Duke Energy Ohios
principal lines of business include generation, transmission and distribution of electricity, the sale of and/or transportation of natural gas, and energy marketing.



BASIS OF PRESENTATION

The results of
operations and variance discussion for Duke Energy Ohio is presented in a reduced disclosure format in accordance with General Instructions H(2) of Form 10-Q.



RESULTS OF OPERATIONS

Results of Operations and Variances

Summary of Results (in millions)



|                                                       |  |                             |     |      |   |     |                    |  |   |     |  
|------------------------------------------------------ |  | --------------------------- | --- | ---- | - | --- | ------------------ |  | - | --- | -
|                                                       |  | Three Months EndedMarch 31, |    
|                                                       |  | 2008                        |     | 2007 |   |     | Increase(Decrease) | 
|Operating revenues                                     |  | $                           | 991 |      | $ | 916 |                    |  | $ | 75  |  
|Operating expenses                                     |  |                             | 781 |      |   | 831 |                    |  |   | (50 | )
|Gains (losses) on sales of other assets and other, net |  |                             | 13  |      |   | (11 | )                  |  |   | 24  |  
|                                                       |  |                             |     |      |   |     |                    |  |   |     |  
|Operating income                                       |  |                             | 223 |      |   | 74  |                    |  |   | 149 |  
|Other income and expenses, net                         |  |                             | 9   |      |   | 9   |                    |  |   |    |  
|Interest expense                                       |  |                             | 26  |      |   | 23  |                    |  |   | 3   |  
|Income tax expense                                     |  |                             | 73  |      |   | 23  |                    |  |   | 50  |  
|                                                       |  |                             |     |      |   |     |                    |  |   |     |  
|Net income                                             |  | $                           | 133 |      | $ | 37  |                    |  | $ | 96  |  
|                                                       |  |                             |     |      |   |     |                    |  |   |     |  

The $96 million increase in Duke Energy Ohios Net Income was primarily due to the following factors:



Operating Revenues.

The $75 million increase in operating revenues was driven primarily by:

| |  |  | A $30 million increase in net mark-to-market revenues on non-qualifying power and capacity hedge contracts, consisting of mark-to-market losses of $14 million in 2008
compared to losses of $44 million in 2007,
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | An $18 million increase in retail demand resulting from favorable weather in 2008 compared to 2007,
| | - |  | ---------------------------------------------------------------------------------------------------

| |  |  | A $17 million increase in revenues from the Midwest gas-fired generation assets due primarily to higher generation due to favorable weather in 2008 compared to 2007 and
higher PJM capacity revenues,
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | A $15 million increase in regulated fuel revenues driven mainly by higher natural gas costs, and
| | - |  | ------------------------------------------------------------------------------------------------

| |  |  | An $11 million increase in retail electric revenues primarily due to increased amortization of purchase accounting valuation liability of rate stabilization plan.
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------



Partially offsetting these increases was:

| |  |  | A $16 million decrease in volumes of coal sales due to expiration of contracts.
| | - |  | -------------------------------------------------------------------------------



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PART I



Operating Expenses.

The $50 million decrease in operating
expenses was driven primarily by:

| |  |  | A $40 million decrease in fuel expense due to mark-to-market gains on non-qualifying fuel hedge contracts of $58 million in 2008 compared to gains of $18 million in 2007,
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | An $18 million decrease due primarily to lower sulfur dioxide emission allowance expenses due to installation of flue gas desulphurization equipment, and
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------

| |  |  | A $17 million decrease in expenses associated with coal sales due to expiration of contracts.
| | - |  | ---------------------------------------------------------------------------------------------



Partially offsetting these decreases were:

| |  |  | A $16 million increase in regulated fuel expense primarily due to higher natural gas costs, and
| | - |  | -----------------------------------------------------------------------------------------------

| |  |  | A $7 million increase in fuel and operating expenses for the Midwest gas-fired generation assets primarily due to increased generation volumes in 2008 compared to 2007.
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------



Gains (Losses) on Sales of Other Assets and Other,
net.

The $24 million increase in gains (losses) on sales of other assets and other, net is attributable to gains on sales of emission allowances
in 2008 compared to losses on sales of emission allowances in 2007.



Income Tax Expense.

The $50 million increase in Income Tax Expense was primarily due to an increase in pre-tax income.



OTHER MATTERS

At March 31, 2008, Duke Energy Ohio had approximately $440 million of auction rate pollution control bonds outstanding. The maximum auction rate for the majority of this auction rate debt is 1.75 times one-month LIBOR. While
Duke Energy Ohio has plans to refund and refinance these tax exempt auction rate bonds, the timing of such refinancing transactions is uncertain and subject to market conditions.



