10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(Mark One)

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

For the quarterly period ended September 30, 2021

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	Registrant, State of Incorporation or Organization, Address of Principal Executive Offices and Telephone Number	IRS Employer Identification Number
1-32853	DUKE ENERGY CORPORATION	20-2777218

(a Delaware corporation)

526 South Church Street

Charlotte, North Carolina 28202-1803

704-382-3853

1-4928 DUKE ENERGY CAROLINAS, LLC 56-0205520

(a North Carolina limited liability company)

526 South Church Street

Charlotte, North Carolina 28202-1803

704-382-3853

1-15929 PROGRESS ENERGY, INC. 56-2155481

(a North Carolina corporation)

410 South Wilmington Street

Raleigh, North Carolina 27601-1748

704-382-3853

1-3382 DUKE ENERGY PROGRESS, LLC 56-0165465

(a North Carolina limited liability company)

410 South Wilmington Street

Raleigh, North Carolina 27601-1748

704-382-3853

1-3274 DUKE ENERGY FLORIDA, LLC 59-0247770

(a Florida limited liability company)

299 First Avenue North

St. Petersburg, Florida 33701

704-382-3853

1-1232 DUKE ENERGY OHIO, INC. 31-0240030

(an Ohio corporation)

139 East Fourth Street

Cincinnati, Ohio 45202

704-382-3853

1-3543 DUKE ENERGY INDIANA, LLC 35-0594457

(an Indiana limited liability company)

1000 East Main Street

Plainfield, Indiana 46168

704-382-3853

1-6196 PIEDMONT NATURAL GAS COMPANY, INC. 56-0556998

(a North Carolina corporation)

4720 Piedmont Row Drive

Charlotte, North Carolina 28210

704-364-3120

SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:

Name of each exchange on

Registrant    Title of each class    Trading symbols        which registered

Duke Energy    Common Stock, $0.001 par value    DUK    New York Stock Exchange LLC

Duke Energy    5.625% Junior Subordinated Debentures due    DUKB    New York Stock Exchange LLC

September 15, 2078

Duke Energy    Depositary Shares, each representing a 1/1,000th    DUK PR A    New York Stock Exchange LLC

interest in a share of 5.75% Series A Cumulative

Redeemable Perpetual Preferred Stock, par value

$0.001 per share

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Duke Energy Corporation (Duke Energy)	Yes	☒	No	☐	Duke Energy Florida, LLC (Duke Energy Florida)	Yes	☒	No	☐
Duke Energy Carolinas, LLC (Duke Energy Carolinas)	Yes	☒	No	☐	Duke Energy Ohio, Inc. (Duke Energy Ohio)	Yes	☒	No	☐
Progress Energy, Inc. (Progress Energy)	Yes	☒	No	☐	Duke Energy Indiana, LLC (Duke Energy Indiana)	Yes	☒	No	☐
Duke Energy Progress, LLC (Duke Energy Progress)	Yes	☒	No	☐	Piedmont Natural Gas Company, Inc. (Piedmont)	Yes	☒	No	☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).

Duke Energy	Yes	☒	No	☐	Duke Energy Florida	Yes	☒	No	☐
Duke Energy Carolinas	Yes	☒	No	☐	Duke Energy Ohio	Yes	☒	No	☐
Progress Energy	Yes	☒	No	☐	Duke Energy Indiana	Yes	☒	No	☐
Duke Energy Progress	Yes	☒	No	☐	Piedmont	Yes	☒	No	☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Duke Energy	Large Accelerated Filer	☒	Accelerated filer	☐	Non-accelerated Filer	☐	Smaller reporting company	☐	Emerging growth company	☐
Duke Energy Carolinas	Large Accelerated Filer	☐	Accelerated filer	☐	Non-accelerated Filer	☒	Smaller reporting company	☐	Emerging growth company	☐
Progress Energy	Large Accelerated Filer	☐	Accelerated filer	☐	Non-accelerated Filer	☒	Smaller reporting company	☐	Emerging growth company	☐
Duke Energy Progress	Large Accelerated Filer	☐	Accelerated filer	☐	Non-accelerated Filer	☒	Smaller reporting company	☐	Emerging growth company	☐
Duke Energy Florida	Large Accelerated Filer	☐	Accelerated filer	☐	Non-accelerated Filer	☒	Smaller reporting company	☐	Emerging growth company	☐
Duke Energy Ohio	Large Accelerated Filer	☐	Accelerated filer	☐	Non-accelerated Filer	☒	Smaller reporting company	☐	Emerging growth company	☐
Duke Energy Indiana	Large Accelerated Filer	☐	Accelerated filer	☐	Non-accelerated Filer	☒	Smaller reporting company	☐	Emerging growth company	☐
Piedmont	Large Accelerated Filer	☐	Accelerated filer	☐	Non-accelerated Filer	☒	Smaller reporting company	☐	Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

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

Duke Energy	Yes	☐	No	☒	Duke Energy Florida	Yes	☐	No	☒
Duke Energy Carolinas	Yes	☐	No	☒	Duke Energy Ohio	Yes	☐	No	☒
Progress Energy	Yes	☐	No	☒	Duke Energy Indiana	Yes	☐	No	☒
Duke Energy Progress	Yes	☐	No	☒	Piedmont	Yes	☐	No	☒

Number of shares of common stock outstanding at October 31, 2021:

Registrant	Description	Shares
Duke Energy	Common stock, $0.001 par value	769,343,372

This combined Form 10-Q is filed separately by eight registrants: Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida, Duke Energy Ohio, Duke Energy Indiana and Piedmont (collectively the Duke Energy Registrants). Information contained herein relating to any individual registrant is filed by such registrant solely on its own behalf. Each registrant makes no representation as to information relating exclusively to the other registrants.

Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida, Duke Energy Ohio, Duke Energy Indiana and Piedmont meet the conditions set forth in General Instructions H(1)(a) and (b) of Form 10-Q and are therefore filing this form with the reduced disclosure format specified in General Instructions H(2) of Form 10-Q.

TABLE OF CONTENTS

	Cautionary Statement Regarding Forward-Looking Information
PART I. FINANCIAL INFORMATION
Item 1.	Financial Statements
	Duke Energy Corporation Financial Statements	9
	Duke Energy Carolinas, LLC Financial Statements	15
	Progress Energy, Inc. Financial Statements	19
	Duke Energy Progress, LLC Financial Statements	23
	Duke Energy Florida, LLC Financial Statements	27
	Duke Energy Ohio, Inc. Financial Statements	31
	Duke Energy Indiana, LLC Financial Statements	35
	Piedmont Natural Gas Company, Inc. Financial Statements	39
	Combined Notes to Condensed Consolidated Financial Statements
	Note 1 – Organization and Basis of Presentation	43
	Note 2 – Business Segments	45
	Note 3 – Regulatory Matters	49
	Note 4 – Commitments and Contingencies	59
	Note 5 – Debt and Credit Facilities	62
	Note 6 – Goodwill	63
	Note 7 – Related Party Transactions	64
	Note 8 – Derivatives and Hedging	65
	Note 9 – Investments in Debt and Equity Securities	70
	Note 10 – Fair Value Measurements	75
	Note 11 – Variable Interest Entities	80
	Note 12 – Revenue	83
	Note 13 – Stockholders' Equity	89
	Note 14 – Employee Benefit Plans	90
	Note 15 – Income Taxes	91
	Note 16 – Subsequent Events	92
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	93
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	110
Item 4.	Controls and Procedures	111
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	112
Item 1A.	Risk Factors	112
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	112
Item 6.	Exhibits	113
	Signatures	116

FORWARD-LOOKING STATEMENTS

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 and can often be identified by terms and phrases that include “anticipate,” “believe,” “intend,” “estimate,” “expect,” “continue,” “should,” “could,” “may,” “plan,” “project,” “predict,” “will,” “potential,” “forecast,” “target,” “guidance,” “outlook” or other similar terminology. Various factors may cause actual results to be materially different than the suggested outcomes within forward-looking statements; accordingly, there is no assurance that such results will be realized. These factors include, but are not limited to:

◦The impact of the COVID-19 pandemic;

◦State, federal and foreign legislative and regulatory initiatives, including costs of compliance with existing and future environmental requirements, including those related to climate change, as well as rulings that affect cost and investment recovery or have an impact on rate structures or market prices;

◦The extent and timing of costs and liabilities to comply with federal and state laws, regulations and legal requirements related to coal ash remediation, including amounts for required closure of certain ash impoundments, are uncertain and difficult to estimate;

◦The ability to recover eligible costs, including amounts associated with coal ash impoundment retirement obligations and costs related to significant weather events, and to earn an adequate return on investment through rate case proceedings and the regulatory process;

◦The costs of decommissioning nuclear facilities could prove to be more extensive than amounts estimated and all costs may not be fully recoverable through the regulatory process;

◦Costs and effects of legal and administrative proceedings, settlements, investigations and claims;

◦Industrial, commercial and residential growth or decline in service territories or customer bases resulting from sustained downturns of the economy and the economic health of our service territories or variations in customer usage patterns, including energy efficiency efforts and use of alternative energy sources, such as self-generation and distributed generation technologies;

◦Federal and state regulations, laws and other efforts designed to promote and expand the use of energy efficiency measures and distributed generation technologies, such as private solar and battery storage, in Duke Energy service territories could result in customers leaving the electric distribution system, excess generation resources as well as stranded costs;

◦Advancements in technology;

◦Additional competition in electric and natural gas markets and continued industry consolidation;

◦The influence of weather and other natural phenomena on operations, including the economic, operational and other effects of severe storms, hurricanes, droughts, earthquakes and tornadoes, including extreme weather associated with climate change;

◦Changing customer expectations and demands including heightened emphasis on environmental, social and governance concerns;

◦The ability to successfully operate electric generating facilities and deliver electricity to customers including direct or indirect effects to the company resulting from an incident that affects the U.S. electric grid or generating resources;

◦Operational interruptions to our natural gas distribution and transmission activities;

◦The availability of adequate interstate pipeline transportation capacity and natural gas supply;

◦The impact on facilities and business from a terrorist attack, cybersecurity threats, data security breaches, operational accidents, information technology failures or other catastrophic events, such as fires, explosions, pandemic health events or other similar occurrences;

◦The inherent risks associated with the operation of nuclear facilities, including environmental, health, safety, regulatory and financial risks, including the financial stability of third-party service providers;

◦The timing and extent of changes in commodity prices and interest rates and the ability to recover such costs through the regulatory process, where appropriate, and their impact on liquidity positions and the value of underlying assets;

◦The results of financing efforts, including the ability to obtain financing on favorable terms, which can be affected by various factors, including credit ratings, interest rate fluctuations, compliance with debt covenants and conditions and general market and economic conditions;

◦Credit ratings of the Duke Energy Registrants may be different from what is expected;

◦Declines in the market prices of equity and fixed-income securities and resultant cash funding requirements for defined benefit pension plans, other post-retirement benefit plans and nuclear decommissioning trust funds;

◦Construction and development risks associated with the completion of the Duke Energy Registrants’ capital investment projects, including risks related to financing, obtaining and complying with terms of permits, meeting construction budgets and schedules and satisfying operating and environmental performance standards, as well as the ability to recover costs from customers in a timely manner, or at all;

◦Changes in rules for regional transmission organizations, including changes in rate designs and new and evolving capacity markets, and risks related to obligations created by the default of other participants;

◦The ability to control operation and maintenance costs;

◦The level of creditworthiness of counterparties to transactions;

◦The ability to obtain adequate insurance at acceptable costs;

◦Employee workforce factors, including the potential inability to attract and retain key personnel;

FORWARD-LOOKING STATEMENTS

◦The ability of subsidiaries to pay dividends or distributions to Duke Energy Corporation holding company (the Parent);

◦The performance of projects undertaken by our nonregulated businesses and the success of efforts to invest in and develop new opportunities;

◦The effect of accounting pronouncements issued periodically by accounting standard-setting bodies;

◦The impact of U.S. tax legislation to our financial condition, results of operations or cash flows and our credit ratings;

◦The impacts from potential impairments of goodwill or equity method investment carrying values;

◦Asset or business acquisitions and dispositions, including our ability to successfully consummate the second closing of the minority investment in Duke Energy Indiana, may not yield the anticipated benefits;

◦The actions of activist shareholders could disrupt our operations, impact our ability to execute on our business strategy, or cause fluctuations in the trading price of our common stock; and

◦The ability to implement our business strategy, including enhancing existing technology systems.

Additional risks and uncertainties are identified and discussed in the Duke Energy Registrants' reports filed with the SEC and available at the SEC's website at sec.gov. 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 described. Forward-looking statements speak only as of the date they are made and the Duke Energy Registrants expressly disclaim an obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

GLOSSARY OF TERMS

Glossary of Terms 

The following terms or acronyms used in this Form 10-Q are defined below:

Term or Acronym	Definition
2013 Settlement	Revised and Restated Stipulation and Settlement Agreement approved in November 2013 among Duke Energy Florida, the Florida Office of Public Counsel and other customer representatives
2017 Settlement	Second Revised and Restated Settlement Agreement in 2017 among Duke Energy Florida, the Florida Office of Public Counsel and other customer representatives, which replaces and supplants the 2013 Settlement
2021 Settlement	Settlement Agreement in 2021 among Duke Energy Florida, the Florida Office of Public Counsel, the Florida Industrial Power Users Group, White Springs Agricultural Chemicals, Inc. d/b/a PSC Phosphate and NUCOR Steel Florida, Inc.
ACP	Atlantic Coast Pipeline, LLC, a limited liability company owned by Dominion Energy, Inc. and Duke Energy
ACP pipeline	The approximately 600-mile canceled interstate natural gas pipeline
AFS	Available for Sale
AFUDC	Allowance for funds used during construction
ARO	Asset retirement obligations
Bison	Bison Insurance Company Limited
Board	Duke Energy Board of Directors
CCR	Coal Combustion Residuals
Coal Ash Act	North Carolina Coal Ash Management Act of 2014
the company	Duke Energy Corporation and its subsidiaries
COVID-19	Coronavirus Disease 2019
CRC	Cinergy Receivables Company, LLC
Crystal River Unit 3	Crystal River Unit 3 Nuclear Plant
DEFPF	Duke Energy Florida Project Finance, LLC
DEFR	Duke Energy Florida Receivables, LLC
DEPR	Duke Energy Progress Receivables, LLC
DERF	Duke Energy Receivables Finance Company, LLC
Duke Energy	Duke Energy Corporation (collectively with its subsidiaries)
Duke Energy Ohio	Duke Energy Ohio, Inc.
Duke Energy Progress	Duke Energy Progress, LLC
Duke Energy Carolinas	Duke Energy Carolinas, LLC
Duke Energy Florida	Duke Energy Florida, LLC
Duke Energy Indiana	Duke Energy Indiana, LLC
Duke Energy Kentucky	Duke Energy Kentucky, Inc.
Duke Energy Registrants	Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida, Duke Energy Ohio, Duke Energy Indiana and Piedmont
EDIT	Excess deferred income tax
Elliott	Elliott Investment Management, L.P.
EPS	Earnings Per Share
ETR	Effective tax rate
Exchange Act	Securities Exchange Act of 1934
FERC	Federal Energy Regulatory Commission
FPSC	Florida Public Service Commission
FTR	Financial transmission rights
GAAP	Generally accepted accounting principles in the U.S.

GLOSSARY OF TERMS

GAAP Reported Earnings	Net Income Available to Duke Energy Corporation Common Stockholders
GAAP Reported EPS	Basic Earnings Per Share Available to Duke Energy Corporation common stockholders
GIC	GIC Private Limited, Singapore's sovereign wealth fund and an experienced investor in U.S. infrastructure
GWh	Gigawatt-hours
IMR	Integrity Management Rider
IRS	Internal Revenue Service
Investment Trusts	NDTF investments and grantor trusts of Duke Energy Progress, Duke Energy Florida and Duke Energy Indiana
IURC	Indiana Utility Regulatory Commission
KPSC	Kentucky Public Service Commission
LLC	Limited Liability Company
MGP	Manufactured gas plant
MW	Megawatt
MWh	Megawatt-hour
NCUC	North Carolina Utilities Commission
NDTF	Nuclear decommissioning trust funds
NPNS	Normal purchase/normal sale
OPEB	Other Post-Retirement Benefit Obligations
OVEC	Ohio Valley Electric Corporation
Piedmont	Piedmont Natural Gas Company, Inc.
PJM	Pennsylvania-New Jersey-Maryland Interconnection
PPA	Purchase Power Agreement
Progress Energy	Progress Energy, Inc.
PSCSC	Public Service Commission of South Carolina
PUCO	Public Utilities Commission of Ohio
RTO	Regional Transmission Organization
Subsidiary Registrants	Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida, Duke Energy Ohio, Duke Energy Indiana and Piedmont
the Tax Act	Tax Cuts and Jobs Act
TPUC	Tennessee Public Utility Commission
U.S.	United States
VIE	Variable Interest Entity
WACC	Weighted Average Cost of Capital

FINANCIAL STATEMENTS

ITEM 1. FINANCIAL STATEMENTS

DUKE ENERGY CORPORATION

Condensed Consolidated Statements of Operations

(Unaudited)

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in millions, except per share amounts)	2021		2020		2021		2020
Operating Revenues
Regulated electric	$	6,495	$	6,315	$	16,972	$	16,402
Regulated natural gas	263		214		1,314		1,115
Nonregulated electric and other	193		192		573		574
Total operating revenues	6,951		6,721		18,859		18,091
Operating Expenses
Fuel used in electric generation and purchased power	1,844		1,849		4,702		4,645
Cost of natural gas	75		41		430		299
Operation, maintenance and other	1,507		1,450		4,319		4,142
Depreciation and amortization	1,265		1,217		3,698		3,497
Property and other taxes	371		324		1,073		1,003
Impairment of assets and other charges	211		28		342		36
Total operating expenses	5,273		4,909		14,564		13,622
Gains on Sales of Other Assets and Other, net	9		2		11		10
Operating Income	1,687		1,814		4,306		4,479
Other Income and Expenses
Equity in earnings (losses) of unconsolidated affiliates	22		(80)		14		(2,004)
Other income and expenses, net	238		127		493		310
Total other income and expenses	260		47		507		(1,694)
Interest Expense	581		522		1,688		1,627
Income Before Income Taxes	1,366		1,339		3,125		1,158
Income Tax Expense (Benefit)	90		105		210		(74)
Net Income	1,276		1,234		2,915		1,232
Add: Net Loss Attributable to Noncontrolling Interests	129		70		247		208
Net Income Attributable to Duke Energy Corporation	1,405		1,304		3,162		1,440
Less: Preferred Dividends	39		39		92		93
Net Income Available to Duke Energy Corporation Common Stockholders	$	1,366	$	1,265	$	3,070	$	1,347
Earnings Per Share – Basic and Diluted
Net income available to Duke Energy Corporation common stockholders
Basic and Diluted	$	1.79	$	1.74	$	4.00	$	1.85
Weighted Average Shares Outstanding
Basic and Diluted	769		735		769		735

See Notes to Condensed Consolidated Financial Statements

9

FINANCIAL STATEMENTS

DUKE ENERGY CORPORATION

Condensed Consolidated Statements of Comprehensive Income

(Unaudited)

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in millions)	2021		2020		2021		2020
Net Income	$	1,276	$	1,234	$	2,915	$	1,232
Other Comprehensive Income (Loss), net of tax(a)
Pension and OPEB adjustments	1		1		3		1
Net unrealized gains (losses) on cash flow hedges	9		(83)		(59)		(159)
Reclassification into earnings from cash flow hedges	2		4		9		8
Unrealized (losses) gains on available-for-sale securities	(2)		(2)		(6)		5
Other Comprehensive Income (Loss), net of tax	10		(80)		(53)		(145)
Comprehensive Income	1,286		1,154		2,862		1,087
Add: Comprehensive Loss Attributable to Noncontrolling Interests	128		70		240		220
Comprehensive Income Attributable to Duke Energy	1,414		1,224		3,102		1,307
Less: Preferred Dividends	39		39		92		93
Comprehensive Income Available to Duke Energy Corporation Common Stockholders	$	1,375	$	1,185	$	3,010	$	1,214

(a)Net of income tax impacts of approximately $24 million for the three months ended September 30, 2020, and $16 million and $43 million for the nine months ended September 30, 2021, and 2020, respectively. All other periods presented include immaterial income tax impacts.

