1. Organization and Basis of Presentation

Organization. Duke Energy Corporation (collectively with its subsidiaries, Duke Energy) is an energy company primarily located in the Americas. Duke Energy operates in the United States (U.S.) primarily through its direct and indirect wholly-owned subsidiaries, Duke Energy Carolinas, LLC (Duke Energy Carolinas), Duke Energy Ohio, Inc. (Duke Energy Ohio), which includes Duke Energy Kentucky, Inc. (Duke Energy Kentucky), and Duke Energy Indiana, Inc. (Duke Energy Indiana), as well as in South and Central America through International Energy. When discussing Duke Energy's condensed consolidated financial information, it necessarily includes the results of its three separate subsidiary registrants, Duke Energy Carolinas, Duke Energy Ohio and Duke Energy Indiana (collectively referred to as the Subsidiary Registrants), which, along with Duke Energy, are collectively referred to as the Duke Energy Registrants. The information in these combined notes relates to each of the Duke Energy Registrants as noted in the Index to the Combined Notes. However, none of the registrants makes any representation as to information related solely to Duke Energy or the subsidiaries of Duke Energy other than itself. See Note 2 for information related to reportable operating segments for each of the Duke Energy Registrants.

Duke Energy Carolinas generates, transmits, distributes and sells electricity in North Carolina and South Carolina. Duke Energy Carolinas is subject to the regulatory provisions of the North Carolina Utilities Commission (NCUC), the Public Service Commission of South Carolina (PSCSC), the U.S. Nuclear Regulatory Commission (NRC) and the Federal Energy Regulatory Commission (FERC). Substantially all of Duke Energy Carolinas' operations are regulated and qualify for regulatory accounting treatment.

Duke Energy Ohio is a wholly-owned subsidiary of Cinergy Corp. (Cinergy), which is a wholly-owned subsidiary of Duke Energy. Duke Energy Ohio is a combination electric and gas public utility that provides service in the southwestern portion of Ohio and in northern Kentucky through its wholly-owned subsidiary Duke Energy Kentucky, as well as electric generation in parts of Ohio, Illinois, Indiana and Pennsylvania. Duke Energy Ohio's principal lines of business include generation, transmission and distribution of electricity, and the sale of and/or transportation of natural gas. Duke Energy Ohio is subject to the regulatory provisions of the Public Utilities Commission of Ohio (PUCO), the Kentucky Public Service Commission (KPSC) and the FERC. Duke Energy Ohio applies regulatory accounting treatment to substantially all of the operations of its Franchised Electric and Gas operating segment and to certain rate riders associated with retail generation of its Commercial Power operating segment. See Note 2 for information about business segments.

Duke Energy Indiana is a wholly-owned subsidiary of Cinergy. Duke Energy Indiana is an electric utility that provides service in north central, central, and southern Indiana. Its primary line of business is generation, transmission and distribution of electricity. Duke Energy Indiana is subject to the regulatory provisions of the Indiana Utility Regulatory Commission (IURC) and the FERC. The substantial majority of Duke Energy Indiana's operations are regulated and qualify for regulatory accounting treatment.

See Note 3 for information regarding Duke Energy's pending merger with Progress Energy, Inc (Progress)

Basis of Presentation. These Unaudited Condensed Consolidated Financial Statements have been prepared in accordance with generally accepted accounting principles (GAAP) in the U.S. for interim financial information and with the instructions to Form 10-Q and Regulation S-X. Accordingly, these Unaudited Condensed Consolidated Financial Statements do not include all of the information and notes required by GAAP in the U.S. for annual financial statements. Because the interim Unaudited Condensed Consolidated Financial Statements and Notes do not include all of the information and notes required by GAAP in the U.S. for annual financial statements, the Unaudited Condensed Consolidated Financial Statements and other information included in this quarterly report should be read in conjunction with the respective Consolidated Financial Statements and Notes in Duke Energy's, Duke Energy Carolinas', Duke Energy Ohio's and Duke Energy Indiana's respective Form 10-K for the year ended December 31, 2010. These Unaudited Condensed Consolidated Financial Statements reflect all normal recurring adjustments that are, in the opinion of the respective company's management, necessary to fairly present the financial position and results of operations of each Duke Energy Registrant. Amounts reported in each Duke Energy Registrants' interim Unaudited Condensed 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.

These Unaudited Condensed Consolidated Financial Statements include, after eliminating intercompany transactions and balances, the accounts of the Duke Energy Registrants and all majority-owned subsidiaries where the respective Duke Energy Registrants have control and those variable interest entities (VIEs) where the respective Duke Energy Registrants are the primary beneficiary. These Unaudited Condensed Consolidated Financial Statements also reflect Duke Energy Carolinas' approximate 19.25% proportionate share of the Catawba Nuclear Station, as well as Duke Energy Ohio's proportionate share of certain generation and transmission facilities in Ohio, Indiana and Kentucky and Duke Energy Indiana's proportionate share of certain generation and transmission facilities.