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##### Table of Contents

PART I



Item 4.Controls and Procedures.



Disclosure Controls and Procedures

Disclosure controls and procedures are controls and other procedures that are designed to ensure
that information required to be disclosed by Duke Energy Ohio in the reports it files or submits under the Securities Exchange Act of 1934 (Exchange Act) is recorded, processed, summarized, and reported, within the time periods specified by the
Securities and Exchange Commissions (SEC) rules and forms.

Disclosure controls and procedures include, without limitation, controls and
procedures designed to provide reasonable assurance that information required to be disclosed by Duke Energy Ohio in the reports it files or submits under the Exchange Act is accumulated and communicated to management, including the Chief Executive
Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.

Under the supervision and with the
participation of management, including the Chief Executive Officer and Chief Financial Officer, Duke Energy Ohio has evaluated the effectiveness of its disclosure controls and procedures (as such term is defined in Rule 13a-15(e) and 15d-15(e) under
the Exchange Act) as of March 31, 2008, and, based upon this evaluation, the Chief Executive Officer and Chief Financial Officer have concluded that these controls and procedures are effective in providing reasonable assurance of compliance.



Changes in Internal Control over Financial Reporting

Under the supervision and with the participation of management, including the Chief Executive Officer and Chief Financial Officer, Duke Energy Ohio has evaluated
changes in internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) that occurred during the fiscal quarter ended March 31, 2008 and, other than the third party sourcing
arrangement discussed below, found no change that has materially affected, or is reasonably likely to materially affect, internal control over financial reporting.

During the first quarter of 2008, Duke Energy Ohio transferred payroll processing to the same third party provider currently used by other Duke Energy subsidiaries. Duke Energy Ohio reviewed the impact of this change on Duke
Energy Ohios internal control over financial reporting and made changes to internal control over financial reporting related to the data transmission to, and receipt from, the third party provider.



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##### Table of Contents

PART II. OTHER INFORMATION



Item 1. Legal Proceedings

For information regarding legal proceedings that became reportable events or in which
there were material developments in the first quarter of 2008, see Note 10 to the Consolidated Financial Statements, Regulatory Matters and Note 11 to the Consolidated Financial Statements, Commitments and Contingencies.



Item 1A. Risk Factors

In addition to the other information set forth in this report, careful consideration should
be given to the factors discussed in Part I, Item 1A. Risk Factors in Duke Energy Ohios Annual Report on Form 10-K for the year ended December 31, 2007, which could materially affect Duke Energy Ohios financial condition
or future results. Additional risks and uncertainties not currently known to Duke Energy Ohio or that Duke Energy Ohio currently deems to be immaterial also may adversely affect Duke Energy Ohios financial condition and/or results of
operations.



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##### Table of Contents

PART II



Item 6. Exhibits



(a) Exhibits

Exhibits filed or furnished herewith are designated by an asterisk (*).



|               |  |                                                                                                                                                              
|-------------- |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibit Number |  |                                                                                                                                                              
|10.1           |  | Amendment No. 1 to the Amended and Restated Credit Agreement (filed on Form 8-K of Duke Energy Ohio, Inc., March 12, 2008, File No. 1-1232, as Exhibit 10.1).
|               | 
|*31.1          |  | Certification of the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                                                      
|               | 
|*31.2          |  | Certification of the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                                                      
|               | 
|*32.1          |  | Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.                                      
|               | 
|*32.2          |  | Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.                                      



The total amount of securities
of the registrant or its subsidiaries authorized under any instrument with respect to long-term debt not filed as an exhibit does not exceed 10% of the total assets of the registrant and its subsidiaries on a consolidated basis. The registrant
agrees, upon request of the Securities and Exchange Commission, to furnish copies of any or all of such instruments to it.



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PART II



SIGNATURES



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 thereunto duly authorized.



|                   |  |  |  |                                                            
|------------------ |  |  |  | -----------------------------------------------------------
|                   |  | 
|                   |  |  |  | DUKE ENERGY OHIO, INC.                                     
|                   |  | 
|Date: May 15, 2008 |  |  |  | /S/    DAVID L.
HAUSER                                     
|                   |  |  |  | David L. Hauser Group
Executive and Chief Financial Officer
|                   |  | 
|Date: May 15, 2008 |  |  |  | /S/    STEVEN K.
YOUNG                                     
|                   |  |  |  | Steven K. Young Senior Vice
President and Controller       



30