See Notes to Condensed Consolidated Financial Statements

10

FINANCIAL STATEMENTS

DUKE ENERGY CORPORATION

Condensed Consolidated Balance Sheets

(Unaudited)

(in millions)	September 30, 2021		December 31, 2020
ASSETS
Current Assets
Cash and cash equivalents	$	548	$	259
Receivables (net of allowance for doubtful accounts of $48 at 2021 and $29 at 2020)	998		1,009
Receivables of VIEs (net of allowance for doubtful accounts of $75 at 2021 and $117 at 2020)	2,431		2,144
Inventory	2,900		3,167
Regulatory assets (includes $54 at 2021 and $53 at 2020 related to VIEs)	1,791		1,641
Other (includes $347 at 2021 and $296 at 2020 related to VIEs)	768		462
Total current assets	9,436		8,682
Property, Plant and Equipment
Cost	160,652		155,580
Accumulated depreciation and amortization	(50,543)		(48,827)
Facilities to be retired, net	127		29
Net property, plant and equipment	110,236		106,782
Other Noncurrent Assets
Goodwill	19,303		19,303
Regulatory assets (includes $896 at 2021 and $937 at 2020 related to VIEs)	12,247		12,421
Nuclear decommissioning trust funds	9,861		9,114
Operating lease right-of-use assets, net	1,287		1,524
Investments in equity method unconsolidated affiliates	951		961
Other (includes $134 at 2021 and $81 at 2020 related to VIEs)	3,686		3,601
Total other noncurrent assets	47,335		46,924
Total Assets	$	167,007	$	162,388
LIABILITIES AND EQUITY
Current Liabilities
Accounts payable	$	2,888	$	3,144
Notes payable and commercial paper	2,098		2,873
Taxes accrued	908		482
Interest accrued	558		537
Current maturities of long-term debt (includes $221 at 2021 and $472 at 2020 related to VIEs)	4,873		4,238
Asset retirement obligations	673		718
Regulatory liabilities	1,319		1,377
Other	2,239		2,936
Total current liabilities	15,556		16,305
Long-Term Debt (includes $3,923 at 2021 and $3,535 at 2020 related to VIEs)	57,929		55,625
Other Noncurrent Liabilities
Deferred income taxes	9,875		9,244
Asset retirement obligations	12,278		12,286
Regulatory liabilities	15,530		15,029
Operating lease liabilities	1,093		1,340
Accrued pension and other post-retirement benefit costs	988		969
Investment tax credits	804		687
Other (includes $341 at 2021 and $316 at 2020 related to VIEs)	1,714		1,719
Total other noncurrent liabilities	42,282		41,274
Commitments and Contingencies
Equity
Preferred stock, Series A, $0.001 par value, 40 million depositary shares authorized and outstanding at 2021 and 2020	973		973
Preferred stock, Series B, $0.001 par value, 1 million shares authorized and outstanding at 2021 and 2020	989		989
Common stock, $0.001 par value, 2 billion shares authorized; 769 million shares outstanding at 2021 and 2020	1		1
Additional paid-in capital	44,348		43,767
Retained earnings	3,293		2,471
Accumulated other comprehensive loss	(297)		(237)
Total Duke Energy Corporation stockholders' equity	49,307		47,964
Noncontrolling interests	1,933		1,220
Total equity	51,240		49,184
Total Liabilities and Equity	$	167,007	$	162,388

See Notes to Condensed Consolidated Financial Statements

11

FINANCIAL STATEMENTS

DUKE ENERGY CORPORATION

Condensed Consolidated Statements of Cash Flows

(Unaudited)

	Nine Months Ended
	September 30,
(in millions)	2021		2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$	2,915	$	1,232
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	4,189		4,081
Equity in (earnings) losses of unconsolidated affiliates	(14)		2,004
Equity component of AFUDC	(126)		(112)
Impairment of assets and other charges	342		36
Deferred income taxes	206		210
Payments for asset retirement obligations	(389)		(463)
Provision for rate refunds	(41)		(15)
Refund of AMT credit carryforwards	—		572
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	116		87
Receivables	(167)		58
Inventory	268		43
Other current assets	(643)		199
Increase (decrease) in
Accounts payable	(146)		(563)
Taxes accrued	431		386
Other current liabilities	10		(284)
Other assets	199		(338)
Other liabilities	77		(367)
Net cash provided by operating activities	7,227		6,766
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(7,089)		(7,408)
Contributions to equity method investments	(30)		(276)
Purchases of debt and equity securities	(4,292)		(6,160)
Proceeds from sales and maturities of debt and equity securities	4,335		6,087
Disbursements to canceled equity method investments	(855)		—
Other	(269)		(207)
Net cash used in investing activities	(8,200)		(7,964)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the:
Issuance of long-term debt	6,379		6,162
Issuance of common stock	5		75
Payments for the redemption of long-term debt	(3,696)		(3,468)
Proceeds from the issuance of short-term debt with original maturities greater than 90 days	109		2,372
Payments for the redemption of short-term debt with original maturities greater than 90 days	(997)		(1,143)
Notes payable and commercial paper	165		(969)
Contributions from noncontrolling interests	1,556		402
Dividends paid	(2,340)		(2,113)
Other	(21)		(93)
Net cash provided by financing activities	1,160		1,225
Net increase in cash, cash equivalents and restricted cash	187		27
Cash, cash equivalents and restricted cash at beginning of period	556		573
Cash, cash equivalents and restricted cash at end of period	$	743	$	600
Supplemental Disclosures:
Significant non-cash transactions:
Accrued capital expenditures	$	998	$	992
Non-cash dividends	—		82

See Notes to Condensed Consolidated Financial Statements

12

FINANCIAL STATEMENTS

DUKE ENERGY CORPORATION

Condensed Consolidated Statements of Changes in Equity

(Unaudited)

	Three Months Ended September 30, 2020 and 2021
											Accumulated Other Comprehensive
											(Loss) Income
													Net Unrealized				Total
											Net Gains		(Losses) Gains				Duke Energy
			Common				Additional				(Losses) on		on Available-		Pension and		Corporation
	Preferred		Stock		Common		Paid-in		Retained		Cash Flow		for-Sale-		OPEB		Stockholders'		Noncontrolling		Total
(in millions)	Stock		Shares		Stock		Capital		Earnings		Hedges		Securities		Adjustments		Equity		Interests		Equity
Balance at June 30, 2020	$	1,962	735		$	1	$	40,997	$	2,707	$	(111)	$	10	$	(82)	$	45,484	$	1,127	$	46,611
Net income (loss)	—		—		—		—		1,265		—		—		—		1,265		(70)		1,195
Other comprehensive (loss) income	—		—		—		—		—		(79)		(2)		1		(80)		—		(80)
Common stock issuances, including dividend reinvestment and employee benefits	—		1		—		65		—		—		—		—		65		—		65
Common stock dividends	—		—		—		—		(712)		—		—		—		(712)		—		(712)
Contribution from noncontrolling interests, net of transaction costs(a)	—		—		—		(17)		—		—		—		—		(17)		239		222
Distributions to noncontrolling interest in subsidiaries	—		—		—		—		—		—		—		—		—		(8)		(8)
Other	—		—		—		1		—		—		—		—		1		1		2
Balance at September 30, 2020	$	1,962	$	736	$	1	$	41,046	$	3,260	$	(190)	$	8	$	(81)	$	46,006	$	1,289	$	47,295
Balance at June 30, 2021	$	1,962	769		$	1	$	43,788	$	2,687	$	(234)	$	2	$	(74)	$	48,132	$	1,413	$	49,545
Net income (loss)	—		—		—		—		1,366		—		—		—		1,366		(129)		1,237
Other comprehensive income (loss)	—		—		—		—		—		10		(2)		1		9		1		10
Common stock issuances, including dividend reinvestment and employee benefits	—		—		—		20		—		—		—		—		20		—		20
Common stock dividends	—		—		—		—		(760)		—		—		—		(760)		—		(760)
Sale of noncontrolling interest(c)	—		—		—		545		—		—		—		—		545		454		999
Contribution from noncontrolling interests, net of transaction costs(a)	—		—		—		(3)		—		—		—		—		(3)		213		210
Distributions to noncontrolling interest in subsidiaries	—		—		—		—		—		—		—		—		—		(22)		(22)
Other	—		—		—		(2)		—		—		—		—		(2)		3		1
Balance at September 30, 2021	$	1,962	$	769	$	1	$	44,348	$	3,293	$	(224)	$	—	$	(73)	$	49,307	$	1,933	$	51,240

See Notes to Condensed Consolidated Financial Statements

13

FINANCIAL STATEMENTS

DUKE ENERGY CORPORATION

Condensed Consolidated Statements of Changes in Equity

(Unaudited)

	Nine Months Ended September 30, 2020 and 2021
										Accumulated Other Comprehensive
										(Loss) Income
												Net Unrealized				Total
										Net Gains		Gains (Losses)				Duke Energy
			Common			Additional				(Losses) on		on Available-		Pension and		Corporation
	Preferred		Stock	Common		Paid-in		Retained		Cash Flow		for-Sale-		OPEB		Stockholders'		Noncontrolling		Total
(in millions)	Stock		Shares	Stock		Capital		Earnings		Hedges		Securities		Adjustments		Equity		Interests		Equity
Balance at December 31, 2019	$	1,962	733	$	1	$	40,881	$	4,108	$	(51)	$	3	$	(82)	$	46,822	$	1,129	$	47,951
Net income (loss)	—		—	—		—		1,347		—		—		—		1,347		(208)		1,139
Other comprehensive (loss) income	—		—	—		—		—		(139)		5		1		(133)		(12)		(145)
Common stock issuances, including dividend reinvestment and employee benefits	—		3	—		181		—		—		—		—		181		—		181
Common stock dividends	—		—	—		—		(2,103)		—		—		—		(2,103)		—		(2,103)
Contributions from noncontrolling interests, net of transaction costs(a)	—		—	—		(17)		—		—		—		—		(17)		402		385
Distributions to noncontrolling interest in subsidiaries	—		—	—		—		—		—		—		—		—		(22)		(22)
Other(b)	—		—	—		1		(92)		—		—		—		(91)		—		(91)
Balance at September 30, 2020	$	1,962	736	$	1	$	41,046	$	3,260	$	(190)	$	8	$	(81)	$	46,006	$	1,289	$	47,295
Balance at December 31, 2020	$	1,962	769	$	1	$	43,767	$	2,471	$	(167)	$	6	$	(76)	$	47,964	$	1,220	$	49,184
Net income (loss)	—		—	—		—		3,070		—		—		—		3,070		(247)		2,823
Other comprehensive (loss) income	—		—	—		—		—		(57)		(6)		3		(60)		7		(53)
Common stock issuances, including dividend reinvestment and employee benefits	—		—	—		43		—		—		—		—		43		—		43
Common stock dividends	—		—	—		—		(2,248)		—		—		—		(2,248)		—		(2,248)
Sale of noncontrolling interest(c)	—		—	—		545		—		—		—		—		545		454		999
Contributions from noncontrolling interests, net of transaction costs(a)	—		—	—		(6)		—		—		—		—		(6)		531		525
Distributions to noncontrolling interest in subsidiaries	—		—	—		—		—		—		—		—		—		(34)		(34)
Other	—		—	—		(1)		—		—		—		—		(1)		2		1
Balance at September 30, 2021	$	1,962	769	$	1	$	44,348	$	3,293	$	(224)	$	—	$	(73)	$	49,307	$	1,933	$	51,240

(a)Relates to tax equity financing activity in the Commercial Renewables segment.

(b)Amounts in Retained earnings primarily represent impacts due to implementation of a new accounting standard related to Current Estimated Credit Losses. See Note 1 for additional discussion.

(c)Relates to the sale of a noncontrolling interest in Duke Energy Indiana. See Note 2 for additional discussion.

See Notes to Condensed Consolidated Financial Statements

14

FINANCIAL STATEMENTS

DUKE ENERGY CAROLINAS, LLC

Condensed Consolidated Statements of Operations and Comprehensive Income

(Unaudited)

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in millions)	2021		2020		2021		2020
Operating Revenues	$	2,104	$	2,058	$	5,430	$	5,416
Operating Expenses
Fuel used in electric generation and purchased power	452		497		1,218		1,326
Operation, maintenance and other	471		402		1,347		1,218
Depreciation and amortization	366		372		1,088		1,090
Property and other taxes	91		57		248		213
Impairment of assets and other charges	163		20		238		22
Total operating expenses	1,543		1,348		4,139		3,869
(Losses) Gains on Sales of Other Assets and Other, net	(1)		1		1		1
Operating Income	560		711		1,292		1,548
Other Income and Expenses, net	126		42		218		128
Interest Expense	137		122		400		370
Income Before Income Taxes	549		631		1,110		1,306
Income Tax Expense	16		76		40		178
Net Income and Comprehensive Income	$	533	$	555	$	1,070	$	1,128

See Notes to Condensed Consolidated Financial Statements

15

FINANCIAL STATEMENTS

DUKE ENERGY CAROLINAS, LLC

Condensed Consolidated Balance Sheets

(Unaudited)

(in millions)	September 30, 2021		December 31, 2020
ASSETS
Current Assets
Cash and cash equivalents	$	21	$	21
Receivables (net of allowance for doubtful accounts of $2 at 2021 and $1 at 2020)	278		247
Receivables of VIEs (net of allowance for doubtful accounts of $40 at 2021 and $22 at 2020)	915		696
Receivables from affiliated companies	85		124
Inventory	969		1,010
Regulatory assets	460		473
Other	104		20
Total current assets	2,832		2,591
Property, Plant and Equipment
Cost	51,790		50,640
Accumulated depreciation and amortization	(17,959)		(17,453)
Facilities to be retired, net	89		—
Net property, plant and equipment	33,920		33,187
Other Noncurrent Assets
Regulatory assets	2,743		2,996
Nuclear decommissioning trust funds	5,434		4,977
Operating lease right-of-use assets, net	95		110
Other	1,197		1,187
Total other noncurrent assets	9,469		9,270
Total Assets	$	46,221	$	45,048
LIABILITIES AND EQUITY
Current Liabilities
Accounts payable	$	673	$	1,000
Accounts payable to affiliated companies	184		199
Notes payable to affiliated companies	86		506
Taxes accrued	391		76
Interest accrued	137		117
Current maturities of long-term debt	357		506
Asset retirement obligations	245		264
Regulatory liabilities	503		473
Other	516		546
Total current liabilities	3,092		3,687
Long-Term Debt	12,318		11,412
Long-Term Debt Payable to Affiliated Companies	300		300
Other Noncurrent Liabilities
Deferred income taxes	3,893		3,842
Asset retirement obligations	5,134		5,086
Regulatory liabilities	6,867		6,535
Operating lease liabilities	83		97
Accrued pension and other post-retirement benefit costs	64		73
Investment tax credits	288		236
Other	558		626
Total other noncurrent liabilities	16,887		16,495
Commitments and Contingencies
Equity
Member's equity	13,631		13,161
Accumulated other comprehensive loss	(7)		(7)
Total equity	13,624		13,154
Total Liabilities and Equity	$	46,221	$	45,048

See Notes to Condensed Consolidated Financial Statements

16

FINANCIAL STATEMENTS

DUKE ENERGY CAROLINAS, LLC

Condensed Consolidated Statements of Cash Flows

(Unaudited)

	Nine Months Ended
	September 30,
(in millions)	2021		2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$	1,070	$	1,128
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization (including amortization of nuclear fuel)	1,295		1,295
Equity component of AFUDC	(46)		(46)
Loss on sales of other assets	(1)		—
Impairment of assets and other charges	238		22
Deferred income taxes	(146)		(103)
Payments for asset retirement obligations	(132)		(127)
Provision for rate refunds	(29)		(1)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(1)		—
Receivables	(172)		41
Receivables from affiliated companies	39		50
Inventory	41		4
Other current assets	(153)		197
Increase (decrease) in
Accounts payable	(254)		(313)
Accounts payable to affiliated companies	(15)		(55)
Taxes accrued	315		352
Other current liabilities	72		(121)
Other assets	52		(72)
Other liabilities	167		(23)
Net cash provided by operating activities	2,340		2,228
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,947)		(1,931)
Purchases of debt and equity securities	(2,465)		(1,313)
Proceeds from sales and maturities of debt and equity securities	2,465		1,313
Notes receivable from affiliated companies	—		(65)
Other	(122)		(105)
Net cash used in investing activities	(2,069)		(2,101)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,367		965
Payments for the redemption of long-term debt	(616)		(457)
Notes payable to affiliated companies	(421)		(29)
Distributions to parent	(600)		(600)
Other	(1)		(1)
Net cash used in financing activities	(271)		(122)
Net increase in cash and cash equivalents	—		5
Cash and cash equivalents at beginning of period	21		18
Cash and cash equivalents at end of period	$	21	$	23
Supplemental Disclosures:
Significant non-cash transactions:
Accrued capital expenditures	$	308	$	295

See Notes to Condensed Consolidated Financial Statements

17

FINANCIAL STATEMENTS

DUKE ENERGY CAROLINAS, LLC

Condensed Consolidated Statements of Changes in Equity

(Unaudited)

	Three Months Ended September 30, 2020 and 2021
			Accumulated Other
			Comprehensive
			Loss
	Member's		Net Losses on		Total
(in millions)	Equity		Cash Flow Hedges		Equity
Balance at June 30, 2020	$	13,079	$	(7)	$	13,072
Net income	555		—		555
Distributions to parent	(300)		—		(300)
Other	(1)		—		(1)
Balance at September 30, 2020	$	13,333	$	(7)	$	13,326
Balance at June 30, 2021	$	13,399	$	(7)	$	13,392
Net income	533		—		533
Distributions to parent	(300)		—		(300)
Other	(1)		—		(1)
Balance at September 30, 2021	$	13,631	$	(7)	$	13,624
	Nine Months Ended September 30, 2020 and 2021
			Accumulated Other
			Comprehensive
			Loss
	Member's		Net Losses on		Total
(in millions)	Equity		Cash Flow Hedges		Equity
Balance at December 31, 2019	$	12,818	$	(7)	$	12,811
Net income	1,128		—		1,128
Distributions to parent	(600)		—		(600)
Other(a)	(13)		—		(13)
Balance at September 30, 2020	$	13,333	$	(7)	$	13,326
Balance at December 31, 2020	$	13,161	$	(7)	$	13,154
Net income	1,070		—		1,070
Distributions to parent	(600)		—		(600)
Balance at September 30, 2021	$	13,631	$	(7)	$	13,624

(a)Amounts primarily represent impacts due to implementation of a new accounting standard related to Current Estimated Credit Losses. See Note 1 for additional discussion.

See Notes to Condensed Consolidated Financial Statements

18

FINANCIAL STATEMENTS

PROGRESS ENERGY, INC.

Condensed Consolidated Statements of Operations and Comprehensive Income

(Unaudited)

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in millions)	2021		2020		2021		2020
Operating Revenues	$	3,233	$	3,197	$	8,417	$	8,117
Operating Expenses
Fuel used in electric generation and purchased power	1,074		1,088		2,702		2,628
Operation, maintenance and other	636		646		1,863		1,789
Depreciation and amortization	504		472		1,430		1,356
Property and other taxes	144		147		419		419
Impairment of assets and other charges	42		1		79		1
Total operating expenses	2,400		2,354		6,493		6,193
Gains on Sales of Other Assets and Other, net	8		3		9		9
Operating Income	841		846		1,933		1,933
Other Income and Expenses, net	86		24		167		89
Interest Expense	200		194		592		599
Income Before Income Taxes	727		676		1,508		1,423
Income Tax Expense	94		70		174		190
Net Income	633		606		$	1,334	$	1,233
Less: Net Income Attributable to Noncontrolling Interests	1		1		1		1
Net Income Attributable to Parent	$	632	$	605	$	1,333	$	1,232
Net Income	$	633	$	606	$	1,334	$	1,233
Other Comprehensive Income, net of tax
Pension and OPEB adjustments	(1)		—		—		1
Net unrealized gains on cash flow hedges	1		1		2		3
Unrealized gains on available-for-sale securities	—		1		—		1
Other Comprehensive Income, net of tax	—		2		2		5
Comprehensive Income	633		608		$	1,336	$	1,238
Less: Comprehensive Income Attributable to Noncontrolling Interests	1		1		1		1
Comprehensive Income Attributable to Parent	$	632	$	607	$	1,335	$	1,237

See Notes to Condensed Consolidated Financial Statements

19

FINANCIAL STATEMENTS

PROGRESS ENERGY, INC.

Condensed Consolidated Balance Sheets

(Unaudited)

(in millions)	September 30, 2021		December 31, 2020
ASSETS
Current Assets
Cash and cash equivalents	$	102	$	59
Receivables (net of allowance for doubtful accounts of $11 at 2021 and $8 at 2020)	268		228
Receivables of VIEs (net of allowance for doubtful accounts of $25 at 2021 and $29 at 2020)	981		901
Receivables from affiliated companies	61		157
Inventory	1,255		1,375
Regulatory assets (includes $54 at 2021 and $53 at 2020 related to VIEs)	864		758
Other (includes $17 at 2021 and $39 at 2020 related to VIEs)	178		109
Total current assets	3,709		3,587
Property, Plant and Equipment
Cost	59,976		57,892
Accumulated depreciation and amortization	(19,211)		(18,368)
Facilities to be retired, net	27		29
Net property, plant and equipment	40,792		39,553
Other Noncurrent Assets
Goodwill	3,655		3,655
Regulatory assets (includes $896 at 2021 and $937 at 2020 related to VIEs)	5,785		5,775
Nuclear decommissioning trust funds	4,427		4,137
Operating lease right-of-use assets, net	714		690
Other	1,175		1,227
Total other noncurrent assets	15,756		15,484
Total Assets	$	60,257	$	58,624
LIABILITIES AND EQUITY
Current Liabilities
Accounts payable	$	898	$	919
Accounts payable to affiliated companies	221		289
Notes payable to affiliated companies	3,123		2,969
Taxes accrued	284		121
Interest accrued	175		202
Current maturities of long-term debt (includes $56 at 2021 and $305 at 2020 related to VIEs)	1,932		1,426
Asset retirement obligations	234		283
Regulatory liabilities	541		640
Other	856		793
Total current liabilities	8,264		7,642
Long-Term Debt (includes $1,546 at 2021 and $1,252 at 2020 related to VIEs)	17,406		17,688
Long-Term Debt Payable to Affiliated Companies	150		150
Other Noncurrent Liabilities
Deferred income taxes	4,784		4,396
Asset retirement obligations	5,850		5,866
Regulatory liabilities	5,335		5,051
Operating lease liabilities	623		623
Accrued pension and other post-retirement benefit costs	490		505
Other	473		462
Total other noncurrent liabilities	17,555		16,903
Commitments and Contingencies
Equity
Common Stock, $0.01 par value, 100 shares authorized and outstanding at 2021 and 2020	—		—
Additional paid-in capital	9,149		9,143
Retained earnings	7,743		7,109
Accumulated other comprehensive loss	(13)		(15)
Total Progress Energy, Inc. stockholders' equity	16,879		16,237
Noncontrolling interests	3		4
Total equity	16,882		16,241
Total Liabilities and Equity	$	60,257	$	58,624

See Notes to Condensed Consolidated Financial Statements

20

FINANCIAL STATEMENTS

PROGRESS ENERGY, INC.

Condensed Consolidated Statements of Cash Flows

(Unaudited)

	Nine Months Ended
	September 30,
(in millions)	2021		2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$	1,334	$	1,233
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,707		1,734
Equity component of AFUDC	(37)		(30)
Impairment of assets and other charges	79		1
Deferred income taxes	235		(3)
Payments for asset retirement obligations	(206)		(287)
Provision for rate refunds	(22)		4
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	117		(13)
Receivables	(123)		(207)
Receivables from affiliated companies	96		32
Inventory	120		46
Other current assets	(347)		214
Increase (decrease) in
Accounts payable	79		(124)
Accounts payable to affiliated companies	(68)		(102)
Taxes accrued	161		263
Other current liabilities	(36)		(41)
Other assets	(3)		(154)
Other liabilities	(139)		(102)
Net cash provided by operating activities	2,947		2,464
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(2,628)		(2,602)
Purchases of debt and equity securities	(1,583)		(4,554)
Proceeds from sales and maturities of debt and equity securities	1,649		4,543
Notes receivable from affiliated companies	—		164
Other	(131)		(114)
Net cash used in investing activities	(2,693)		(2,563)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,190		1,791
Payments for the redemption of long-term debt	(977)		(1,555)
Notes payable to affiliated companies	154		338
Dividends to parent	(700)		(400)
Other	(2)		(13)
Net cash (used in) provided by financing activities	(335)		161
Net (decrease) increase in cash, cash equivalents and restricted cash	(81)		62
Cash, cash equivalents and restricted cash at beginning of period	200		126
Cash, cash equivalents and restricted cash at end of period	$	119	$	188
Supplemental Disclosures:
Significant non-cash transactions:
Accrued capital expenditures	$	290	$	311

See Notes to Condensed Consolidated Financial Statements

21

FINANCIAL STATEMENTS

PROGRESS ENERGY, INC.