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

Unbilled Revenue. Revenues on sales of electricity and gas are recognized when either the service is provided or the product is delivered. Unbilled retail revenues are estimated by applying average revenue per kilowatt-hour or per thousand cubic feet (Mcf) for all customer classes to the number of estimated kilowatt-hours or Mcfs delivered but not billed. Unbilled wholesale energy revenues are calculated by applying the contractual rate per megawatt-hour (MWh) to the number of estimated MWh delivered but not yet billed. Unbilled wholesale demand revenues are calculated by applying the contractual rate per megawatt (MW) to the MW volume delivered but not yet billed. The amount of unbilled revenues can vary significantly from period to period as a result of numerous factors, including seasonality, weather, customer usage patterns and customer mix.

At June 30, 2011 and December 31, 2010, Duke Energy, Duke Energy Carolinas and Duke Energy Ohio had unbilled revenues within Restricted Receivables of Variable Interest Entities and Receivables on their respective Condensed Consolidated Balance Sheets as follows:


	June 30, 2011			December 31, 2010
		(in millions)
Duke Energy		$	700		$	751
Duke Energy Carolinas			327			322
Duke Energy Ohio^(a)			35			54

(a)	Primarily relates to wholesale sales within the Commercial Power segment.

Additionally, Duke Energy Ohio and Duke Energy Indiana sell, on a revolving basis, nearly all of their retail and wholesale accounts receivable to Cinergy Receivables. These transfers meet sales/derecognition criteria and therefore, Duke Energy Ohio and Duke Energy Indiana, account for the transfers of receivables to Cinergy Receivables as sales, and accordingly the receivables sold are not reflected on the Condensed Consolidated Balance Sheets of Duke Energy Ohio and Duke Energy Indiana. Receivables for unbilled revenues related to retail and wholesale accounts receivable at Duke Energy Ohio and Duke Energy Indiana included in the sales of accounts receivable to Cinergy Receivables at June 30, 2011 and December 31, 2010 were as follows:


	June 30, 2011		December 31, 2010
	(in millions)
Duke Energy Ohio	$	64	$	112
Duke Energy Indiana		104		125

See Note 11 for additional information.

Organization and Basis of Presentation

1. Organization and Basis of Presentation

Organization. Duke Energy Corporation (collectively with its subsidiaries, Duke Energy) is an energy company primarily located in the Americas. Duke Energy operates in the United States (U.S.) primarily through its direct and indirect wholly-owned subsidiaries, Duke Energy Carolinas, LLC (Duke Energy Carolinas), Duke Energy Ohio, Inc. (Duke Energy Ohio), which includes Duke Energy Kentucky, Inc. (Duke Energy Kentucky), and Duke Energy Indiana, Inc. (Duke Energy Indiana), as well as in South and Central America through International Energy. When discussing Duke Energy's condensed consolidated financial information, it necessarily includes the results of its three separate subsidiary registrants, Duke Energy Carolinas, Duke Energy Ohio and Duke Energy Indiana (collectively referred to as the Subsidiary Registrants), which, along with Duke Energy, are collectively referred to as the Duke Energy Registrants. The information in these combined notes relates to each of the Duke Energy Registrants as noted in the Index to the Combined Notes. However, none of the registrants makes any representation as to information related solely to Duke Energy or the subsidiaries of Duke Energy other than itself. See Note 2 for information related to reportable operating segments for each of the Duke Energy Registrants.

Duke Energy Carolinas generates, transmits, distributes and sells electricity in North Carolina and South Carolina. Duke Energy Carolinas is subject to the regulatory provisions of the North Carolina Utilities Commission (NCUC), the Public Service Commission of South Carolina (PSCSC), the U.S. Nuclear Regulatory Commission (NRC) and the Federal Energy Regulatory Commission (FERC). Substantially all of Duke Energy Carolinas' operations are regulated and qualify for regulatory accounting treatment.

Duke Energy Ohio is a wholly-owned subsidiary of Cinergy Corp. (Cinergy), which is a wholly-owned subsidiary of Duke Energy. Duke Energy Ohio is a combination electric and gas public utility that provides service in the southwestern portion of Ohio and in northern Kentucky through its wholly-owned subsidiary Duke Energy Kentucky, as well as electric generation in parts of Ohio, Illinois, Indiana and Pennsylvania. Duke Energy Ohio's principal lines of business include generation, transmission and distribution of electricity and the sale of and/or transportation of natural gas. Duke Energy Ohio is subject to the regulatory provisions of the Public Utilities Commission of Ohio (PUCO), the Kentucky Public Service Commission (KPSC) and the FERC. Duke Energy Ohio applies regulatory accounting treatment to substantially all of the operations of its Franchised Electric and Gas operating segment and to certain rate riders associated with retail generation of its Commercial Power operating segment. See Note 2 for information about business segments.