Condensed Consolidated Statements of Changes in Equity

(Unaudited)

	Three Months Ended September 30, 2020 and 2021
					Accumulated Other Comprehensive Loss
					Net Gains		Net Unrealized				Total Progress
	Additional				(Losses) on		Gains (Losses) on		Pension and		Energy, Inc.
	Paid-in		Retained		Cash Flow		Available-for-		OPEB		Stockholders'		Noncontrolling		Total
(in millions)	Capital		Earnings		Hedges		Sale Securities		Adjustments		Equity		Interests		Equity
Balance at June 30, 2020	$	9,143	$	7,090	$	(8)	$	(1)	$	(6)	$	16,218	$	3	$	16,221
Net income	—		605		—		—		—		605		1		606
Other comprehensive income	—		—		1		1		—		2		—		2
Dividends to parent	—		(400)		—		—		—		(400)		—		(400)
Other	—		1		—		—		—		1		(1)		—
Balance at September 30, 2020	$	9,143	$	7,296	$	(7)	$	—	$	(6)	$	16,426	$	3	$	16,429
Balance at June 30, 2021	$	9,143	$	7,809	$	(4)	$	(2)	$	(7)	$	16,939	$	3	$	16,942
Net income	—		632		—		—		—		632		1		633
Other comprehensive income (loss)	—		—		1		—		(1)		—		—		—
Dividends to parent	—		(700)		—		—		—		(700)		—		(700)
Other	6		2		—		—		—		8		(1)		7
Balance at September 30, 2021	$	9,149	$	7,743	$	(3)	$	(2)	$	(8)	$	16,879	$	3	$	16,882
	Nine Months Ended September 30, 2020 and 2021
					Accumulated Other Comprehensive Loss
					Net Gains		Net Unrealized				Total Progress
	Additional				(Losses) on		Gains (Losses) on		Pension and		Energy, Inc.
	Paid-in		Retained		Cash Flow		Available-for-		OPEB		Stockholders'		Noncontrolling		Total
	Capital		Earnings		Hedges		Sale Securities		Adjustments		Equity		Interests		Equity
Balance at December 31, 2019	$	9,143	$	6,465	$	(10)	$	(1)	$	(7)	$	15,590	$	3	$	15,593
Net income	—		1,232		—		—		—		1,232		1		1,233
Other comprehensive income	—		—		3		1		1		5		—		5
Distributions to noncontrolling interests	—		—		—		—		—		—		(1)		(1)
Dividends to parent	—		(400)		—		—		—		(400)		—		(400)
Other	—		(1)		—		—		—		(1)		—		(1)
Balance at September 30, 2020	$	9,143	$	7,296	$	(7)	$	—	$	(6)	$	16,426	$	3	$	16,429
Balance at December 31, 2020	$	9,143	$	7,109	$	(5)	$	(2)	$	(8)	$	16,237	$	4	$	16,241
Net income	—		1,333		—		—		—		1,333		1		1,334
Other comprehensive income	—		—		2		—		—		2		—		2
Distributions to noncontrolling interests	—		—		—		—		—		—		(1)		(1)
Dividends to parent	—		(700)		—		—		—		(700)		—		(700)
Other	6		1		—		—		—		7		(1)		6
Balance at September 30, 2021	$	9,149	$	7,743	$	(3)	$	(2)	$	(8)	$	16,879	$	3	$	16,882

See Notes to Condensed Consolidated Financial Statements

22

FINANCIAL STATEMENTS

DUKE ENERGY PROGRESS, LLC

Condensed Consolidated Statements of Operations and Comprehensive Income

(Unaudited)

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in millions)	2021		2020		2021		2020
Operating Revenues	$	1,667	$	1,626	$	4,417	$	4,207
Operating Expenses
Fuel used in electric generation and purchased power	523		537		1,368		1,337
Operation, maintenance and other	368		348		1,092		970
Depreciation and amortization	290		289		811		833
Property and other taxes	39		38		129		129
Impairment of assets and other charges	42		5		60		5
Total operating expenses	1,262		1,217		3,460		3,274
Gains on Sales of Other Assets and Other, net	7		3		8		8
Operating Income	412		412		965		941
Other Income and Expenses, net	67		11		111		52
Interest Expense	79		66		226		203
Income Before Income Taxes	400		357		850		790
Income Tax Expense	25		11		50		79
Net Income and Comprehensive Income	$	375	$	346	$	800	$	711

See Notes to Condensed Consolidated Financial Statements

23

FINANCIAL STATEMENTS

DUKE ENERGY PROGRESS, LLC

Condensed Consolidated Balance Sheets

(Unaudited)

(in millions)	September 30, 2021		December 31, 2020
ASSETS
Current Assets
Cash and cash equivalents	$	51	$	39
Receivables (net of allowance for doubtful accounts of $4 at 2021 and 2020)	162		132
Receivables of VIEs (net of allowance for doubtful accounts of $17 at 2021 and $19 at 2020)	532		500
Receivables from affiliated companies	68		50
Inventory	815		911
Regulatory assets	499		492
Other	116		60
Total current assets	2,243		2,184
Property, Plant and Equipment
Cost	36,666		35,759
Accumulated depreciation and amortization	(13,365)		(12,801)
Facilities to be retired, net	27		29
Net property, plant and equipment	23,328		22,987
Other Noncurrent Assets
Regulatory assets	3,955		3,976
Nuclear decommissioning trust funds	3,857		3,500
Operating lease right-of-use assets, net	402		346
Other	772		740
Total other noncurrent assets	8,986		8,562
Total Assets	$	34,557	$	33,733
LIABILITIES AND EQUITY
Current Liabilities
Accounts payable	$	392	$	454
Accounts payable to affiliated companies	113		215
Notes payable to affiliated companies	117		295
Taxes accrued	163		85
Interest accrued	68		99
Current maturities of long-term debt	1,207		603
Asset retirement obligations	234		283
Regulatory liabilities	439		530
Other	442		411
Total current liabilities	3,175		2,975
Long-Term Debt	8,491		8,505
Long-Term Debt Payable to Affiliated Companies	150		150
Other Noncurrent Liabilities
Deferred income taxes	2,488		2,298
Asset retirement obligations	5,407		5,352
Regulatory liabilities	4,685		4,394
Operating lease liabilities	359		323
Accrued pension and other post-retirement benefit costs	234		242
Investment tax credits	129		132
Other	79		102
Total other noncurrent liabilities	13,381		12,843
Commitments and Contingencies
Equity
Member's Equity	9,360		9,260
Total Liabilities and Equity	$	34,557	$	33,733

See Notes to Condensed Consolidated Financial Statements

24

FINANCIAL STATEMENTS

DUKE ENERGY PROGRESS, LLC

Condensed Consolidated Statements of Cash Flows

(Unaudited)

	Nine Months Ended
	September 30,
(in millions)	2021		2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$	800	$	711
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization (including amortization of nuclear fuel)	951		972
Equity component of AFUDC	(25)		(22)
Impairment of assets and other charges	60		5
Deferred income taxes	22		(33)
Payments for asset retirement obligations	(129)		(249)
Provision for rate refunds	(22)		4
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	108		—
Receivables	(66)		(34)
Receivables from affiliated companies	(18)		7
Inventory	95		24
Other current assets	(79)		82
Increase (decrease) in
Accounts payable	20		(185)
Accounts payable to affiliated companies	(102)		(59)
Taxes accrued	75		190
Other current liabilities	(36)		(24)
Other assets	48		(185)
Other liabilities	(32)		21
Net cash provided by operating activities	1,670		1,225
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,313)		(1,142)
Purchases of debt and equity securities	(1,306)		(1,269)
Proceeds from sales and maturities of debt and equity securities	1,291		1,238
Other	(36)		(31)
Net cash used in investing activities	(1,364)		(1,204)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,190		1,296
Payments for the redemption of long-term debt	(605)		(985)
Notes payable to affiliated companies	(178)		101
Distributions to parent	(700)		(400)
Other	(1)		(12)
Net cash used in financing activities	(294)		—
Net increase in cash and cash equivalents	12		21
Cash and cash equivalents at beginning of period	39		22
Cash and cash equivalents at end of period	$	51	$	43
Supplemental Disclosures:
Significant non-cash transactions:
Accrued capital expenditures	$	82	$	124

See Notes to Condensed Consolidated Financial Statements

25

FINANCIAL STATEMENTS

DUKE ENERGY PROGRESS, LLC

Condensed Consolidated Statements of Changes in Equity

(Unaudited)

	Three Months Ended
	September 30, 2020 and 2021
(in millions)	Member's Equity
Balance at June 30, 2020	$	9,610
Net income	346
Distributions to parent	(400)
Balance at September 30, 2020	$	9,556
Balance at June 30, 2021	$	9,685
Net income	375
Distributions to parent	(700)
Balance at September 30, 2021	$	9,360
	Nine Months Ended
	September 30, 2020 and 2021
(in millions)	Member's Equity
Balance at December 31, 2019	$	9,246
Net income	711
Distributions to parent	(400)
Other	(1)
Balance at September 30, 2020	$	9,556
Balance at December 31, 2020	$	9,260
Net income	800
Distributions to parent	(700)
Balance at September 30, 2021	$	9,360

See Notes to Condensed Consolidated Financial Statements

26

FINANCIAL STATEMENTS

DUKE ENERGY FLORIDA, LLC

Condensed Consolidated Statements of Operations and Comprehensive Income

(Unaudited)

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in millions)	2021		2020		2021		2020
Operating Revenues	$	1,561	$	1,567	$	3,987	$	3,897
Operating Expenses
Fuel used in electric generation and purchased power	552		551		1,335		1,291
Operation, maintenance and other	263		292		760		806
Depreciation and amortization	214		183		619		523
Property and other taxes	105		110		290		290
Impairment of assets and other charges	—		(4)		19		(4)
Total operating expenses	1,134		1,132		3,023		2,906
Gains on Sales of Other Assets and Other, net	1		—		1		—
Operating Income	428		435		965		991
Other Income and Expenses, net	18		11		54		36
Interest Expense	79		81		239		245
Income Before Income Taxes	367		365		780		782
Income Tax Expense	70		78		149		159
Net Income	$	297	$	287	$	631	$	623
Other Comprehensive Income, net of tax
Unrealized gains on available-for-sale securities	—		1		—		1
Comprehensive Income	$	297	$	288	$	631	$	624

See Notes to Condensed Consolidated Financial Statements

27

FINANCIAL STATEMENTS

DUKE ENERGY FLORIDA, LLC

Condensed Consolidated Balance Sheets

(Unaudited)

(in millions)	September 30, 2021		December 31, 2020
ASSETS
Current Assets
Cash and cash equivalents	$	40	$	11
Receivables (net of allowance for doubtful accounts of $8 at 2021 and $4 at 2020)	104		94
Receivables of VIEs (net of allowance for doubtful accounts of $8 at 2021 and $10 at 2020)	449		401
Receivables from affiliated companies	3		3
Inventory	439		464
Regulatory assets (includes $54 at 2021 and $53 at 2020 related to VIEs)	365		265
Other (includes $17 at 2021 and $39 at 2020 related to VIEs)	35		41
Total current assets	1,435		1,279
Property, Plant and Equipment
Cost	23,300		22,123
Accumulated depreciation and amortization	(5,839)		(5,560)
Net property, plant and equipment	17,461		16,563
Other Noncurrent Assets
Regulatory assets (includes $896 at 2021 and $937 at 2020 related to VIEs)	1,829		1,799
Nuclear decommissioning trust funds	570		637
Operating lease right-of-use assets, net	312		344
Other	351		335
Total other noncurrent assets	3,062		3,115
Total Assets	$	21,958	$	20,957
LIABILITIES AND EQUITY
Current Liabilities
Accounts payable	$	506	$	465
Accounts payable to affiliated companies	129		85
Notes payable to affiliated companies	603		196
Taxes accrued	177		82
Interest accrued	72		69
Current maturities of long-term debt (includes $56 at 2021 and $305 at 2020 related to VIEs)	276		823
Regulatory liabilities	102		110
Other	403		374
Total current liabilities	2,268		2,204
Long-Term Debt (includes $1,196 at 2021 and $1,002 at 2020 related to VIEs)	7,273		7,092
Other Noncurrent Liabilities
Deferred income taxes	2,382		2,191
Asset retirement obligations	443		514
Regulatory liabilities	649		658
Operating lease liabilities	265		300
Accrued pension and other post-retirement benefit costs	225		231
Other	265		209
Total other noncurrent liabilities	4,229		4,103
Commitments and Contingencies
Equity
Member's equity	8,190		7,560
Accumulated other comprehensive loss	(2)		(2)
Total equity	8,188		7,558
Total Liabilities and Equity	$	21,958	$	20,957

See Notes to Condensed Consolidated Financial Statements

28

FINANCIAL STATEMENTS

DUKE ENERGY FLORIDA, LLC

Condensed Consolidated Statements of Cash Flows

(Unaudited)

	Nine Months Ended
	September 30,
(in millions)	2021		2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$	631	$	623
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	752		755
Equity component of AFUDC	(12)		(8)
Impairment of assets and other charges	19		(4)
Deferred income taxes	207		19
Payments for asset retirement obligations	(77)		(38)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	7		(17)
Receivables	(57)		(172)
Receivables from affiliated companies	—		(3)
Inventory	25		22
Other current assets	(247)		41
Increase (decrease) in
Accounts payable	59		63
Accounts payable to affiliated companies	44		(54)
Taxes accrued	95		217
Other current liabilities	(5)		(20)
Other assets	(46)		48
Other liabilities	(94)		(136)
Net cash provided by operating activities	1,301		1,336
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,316)		(1,460)
Purchases of debt and equity securities	(277)		(3,284)
Proceeds from sales and maturities of debt and equity securities	358		3,305
Notes receivable from affiliated companies	—		173
Other	(95)		(82)
Net cash used in investing activities	(1,330)		(1,348)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	—		495
Payments for the redemption of long-term debt	(372)		(570)
Notes payable to affiliated companies	408		66
Net cash provided by (used in) financing activities	36		(9)
Net increase (decrease) in cash, cash equivalents and restricted cash	7		(21)
Cash, cash equivalents and restricted cash at beginning of period	50		56
Cash, cash equivalents and restricted cash at end of period	$	57	$	35
Supplemental Disclosures:
Significant non-cash transactions:
Accrued capital expenditures	$	208	$	187

See Notes to Condensed Consolidated Financial Statements

29

FINANCIAL STATEMENTS

DUKE ENERGY FLORIDA, LLC

Condensed Consolidated Statements of Changes in Equity

(Unaudited)

	Three Months Ended September 30, 2020 and 2021
			Accumulated
			Other
			Comprehensive
			Income (Loss)
			Net Unrealized
			Losses on
	Member's		Available-for-Sale		Total
(in millions)	Equity		Securities		Equity
Balance at June 30, 2020	$	7,125	$	(1)	$	7,124
Net income	287		—		287
Other comprehensive income	—		1		1
Other	(1)		—		(1)
Balance at September 30, 2020	$	7,411	$	—	$	7,411
Balance at June 30, 2021	$	7,893	$	(2)	$	7,891
Net income	297		—		297
Balance at September 30, 2021	$	8,190	$	(2)	$	8,188
	Nine Months Ended September 30, 2020 and 2021
			Accumulated
			Other
			Comprehensive
			Income (Loss)
			Net Unrealized
			Losses on
	Member's		Available-for-Sale		Total
(in millions)	Equity		Securities		Equity
Balance at December 31, 2019	$	6,789	$	(1)	$	6,788
Net income	623		—		623
Other comprehensive income	—		1		1
Other	(1)		—		(1)
Balance at September 30, 2020	$	7,411	$	—	$	7,411
Balance at December 31, 2020	$	7,560	$	(2)	$	7,558
Net income	631		—		631
Other	(1)		—		(1)
Balance at September 30, 2021	$	8,190	$	(2)	$	8,188

See Notes to Condensed Consolidated Financial Statements

30

FINANCIAL STATEMENTS

DUKE ENERGY OHIO, INC.

Condensed Consolidated Statements of Operations and Comprehensive Income

(Unaudited)

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in millions)	2021		2020		2021		2020
Operating Revenues
Regulated electric	$	413	$	394	$	1,119	$	1,070
Regulated natural gas	93		79		375		324
Total operating revenues	506		473		1,494		1,394
Operating Expenses
Fuel used in electric generation and purchased power	119		94		294		258
Cost of natural gas	9		3		76		46
Operation, maintenance and other	116		115		335		333
Depreciation and amortization	79		72		228		208
Property and other taxes	91		83		266		244
Impairment of assets and other charges	—		—		5		—
Total operating expenses	414		367		1,204		1,089
Operating Income	92		106		290		305
Other Income and Expenses, net	4		4		14		11
Interest Expense	29		26		82		75
Income Before Income Taxes	67		84		222		241
Income Tax Expense	9		14		34		40
Net Income and Comprehensive Income	$	58	$	70	$	188	$	201

See Notes to Condensed Consolidated Financial Statements

31

FINANCIAL STATEMENTS

DUKE ENERGY OHIO, INC.

Condensed Consolidated Balance Sheets

(Unaudited)

(in millions)	September 30, 2021		December 31, 2020
ASSETS
Current Assets
Cash and cash equivalents	$	16	$	14
Receivables (net of allowance for doubtful accounts of $4 at 2021 and 2020)	107		98
Receivables from affiliated companies	77		102
Inventory	114		110
Regulatory assets	61		39
Other	45		31
Total current assets	420		394
Property, Plant and Equipment
Cost	11,531		11,022
Accumulated depreciation and amortization	(3,102)		(3,013)
Net property, plant and equipment	8,429		8,009
Other Noncurrent Assets
Goodwill	920		920
Regulatory assets	634		610
Operating lease right-of-use assets, net	19		20
Other	83		72
Total other noncurrent assets	1,656		1,622
Total Assets	$	10,505	$	10,025
LIABILITIES AND EQUITY
Current Liabilities
Accounts payable	$	304	$	279
Accounts payable to affiliated companies	59		68
Notes payable to affiliated companies	451		169
Taxes accrued	210		247
Interest accrued	32		31
Current maturities of long-term debt	50		50
Asset retirement obligations	17		3
Regulatory liabilities	63		65
Other	68		70
Total current liabilities	1,254		982
Long-Term Debt	3,017		3,014
Long-Term Debt Payable to Affiliated Companies	25		25
Other Noncurrent Liabilities
Deferred income taxes	1,032		981
Asset retirement obligations	95		108
Regulatory liabilities	734		748
Operating lease liabilities	19		20
Accrued pension and other post-retirement benefit costs	114		113
Other	92		99
Total other noncurrent liabilities	2,086		2,069
Commitments and Contingencies
Equity
Common Stock, $8.50 par value, 120 million shares authorized; 90 million shares outstanding at 2021 and 2020	762		762
Additional paid-in capital	2,776		2,776
Retained earnings	585		397
Total equity	4,123		3,935
Total Liabilities and Equity	$	10,505	$	10,025

See Notes to Condensed Consolidated Financial Statements

32

FINANCIAL STATEMENTS

DUKE ENERGY OHIO, INC.

Condensed Consolidated Statements of Cash Flows

(Unaudited)

	Nine Months Ended
	September 30,
(in millions)	2021		2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$	188	$	201
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	231		211
Equity component of AFUDC	(5)		(4)
Impairment of assets and other charges	5		—
Deferred income taxes	27		31
Payments for asset retirement obligations	(1)		(1)
Provision for rate refunds	12		10
(Increase) decrease in
Receivables	(9)		(5)
Receivables from affiliated companies	(11)		35
Inventory	(4)		5
Other current assets	(34)		5
Increase (decrease) in
Accounts payable	27		(28)
Accounts payable to affiliated companies	(9)		(14)
Taxes accrued	(37)		(23)
Other current liabilities	(12)		6
Other assets	(35)		(24)
Other liabilities	8		(7)
Net cash provided by operating activities	341		398
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(615)		(611)
Notes receivable from affiliated companies	36		—
Other	(42)		(34)
Net cash used in investing activities	(621)		(645)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	—		467
Notes payable to affiliated companies	282		(227)
Net cash provided by financing activities	282		240
Net increase (decrease) in cash and cash equivalents	2		(7)
Cash and cash equivalents at beginning of period	14		17
Cash and cash equivalents at end of period	$	16	$	10
Supplemental Disclosures:
Significant non-cash transactions:
Accrued capital expenditures	$	103	$	92

See Notes to Condensed Consolidated Financial Statements

33

FINANCIAL STATEMENTS

DUKE ENERGY OHIO, INC.

Condensed Consolidated Statements of Changes in Equity

(Unaudited)

	Three Months Ended September 30, 2020 and 2021
			Additional
	Common		Paid-in		Retained		Total
(in millions)	Stock		Capital		Earnings		Equity
Balance at June 30, 2020	$	762	$	2,776	$	276	$	3,814
Net income	—		—		70		70
Balance at September 30, 2020	$	762	$	2,776	$	346	$	3,884
Balance at June 30, 2021	$	762	$	2,776	$	527	$	4,065
Net income	—		—		58		58
Balance at September 30, 2021	$	762	$	2,776	$	585	$	4,123
	Nine Months Ended September 30, 2020 and 2021
			Additional
	Common		Paid-in		Retained		Total
(in millions)	Stock		Capital		Earnings		Equity
Balance at December 31, 2019	$	762	$	2,776	$	145	$	3,683
Net income	—		—		201		201
Balance at September 30, 2020	$	762	$	2,776	$	346	$	3,884
Balance at December 31, 2020	$	762	$	2,776	$	397	$	3,935
Net income	—		—		188		188
Balance at September 30, 2021	$	762	$	2,776	$	585	$	4,123

See Notes to Condensed Consolidated Financial Statements

34

FINANCIAL STATEMENTS

DUKE ENERGY INDIANA, LLC

Condensed Consolidated Statements of Operations and Comprehensive Income

(Unaudited)

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in millions)	2021		2020		2021		2020
Operating Revenues	$	886	$	761	$	2,366	$	2,070
Operating Expenses
Fuel used in electric generation and purchased power	292		222		710		577
Operation, maintenance and other	173		207		543		564
Depreciation and amortization	154		149		458		415
Property and other taxes	16		15		57		57
Impairment of assets and other charges	—		—		8		—
Total operating expenses	635		593		1,776		1,613
Gains on Sales of Other Assets and Other, net	1		—		—		—
Operating Income	252		168		590		457
Other Income and Expenses, net	12		9		31		28
Interest Expense	49		29		148		114
Income Before Income Taxes	215		148		473		371
Income Tax Expense	34		29		77		72
Net Income and Comprehensive Income	$	181	$	119	$	396	$	299

See Notes to Condensed Consolidated Financial Statements

35

FINANCIAL STATEMENTS

DUKE ENERGY INDIANA, LLC

Condensed Consolidated Balance Sheets

(Unaudited)

(in millions)	September 30, 2021		December 31, 2020
ASSETS
Current Assets
Cash and cash equivalents	$	14	$	7
Receivables (net of allowance for doubtful accounts of $3 at 2021 and 2020)	81		55
Receivables from affiliated companies	62		112
Notes receivable from affiliated companies	252		—
Inventory	367		473
Regulatory assets	196		125
Other	59		37
Total current assets	1,031		809
Property, Plant and Equipment
Cost	17,320		17,382
Accumulated depreciation and amortization	(5,550)		(5,661)
Net property, plant and equipment	11,770		11,721
Other Noncurrent Assets
Regulatory assets	1,300		1,203
Operating lease right-of-use assets, net	51		55
Other	276		253
Total other noncurrent assets	1,627		1,511
Total Assets	$	14,428	$	14,041
LIABILITIES AND EQUITY
Current Liabilities
Accounts payable	$	239	$	188
Accounts payable to affiliated companies	198		88
Notes payable to affiliated companies	—		131
Taxes accrued	83		62
Interest accrued	59		51
Current maturities of long-term debt	151		70
Asset retirement obligations	177		168
Regulatory liabilities	147		111
Other	104		83
Total current liabilities	1,158		952
Long-Term Debt	3,791		3,871
Long-Term Debt Payable to Affiliated Companies	150		150
Other Noncurrent Liabilities
Deferred income taxes	1,289		1,228
Asset retirement obligations	966		1,008
Regulatory liabilities	1,573		1,627
Operating lease liabilities	49		53
Accrued pension and other post-retirement benefit costs	172		171
Investment tax credits	172		168
Other	53		30
Total other noncurrent liabilities	4,274		4,285
Commitments and Contingencies
Equity
Member's Equity	5,055		4,783
Total Liabilities and Equity	$	14,428	$	14,041

See Notes to Condensed Consolidated Financial Statements

36

FINANCIAL STATEMENTS

DUKE ENERGY INDIANA, LLC

Condensed Consolidated Statements of Cash Flows

(Unaudited)

	Nine Months Ended
	September 30,
(in millions)	2021		2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$	396	$	299
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	460		416
Equity component of AFUDC	(19)		(18)
Impairment of assets and other charges	8		—
Deferred income taxes	19		11
Payments for asset retirement obligations	(49)		(48)
(Increase) decrease in
Receivables	(7)		15
Receivables from affiliated companies	17		(5)
Inventory	106		10
Other current assets	(58)		12
Increase (decrease) in
Accounts payable	46		(1)
Accounts payable to affiliated companies	(15)		(22)
Taxes accrued	25		65
Other current liabilities	23		(2)
Other assets	11		(41)
Other liabilities	3		104
Net cash provided by operating activities	966		795
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(584)		(669)
Purchases of debt and equity securities	(34)		(24)
Proceeds from sales and maturities of debt and equity securities	16		15
Notes receivable from affiliated companies	(218)		—
Other	(8)		(24)
Net cash used in investing activities	(828)		(702)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	—		544
Payments for the redemption of long-term debt	—		(500)
Notes payable to affiliated companies	(131)		53
Distributions to parent	—		(200)
Net cash used in financing activities	(131)		(103)
Net increase (decrease) in cash and cash equivalents	7		(10)
Cash and cash equivalents at beginning of period	7		25
Cash and cash equivalents at end of period	$	14	$	15
Supplemental Disclosures:
Significant non-cash transactions:
Accrued capital expenditures	$	105	$	73

See Notes to Condensed Consolidated Financial Statements

37

FINANCIAL STATEMENTS

DUKE ENERGY INDIANA, LLC

Condensed Consolidated Statements of Changes in Equity

(Unaudited)

	Three Months Ended
	September 30, 2020 and 2021
(in millions)	Member's Equity
Balance at June 30, 2020	$	4,655
Net income	119
Distributions to parent	(100)
Balance at September 30, 2020	$	4,674
Balance at June 30, 2021	$	4,999
Net income	181
Distributions to parent	(125)
Balance at September 30, 2021	$	5,055
	Nine Months Ended
	September 30, 2020 and 2021
(in millions)	Member's Equity
Balance at December 31, 2019	$	4,575
Net income	299
Distributions to parent	(200)
Balance at September 30, 2020	$	4,674
Balance at December 31, 2020	$	4,783
Net income	396
Distributions to parent	(125)
Other	1
Balance at September 30, 2021	$	5,055

See Notes to Condensed Consolidated Financial Statements

38

FINANCIAL STATEMENTS

PIEDMONT NATURAL GAS COMPANY, INC.

Condensed Consolidated Statements of Operations and Comprehensive Income

(Unaudited)

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in millions)	2021		2020		2021		2020
Operating Revenues	$	195	$	162	$	1,016	$	871
Operating Expenses
Cost of natural gas	66		39		354		254
Operation, maintenance and other	77		75		231		234
Depreciation and amortization	51		45		150		133
Property and other taxes	16		13		44		37
Impairment of assets and other charges	4		7		9		7
Total operating expenses	214		179		788		665
Operating (Loss) Income	(19)		(17)		228		206
Other Income and Expenses, net	16		16		51		44
Interest Expense	29		29		88		89
(Loss) Income Before Income Taxes	(32)		(30)		191		161
Income Tax (Benefit) Expense	(8)		(5)		16		6
Net (Loss) Income and Comprehensive (Loss) Income	$	(24)	$	(25)	$	175	$	155

See Notes to Condensed Consolidated Financial Statements

39

FINANCIAL STATEMENTS

PIEDMONT NATURAL GAS COMPANY, INC.

Condensed Consolidated Balance Sheets

(Unaudited)

(in millions)	September 30, 2021		December 31, 2020
ASSETS
Current Assets
Receivables (net of allowance for doubtful accounts of $15 at 2021 and $12 at 2020)	$	96	$	250
Receivables from affiliated companies	11		10
Inventory	68		68
Regulatory assets	125		153
Other	59		20
Total current assets	359		501
Property, Plant and Equipment
Cost	9,733		9,134
Accumulated depreciation and amortization	(1,862)		(1,749)
Facilities to be retired, net	11		—
Net property, plant and equipment	7,882		7,385
Other Noncurrent Assets
Goodwill	49		49
Regulatory assets	335		302
Operating lease right-of-use assets, net	17		20
Investments in equity method unconsolidated affiliates	100		88
Other	282		270
Total other noncurrent assets	783		729
Total Assets	$	9,024	$	8,615
LIABILITIES AND EQUITY
Current Liabilities
Accounts payable	$	184	$	230
Accounts payable to affiliated companies	31		79
Notes payable to affiliated companies	315		530
Taxes accrued	41		23
Interest accrued	35		34
Current maturities of long-term debt	—		160
Regulatory liabilities	64		88
Other	76		69
Total current liabilities	746		1,213
Long-Term Debt	2,968		2,620
Other Noncurrent Liabilities
Deferred income taxes	875		821
Asset retirement obligations	21		20
Regulatory liabilities	1,004		1,044
Operating lease liabilities	15		19
Accrued pension and other post-retirement benefit costs	6		8
Other	175		155
Total other noncurrent liabilities	2,096		2,067
Commitments and Contingencies
Equity
Common stock, no par value: 100 shares authorized and outstanding at 2021 and 2020	1,635		1,310
Retained earnings	1,579		1,405
Total equity	3,214		2,715
Total Liabilities and Equity	$	9,024	$	8,615

See Notes to Condensed Consolidated Financial Statements

40

FINANCIAL STATEMENTS

PIEDMONT NATURAL GAS COMPANY, INC.

Condensed Consolidated Statements of Cash Flows

(Unaudited)

	Nine Months Ended
	September 30,
(in millions)	2021		2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$	175	$	155
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	152		135
Equity component of AFUDC	(19)		(14)
Impairment of assets and other charges	10		7
Deferred income taxes	10		24
Equity in earnings from unconsolidated affiliates	(7)		(7)
Provision for rate refunds	(3)		(27)
(Increase) decrease in
Receivables	151		164
Receivables from affiliated companies	(1)		(1)
Inventory	—		25
Other current assets	7		(59)
Increase (decrease) in
Accounts payable	(55)		(53)
Accounts payable to affiliated companies	(48)		60
Taxes accrued	17		16
Other current liabilities	(32)		(4)
Other assets	3		(14)
Other liabilities	2		7
Net cash provided by operating activities	362		414
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(628)		(641)
Contributions to equity method investments	(9)		—
Return of investment capital	1		—
Other	(23)		(18)
Net cash used in investing activities	(659)		(659)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	347		394
Payments for the redemption of long-term debt	(160)		—
Notes payable to affiliated companies	(215)		(149)
Capital contributions from parent	325		—
Net cash provided by financing activities	297		245
Net increase in cash and cash equivalents	—		—
Cash and cash equivalents at beginning of period	—		—
Cash and cash equivalents at end of period	$	—	$	—
Supplemental Disclosures:
Significant non-cash transactions:
Accrued capital expenditures	$	115	$	123

See Notes to Condensed Consolidated Financial Statements

41

FINANCIAL STATEMENTS

PIEDMONT NATURAL GAS COMPANY, INC.

Condensed Consolidated Statements of Changes in Equity

(Unaudited)

	Three Months Ended September 30, 2020 and 2021
	Common		Retained		Total
(in millions)	Stock		Earnings		Equity
Balance at June 30, 2020	$	1,310	$	1,312	$	2,622
Net loss	—		(25)		(25)
Balance at September 30, 2020	$	1,310	$	1,287	$	2,597
Balance at June 30, 2021	$	1,635	$	1,604	$	3,239
Net loss	—		(24)		(24)
Other	—		(1)		(1)
Balance at September 30, 2021	$	1,635	$	1,579	$	3,214
	Nine Months Ended September 30, 2020 and 2021
	Common		Retained		Total
(in millions)	Stock		Earnings		Equity
Balance at December 31, 2019	$	1,310	$	1,133	$	2,443
Net income	—		155		155
Other	—		(1)		(1)
Balance at September 30, 2020	$	1,310	$	1,287	$	2,597
Balance at December 31, 2020	$	1,310	$	1,405	$	2,715
Net income	—		175		175
Contribution from parent	325		—		325
Other	—		(1)		(1)
Balance at September 30, 2021	$	1,635	$	1,579	$	3,214

See Notes to Condensed Consolidated Financial Statements

42

FINANCIAL STATEMENTS ORGANIZATION AND BASIS OF PRESENTATION

Index to Combined Notes to Condensed Consolidated Financial Statements

The unaudited notes to the Condensed Consolidated Financial Statements that follow are a combined presentation. The following list indicates the registrants to which the footnotes apply.

Applicable Notes

Registrant

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

Duke Energy

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Duke Energy Carolinas

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Progress Energy

•

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Duke Energy Progress

•

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Duke Energy Florida

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Duke Energy Ohio

•

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Duke Energy Indiana

•

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Piedmont

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•

Tables within the notes may not sum across due to (i) Progress Energy's consolidation of Duke Energy Progress, Duke Energy Florida and other subsidiaries that are not registrants and (ii) subsidiaries that are not registrants but included in the consolidated Duke Energy balances.

1. ORGANIZATION AND BASIS OF PRESENTATION

BASIS OF PRESENTATION

These Condensed Consolidated Financial Statements have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Regulation S-X. Accordingly, these Condensed Consolidated Financial Statements do not include all information and notes required by GAAP for annual financial statements and should be read in conjunction with the Consolidated Financial Statements in the Duke Energy Registrants’ combined Annual Report on Form 10-K for the year ended December 31, 2020.

The information in these combined notes relates to each of the Duke Energy Registrants as noted in the Index to Combined Notes to Condensed Consolidated Financial Statements. However, none of the registrants make any representations as to information related solely to Duke Energy or the subsidiaries of Duke Energy other than itself.

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

In preparing financial statements that conform to GAAP, management must make estimates and assumptions that affect the reported amounts of assets and liabilities, the reported amounts of revenues and expenses and the disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates.

BASIS OF CONSOLIDATION

These Condensed Consolidated Financial Statements include, after eliminating intercompany transactions and balances, the accounts of the Duke Energy Registrants and subsidiaries or VIEs where the respective Duke Energy Registrants have control. See Note 11 for additional information on VIEs. These Condensed Consolidated Financial Statements also reflect the Duke Energy Registrants’ proportionate share of certain jointly owned generation and transmission facilities.

OTHER CURRENT LIABILITIES

Included in Other within Current Liabilities on the Duke Energy Condensed Consolidated Balance Sheet is a current liability of $36 million and $936 million as of September 30, 2021, and December 31, 2020, respectively. The current liability, initially recorded in 2020, primarily represented Duke Energy's share of ACP's obligations of outstanding debt and to satisfy ARO requirements to restore construction sites. See Notes 3 and 11 for further information.

NONCONTROLLING INTEREST

Duke Energy maintains a controlling financial interest in certain less than wholly owned nonregulated subsidiaries. As a result, Duke Energy consolidates these subsidiaries and presents the third-party investors' portion of Duke Energy's net income (loss), net assets and comprehensive income (loss) as noncontrolling interest. Noncontrolling interest is included as a component of equity on the Condensed Consolidated Balance Sheet.

Several operating agreements of Duke Energy's subsidiaries with noncontrolling interest are subject to allocations of earnings, tax attributes and cash flows in accordance with contractual agreements that vary throughout the lives of the subsidiaries. Therefore, Duke Energy and the other investors' (the owners) interests in the subsidiaries are not fixed, and the subsidiaries apply the Hypothetical Liquidation at Book Value (HLBV) method in allocating income or loss and other comprehensive income or loss (all measured on a pretax basis) to the owners. The HLBV method measures the amounts that each owner would hypothetically claim at each balance sheet reporting date, including tax benefits realized by the owners over the IRS recapture period, upon a hypothetical liquidation of the subsidiary at the net book value of its underlying assets. The change in the amount that each owner would hypothetically receive at the reporting date compared to the amount it would have received on the previous reporting date represents the amount of income or loss allocated to each owner for the reporting period.

43

FINANCIAL STATEMENTS ORGANIZATION AND BASIS OF PRESENTATION

During September 2021, Duke Energy completed the initial minority interest investment in a portion of Duke Energy Indiana to an affiliate of GIC. GIC's ownership interest in Duke Energy Indiana represents a noncontrolling interest. See Note 2 for additional information on the sale.

Other operating agreements of Duke Energy's subsidiaries with noncontrolling interest allocate profit and loss based on their pro rata shares of the ownership interest in the respective subsidiary. Therefore, Duke Energy allocates net income or loss and other comprehensive income or loss of these subsidiaries to the owners based on their pro rata shares.

The following table presents allocated losses to noncontrolling interest for the three and nine months ended September 30, 2021, and 2020.

	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2021		2020		2021		2020
Noncontrolling Interest Allocation of Income
Allocated losses to noncontrolling tax equity members utilizing the HLBV method	$	119	$	59	$	217	$	187
Allocated losses to noncontrolling members based on pro rata shares of ownership	10		11		30		21
Total Noncontrolling Interest Allocated Losses	$	129	$	70	$	247	$	208

CASH, CASH EQUIVALENTS AND RESTRICTED CASH

Duke Energy, Progress Energy and Duke Energy Florida have restricted cash balances related primarily to collateral assets, escrow deposits and VIEs. See Notes 9 and 11 for additional information. Restricted cash amounts are included in Other within Current Assets and Other Noncurrent Assets on the Condensed Consolidated Balance Sheets. The following table presents the components of cash, cash equivalents and restricted cash included in the Condensed Consolidated Balance Sheets.

	September 30, 2021						December 31, 2020
					Duke						Duke
	Duke		Progress		Energy		Duke		Progress		Energy
	Energy		Energy		Florida		Energy		Energy		Florida
Current Assets
Cash and cash equivalents	$	548	$	102	$	40	$	259	$	59	$	11
Other	194		17		17		194		39		39
Other Noncurrent Assets
Other	1		—		—		103		102		—
Total cash, cash equivalents and restricted cash	$	743	$	119	$	57	$	556	$	200	$	50

INVENTORY

Provisions for inventory write-offs were not material at September 30, 2021, and December 31, 2020. The components of inventory are presented in the tables below.

	September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Materials and supplies	$	2,317	$	779	$	1,009	$	674	$	336	$	85	$	305	$	11
Coal	312		152		89		45		43		10		61		—
Natural gas, oil and other fuel	271		38		157		96		60		19		1		57
Total inventory	$	2,900	$	969	$	1,255	$	815	$	439	$	114	$	367	$	68

	December 31, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Materials and supplies	$	2,312	$	785	$	999	$	673	$	325	$	78	$	307	$	12
Coal	561		186		193		131		63		16		165		—
Natural gas, oil and other fuel	294		39		183		107		76		16		1		56
Total inventory	$	3,167	$	1,010	$	1,375	$	911	$	464	$	110	$	473	$	68

44

FINANCIAL STATEMENTS ORGANIZATION AND BASIS OF PRESENTATION

PROPERTY, PLANT & EQUIPMENT AND LEASES

Duke Energy continues to execute on its business transformation strategy, including the evaluation of in-office work policies considering the experience with the COVID-19 pandemic and also workforce realignment of roles and responsibilities. In May 2021, Duke Energy management approved the sale of certain properties and entered into an agreement to exit certain leased space on December 31, 2021. The sale of the properties is subject to abandonment accounting and resulted in an impairment charge. Additionally, the exit of the leased space resulted in the impairment of related furniture, fixtures and equipment. The total 2021 charges related to the reduction in physical workspace, including these impairments, are expected to be approximately $200 million. During the three months ended September 30, 2021, Duke Energy recorded a pretax charge to earnings of $9 million on the Condensed Consolidated Statements of Operations, which includes $8 million within Impairment of assets and other charges and $1 million within Operations, maintenance and other. During the nine months ended September 30, 2021, Duke Energy recorded a pretax charge to earnings of $184 million on the Condensed Consolidated Statements of Operations, which includes $139 million within Impairment of assets and other charges, $28 million within Operations, maintenance and other and $17 million within Depreciation and amortization.

NEW ACCOUNTING STANDARDS

The following new accounting standard was adopted by the Duke Energy Registrants in 2021.

Leases with Variable Lease Payments. In July 2021, the Financial Accounting Standards Board (FASB) issued new accounting guidance requiring lessors to classify a lease with variable lease payments that do not depend on a reference index or rate as an operating lease if both of the following are met: (1) the lease would have to be classified as a sales-type or direct financing lease under prior guidance, and (2) the lessor would have recognized a day-one loss. Duke Energy elected to adopt the guidance immediately upon issuance of the new standard and will be applying the new standard prospectively to new lease arrangements meeting the criteria. Duke Energy does not currently have any lease arrangements that this new accounting guidance will materially impact.

The following accounting standard was adopted by the Duke Energy Registrants in 2020.

Current Expected Credit Losses. In June 2016, the FASB issued new accounting guidance for credit losses. Duke Energy adopted the new accounting guidance for credit losses effective January 1, 2020, using the modified retrospective method of adoption, which does not require restatement of prior year results. Duke Energy did not adopt any practical expedients.

Duke Energy recognizes allowances for credit losses based on management's estimate of losses expected to be incurred over the lives of certain assets or guarantees. Management monitors credit quality, changes in expected credit losses and the appropriateness of the allowance for credit losses on a forward-looking basis. Management reviews the risk of loss periodically as part of the existing assessment of collectability of receivables.

Duke Energy reviews the credit quality of its counterparties as part of its regular risk management process and requires credit enhancements, such as deposits or letters of credit, as appropriate and as allowed by regulators.

Duke Energy recorded cumulative effects of changes in accounting principles related to the adoption of the new credit loss standard for allowances for credit losses of trade and other receivables, insurance receivables and financial guarantees. These amounts are included in the Condensed Consolidated Balance Sheets in Receivables, Receivables of VIEs, Other Noncurrent Assets and Other Noncurrent Liabilities. See Notes 4 and 12 for more information.

Duke Energy recorded an adjustment for the cumulative effect of a change in accounting principle due to the adoption of this standard on January 1, 2020, as shown in the table below:

	January 1, 2020
			Duke				Duke		Duke
	Duke		Energy		Progress		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Piedmont
Total pretax impact to Retained Earnings	$	120	$	16	$	2	$	1	$	1	$	1

The following new accounting standard has been issued but not yet adopted by the Duke Energy Registrants as of September 30, 2021.

Reference Rate Reform. In March 2020, the FASB issued new accounting guidance for reference rate reform. This guidance is elective and provides expedients to facilitate financial reporting for the anticipated transition away from the London Inter-bank Offered Rate (LIBOR) and other interbank reference rates by the end of 2022. The optional expedients are effective for modification of existing contracts or new arrangements executed between March 12, 2020, through December 31, 2022.

Duke Energy has variable-rate debt and manages interest rate risk by entering into financial contracts including interest rate swaps that are generally indexed to LIBOR. Impacted financial arrangements extending beyond 2022 may require contractual amendment or termination to fully adapt to a post-LIBOR environment. Duke Energy is assessing these financial arrangements and is evaluating the use of optional expedients outlined in the new accounting guidance. Alternative index provisions are also being assessed and incorporated into new financial arrangements that extend beyond 2022. The full outcome of the transition away from LIBOR cannot be determined at this time, but is not expected to have a material impact on the financial statements.

2. BUSINESS SEGMENTS

Duke Energy

Duke Energy's segment structure includes the following segments: Electric Utilities and Infrastructure, Gas Utilities and Infrastructure and Commercial Renewables.

45

FINANCIAL STATEMENTS BUSINESS SEGMENTS

The Electric Utilities and Infrastructure segment primarily includes Duke Energy's regulated electric utilities in the Carolinas, Florida and the Midwest. On January 28, 2021, Duke Energy executed an agreement providing for an investment by an affiliate of GIC in Duke Energy Indiana in exchange for a 19.9% minority interest issued by Duke Energy Indiana Holdco, LLC, the holding company for Duke Energy Indiana. The transaction will be completed following two closings for an aggregate purchase price of approximately $2 billion. The first closing, which occurred on September 8, 2021, resulted in Duke Energy Indiana Holdco, LLC issuing 11.05% of its membership interests in exchange for approximately $1,025 million or 50% of the purchase price. Duke Energy retained indirect control of these assets, and, therefore, no gain or loss was recognized on the Condensed Consolidated Statements of Operations. The difference between the cash consideration received, net of transaction costs of approximately $27 million, and the carrying value of the noncontrolling interest is $545 million and was recorded as an increase to equity.

The Gas Utilities and Infrastructure segment includes Piedmont, Duke Energy's natural gas local distribution companies in Ohio and Kentucky and Duke Energy's natural gas storage, midstream pipeline and renewable natural gas investments.

The Commercial Renewables segment is primarily comprised of nonregulated utility-scale wind and solar generation assets located throughout the U.S. In 2021, Duke Energy continues to monitor recoverability of its renewable merchant plants located in the Electric Reliability Council of Texas West market and in the PJM West market due to fluctuating market pricing and long-term forecasted energy prices. The assets were not impaired as of September 30, 2021, because the carrying value of approximately $206 million continues to approximate the aggregate estimated future undiscounted cash flows. Duke Energy has a 50% ownership interest in these assets. A continued decline in energy market pricing or other factors unfavorably impacting the economics would likely result in a future impairment.

The remainder of Duke Energy’s operations is presented as Other, which is primarily comprised of interest expense on holding company debt, unallocated corporate costs, Duke Energy’s wholly owned captive insurance company, Bison, and Duke Energy's ownership interest in National Methanol Company.

Business segment information is presented in the following tables. Segment assets presented exclude intercompany assets.