Duke Energy Indiana is a wholly-owned subsidiary of Cinergy. Duke Energy Indiana is an electric utility that provides service in north central, central, and southern Indiana. Its primary line of business is generation, transmission and distribution of electricity. Duke Energy Indiana is subject to the regulatory provisions of the Indiana Utility Regulatory Commission (IURC) and the FERC. The substantial majority of Duke Energy Indiana's operations are regulated and qualify for regulatory accounting treatment.

See Note 3 for information regarding Duke Energy's pending merger with Progress Energy, Inc (Progress).

Basis of Presentation. These Unaudited Condensed Consolidated Financial Statements have been prepared in accordance with generally accepted accounting principles (GAAP) in the U.S. for interim financial information and with the instructions to Form 10-Q and Regulation S-X. Accordingly, these Unaudited Condensed Consolidated Financial Statements do not include all of the information and notes required by GAAP in the U.S. for annual financial statements. Because the interim Unaudited Condensed Consolidated Financial Statements and Notes do not include all of the information and notes required by GAAP in the U.S. for annual financial statements, the Unaudited Condensed Consolidated Financial Statements and other information included in this quarterly report should be read in conjunction with the respective Consolidated Financial Statements and Notes in Duke Energy's, Duke Energy Carolinas', Duke Energy Ohio's and Duke Energy Indiana's respective Form 10-K for the year ended December 31, 2010. These Unaudited Condensed Consolidated Financial Statements reflect all normal recurring adjustments that are, in the opinion of the respective company's management, necessary to fairly present the financial position and results of operations of each Duke Energy Registrant. Amounts reported in each Duke Energy Registrants' interim Unaudited Condensed 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.

These Unaudited Condensed Consolidated Financial Statements include, after eliminating intercompany transactions and balances, the accounts of the Duke Energy Registrants and all majority-owned subsidiaries where the respective Duke Energy Registrants have control and those variable interest entities (VIEs) where the respective Duke Energy Registrants are the primary beneficiary. These Unaudited Condensed Consolidated Financial Statements also reflect Duke Energy Carolinas' approximate 19.25% proportionate share of the Catawba Nuclear Station, as well as Duke Energy Ohio's proportionate share of certain generation and transmission facilities in Ohio, Indiana and Kentucky and Duke Energy Indiana's proportionate share of certain generation and transmission facilities.

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

Unbilled Revenue. Revenues on sales of electricity and gas are recognized when either the service is provided or the product is delivered. Unbilled retail revenues are estimated by applying average revenue per kilowatt-hour or per thousand cubic feet (Mcf) for all customer classes to the number of estimated kilowatt-hours or Mcfs delivered but not billed. Unbilled wholesale energy revenues are calculated by applying the contractual rate per megawatt-hour (MWh) to the number of estimated MWh delivered but not yet billed. Unbilled wholesale demand revenues are calculated by applying the contractual rate per megawatt (MW) to the MW volume delivered but not yet billed. The amount of unbilled revenues can vary significantly from period to period as a result of numerous factors, including seasonality, weather, customer usage patterns and customer mix.

At June 30, 2011 and December 31, 2010, Duke Energy, Duke Energy Carolinas and Duke Energy Ohio had unbilled revenues within Restricted Receivables of Variable Interest Entities and Receivables on their respective Condensed Consolidated Balance Sheets as follows:


	June 30, 2011		December 31, 2010
	(in millions)
Duke Energy	$	700	$	751
Duke Energy Carolinas		327		322
Duke Energy Ohio^(a)		35		54

(a)	Primarily relates to wholesale sales within the Commercial Power segment.

Additionally, Duke Energy Ohio and Duke Energy Indiana sell, on a revolving basis, nearly all of their retail and wholesale accounts receivable to Cinergy Receivables. These transfers meet sales/derecognition criteria and therefore, Duke Energy Ohio and Duke Energy Indiana, account for the transfers of receivables to Cinergy Receivables as sales, and accordingly the receivables sold are not reflected on the Condensed Consolidated Balance Sheets of Duke Energy Ohio and Duke Energy Indiana. Receivables for unbilled revenues related to retail and wholesale accounts receivable at Duke Energy Ohio and Duke Energy Indiana included in the sales of accounts receivable to Cinergy Receivables at June 30, 2011 and December 31, 2010 were as follows:


	June 30, 2011		December 31, 2010
	(in millions)
Duke Energy Ohio	$	64	$	112
Duke Energy Indiana		104		125