	Three Months Ended September 30, 2021
	Electric		Gas				Total
	Utilities and		Utilities and		Commercial		Reportable
(in millions)	Infrastructure		Infrastructure		Renewables		Segments		Other		Eliminations		Total
Unaffiliated revenues	$	6,560	$	266	$	117	$	6,943	$	8	$	—	$	6,951
Intersegment revenues	9		23		—		32		20		(52)		—
Total revenues	$	6,569	$	289	$	117	$	6,975	$	28	$	(52)	$	6,951
Segment income (loss)(a)	$	1,425	$	(3)	$	78	$	1,500	$	(134)	$	—	$	1,366
Less: Noncontrolling interests													129
Add: Preferred stock dividend													39
Net Income													$	1,276
Segment assets	$	141,565	$	14,692	$	7,037	$	163,294	$	3,717	$	(4)	$	167,007

	Three Months Ended September 30, 2020
	Electric		Gas				Total
	Utilities and		Utilities and		Commercial		Reportable
(in millions)	Infrastructure		Infrastructure		Renewables		Segments		Other		Eliminations		Total
Unaffiliated revenues	$	6,371	$	217	$	126	$	6,714	$	7	$	—	$	6,721
Intersegment revenues	8		24		—		32		17		(49)		—
Total revenues	$	6,379	$	241	$	126	$	6,746	$	24	$	(49)	$	6,721
Segment income (loss)(b)	$	1,381	$	(73)	$	60	$	1,368	$	(103)	$	—	$	1,265
Less: Noncontrolling interests													70
Add: Preferred stock dividend													39
Net Income													$	1,234

46

FINANCIAL STATEMENTS BUSINESS SEGMENTS

(a)Gas Utilities and Infrastructure includes $3 million, recorded within Equity in earnings (losses) of unconsolidated affiliates on the Condensed Consolidated Statements of Operations, related to gas pipeline investments. See Note 3 for additional information. Other includes $8 million recorded within Impairment of assets and other charges, $1 million within Operations, maintenance and other on the Condensed Consolidated Statements of Operations, related to the workplace and workforce realignment. See Note 1 for additional information. Electric Utilities and Infrastructure includes $160 million recorded within Impairment of assets and other charges, $77 million within Other Income and expenses, $5 million within Operations, maintenance and other, $13 million within Regulated electric operating revenues and $3 million within Interest expense on the Duke Energy Carolinas' Condensed Consolidated Statement of Operations related to the 2018 South Carolina rate cases and the CCR settlement and insurance proceeds distributed in accordance with that agreement; it also includes $42 million recorded within Impairment of assets and other charges, $34 million within Other Income and expenses, $7 million within Operations, maintenance, and other, $15 million within Regulated electric operating revenues and $5 million within Interest expense on the Duke Energy Progress' Condensed Consolidated Statement of Operations. See Notes 3 and 4 for more information.

(b)Electric Utilities and Infrastructure includes $19 million recorded within Impairment charges and $8 million recorded within Operations, maintenance and other on the Duke Energy Carolinas' Condensed Consolidated Statements of Operations related to a partial settlement in the Duke Energy Carolinas' 2019 North Carolina rate case and $8 million recorded within Operations, maintenance and other on Duke Energy Progress' Condensed Consolidated Statements of Operation related to a partial settlement in the Duke Energy Progress' 2019 North Carolina rate case. See Note 3 for more information. Additionally, Electric Utilities and Infrastructure includes $5 million of Impairment charges related to gas pipeline assets recorded on Duke Energy Progress' Condensed Consolidated Statement of Operations. Gas Utilities and Infrastructure includes $78 million recorded within Equity in earnings (losses) of unconsolidated affiliates on the Condensed Consolidated Statements of Operations and $7 million in Impairment charges recorded on the Piedmont Condensed Consolidated Statements of Operations related to gas pipeline investments.

	Nine Months Ended September 30, 2021
	Electric		Gas				Total
	Utilities and		Utilities and		Commercial		Reportable
(in millions)	Infrastructure		Infrastructure		Renewables		Segments		Other		Eliminations		Total
Unaffiliated revenues	$	17,161	$	1,323	$	355	$	18,839	$	20	$	—	$	18,859
Intersegment revenues	24		68		—		92		61		(153)		—
Total revenues	$	17,185	$	1,391	$	355	$	18,931	$	81	$	(153)	$	18,859
Segment income (loss)(a)	$	3,180	$	259	$	152	$	3,591	$	(521)	$	—	$	3,070
Less: Noncontrolling interests													247
Add: Preferred stock dividend													92
Net Income													$	2,915

	Nine Months Ended September 30, 2020
	Electric		Gas				Total
	Utilities and		Utilities and		Commercial		Reportable
(in millions)	Infrastructure		Infrastructure		Renewables		Segments		Other		Eliminations		Total
Unaffiliated revenues	$	16,571	$	1,122	$	378	$	18,071	$	20	$	—	$	18,091
Intersegment revenues	25		72		—		97		53		(150)		—
Total revenues	$	16,596	$	1,194	$	378	$	18,168	$	73	$	(150)	$	18,091
Segment income (loss)(b)	$	2,839	$	(1,400)	$	207	$	1,646	$	(299)	$	—	$	1,347
Less: Noncontrolling interests													208
Add: Preferred stock dividend													93
Net Income													$	1,232

47

FINANCIAL STATEMENTS BUSINESS SEGMENTS

(a)Gas Utilities and Infrastructure includes $19 million, recorded within Equity in earnings (losses) of unconsolidated affiliates on the Condensed Consolidated Statements of Operations, related to gas pipeline investments. See Note 3 for additional information. Commercial Renewables includes a $35 million loss related to Texas Storm Uri, of which ($8 million) is recorded within Nonregulated electric and other revenues, $2 million within Operations, maintenance and other, $29 million within Equity in earnings (losses) of unconsolidated affiliates and $12 million within Loss Attributable to Noncontrolling Interests on the Condensed Consolidated Statements of Operations. See Note 4 for additional information. Other includes $139 million recorded within Impairment of assets and other charges, $28 million within Operations, maintenance and other, and $17 million within Depreciation and amortization on the Condensed Consolidated Statements of Operations, related to the workplace and workplace realignment. See Note 1 for additional information. Electric Utilities and Infrastructure includes $160 million recorded within Impairment of assets and other charges, $77 million within Other Income and expenses, $5 million within Operations, maintenance and other, $13 million within regulated operating revenues and $3 million within interest expense on the Duke Energy Carolinas' Condensed Consolidated Statement of Operations related to the 2018 South Carolina rate cases and the CCR settlement and insurance proceeds distributed in accordance with that agreement; it also includes $42 million recorded within Impairment of assets and other charges, $34 million within Other Income and expenses, $7 million within Operations, maintenance, and other, $15 million within Regulated electric operating revenues and $5 million within interest expense on the Duke Energy Progress' Condensed Consolidated Statement of Operations. See Notes 3 and 4 for more information.

(b)Gas Utilities and Infrastructure includes $2 billion recorded within Equity in earnings (losses) of unconsolidated affiliates on the Condensed Consolidated Statements of Operations, related to gas pipeline investments. See Note 3 for additional information. Other includes a $98 million reversal, included in Operations, maintenance and other on the Condensed Consolidated Statements of Operations, of 2018 severance costs due to a partial settlement in the Duke Energy Carolinas' 2019 North Carolina rate case. See Note 3 for additional information. Electric Utilities and Infrastructure includes $19 million recorded within Impairment charges and $8 million recorded within Operations, maintenance and other on the Duke Energy Carolinas' Condensed Consolidated Statements of Operations related to a partial settlement in the Duke Energy Carolinas' 2019 North Carolina rate case and $8 million recorded within Operations, maintenance and other on Duke Energy Progress' Condensed Consolidated Statements of Operation related to a partial settlement in the Duke Energy Progress' 2019 North Carolina rate case. See Note 3 for more information. Additionally, Electric Utilities and Infrastructure includes $5 million of Impairment charges related to gas pipeline assets recorded on Duke Energy Progress' Condensed Consolidated Statement of Operations in the prior year.

Duke Energy Ohio

Duke Energy Ohio has two reportable segments, Electric Utilities and Infrastructure and Gas Utilities and Infrastructure. The remainder of Duke Energy Ohio's operations is presented as Other.

	Three Months Ended September 30, 2021
	Electric		Gas		Total
	Utilities and		Utilities and		Reportable
(in millions)	Infrastructure		Infrastructure		Segments		Other		Eliminations		Total
Total revenues	$	413	$	93	$	506	$	—	$	—	$	506
Segment income/Net (loss) income	$	48	$	11	$	59	$	(1)	$	—	$	58
Segment assets	$	6,716	$	3,783	$	10,499	$	27	$	(21)	$	10,505

	Three Months Ended September 30, 2020
	Electric		Gas		Total
	Utilities and		Utilities and		Reportable
(in millions)	Infrastructure		Infrastructure		Segments		Other		Total
Total revenues	$	394	$	79	$	473	$	—	$	473
Segment income/Net (loss) income	$	63	$	9	$	72	$	(2)	$	70

	Nine Months Ended September 30, 2021
	Electric		Gas		Total
	Utilities and		Utilities and		Reportable
(in millions)	Infrastructure		Infrastructure		Segments		Other		Total
Total revenues	$	1,119	$	375	$	1,494	$	—	$	1,494
Segment income/Net (loss) income	$	122	$	77	$	199	$	(11)	$	188

	Nine Months Ended September 30, 2020
	Electric		Gas		Total
	Utilities and		Utilities and		Reportable
(in millions)	Infrastructure		Infrastructure		Segments		Other		Total
Total revenues	$	1,070	$	324	$	1,394	$	—	$	1,394
Segment income/Net (loss) income	$	137	$	68	$	205	$	(4)	$	201

48

FINANCIAL STATEMENTS REGULATORY MATTERS

3. REGULATORY MATTERS

RATE-RELATED INFORMATION

The NCUC, PSCSC, FPSC, IURC, PUCO, TPUC and KPSC approve rates for retail electric and natural gas services within their states. The FERC approves rates for electric sales to wholesale customers served under cost-based rates (excluding Ohio and Indiana), as well as sales of transmission service. The FERC also regulates certification and siting of new interstate natural gas pipeline projects.

Duke Energy Carolinas and Duke Energy Progress

2021 Coal Ash Settlement

On January 22, 2021, Duke Energy Carolinas and Duke Energy Progress entered into the Coal Combustion Residuals Settlement Agreement (the “CCR Settlement Agreement”) with the North Carolina Public Staff (Public Staff), the North Carolina Attorney General’s Office and the Sierra Club (collectively, the "Settling Parties"), which was filed with the NCUC on January 25, 2021. The CCR Settlement Agreement resolves all coal ash prudence and cost recovery issues in connection with 2019 rate cases filed by Duke Energy Carolinas and Duke Energy Progress with the NCUC, as well as the equitable sharing issue on remand from the 2017 Duke Energy Carolinas and Duke Energy Progress North Carolina rate cases as a result of the December 11, 2020 North Carolina Supreme Court opinion. The settlement also provides clarity on coal ash cost recovery in North Carolina for Duke Energy Carolinas and Duke Energy Progress through January 2030 and February 2030 (the "Term"), respectively.

Duke Energy Carolinas and Duke Energy Progress agreed not to seek recovery of approximately $1 billion of systemwide deferred coal ash expenditures, but will retain the ability to earn a debt and equity return during the amortization period, which shall be five years under the 2019 North Carolina rate cases and will be set by the NCUC in future rate case proceedings. The equity return and the amortization period on deferred coal ash costs under the 2017 Duke Energy Carolinas and Duke Energy Progress North Carolina rate cases will remain unaffected. The equity return on deferred coal ash costs under the 2019 North Carolina rate cases and future rate cases in North Carolina will be set at 150 basis points lower than the authorized return on equity (ROE) then in effect, with a capital structure composed of 48% debt and 52% equity. Duke Energy Carolinas and Duke Energy Progress retain the ability to earn a full WACC return during the deferral period, which is the period from when costs are incurred until they are recovered in rates.

The Settling Parties agreed that execution by Duke Energy Carolinas and Duke Energy Progress of a settlement agreement between themselves and the NCDEQ dated December 31, 2019, (the “DEQ Settlement”) and the coal ash management plans included therein or subsequently approved by DEQ are reasonable and prudent. The Settling Parties retain the right to challenge the reasonableness and prudence of actions taken by Duke Energy Carolinas and Duke Energy Progress and costs incurred to implement the scope of work agreed upon in the DEQ Settlement, after February 1, 2020, and March 1, 2020, for Duke Energy Carolinas and Duke Energy Progress, respectively. The Settling Parties further agreed to waive rights through the Term to challenge the reasonableness or prudence of Duke Energy Carolinas’ and Duke Energy Progress’ historical coal ash management practices, and to waive the right to assert any arguments that future coal ash costs, including financing costs, shall be shared between either company and customers through equitable sharing or any other rate base or return adjustment that shares the revenue requirement burden of coal ash costs not otherwise disallowed due to imprudence.

The Settling Parties agreed to a sharing arrangement for future coal ash insurance litigation proceeds between Duke Energy Carolinas and Duke Energy Progress and North Carolina customers. For more information, see Note 4 "Commitments and Contingencies."

As a result of the CCR Settlement Agreement, Duke Energy Carolinas and Duke Energy Progress recorded a pretax charge of approximately $454 million and $494 million, respectively, in the fourth quarter of 2020 to Impairment charges and a reversal of approximately $50 million and $102 million, respectively, to Regulated electric operating revenues on the respective Consolidated Statements of Operations.

The Coal Ash Settlement was approved without modification in the NCUC Orders in the 2019 rate cases on March 31, 2021, and April 16, 2021, for Duke Energy Carolinas and Duke Energy Progress, respectively. The NCUC issued an Order on Remand Accepting CCR Settlement and Affirming Previous Orders Setting Rates and Imposing Penalties in the 2017 rate cases on June 25, 2021.

2020 North Carolina Storm Securitization Filings

On October 26, 2020, Duke Energy Carolinas and Duke Energy Progress filed a joint petition with the NCUC, as agreed to in partial settlements reached in the 2019 North Carolina Rate Cases for Duke Energy Carolinas and Duke Energy Progress, seeking authorization for the financing of the costs of each utility's storm recovery activities required as a result of Hurricane Florence, Hurricane Michael, Hurricane Dorian and Winter Storm Diego. Specifically, Duke Energy Carolinas and Duke Energy Progress requested that the NCUC find that their storm recovery costs and related financing costs are appropriately financed by debt secured by storm recovery property, and that the commission issue financing orders by which each utility may accomplish such financing using a securitization structure. On January 27, 2021, Duke Energy Carolinas, Duke Energy Progress and the Public Staff filed an Agreement and Stipulation of Partial Settlement, subject to review and approval of the NCUC, resolving certain accounting issues, including agreement to support an 18- to 20-year bond period. The total revenue requirement over a proposed 20-year bond period for the storm recovery charges is approximately $287 million for Duke Energy Carolinas and $920 million for Duke Energy Progress and will be finalized upon issuance of the bonds. A remote evidentiary hearing ended on January 29, 2021. In the NCUC Orders in the 2019 rate cases issued on March 31, 2021, and April 16, 2021, for Duke Energy Carolinas and Duke Energy Progress, respectively, the reasonableness and prudence of the deferred storm costs was approved. On May 10, 2021, the NCUC issued financing orders authorizing the companies to issue storm recovery bonds, subject to the terms of the financing orders, and approving the Agreement and Stipulation of Partial Settlement in its entirety. Duke Energy Carolinas and Duke Energy Progress are currently in the process of structuring and marketing the bonds that will be presented to the market. Duke Energy Carolinas and Duke Energy Progress cannot predict the outcome of this matter.

49

FINANCIAL STATEMENTS REGULATORY MATTERS

COVID-19 Filings

North Carolina

Duke Energy Carolinas and Duke Energy Progress filed a joint petition on August 7, 2020, with the NCUC for deferral treatment of incremental costs and the cost of waived customer fees due to the COVID-19 pandemic. Comments on the joint petition were filed on November 5, 2020, and reply comments were filed on November 30, 2020. A summary of incremental COVID-19 costs incurred as of June 30, 2021, was filed with the NCUC by Duke Energy Carolinas and Duke Energy Progress on August 6, 2021. Duke Energy Carolinas and Duke Energy Progress cannot predict the outcome of this matter.

South Carolina

Duke Energy Carolinas and Duke Energy Progress filed a report on June 30, 2020, as required by PSCSC order, reporting revenue impact, costs and savings related to COVID-19 to date. On August 14, 2020, Duke Energy Carolinas and Duke Energy Progress filed a joint petition with the PSCSC for approval of an accounting order to defer incremental COVID-19 related costs incurred through June 30, 2020, and for the ongoing months during the duration of the COVID-19 pandemic. Duke Energy Carolinas and Duke Energy Progress withdrew their joint petition on May 17, 2021.

Duke Energy Carolinas

2017 North Carolina Rate Case

On August 25, 2017, Duke Energy Carolinas filed an application with the NCUC for a rate increase for retail customers of approximately $647 million. On February 28, 2018, Duke Energy Carolinas and the Public Staff filed an Agreement and Stipulation of Partial Settlement resolving certain portions of the proceeding. Terms of the settlement included an ROE of 9.9% and a capital structure of 52% equity and 48% debt. On June 22, 2018, the NCUC issued an order approving the Stipulation of Partial Settlement and requiring a revenue reduction.

The North Carolina Attorney General and other parties separately filed Notices of Appeal to the North Carolina Supreme Court. The North Carolina Supreme Court consolidated the Duke Energy Carolinas and Duke Energy Progress appeals. On December 11, 2020, the North Carolina Supreme Court issued an opinion, which affirmed, in part, and reversed and remanded, in part, the NCUC’s decisions. In the Opinion, the court upheld the NCUC's decision to include coal ash costs in the cost of service, as well as the NCUC’s discretion to allow a return on the unamortized balance of coal ash costs. The court also remanded to the NCUC a single issue to consider the assessment of support for the Public Staff’s equitable sharing argument. On January 22, 2021, Duke Energy Carolinas and Duke Energy Progress entered into the CCR Settlement Agreement with the Settling Parties, which was filed with the NCUC on January 25, 2021, and approved by the NCUC on March 31, 2021. The NCUC issued an Order on Remand Accepting CCR Settlement and Affirming Previous Orders Setting Rates and Imposing Penalties on June 25, 2021.

2019 North Carolina Rate Case

On September 30, 2019, Duke Energy Carolinas filed an application with the NCUC for a net rate increase for retail customers of approximately $291 million, which represented an approximate 6% increase in annual base revenues. The gross rate case revenue increase request was $445 million, which was offset by an EDIT rider of $154 million to return to customers North Carolina and federal EDIT resulting from recent reductions in corporate tax rates. The request for a rate increase was driven by major capital investments subsequent to the previous base rate case, coal ash pond closure costs, accelerated coal plant depreciation and deferred 2018 storm costs. Duke Energy Carolinas requested rates be effective no later than August 1, 2020.

On March 25, 2020, Duke Energy Carolinas and the Public Staff filed an Agreement and Stipulation of Partial Settlement, subject to review and approval of the NCUC, resolving certain issues in the base rate proceeding. On July 24, 2020, Duke Energy Carolinas filed its request for approval of its notice to customers required to implement temporary rates. On July 27, 2020, Duke Energy Carolinas filed a joint motion with Duke Energy Progress and the Public Staff notifying the commission that the parties reached a joint partial settlement with the Public Staff. Also on July 27, 2020, Duke Energy Carolinas filed a letter stating that it intended to update its temporary rates calculation to reflect the terms of the partial settlement. On July 31, 2020, Duke Energy Carolinas and the Public Staff filed a Second Agreement and Stipulation of Partial Settlement (Second Partial Settlement), subject to review and approval of the NCUC, resolving certain remaining issues in the base rate proceeding. The remaining items litigated at hearing included recovery of deferred coal ash compliance costs that are subject to asset retirement obligation accounting, implementation of new depreciation rates and the amortization period of the loss on the hydro station sale.

On August 4, 2020, Duke Energy Carolinas filed an amended motion for approval of its amended notice to customers, seeking to exercise its statutory right to implement temporary rates subject to refund on or after August 24, 2020. The revenue requirement to be recovered, subject to refund, through the temporary rates was based on and consistent with the base rate component of the Second Partial Settlement and excluded the items to be litigated noted above. The NCUC approved the August 4, 2020 amended temporary rates motion on August 6, 2020, and temporary rates went into effect on August 24, 2020.

The Duke Energy Carolinas evidentiary hearing concluded on September 18, 2020, and post-hearing filings were made with the NCUC from all parties by November 4, 2020. On January 22, 2021, Duke Energy Carolinas and Duke Energy Progress entered into the CCR Settlement Agreement with the Settling Parties, which was filed with the NCUC on January 25, 2021.

On March 31, 2021, the NCUC issued an order approving the March 25, 2020, and July 31, 2020, partial settlements. The order includes approval of 1) an ROE of 9.6% based upon a capital structure of 52% equity and 48% debt; 2) deferral treatment of approximately $800 million of grid improvement projects with a return; 3) a flow back period of five years for unprotected federal EDIT; and 4) the reasonableness and prudence of $213 million of deferred storm costs, which were removed from the rate case and for which Duke Energy Carolinas filed a petition seeking securitization in October 2020. Additionally, the order approved without modification the CCR Settlement Agreement.

50

FINANCIAL STATEMENTS REGULATORY MATTERS

The order denied Duke Energy Carolinas' proposal to shorten the remaining depreciable lives of certain Duke Energy Carolinas coal-fired generating units, indicating the NCUC has not had the chance to fully examine the issue within the context of an integrated resource planning (IRP) proceeding, and upon retirement the remaining net book value of these units should be placed in a regulatory asset account to be amortized over an appropriate period to be determined in a future rate case.

On May 21, 2021, the NCUC issued an Order Approving Rate Schedules, which resulted in a net increase of approximately $33 million. Revised customer rates became effective on June 1, 2021. The deadline to appeal has passed and no parties appealed the NCUC's order.

2018 South Carolina Rate Case

On November 8, 2018, Duke Energy Carolinas filed an application with the PSCSC for a rate increase for retail customers of approximately $168 million.

After hearings in March 2019, the PSCSC issued an order on May 21, 2019, which included an ROE of 9.5% and a capital structure of 53% equity and 47% debt. The order also included the following material components:

•Approval of cancellation of the Lee Nuclear Project, with Duke Energy Carolinas maintaining the Combined Operating License;

•Approval of recovery of $125 million (South Carolina retail portion) of Lee Nuclear Project development costs (including AFUDC through December 2017) over a 12-year period, but denial of a return on the deferred balance of costs;

•Approval of recovery of $96 million of coal ash costs over a five-year period with a return at Duke Energy Carolinas' WACC;

•Denial of recovery of $115 million of certain coal ash costs deemed to be related to the Coal Ash Act and incremental to the federal CCR rule;

•Approval of a $66 million decrease to base rates to reflect the change in ongoing tax expense, primarily the reduction in the federal income tax rate from 35% to 21%;

•Approval of a $45 million decrease through the EDIT Rider to return EDIT resulting from the federal tax rate change and deferred revenues since January 2018 related to the change, to be returned in accordance with the Average Rate Assumption Method (ARAM) for protected EDIT, over a 20-year period for unprotected EDIT associated with Property, Plant and Equipment, over a five-year period for unprotected EDIT not associated with Property, Plant and Equipment and over a five-year period for the deferred revenues; and

•Approval of a $17 million decrease through the EDIT Rider related to reductions in the North Carolina state income tax rate from 6.9% to 2.5% to be returned over a five-year period.

As a result of the order, revised customer rates were effective June 1, 2019. On May 31, 2019, Duke Energy Carolinas filed a Petition for Rehearing or Reconsideration of that order contending substantial rights of Duke Energy Carolinas were prejudiced by unlawful, arbitrary and capricious rulings by the PSCSC on certain issues presented in the proceeding. On June 19, 2019, the PSCSC issued a Directive denying Duke Energy Carolinas' request to rehear or reconsider the commission's rulings on certain issues presented in the proceeding including coal ash remediation and disposal costs, ROE and the recovery of a return on deferred operation and maintenance expenses. An order detailing the commission's decision in the Directive was issued on October 18, 2019. Duke Energy Carolinas filed a notice of appeal on November 15, 2019, with the Supreme Court of South Carolina. On November 20, 2019, the South Carolina Energy Users Committee filed a Notice of Appeal with the Supreme Court of South Carolina. Initial briefs were filed on April 21, 2020, which included the South Carolina Energy User's Committee brief arguing that the PSCSC erred in allowing Duke Energy Carolinas' recovery of costs related to the Lee Nuclear Station. Response briefs were filed on July 6, 2020, and reply briefs were filed on August 11, 2020. Oral arguments were heard before the Supreme Court of South Carolina on May 26, 2021.

On October 27, 2021, the Supreme Court of South Carolina affirmed the PSCSC's May 2019 order to:

•Disallow cost recovery on certain CCR compliance costs the PSCSC deemed to be incremental to the federal CCR rules;

•Disallow recovery of certain coal ash litigation expenses;

•Disallow a return on certain deferred expenses; and

•Allow recovery of Lee Nuclear Project preconstruction costs.

The Supreme Court's decision notes the prior determination made by the PSCSC that Duke Energy could submit coal ash costs for recovery that were not initially approved in the rate case order if such costs can be attributed to the CCR rules. As a result of the Court's opinion, Duke Energy Carolinas recognized a pretax charge of approximately $160 million to Impairment of assets and other charges, and a $31 million increase in Other income and expenses, net, in the Condensed Consolidated Statement of Operations for the three and nine months ended September 30, 2021, principally related to coal ash remediation at retired coal ash basin sites. Duke Energy Carolinas is evaluating whether to file a Petition for rehearing on the Supreme Court's decision. Petitions are due November 11, 2021, unless an extension is sought and granted.

51

FINANCIAL STATEMENTS REGULATORY MATTERS

Oconee Nuclear Station Subsequent License Renewal

On June 7, 2021, Duke Energy Carolinas filed a subsequent license renewal application for the Oconee Nuclear Station (ONS) with the U.S. Nuclear Regulatory Commission (NRC) to renew ONS’s operating license for an additional 20 years. The subsequent license renewal would extend operations of the facility from 60 to 80 years. The current license for units 1 and 2 expire in 2033 and the license for unit 3 expires in 2034. By a Federal Register Notice dated July 28, 2021, the NRC provided a 60-day comment period for persons whose interest may be affected by the issuance of a subsequent renewed license for ONS to file a request for a hearing and a petition for leave to intervene. On September 27, 2021, Beyond Nuclear and Sierra Club (Petitioners) filed a Hearing Request and Petition to Intervene (Hearing Request) and a Petition for Waiver. The Hearing Request proposes three contentions purporting to challenge Duke Energy Carolinas’ environmental report (ER). In general, the proposed contentions claim that the ER does not consider certain information regarding the environmental aspects of Severe Accidents caused by a hypothetical failure of the Jocassee Dam, and therefore does not satisfy the National Environmental Policy Act of 1969, as amended (NEPA), or the NRC’s NEPA-implementing regulations. Duke Energy Carolinas filed its answer to the proposed contentions on October 22, 2021, and the Petitioners have until November 5, 2021, to respond to Duke Energy Carolina’s answer.

Duke Energy Carolinas and Duke Energy Progress intend to seek renewal of operating licenses and 20-year license extensions for all of their nuclear stations. New depreciation rates were implemented for all of the nuclear facilities during the second quarter of 2021. Duke Energy Carolinas and Duke Energy Progress cannot predict the outcome of this matter.

Duke Energy Progress

2017 North Carolina Rate Case

On June 1, 2017, Duke Energy Progress filed an application with the NCUC for a rate increase for retail customers of approximately $477 million, which was subsequently adjusted to $420 million. On November 22, 2017, Duke Energy Progress and the Public Staff filed an Agreement and Stipulation of Partial Settlement resolving certain portions of the proceeding. Terms of the settlement included an ROE of 9.9% and a capital structure of 52% equity and 48% debt. On February 23, 2018, the NCUC issued an order approving the stipulation. The Public Staff, the North Carolina Attorney General and the Sierra Club filed notices of appeal to the North Carolina Supreme Court.

The North Carolina Supreme Court consolidated the Duke Energy Carolinas and Duke Energy Progress appeals. On December 11, 2020, the North Carolina Supreme Court issued an opinion, which affirmed, in part, and reversed and remanded, in part, the NCUC’s decisions. In the Opinion, the court upheld the NCUC's decision to include coal ash costs in the cost of service, as well as the NCUC’s discretion to allow a return on the unamortized balance of coal ash costs. The court also remanded to the NCUC a single issue to consider the assessment of support for the Public Staff’s equitable sharing argument. On January 22, 2021, Duke Energy Progress and Duke Energy Carolinas entered into the CCR Settlement Agreement with the Settling Parties, which was filed with the NCUC on January 25, 2021, and approved by the NCUC on April 16, 2021. The NCUC issued an Order on Remand Accepting CCR Settlement and Affirming Previous Orders Setting Rates and Imposing Penalties on June 25, 2021.

2019 North Carolina Rate Case

On October 30, 2019, Duke Energy Progress filed an application with the NCUC for a net rate increase for retail customers of approximately $464 million, which represented an approximate 12.3% increase in annual base revenues. The gross rate case revenue increase request was $586 million, which was offset by riders of $122 million, primarily an EDIT rider of $120 million to return to customers North Carolina and federal EDIT resulting from recent reductions in corporate tax rates. The request for a rate increase was driven by major capital investments subsequent to the previous base rate case, coal ash pond closure costs, accelerated coal plant depreciation and deferred 2018 storm costs. Duke Energy Progress sought to defer and recover incremental Hurricane Dorian storm costs in this proceeding and requested rates be effective no later than September 1, 2020. As a result of the COVID-19 pandemic, on March 24, 2020, the NCUC suspended the procedural schedule and postponed the previously scheduled evidentiary hearing on this matter indefinitely.

On June 2, 2020, Duke Energy Progress and the Public Staff filed an Agreement and Stipulation of Partial Settlement, subject to review and approval of the NCUC, resolving certain issues in the base rate proceeding. On July 27, 2020, Duke Energy Progress filed a joint motion with Duke Energy Carolinas and the Public Staff notifying the commission that the parties reached a joint partial settlement with the Public Staff. On July 31, 2020, Duke Energy Progress and the Public Staff filed a Second Agreement and Stipulation of Partial Settlement, subject to review and approval of the NCUC, resolving certain remaining issues in the base rate proceeding. The remaining items litigated at hearing included recovery of deferred coal ash compliance costs that are subject to asset retirement obligation accounting and implementation of new depreciation rates.

On August 7, 2020, Duke Energy Progress filed a motion for approval of notice required to implement temporary rates, seeking to exercise its statutory right to implement temporary rates subject to refund on or after September 1, 2020. The revenue requirement to be recovered subject to refund through the temporary rates was based on and consistent with the terms of the base rate component of the settlement agreements with the Public Staff and excluded items to be litigated noted above. In addition, Duke Energy Progress also sought authorization to place a temporary decrement EDIT Rider into effect, concurrent with the temporary base rate change. The NCUC approved the August 7, 2020 temporary rates motion on August 11, 2020, and temporary rates went into effect on September 1, 2020.

The Duke Energy Progress evidentiary hearing concluded on October 6, 2020, and post-hearing filings were filed with the NCUC from all parties by December 4, 2020. On January 22, 2021, Duke Energy Progress and Duke Energy Carolinas entered into the CCR Settlement Agreement with the Settling Parties, which was filed with the NCUC on January 25, 2021.

On April 16, 2021, the NCUC issued an order approving the June 2, 2020, and July 31, 2020, partial settlements. The order includes approval of 1) an ROE of 9.6% based upon a capital structure of 52% equity and 48% debt; 2) deferral treatment of approximately $400 million of grid improvement projects with a return; 3) a flow back period of five years for unprotected federal EDIT; and 4) the reasonableness and prudence of approximately $714 million of deferred storm costs, which were removed from the rate case and for which Duke Energy Progress filed a petition seeking securitization in October 2020. Additionally, the order approved without modification the CCR Settlement Agreement.

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FINANCIAL STATEMENTS REGULATORY MATTERS

The order denied Duke Energy Progress' proposal to shorten the remaining depreciable lives of certain Duke Energy Progress coal-fired generating units, indicating the NCUC has not had the chance to fully examine the issue within the context of an IRP proceeding, and upon retirement the remaining net book value of these units should be placed in a regulatory asset account to be amortized over an appropriate period to be determined in a future rate case.

On May 21, 2021, the NCUC issued an Order Approving Rate Schedules, which resulted in a net increase of approximately $178 million. Revised customer rates became effective on June 1, 2021. The deadline to appeal has passed and no parties appealed the NCUC's order.

2018 South Carolina Rate Case

On November 8, 2018, Duke Energy Progress filed an application with the PSCSC for a rate increase for retail customers of approximately $59 million.

After hearings in April 2019, the PSCSC issued an order on May 21, 2019, which included an ROE of 9.5% and a capital structure of 53% equity and 47% debt. The order also included the following material components:

•Approval of recovery of $4 million of coal ash costs over a five-year period with a return at Duke Energy Progress' WACC;

•Denial of recovery of $65 million of certain coal ash costs deemed to be related to the Coal Ash Act and incremental to the federal CCR rule;

•Approval of a $17 million decrease to base rates to reflect the change in ongoing tax expense, primarily the reduction in the federal income tax rate from 35% to 21%;

•Approval of a $12 million decrease through the EDIT Tax Savings Rider resulting from the federal tax rate change and deferred revenues since January 2018 related to the change, to be returned in accordance with ARAM for protected EDIT, over a 20-year period for unprotected EDIT associated with Property, Plant and Equipment, over a five-year period for unprotected EDIT not associated with Property, Plant and Equipment and over a three-year period for the deferred revenues; and

•Approval of a $12 million increase due to the expiration of EDIT related to reductions in the North Carolina state income tax rate from 6.9% to 2.5%.

As a result of the order, revised customer rates were effective June 1, 2019. On May 31, 2019, Duke Energy Progress filed a Petition for Rehearing or Reconsideration of that order contending substantial rights of Duke Energy Progress were prejudiced by unlawful, arbitrary and capricious rulings by the PSCSC on certain issues presented in the proceeding. On June 19, 2019, the PSCSC issued a Directive denying Duke Energy Progress' request to rehear or reconsider the commission's rulings on certain issues presented in the proceeding including coal ash remediation and disposal costs, ROE and the recovery of a return on deferred operation and maintenance expenses, but allowing additional litigation-related costs. As a result of the Directive allowing litigation-related costs, customer rates were revised effective July 1, 2019. An order detailing the commission's decision in the Directive was issued on October 18, 2019. Duke Energy Progress filed a notice of appeal on November 15, 2019, with the Supreme Court of South Carolina. Initial briefs were filed on April 21, 2020. Response briefs were filed on July 6, 2020, and reply briefs were filed on August 11, 2020. Oral arguments were heard before the Supreme Court of South Carolina on May 26, 2021.

On October 27, 2021, the Supreme Court of South Carolina affirmed the PSCSC's May 2019 order to:

•Disallow cost recovery on certain CCR compliance costs the PSCSC deemed to be incremental to the federal CCR rules;

•Disallow recovery of certain coal ash litigation expenses; and

•Disallow a return on certain deferred expenses.

The Supreme Court's decision notes the prior determination made by the PSCSC that Duke Energy could submit coal ash costs for recovery that were not initially approved in the rate case order if such costs can be attributed to the CCR rules. As a result of the Court's opinion, Duke Energy Progress recognized a pretax charge of approximately $42 million to Impairment of assets and other charges, and a $6 million increase in Other income and expenses, net, in the Condensed Consolidated Statement of Operations for the three and nine months ended September 30, 2021, principally related to coal ash remediation at retired coal ash basin sites. Duke Energy Progress is evaluating whether to file a Petition for rehearing on the Supreme Court's decision. Petitions are due November 11, 2021, unless an extension is sought and granted.

Western Carolinas Modernization Plan

On October 8, 2018, Duke Energy Progress filed an application with the NCUC for a CPCN to construct the Hot Springs Microgrid Solar and Battery Storage Facility, which was approved with certain conditions on May 10, 2019. A hearing to update the NCUC on the status of the project was held on March 5, 2020. Construction began in May 2020 with commercial operation expected to begin in December 2021.

On July 27, 2020, Duke Energy Progress filed an application with the NCUC for a CPCN to construct the Woodfin Solar Facility, a 5-MW solar generating facility to be constructed on a closed landfill in Buncombe County. The expert hearing was held on November 18, 2020. The application was approved and a CPCN was granted by order of the NCUC on April 20, 2021. Construction began in April 2021 with an expected in-service date in March 2022.

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FINANCIAL STATEMENTS REGULATORY MATTERS

FERC Return on Equity Complaints

On October 11, 2019, North Carolina Eastern Municipal Power Agency (NCEMPA) filed a complaint at the FERC against Duke Energy Progress pursuant to Section 206 of the Federal Power Act (FPA), alleging that the 11% stated ROE component contained in the demand formula rate in the Full Requirements Power Purchase Agreement (FRPPA) between NCEMPA and Duke Energy Progress is unjust and unreasonable. On July 16, 2020, the FERC set this matter for hearing and settlement judge procedures and established a refund effective date of October 11, 2019. In its order setting the matter for settlement, the FERC allowed for the consideration of variations to the base transmission-related ROE methodology developed in its Order No. 569-A, through the introduction of “specific facts and circumstances” involving issues specific to the case. The parties reached a settlement in principle at a settlement conference on January 7, 2021, and filed a settlement package on March 10, 2021. The FERC Trial Staff filed comments in support of the settlement. On April 19, 2021, the Settlement Judge certified the settlement to the FERC as an uncontested settlement. The FERC approved the settlement on May 25, 2021, and Duke Energy Progress filed compliance documents on June 10, 2021. The FERC accepted the compliance filing on October 8, 2021.

On October 16, 2020, North Carolina Electric Membership Corporation (NCEMC) filed a complaint at the FERC against Duke Energy Progress pursuant to Section 206 of the FPA, alleging that the 11% stated ROE component in the demand formula rate in the Power Supply and Coordination Agreement between NCEMC and Duke Energy Progress is unjust and unreasonable. Under FPA Section 206, the earliest refund effective date that the FERC can establish is the date of the filing of the complaint. Duke Energy Progress responded to the complaint on November 20, 2020, seeking dismissal, demonstrating that the 11% ROE is just and reasonable for the service provided. The parties filed responsive pleadings and are awaiting an order from the FERC. Duke Energy Progress cannot predict the outcome of this matter.

Duke Energy Florida

2021 Settlement Agreement

On January 14, 2021, Duke Energy Florida filed a Settlement Agreement (the “2021 Settlement”) with the FPSC. The parties to the 2021 Settlement include Duke Energy Florida, the Office of Public Counsel (OPC), the Florida Industrial Power Users Group, White Springs Agricultural Chemicals, Inc. d/b/a PCS Phosphate and NUCOR Steel Florida, Inc. (collectively, the “Parties”).

Pursuant to the 2021 Settlement, the Parties agreed to a base rate stay-out provision that expires year-end 2024; however, Duke Energy Florida is allowed an increase to its base rates of an incremental $67 million in 2022, $49 million in 2023 and $79 million in 2024, subject to adjustment in the event of tax reform during the years 2021, 2022 and 2023. The Parties also agreed to an ROE band of 8.85% to 10.85% with a midpoint of 9.85% based on a capital structure of 53% equity and 47% debt. The ROE band can be increased by 25 basis points if the average 30-year U.S. Treasury rate increases 50 basis points or more over a six-month period in which case the midpoint ROE would rise from 9.85% to 10.10%. Duke Energy Florida will also be able to retain the DOE award of approximately $173 million for spent nuclear fuel, which is expected to be received in 2022, in order to mitigate customer rates over the term of the 2021 Settlement. In return, Duke Energy Florida will be able to recognize the $173 million into earnings from 2022 through 2024.

In addition to these terms, the 2021 Settlement contains provisions related to the accelerated depreciation of Crystal River Units 4-5, the approval of approximately $1 billion in future investments in new cost-effective solar power, the implementation of a new Electric Vehicle Charging Station Program and the deferral and recovery of costs in connection with the implementation of Duke Energy Florida’s Vision Florida program, which explores various emerging non-carbon emitting generation technology, distributed technologies and resiliency projects, among other things. The 2021 Settlement also resolves remaining unrecovered storm costs for Hurricane Dorian and Hurricane Michael.

The FPSC approved the 2021 Settlement on May 4, 2021, issuing an order on June 4, 2021. Revised customer rates will be effective January 1, 2022, with subsequent base rate increases effective January 1, 2023, and January 1, 2024.

Storm Restoration Cost Recovery

Duke Energy Florida filed a petition with the FPSC on April 30, 2019, to recover $223 million of estimated retail incremental storm restoration costs for Hurricane Michael, consistent with the provisions in the 2017 Settlement, and the FPSC approved the petition on June 11, 2019. The FPSC also approved allowing Duke Energy Florida to use the tax savings resulting from the Tax Act to recover these storm costs in lieu of implementing a storm surcharge. Approved storm costs are currently expected to be fully recovered by year-end 2021. On November 22, 2019, Duke Energy Florida filed a petition for approval of actual retail recoverable storm restoration costs related to Hurricane Michael in the amount of $191 million plus interest. On May 19, 2020, Duke Energy Florida filed a supplemental true up reducing the actual retail recoverable storm restoration costs related to Hurricane Michael by approximately $3 million, resulting in a total request to recover $188 million actual retail recoverable storm restoration costs, plus interest. Approximately $80 million of these costs are included in Regulatory assets within Current Assets and Other Noncurrent Assets on the Condensed Consolidated Balance Sheets as of December 31, 2020.

Duke Energy Florida filed a petition with the FPSC on December 19, 2019, to recover $169 million of estimated retail incremental storm restoration costs for Hurricane Dorian, consistent with the provisions in the 2017 Settlement and the FPSC approved the petition on February 24, 2020. The final actual amount of $145 million was filed on September 30, 2020. The 2021 Settlement resolved all matters regarding storm cost recovery relating to Hurricane Michael and Hurricane Dorian.

Clean Energy Connection

On July 1, 2020, Duke Energy Florida petitioned the FPSC for approval of a voluntary solar program. The program consists of 10 new solar generating facilities with combined capacity of approximately 750 MW. The program allows participants to support cost-effective solar development in Florida by paying a subscription fee based on per kilowatt-subscriptions and receiving a credit on their bill based on the actual generation associated with their portion of the solar portfolio. The estimated cost of the 10 new solar generation facilities is approximately $1 billion over the next four years, and this investment will be included in base rates offset by the revenue from the subscription fees. The credits will be included for recovery in the fuel cost recovery clause. A remote hearing was held on November 17, 2020, and post-hearing briefs were filed with the FPSC from all parties by December 9, 2020. The FPSC voted to approve the program on January 5, 2021, and issued its written order on January 26, 2021.

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FINANCIAL STATEMENTS REGULATORY MATTERS

On February 24, 2021, the League of United Latin American Citizens (LULAC) filed a notice of appeal of the FPSC’s order approving the Clean Energy Connection to the Supreme Court of Florida. LULAC's initial brief was filed on May 26, 2021, and Appellees' response briefs were filed on July 26, 2021. LULAC's reply brief was filed on September 24, 2021, and its request for oral argument was filed on September 28, 2021. The FPSC approval order remains in effect pending the outcome of the appeal. Duke Energy Florida cannot predict the outcome of this matter.

Duke Energy Ohio

Duke Energy Ohio Electric Base Rate Case

Duke Energy Ohio filed with the PUCO an electric distribution base rate case application on October 1, 2021, with supporting testimony filed on October 15, 2021, requesting an increase in electric distribution base rates of approximately $55 million and an ROE of 10.3%. This is an approximate 3.3% average increase across all customer classes. The drivers for this case are capital invested since Duke Energy Ohio's last electric distribution base rate case in 2017. Duke Energy Ohio is also seeking to adjust the caps on its Distribution Capital Investment Rider (DCI Rider). Duke Energy Ohio anticipates the PUCO will rule on the request by the summer of 2022. Duke Energy Ohio cannot predict the outcome of this matter.

Ohio House Bill 6

On July 23, 2019, House Bill 6 was signed into law and became effective January 1, 2020. Among other things, the bill allows for funding, through a rider mechanism referred to as the Clean Air Fund (Rider CAF), of two nuclear generating facilities located in Northern Ohio owned by Energy Harbor (f/k/a FirstEnergy Solutions) and certain renewable resources, repeal of energy efficiency mandates and recovery of prudently incurred costs, net of any revenues, for Ohio investor-owned utilities that are participants under the OVEC power agreement. The OVEC recovery is through a non-bypassable rider that replaced any existing recovery mechanism approved by the PUCO and will remain in place through 2030. As such, Duke Energy Ohio created the Legacy Generation Rider (Rider LGR) that replaced Rider PSR effective January 1, 2020. The amounts recoverable from customers are subject to an annual cap, with incremental costs that exceed such cap eligible for deferral and recovery subject to review. See Note 11 for additional discussion of Duke Energy Ohio's ownership interest in OVEC. House Bill 128 was signed into law on March 31, 2021, and became effective June 30, 2021. The bill removes nuclear plant funding included in HB 6, eliminates Rider CAF and establishes the Solar Generation Fund Rider (Rider SGF) to recover the renewable investments originally included in HB 6. HB 128 does not impact OVEC cost recovery or any transmission or distribution rider.

Energy Efficiency Cost Recovery

On February 26, 2020, the PUCO issued an order directing utilities to wind down their demand-side management programs by September 30, 2020, and to terminate the programs by December 31, 2020, in response to changes in Ohio law that eliminated Ohio's energy efficiency mandates. On March 27, 2020, Duke Energy Ohio filed an Application for Rehearing seeking clarification on the final true up and reconciliation process after 2020. On November 18, 2020, the PUCO issued two orders on the application for rehearing. The first order was a Third Entry on Rehearing on the Duke Energy Ohio portfolio holding the cost cap previously imposed was unlawful, a shared savings cap of $8 million pretax should be imposed and lost distribution revenues could not be recovered after December 31, 2020. The second order directs all utilities set the rider to zero effective January 1, 2021, and to file a separate application for final reconciliation of all energy efficiency costs prior to December 31, 2020. On December 18, 2020, Duke Energy Ohio filed an application for rehearing. On January 13, 2021, the application for rehearing was granted for further consideration. Duke Energy Ohio cannot predict the outcome of this matter.

On October 9, 2020, Duke Energy Ohio filed an application to implement a voluntary energy efficiency program portfolio to commence on January 1, 2021. The application proposes a mechanism for recovery of program costs and a benefit associated with avoided transmission and distribution costs. The application remains under review. Effective January 1, 2021, Duke Energy Ohio suspended its energy efficiency programs due to changes in Ohio law. On June 14, 2021, the PUCO issued an entry for each utility to file by July 15, 2021, a proposal to reestablish low-income programs through December 31, 2021. Duke Energy Ohio filed its application on July 14, 2021. Duke Energy Ohio cannot predict the outcome of this matter.

Natural Gas Pipeline Extension

Duke Energy Ohio is installing a new natural gas pipeline (the Central Corridor Project) in its Ohio service territory to increase system reliability and enable the retirement of older infrastructure. Duke Energy Ohio currently estimates the pipeline development costs and construction activities will range from $185 million to $205 million in direct costs (excluding overheads and AFUDC) and that construction of the pipeline extension will be completed in time for use during the 2021/2022 winter season. An evidentiary hearing on Duke Energy Ohio's application for a Certificate of Environmental Compatibility and Public Need concluded on April 11, 2019. On November 21, 2019, the Ohio Power Siting Board (OPSB) approved Duke Energy Ohio's application subject to 41 conditions on construction. Applications for rehearing were filed by several stakeholders on December 23, 2019, arguing that the OPSB approval was incorrect. On February 20, 2020, the OPSB denied the rehearing requests. On April 15, 2020, those stakeholders filed a notice of appeal at the Supreme Court of Ohio of the OPSB’s decision approving Duke Energy Ohio’s Central Corridor project application. The Ohio Supreme Court affirmed the OPSB order on September 22, 2021.

On September 22, 2020, Duke Energy Ohio filed an application with the OPSB for approval to amend the certificated pipeline route due to changes in the route negotiated with property owners and municipalities. On January 21, 2021, the OPSB approved the amended filing with recommended conditions that reaffirm previous conditions and provide guidance regarding local permitting and construction supervision.

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FINANCIAL STATEMENTS REGULATORY MATTERS

MGP Cost Recovery

In an order issued in 2013, the PUCO approved Duke Energy Ohio's deferral and recovery of costs related to environmental remediation at two sites (East End and West End) that housed former MGP operations. Duke Energy Ohio has collected approximately $55 million in environmental remediation costs incurred between 2008 through 2012 through Rider MGP, which is currently suspended. Duke Energy Ohio has made annual applications with the PUCO to recover its incremental remediation costs consistent with the PUCO’s directive in Duke Energy Ohio’s 2012 natural gas base rate case. To date, the PUCO has not ruled on Duke Energy Ohio’s annual applications for the calendar years 2013 through 2019. On September 28, 2018, the Staff of the PUCO (Staff) issued a report recommending a disallowance of approximately $12 million of the $26 million in MGP remediation costs incurred between 2013 through 2017 that Staff believes are not eligible for recovery. Staff interprets the PUCO’s 2013 order granting Duke Energy Ohio recovery of MGP remediation as limiting the recovery to work directly on the East End and West End sites. On October 30, 2018, Duke Energy Ohio filed reply comments objecting to the Staff’s recommendations and explaining, among other things, the obligation Duke Energy Ohio has under Ohio law to remediate all areas impacted by the former MGPs and not just physical property that housed the former plants and equipment. On March 29, 2019, Duke Energy Ohio filed its annual application to recover incremental remediation expense for the calendar year 2018 seeking recovery of approximately $20 million in remediation costs. On July 12, 2019, the Staff recommended a disallowance of approximately $11 million for work that the Staff believes occurred in areas not authorized for recovery. Additionally, the Staff recommended that any discussion pertaining to Duke Energy Ohio's recovery of ongoing MGP costs should be directly tied to or netted against insurance proceeds collected by Duke Energy Ohio. An evidentiary hearing concluded on November 21, 2019. Initial briefs were filed on January 17, 2020, and reply briefs were filed on February 14, 2020.

On March 31, 2020, Duke Energy Ohio filed its annual application to recover incremental MGP remediation expense, seeking recovery of approximately $39 million in remediation costs incurred during 2019. On July 23, 2020, the Staff recommended a disallowance of approximately $4 million for work the Staff believes occurred in areas not authorized for recovery. Additionally, the Staff recommended insurance proceeds, net of litigation costs and attorney fees, should be paid to customers and not be held by Duke Energy Ohio until all investigation and remediation is complete. Duke Energy Ohio filed comments in response to the Staff report on August 21, 2020, and intervenor comments were filed on November 9, 2020.

The 2013 PUCO order also contained conditional deadlines for completing the MGP environmental remediation and the deferral of related remediation costs. Subsequent to the order, the deadline was extended to December 31, 2019. On May 10, 2019, Duke Energy Ohio filed an application requesting a continuation of its existing deferral authority for MGP remediation that must occur after December 31, 2019. On July 12, 2019, the Staff recommended the commission deny the deferral authority request. On September 13, 2019, intervenor comments were filed opposing Duke Energy Ohio's request for continuation of existing deferral authority and on October 2, 2019, Duke Energy Ohio filed reply comments.

A Stipulation and Recommendation was filed jointly by Duke Energy Ohio, the Staff, the Office of the Ohio Consumers' Counsel and the Ohio Energy Group on August 31, 2021, which is subject to review and approval by the PUCO. If approved, the Stipulation and Recommendation would, among other things, resolve all open issues regarding MGP remediation costs incurred between 2013 and 2019, including Duke Energy Ohio’s request for additional deferral authority beyond 2019, and the pending issues related to the Tax Act as it relates to Duke Energy Ohio’s natural gas operations. These impacts are not expected to have a material impact on the Duke Energy Ohio financial statements. The Stipulation and Recommendation further acknowledges Duke Energy Ohio’s ability to file a request for additional deferral authority in the future related to environmental remediation of any MGP impacts in the Ohio River if necessary, subject to specific conditions. On October 15, 2021, the PUCO granted motions to intervene filed in September 2021 by Interstate Gas Supply, Inc. and Retail Energy Supply Association on a limited basis. An evidentiary hearing is scheduled for November 22, 2021. Duke Energy Ohio cannot predict the outcome of this matter.

Tax Act – Ohio

On December 21, 2018, Duke Energy Ohio filed an application to change its base rate tariffs and establish a new rider to implement the benefits of the Tax Act for natural gas customers. Duke Energy Ohio requested commission approval to implement the tariff changes and rider effective April 1, 2019. The new rider will flow through to customers the benefit of the reduction in the statutory federal tax rate from 35% to 21% since January 1, 2018, all future benefits of the lower tax rates and a full refund of deferred income taxes collected at the higher tax rates in prior years. Deferred income taxes subject to normalization rules will be refunded consistent with federal law and deferred income taxes not subject to normalization rules will be refunded over a 10-year period. The PUCO established a procedural schedule and testimony was filed on July 31, 2019. An evidentiary hearing occurred on August 7, 2019. Initial briefs were filed on September 11, 2019. Reply briefs were filed on September 25, 2019. The Stipulation and Recommendation filed on August 31, 2021, disclosed in the MGP Cost Recovery matter above, also resolves the outstanding issues in this proceeding. On October 15, 2021, the PUCO granted motions to intervene filed in September 2021 by Interstate Gas Supply, Inc. and Retail Energy Supply Association on a limited basis. An evidentiary hearing is scheduled for November 22, 2021. Duke Energy Ohio cannot predict the outcome of this matter.

Duke Energy Kentucky Natural Gas Base Rate Case

On June 1, 2021, Duke Energy Kentucky filed an application with the KPSC requesting an increase in natural gas base rates of approximately $15 million, an approximate 13% average increase across all customer classes. The drivers for this case are capital invested since Duke Energy Kentucky's last natural gas base rate case in 2018. Duke Energy Kentucky is also seeking implementation of a Governmental Mandate Adjustment mechanism (Rider GMA) in order to recover from or pay to customers the financial impact of governmental directives and mandates, including changes in federal or state tax rates and regulations issued by the Pipeline and Hazardous Materials Safety Administration (PHMSA). On October 8, 2021, Duke Energy Kentucky filed a Stipulation and Recommendation jointly with the Kentucky Attorney General, subject to review and approval by the KPSC, which if approved, would resolve the case. The Stipulation and Recommendation includes a $9 million increase in base revenues, an ROE of 9.375% for natural gas base rates and 9.3% for natural gas riders, a rider for PHMSA-required capital investments with an annual 5% rate increase cap and a four-year natural gas base rate case stay-out. The hearing was held on October 18, 2021. Duke Energy Kentucky anticipates the KPSC will rule on the request by the end of 2021. Duke Energy Kentucky cannot predict the outcome of this matter.

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FINANCIAL STATEMENTS REGULATORY MATTERS

Midwest Propane Caverns

Duke Energy Ohio uses propane stored in caverns to meet peak demand during winter. Once the Central Corridor Project is complete, the propane peaking facilities will no longer be necessary and will be retired. On October 7, 2021, Duke Energy Ohio requested deferral treatment of the property, plant and equipment as well as costs related to propane inventory and decommissioning costs. There is approximately $27 million in Property, Plant and Equipment on the Condensed Consolidated Balance Sheets as of September 30, 2021, and December 31, 2020, related to the propane caverns. Duke Energy Ohio cannot predict the outcome of this matter.

Duke Energy Indiana

2019 Indiana Rate Case

On July 2, 2019, Duke Energy Indiana filed a general rate case with the IURC for a rate increase for retail customers of approximately $395 million. The rebuttal case, filed on December 4, 2019, updated the requested revenue requirement to result in a 15.6% or $396 million average retail rate increase, including the impacts of the Utility Receipts Tax. Hearings concluded on February 7, 2020. On June 29, 2020, the IURC issued an order in the rate case approving a revenue increase of $146 million before certain adjustments and ratemaking refinements. The order approved Duke Energy Indiana’s requested forecasted rate base of $10.2 billion as of December 31, 2020, including the Edwardsport Integrated Gasification Combined Cycle (IGCC) Plant. The IURC reduced Duke Energy Indiana’s request by slightly more than $200 million, when accounting for the utility receipts tax and other adjustments. Approximately 50% of the reduction was due to a prospective change in depreciation and use of regulatory asset for the end-of-life inventory at retired generating plants, approximately 20% was due to the approved ROE of 9.7% versus the requested ROE of 10.4% and approximately 20% was related to miscellaneous earnings neutral adjustments. Step one rates were estimated to be approximately 75% of the total and became effective on July 30, 2020. Step two rates are estimated to be the remaining 25% of the total rate increase. Step two rates were approved July 28, 2021, and implemented in August 2021. Step two rates are based on a return on equity of 9.7% and actual December 31, 2020 capital structure with a 54% equity component. Step two rates will be reconciled to January 1, 2021. Several groups appealed the IURC order to the Indiana Court of Appeals. Appellate briefs were filed on October 14, 2020, focusing on three issues: wholesale sales allocations, coal ash basin cost recovery and the Edwardsport IGCC operating and maintenance expense level approved. The appeal was fully briefed in January 2021 and an oral argument was held on April 8, 2021. The Indiana Court of Appeals affirmed the IURC decision on May 13, 2021. The Indiana Office of Utility Consumer Counselor (OUCC) and the Duke Industrial Group filed a joint petition to transfer the rate case appeal to the Indiana Supreme Court on June 28, 2021. Response briefs were filed July 19, 2021. The Indiana Supreme Court granted the petition to transfer on September 16, 2021, and scheduled oral argument for November 16, 2021. Duke Energy Indiana cannot predict the outcome of this matter.

2020 Indiana Coal Ash Recovery Case

In Duke Energy Indiana’s 2019 rate case, the IURC approved coal ash basin closure costs expended through 2018 including financing costs as a regulatory asset and included in rate base. The IURC also opened a subdocket for post-2018 coal ash related expenditures. Duke Energy Indiana filed testimony on April 15, 2020, in the coal ash subdocket requesting recovery for the post-2018 coal ash basin closure costs for plans that have been approved by the Indiana Department of Environmental Management (IDEM) as well as continuing deferral, with carrying costs, on the balance. An evidentiary hearing was held on September 14, 2020. Briefing was completed by mid-September 2021. On November 3, 2021, the IURC issued an order allowing recovery for post-2018 coal ash basin closure costs for the plans that have been approved by IDEM, as well as continuing deferral, with carrying costs, on the balance. The IURC order is subject to appeal within 30 days to the IURC or the Indiana Court of Appeals. Duke Energy Indiana cannot predict the outcome of this matter.

Piedmont

2020 Tennessee Rate Case

On July 2, 2020, Piedmont filed an application with the TPUC, its first general rate case in Tennessee in nine years, for a rate increase for retail customers of approximately $30 million, which represents an approximate 15% increase in annual revenues. The rate increase is driven by significant infrastructure upgrade investments since Piedmont's previous rate case. Approximately half of the plant additions being added to rate base are categories of capital investment not covered under the IMR mechanism, which was approved in 2013. Piedmont amended its requested increase to approximately $26 million in December 2020. As authorized under Tennessee law, Piedmont implemented interim rates on January 2, 2021, at the level requested in its adjusted request. A settlement reached with the Tennessee Consumer Advocate in mid-January was filed with the TPUC on February 2, 2021. The settlement results in an increase of revenues of approximately $16 million and an ROE of 9.8%. On May 6, 2021, the TPUC issued an order approving the settlement. Revised customer rates became effective January 2, 2021. Piedmont refunded customers the difference between bills previously rendered under interim rates and such bills if rendered under approved rates, plus interest, in April 2021.

2021 North Carolina Rate Case

On March 22, 2021, Piedmont filed an application with the NCUC for a rate increase for retail customers of approximately $109 million, which represents an approximate 10% increase in retail revenues. The rate increase is driven by customer growth and significant infrastructure upgrade investments (plant additions) since the last general rate case. Approximately 70% of the plant additions being rolled into rate base are categories of plant investment not covered under the IMR mechanism, which was originally approved as part of the 2013 North Carolina Rate Case. On July 28, 2021, Piedmont amended its requested increase to approximately $97 million.

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FINANCIAL STATEMENTS REGULATORY MATTERS

On September 7, 2021, Piedmont and the Public Staff, the Carolina Utility Customers Association, Inc. and the Carolina Industrial Group for Fair Utility Rates IV filed a Stipulation of Partial Settlement (Stipulation), which is subject to review and approval by the NCUC, resolving most issues between these parties. Major components of the Stipulation include:

•A return on equity of 9.6% and a capital structure of 51.6% equity and 48.4% debt;

•Continuation of the IMR mechanism and margin decoupling; and

•A revenue increase of $67 million, subject to completion of the Robeson County LNG facility and the Pender Onslow County expansion project.

An evidentiary hearing to review the Stipulation and other issues concluded on September 9, 2021. On October 12, 2021, Piedmont notified the NCUC of its intent to implement the stipulated rates effective November 1, 2021, on a temporary basis and subject to refund. On October 18, 2021, Piedmont and the Public Staff filed supplemental testimony attesting to the completion of the Robeson County LNG facility and the Pender Onslow County expansion project and to the propriety of including the capital investment for these two projects in this proceeding. Piedmont cannot predict the outcome of this matter.

OTHER REGULATORY MATTERS

Atlantic Coast Pipeline, LLC

Atlantic Coast Pipeline (ACP pipeline) was planned to be an approximately 600-mile interstate natural gas pipeline running from West Virginia to North Carolina. Duke Energy indirectly owns a 47% interest, which is accounted for as an equity method investment through its Gas Utilities and Infrastructure segment.

As a result of the uncertainty created by various legal rulings, the potential impact on the cost and schedule for the project, the ongoing legal challenges and the risk of additional legal challenges and delays through the construction period and Dominion’s decision to sell substantially all of its gas transmission and storage segment assets, Duke Energy's Board of Directors and management decided that it was not prudent to continue to invest in the project. On July 5, 2020, Duke Energy and Dominion announced the cancellation of the ACP pipeline project.

As part of the pretax charges to earnings of approximately $2.1 billion recorded in June 2020, within Equity in (losses) earnings of unconsolidated affiliates on the Duke Energy Condensed Consolidated Statements of Operations, Duke Energy established liabilities related to the cancellation of the ACP pipeline project. In February 2021, Duke Energy paid approximately $855 million to fund ACP's outstanding debt, relieving Duke Energy of its guarantee. At September 30, 2021, there is $36 million and $63 million within Other Current Liabilities and Other Noncurrent Liabilities, respectively, in the Gas Utilities and Infrastructure segment. The liabilities represent Duke Energy's obligation of approximately $99 million to satisfy remaining ARO requirements to restore construction sites.

See Notes 1 and 11 for additional information regarding this transaction.

Potential Coal Plant Retirements

The Subsidiary Registrants periodically file IRPs with their state regulatory commissions. The IRPs provide a view of forecasted energy needs over a long term (10 to 20 years) and options being considered to meet those needs. IRPs filed by the Subsidiary Registrants included planning assumptions to potentially retire certain coal-fired generating facilities in North Carolina and Indiana earlier than their current estimated useful lives. Duke Energy continues to evaluate the potential need to retire these coal-fired generating facilities earlier than the current estimated useful lives and plans to seek regulatory recovery for amounts that would not be otherwise recovered when any of these assets are retired.

The table below contains the net carrying value of generating facilities planned for retirement or included in recent IRPs as evaluated for potential retirement. Dollar amounts in the table below are included in Net property, plant and equipment on the Condensed Consolidated Balance Sheets as of September 30, 2021, and exclude capitalized asset retirement costs.

		Remaining Net
	Capacity	Book Value
	(in MW)	(in millions)
Duke Energy Carolinas
Allen Steam Station Units 1-2(a)	324	$	19
Allen Steam Station Units 4-5(b)	516	362
Cliffside Unit 5(b)	544	367
Duke Energy Progress
Mayo Unit 1(b)	704	640
Roxboro Units 3-4(b)	1,392	465
Duke Energy Florida
Crystal River Units 4-5(c)	1,410	1,658
Duke Energy Indiana (d)
Gibson Units 1-5(e)	2,822	1,814
Cayuga Units 1-2(e)	995	713
Total Duke Energy	8,707	$	6,038

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FINANCIAL STATEMENTS REGULATORY MATTERS

(a)As part of the 2015 resolution of a lawsuit involving alleged New Source Review violations, Duke Energy Carolinas must retire Allen Steam Station Units 1 through 3 by December 31, 2024. The long-term energy options considered in the IRP could result in retirement of these units earlier than their current estimated useful lives. Unit 3 with a capacity of 270 MW and a net book value of $26 million at December 31, 2020, was retired in March 2021.

(b)These units were included in the IRP filed by Duke Energy Carolinas and Duke Energy Progress in North Carolina and South Carolina on September 1, 2020. The long-term energy options considered in the IRP could result in retirement of these units earlier than their current estimated useful lives. In 2019, Duke Energy Carolinas and Duke Energy Progress filed North Carolina rate cases that included depreciation studies that accelerate end-of-life dates for these plants. The NCUC issued orders in the 2019 rate cases of Duke Energy Carolinas and Duke Energy Progress on March 31, 2021, and April 16, 2021, respectively, in which the proposals to shorten the remaining depreciable lives of these units were denied, while indicating the IRP proceeding was the appropriate proceeding for the review of generating plant retirements.

(c)On January 14, 2021, Duke Energy Florida filed a settlement agreement with the FPSC, which proposed depreciation rates reflecting retirement dates for Duke Energy Florida's last two coal-fired generating facilities, Crystal River Units 4-5, eight years ahead of schedule in 2034 rather than in 2042. The settlement was approved by the FPSC on May 4, 2021.

(d)Gallagher Units 2 and 4 with a total capacity of 280 MW and a total net book value of $102 million at December 31, 2020, were retired on June 1, 2021.

(e)The rate case filed July 2, 2019, included proposed depreciation rates reflecting retirement dates from 2026 to 2038. The depreciation rates reflecting these updated retirement dates were approved by the IURC as part of the rate case order issued on June 29, 2020.

4. COMMITMENTS AND CONTINGENCIES

ENVIRONMENTAL

The Duke Energy Registrants are subject to federal, state and local regulations regarding air and water quality, hazardous and solid waste disposal, coal ash and other environmental matters. These regulations can be changed from time to time, imposing new obligations on the Duke Energy Registrants. The following environmental matters impact all Duke Energy Registrants.

Remediation Activities

In addition to AROs recorded as a result of various environmental regulations, the Duke Energy Registrants are responsible for environmental remediation at various sites. These include certain properties that are part of ongoing operations and sites formerly owned or used by Duke Energy entities. These sites are in various stages of investigation, remediation and monitoring. Managed in conjunction with relevant federal, state and local agencies, remediation activities vary based upon site conditions and location, remediation requirements, complexity and sharing of responsibility. If remediation activities involve joint and several liability provisions, strict liability, or cost recovery or contribution actions, the Duke Energy Registrants could potentially be held responsible for environmental impacts caused by other potentially responsible parties and may also benefit from insurance policies or contractual indemnities that cover some or all cleanup costs. Liabilities are recorded when losses become probable and are reasonably estimable. The total costs that may be incurred cannot be estimated because the extent of environmental impact, allocation among potentially responsible parties, remediation alternatives and/or regulatory decisions have not yet been determined at all sites. Additional costs associated with remediation activities are likely to be incurred in the future and could be significant. Costs are typically expensed as Operation, maintenance and other on the Condensed Consolidated Statements of Operations unless regulatory recovery of the costs is deemed probable.

The following table contains information regarding reserves for probable and estimable costs related to the various environmental sites. These reserves are recorded in Other within Other Noncurrent Liabilities on the Condensed Consolidated Balance Sheets.

(in millions)	September 30, 2021		December 31, 2020
Reserves for Environmental Remediation
Duke Energy	$	74	$	75
Duke Energy Carolinas	19		19
Progress Energy	17		19
Duke Energy Progress	6		6
Duke Energy Florida	11		12
Duke Energy Ohio	21		22
Duke Energy Indiana	5		6
Piedmont	12		10

Additional losses in excess of recorded reserves that could be incurred for the stages of investigation, remediation and monitoring for environmental sites that have been evaluated at this time are not material.

LITIGATION

Duke Energy

Texas Storm Uri Tort Litigation

Duke Energy and several Duke Energy renewables project companies have been named in multiple lawsuits arising out of Texas Storm Uri in mid-February 2021, and particularly, in the deregulated market managed by the Electric Reliability Council of Texas. There are 30 state court actions pending. These lawsuits seek recovery for property damages, personal injury and for wrongful death allegedly incurred by the plaintiffs as a result of power outages, which the plaintiffs claim was the result of the defendants' failures. The cases pending in state court have been consolidated into a Texas state court multidistrict litigation proceeding before a single judge to handle all pretrial coordination. Duke Energy cannot predict the outcomes of these matters.

59

FINANCIAL STATEMENTS COMMITMENTS AND CONTINGENCIES

Duke Energy Carolinas and Duke Energy Progress

Coal Ash Insurance Coverage Litigation

In March 2017, Duke Energy Carolinas and Duke Energy Progress filed a civil action in the North Carolina Business Court against various insurance providers. The lawsuit seeks payment for coal ash related liabilities covered by third-party liability insurance policies. The insurance policies were issued between 1971 and 1986 and provide third-party liability insurance for property damage. The civil action seeks damages for breach of contract and indemnification for costs arising from the Coal Ash Act and the U.S. Environmental Protection Agency CCR rule at 15 coal-fired plants in North Carolina and South Carolina.

Duke Energy Carolinas and Duke Energy Progress have resolved claims against all, but two of the insurers, sued in this litigation and are dismissing their claims against the settling insurers. Duke Energy Carolinas and Duke Energy Progress have received approximately $418 million of coal ash insurance litigation proceeds from settlements with insurer-defendants and these proceeds will be distributed in accordance with the terms of the CCR settlement agreement. The companies are assessing their options with regard to the two remaining foreign insurers that have defaulted. Duke Energy Carolinas and Duke Energy Progress cannot predict the outcome of this matter.

Duke Energy Carolinas

Ruben Villano, et al. v. Duke Energy Carolinas, LLC

On June 16, 2021, a group of nine individuals went over a low head dam adjacent to the Dan River Steam Station in Eden, North Carolina, while water tubing. Emergency personnel rescued four people and five others were confirmed deceased. On August 11, 2021, Duke Energy Carolinas was served with the complaint filed in Durham County Superior Court on behalf of four survivors, which was later amended to include all the decedents along with the survivors. The lawsuit alleges that Duke Energy Carolinas knew that the river was used for recreational purposes and that Duke Energy did not adequately warn about the dam. On September 30, 2021, Duke Energy Carolinas filed its Motion to Dismiss and Motion for Transfer of Venue from Durham County to Rockingham County. A hearing on these motions is set for November 15, 2021, and discovery has commenced. Duke Energy Carolinas cannot predict the outcome of this matter.

NTE Carolinas II, LLC Litigation

In November 2017, Duke Energy Carolinas entered into a standard FERC large generator interconnection agreement (LGIA) with NTE Carolinas II, LLC (NTE), a company that proposed to build a combined-cycle natural gas plant in Rockingham County, North Carolina. On September 6, 2019, Duke Energy Carolinas filed a lawsuit in Mecklenburg County Superior Court against NTE for breach of contract, alleging that NTE's failure to pay benchmark payments for Duke Energy Carolinas' transmission system upgrades required under the interconnection agreement constituted a termination of the interconnection agreement. Duke Energy Carolinas is seeking a monetary judgment against NTE because NTE failed to make multiple milestone payments. The lawsuit was moved to federal court in North Carolina. NTE filed a motion to dismiss Duke Energy Carolinas’ complaint and brought counterclaims alleging anti-competitive conduct and violations of state and federal statutes. Duke Energy Carolinas filed a motion to dismiss NTE's counterclaims.

On May 21, 2020, in response to a NTE petition challenging Duke Energy Carolinas' termination of the LGIA, FERC issued a ruling that 1) it has exclusive jurisdiction to determine whether a transmission provider may terminate a LGIA; 2) FERC approval is required to terminate a conforming LGIA if objected to by the interconnection customer; and 3) Duke Energy may not announce the termination of a conforming LGIA unless FERC has approved the termination. FERC's Office of Enforcement also initiated an investigation of Duke Energy Carolinas into matters pertaining to the LGIA. Duke Energy Carolinas is cooperating with the Office of Enforcement but cannot predict the outcome of this investigation.

On August 17, 2020, the court denied both NTE’s and Duke Energy Carolinas’ Motion to Dismiss. The parties are in active discovery and trial is scheduled for June 20, 2022. Duke Energy Carolinas cannot predict the outcome of this matter.

Asbestos-related Injuries and Damages Claims

Duke Energy Carolinas has experienced numerous claims for indemnification and medical cost reimbursement related to asbestos exposure. These claims relate to damages for bodily injuries alleged to have arisen from exposure to or use of asbestos in connection with construction and maintenance activities conducted on its electric generation plants prior to 1985. As of September 30, 2021, there were 74 asserted claims for non-malignant cases with cumulative relief sought of up to $15 million, and 58 asserted claims for malignant cases with cumulative relief sought of up to $21 million. Based on Duke Energy Carolinas’ experience, it is expected that the ultimate resolution of most of these claims likely will be less than the amount claimed.

Duke Energy Carolinas has recognized asbestos-related reserves of $508 million at September 30, 2021, and $572 million at December 31, 2020. These reserves are classified in Other within Other Noncurrent Liabilities and Other within Current Liabilities on the Condensed Consolidated Balance Sheets. These reserves are based upon Duke Energy Carolinas' best estimate for current and future asbestos claims through 2041 and are recorded on an undiscounted basis. In light of the uncertainties inherent in a longer-term forecast, management does not believe they can reasonably estimate the indemnity and medical costs that might be incurred after 2041 related to such potential claims. It is possible Duke Energy Carolinas may incur asbestos liabilities in excess of the recorded reserves.

Duke Energy Carolinas has third-party insurance to cover certain losses related to asbestos-related injuries and damages above an aggregate self-insured retention. Duke Energy Carolinas’ cumulative payments began to exceed the self-insured retention in 2008. Future payments up to the policy limit will be reimbursed by the third-party insurance carrier. The insurance policy limit for potential future insurance recoveries indemnification and medical cost claim payments is $697 million in excess of the self-insured retention. Receivables for insurance recoveries were $644 million at September 30, 2021, and $704 million at December 31, 2020. These amounts are classified in Other within Other Noncurrent Assets and Receivables within Current Assets on the Condensed Consolidated Balance Sheets. Duke Energy Carolinas is not aware of any uncertainties regarding the legal sufficiency of insurance claims. Duke Energy Carolinas believes the insurance recovery asset is probable of recovery as the insurance carrier continues to have a strong financial strength rating.

60

FINANCIAL STATEMENTS COMMITMENTS AND CONTINGENCIES

As described in Note 1, Duke Energy adopted the new guidance for credit losses effective January 1, 2020, using the modified retrospective method of adoption, which does not require restatement of prior year reported results. The reserve for credit losses for insurance receivables based on adoption of the new standard is $15 million for Duke Energy and Duke Energy Carolinas as of September 30, 2021, and December 31, 2020. The insurance receivable is evaluated based on the risk of default and the historical losses, current conditions and expected conditions around collectability. Management evaluates the risk of default annually based on payment history, credit rating and changes in the risk of default from credit agencies.

Duke Energy Progress and Duke Energy Florida

Spent Nuclear Fuel Matters

On June 18, 2018, Duke Energy Progress and Duke Energy Florida sued the U.S. in the U.S. Court of Federal Claims for damages incurred for the period 2014 through 2018. The lawsuit claimed the Department of Energy breached a contract in failing to accept spent nuclear fuel under the Nuclear Waste Policy Act of 1982 and asserted damages for the cost of on-site storage in the amount of $100 million and $200 million for Duke Energy Progress and Duke Energy Florida, respectively. Discovery is now complete, and trial is anticipated to be scheduled in 2022. Duke Energy Progress and Duke Energy Florida cannot predict the outcome of this matter.

Duke Energy Florida

Power Purchase Dispute Arbitration

Duke Energy Florida, on behalf of its customers, entered into a PPA for the purchase of firm capacity and energy from a qualifying facility under the Public Utilities Regulatory Policies Act of 1978. Duke Energy Florida determined the qualifying facility did not perform in accordance with the PPA, and Duke Energy Florida terminated the PPA. The qualifying facility counterparty filed a confidential American Arbitration Association (AAA) arbitration demand, challenging the termination of the PPA and seeking damages.

The final arbitration hearing occurred during the week of December 7, 2020. An interim arbitral award was issued in March 2021, upholding Duke Energy Florida's positions on all issues and awarding the company termination costs. In May 2021, the final arbitral award was issued awarding Duke Energy Florida its claimed fees and costs. On August 18, 2021, Duke Energy Florida filed a motion in Florida state court to confirm the arbitral award.

Duke Energy Indiana

Coal Ash Basin Closure Plan Appeal

On January 27, 2020, Hoosier Environmental Council (HEC) filed a Petition for Administrative Review with the Indiana Office of Environmental Adjudication challenging the Indiana Department of Environmental Management’s (IDEM's) December 10, 2019, partial approval of Duke Energy Indiana’s ash pond closure plan. After hearing oral arguments in early April 2021 on Duke Energy Indiana's and HEC's competing Motions for Summary Judgment, on May 4, 2021, the administrative court rejected all of HEC’s claims and issued a ruling in favor of Duke Energy Indiana. On June 3, 2021, HEC filed an appeal in Superior Court to seek judicial review of the order. On June 25, 2021, Duke Energy Indiana filed its response to the Petition to Review. On August 30, 2021, HEC served Duke Energy Indiana with its Brief in Support of Petition for Judicial Review. On October 29, 2021, Duke Energy Indiana and IDEM filed their response briefs. HEC's Reply Brief is due on or before November 22, 2021. Oral argument will be heard in December 2021, in Marion County Superior Court. Duke Energy Indiana cannot predict the outcome of this matter.

Other Litigation and Legal Proceedings

The Duke Energy Registrants are involved in other legal, tax and regulatory proceedings arising in the ordinary course of business, some of which involve significant amounts. The Duke Energy Registrants believe the final disposition of these proceedings will not have a material effect on their results of operations, cash flows or financial position. Reserves are classified on the Condensed Consolidated Balance Sheets in Other within Other Noncurrent Liabilities and Other within Current Liabilities.

OTHER COMMITMENTS AND CONTINGENCIES

General

As part of their normal business, the Duke Energy Registrants are party to various financial guarantees, performance guarantees and other contractual commitments to extend guarantees of credit and other assistance to various subsidiaries, investees and other third parties. These guarantees involve elements of performance and credit risk, which are not fully recognized on the Condensed Consolidated Balance Sheets and have uncapped maximum potential payments. However, the Duke Energy Registrants do not believe these guarantees will have a material effect on their results of operations, cash flows or financial position.

In addition, the Duke Energy Registrants enter into various fixed-price, noncancelable commitments to purchase or sell power or natural gas, take-or-pay arrangements, transportation, or throughput agreements and other contracts that may or may not be recognized on their respective Condensed Consolidated Balance Sheets. Some of these arrangements may be recognized at fair value on their respective Condensed Consolidated Balance Sheets if such contracts meet the definition of a derivative and the NPNS exception does not apply. In most cases, the Duke Energy Registrants’ purchase obligation contracts contain provisions for price adjustments, minimum purchase levels and other financial commitments.

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FINANCIAL STATEMENTS DEBT AND CREDIT FACILITIES

5. DEBT AND CREDIT FACILITIES

SUMMARY OF SIGNIFICANT DEBT ISSUANCES

The following table summarizes significant debt issuances (in millions).

				Nine Months Ended September 30, 2021
						Duke		Duke		Duke
	Maturity	Interest		Duke		Energy		Energy		Energy
Issuance Date	Date	Rate		Energy		(Parent)		Carolinas		Progress		Piedmont
Unsecured Debt
March 2021(a)	March 2031	2.500	%	$	350	$	—	$	—	$	—	$	350
June 2021(b)(c)	June 2023	2.500	%	500		500		—		—		—
June 2021(c)	June 2031	2.550	%	1,000		1,000		—		—		—
June 2021(c)	June 2041	3.300	%	750		750		—		—		—
June 2021(c)	June 2051	3.500	%	750		750		—		—		—
September 2021(d)	January 2082	3.250	%	500		500		—		—		—
First Mortgage Bonds
April 2021(e)	April 2031	2.550	%	550		—		550		—		—
April 2021(e)	April 2051	3.450	%	450		—		450		—		—
August 2021(f)	August 2031	2.000	%	650		—		—		650		—
August 2021(f)	August 2051	2.900	%	450		—		—		450		—
Total issuances				$	5,950	$	3,500	$	1,000	$	1,100	$	350

(a)Debt issued to repay at maturity $160 million senior unsecured notes due June 2021, pay down short-term debt and for general corporate purposes.

(b)Debt issuance has a floating interest rate.

(c)Debt issued to repay $1.75 billion of Duke Energy (Parent) 2021 debt maturities, to repay a portion of short-term debt and for general corporate purposes.

(d)Debt issued to repay in October 2021 $500 million of Duke Energy (Parent) unsecured notes. The interest rate resets every five years.

(e)Debt issued to repay at maturity $500 million first mortgage bonds due June 2021, pay down short-term debt and for general company purposes.

(f)Debt issued to repay at maturity a total of $600 million first mortgage bonds due September 2021, pay down short-term debt and for general company purposes.

CURRENT MATURITIES OF LONG-TERM DEBT

The following table shows the significant components of Current maturities of long-term debt on the Condensed Consolidated Balance Sheets. The Duke Energy Registrants currently anticipate satisfying these obligations with cash on hand and proceeds from additional borrowings.

(in millions)	Maturity Date	Interest Rate		September 30, 2021
Unsecured Debt
Duke Energy (Parent)(a)	October 2021	5.125	%	500
Duke Energy Florida(b)	November 2021	0.372	%	200
Duke Energy Progress(b)	February 2022	0.305	%	700
Duke Energy (Parent)	March 2022	3.227	%	300
Duke Energy (Parent)(b)	March 2022	0.764	%	300
Progress Energy	April 2022	3.150	%	450
Duke Energy (Parent)	August 2022	3.050	%	500
Duke Energy (Parent)	August 2022	2.400	%	500
First Mortgage Bonds
Duke Energy Indiana	January 2022	8.850	%	53
Duke Energy Carolinas	May 2022	3.350	%	350
Duke Energy Progress	May 2022	2.800	%	500
Other(c)				520
Current maturities of long-term debt				$	4,873

(a)Junior unsecured notes due January 2073 were redeemed on October 7, 2021.

(b)Debt has a floating interest rate.

(c)Includes finance lease obligations, amortizing debt, tax-exempt bonds with mandatory put options and small bullet maturities.

62

FINANCIAL STATEMENTS DEBT AND CREDIT FACILITIES

AVAILABLE CREDIT FACILITIES

Master Credit Facility

In March 2021, Duke Energy amended its existing $8 billion Master Credit Facility to extend the termination date to March 2026. The Duke Energy Registrants, excluding Progress Energy, have borrowing capacity under the Master Credit Facility up to a specified sublimit for each borrower. Duke Energy has the unilateral ability at any time to increase or decrease the borrowing sublimits of each borrower, subject to a maximum sublimit for each borrower. The amount available under the Master Credit Facility has been reduced to backstop issuances of commercial paper, certain letters of credit and variable-rate demand tax-exempt bonds that may be put to the Duke Energy Registrants at the option of the holder.

The table below includes the current borrowing sublimits and available capacity under these credit facilities.

	September 30, 2021
			Duke		Duke		Duke		Duke		Duke		Duke
	Duke		Energy		Energy		Energy		Energy		Energy		Energy
(in millions)	Energy		(Parent)		Carolinas		Progress		Florida		Ohio		Indiana		Piedmont
Facility size(a)	$	8,000	$	2,650	$	1,275	$	1,150	$	850	$	775	$	600	$	700
Reduction to backstop issuances
Commercial paper(b)	(1,611)		389		(375)		(253)		(527)		(419)		(150)		(276)
Outstanding letters of credit	(31)		(25)		(4)		(2)		—		—		—		—
Tax-exempt bonds	(81)		—		—		—		—		—		(81)		—
Available capacity under the Master Credit Facility	$	6,277	$	3,014	$	896	$	895	$	323	$	356	$	369	$	424

(a)Represents the sublimit of each borrower.

(b)Duke Energy issued $625 million of commercial paper and loaned the proceeds through the money pool to Duke Energy Carolinas, Duke Energy Progress, Duke Energy Ohio and Duke Energy Indiana. The balances are classified as Long-Term Debt Payable to Affiliated Companies on the Condensed Consolidated Balance Sheets.

Other Credit Facilities

	September 30, 2021
(in millions)	Facility size		Amount drawn
Duke Energy (Parent) Three-Year Revolving Credit Facility(a)	$	1,000	$	500

(a)During March 2021, Duke Energy extended the maturity date of the Three-Year Revolving Credit Facility from May 2022 to May 2024.

Duke Energy Ohio Term Loan Facility

In October 2021, Duke Energy Ohio entered into a two-year term loan facility with commitments totaling $100 million. Borrowings under the facility will be used to pay down short-term debt and for general corporate purposes. The term loan was fully drawn at the time of closing in October. The balance will be classified as Long-Term Debt on Duke Energy Ohio’s Condensed Consolidated Balance Sheets.

Duke Energy Kentucky Term Loan Facility

In October 2021, Duke Energy Kentucky entered into a two-year term loan facility with commitments totaling $50 million. Borrowings under the facility will be used to pay down short-term debt and for general corporate purposes. The term loan was fully drawn at the time of closing in October. The balance will be classified as Long-Term Debt on Duke Energy Ohio's Condensed Consolidated Balance Sheet.

Duke Energy Indiana Term Loan Facility

In October 2021, Duke Energy Indiana entered into a two-year term loan facility with commitments totaling $300 million. Borrowings under the facility will be used to pay down short-term debt and for general corporate purposes. The term loan was fully drawn at the time of closing in October. The balance will be classified as Long-Term Debt on Duke Energy Indiana’s Condensed Consolidated Balance Sheet.

6. GOODWILL

Duke Energy

The following table presents the goodwill by reportable segment included on Duke Energy's Condensed Consolidated Balance Sheets at September 30, 2021, and December 31, 2020.

	Electric Utilities		Gas Utilities		Commercial
(in millions)	and Infrastructure		and Infrastructure		Renewables		Total
Goodwill balance	$	17,379	$	1,924	$	122	$	19,425
Accumulated impairment charges	—		—		(122)		(122)
Goodwill, adjusted for accumulated impairment charges	$	17,379	$	1,924	$	—	$	19,303

63

FINANCIAL STATEMENTS GOODWILL

Duke Energy Ohio

Duke Energy Ohio's Goodwill balance of $920 million, allocated $596 million to Electric Utilities and Infrastructure and $324 million to Gas Utilities and Infrastructure, is presented net of accumulated impairment charges of $216 million on the Condensed Consolidated Balance Sheets at September 30, 2021, and December 31, 2020.

Progress Energy

Progress Energy's Goodwill is included in the Electric Utilities and Infrastructure segment and there are no accumulated impairment charges.

Piedmont

Piedmont's Goodwill is included in the Gas Utilities and Infrastructure segment and there are no accumulated impairment charges.

Impairment Testing

Duke Energy, Progress Energy, Duke Energy Ohio and Piedmont are required to perform an annual goodwill impairment test as of the same date each year and, accordingly, perform their annual impairment testing of goodwill as of August 31. Duke Energy, Progress Energy, Duke Energy Ohio and Piedmont update their test between annual tests if events or circumstances occur that would more likely than not reduce the fair value of a reporting unit below its carrying value. As the fair value for Duke Energy, Progress Energy, Duke Energy Ohio and Piedmont exceeded their respective carrying values at the date of the annual impairment analysis, no goodwill impairment charges were recorded in the third quarter of 2021.

7. RELATED PARTY TRANSACTIONS

The Subsidiary Registrants engage in related party transactions in accordance with applicable state and federal commission regulations. Refer to the Condensed Consolidated Balance Sheets of the Subsidiary Registrants for balances due to or due from related parties. Material amounts related to transactions with related parties included on the Condensed Consolidated Statements of Operations and Comprehensive Income are presented in the following table.

	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2021		2020		2021		2020
Duke Energy Carolinas
Corporate governance and shared service expenses(a)	$	207	$	198	$	653	$	528
Indemnification coverages(b)	6		5		18		15
Joint Dispatch Agreement (JDA) revenue(c)	6		6		32		16
JDA expense(c)	68		28		133		72
Intercompany natural gas purchases(d)	14		10		43		26
Progress Energy
Corporate governance and shared service expenses(a)	$	201	$	185	$	615	$	520
Indemnification coverages(b)	10		9		31		27
JDA revenue(c)	68		28		133		72
JDA expense(c)	6		6		32		16
Intercompany natural gas purchases(d)	19		18		56		56
Duke Energy Progress
Corporate governance and shared service expenses(a)	$	121	$	113	$	367	$	301
Indemnification coverages(b)	4		4		14		13
JDA revenue(c)	68		28		133		72
JDA expense(c)	6		6		32		16
Intercompany natural gas purchases(d)	19		18		56		56
Duke Energy Florida
Corporate governance and shared service expenses(a)	$	80	$	72	$	248	$	219
Indemnification coverages(b)	6		5		17		14
Duke Energy Ohio
Corporate governance and shared service expenses(a)	$	79	$	80	$	237	$	241
Indemnification coverages(b)	1		1		3		3
Duke Energy Indiana
Corporate governance and shared service expenses(a)	$	96	$	102	$	302	$	300
Indemnification coverages(b)	2		2		6		6
Piedmont
Corporate governance and shared service expenses(a)	$	32	$	31	$	101	$	102
Indemnification coverages(b)	1		1		3		2
Intercompany natural gas sales(d)	33		28		99		82
Natural gas storage and transportation costs(e)	6		6		17		17

64

FINANCIAL STATEMENTS RELATED PARTY TRANSACTIONS

(a)The Subsidiary Registrants are charged their proportionate share of corporate governance and other shared services costs, primarily related to human resources, employee benefits, information technology, legal and accounting fees, as well as other third-party costs. These amounts are primarily recorded in Operation, maintenance and other and Impairment of assets and other charges on the Condensed Consolidated Statements of Operations and Comprehensive Income.

(b)The Subsidiary Registrants incur expenses related to certain indemnification coverages through Bison, Duke Energy’s wholly owned captive insurance subsidiary. These expenses are recorded in Operation, maintenance and other on the Condensed Consolidated Statements of Operations and Comprehensive Income.

(c)Duke Energy Carolinas and Duke Energy Progress participate in a JDA, which allows the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power and expenses from the purchase of power pursuant to the JDA are recorded in Operating Revenues and Fuel used in electric generation and purchased power, respectively, on the Condensed Consolidated Statements of Operations and Comprehensive Income.

(d)Piedmont provides long-term natural gas delivery service to certain Duke Energy Carolinas and Duke Energy Progress natural gas-fired generation facilities. Piedmont records the sales in Operating revenues, and Duke Energy Carolinas and Duke Energy Progress record the related purchases as a component of Fuel used in electric generation and purchased power on their respective Condensed Consolidated Statements of Operations and Comprehensive Income.

(e)Piedmont has related party transactions as a customer of its equity method investments in Pine Needle LNG Company, LLC, Hardy Storage Company, LLC and Cardinal Pipeline Company, LLC natural gas storage and transportation facilities. These expenses are included in Cost of natural gas on Piedmont's Condensed Consolidated Statements of Operations and Comprehensive Income.

In addition to the amounts presented above, the Subsidiary Registrants have other affiliate transactions, including rental of office space, participation in a money pool arrangement, other operational transactions, such as pipeline lease arrangements, and their proportionate share of certain charged expenses. These transactions of the Subsidiary Registrants are incurred in the ordinary course of business and are eliminated in consolidation.

As discussed in Note 11, certain trade receivables have been sold by Duke Energy Ohio and Duke Energy Indiana to CRC, an affiliate formed by a subsidiary of Duke Energy. The proceeds obtained from the sales of receivables are largely cash but do include a subordinated note from CRC for a portion of the purchase price.

Intercompany Income Taxes

Duke Energy and the Subsidiary Registrants file a consolidated federal income tax return and other state and jurisdictional returns. The Subsidiary Registrants have a tax sharing agreement with Duke Energy for the allocation of consolidated tax liabilities and benefits. Income taxes recorded represent amounts the Subsidiary Registrants would incur as separate C-Corporations. The following table includes the balance of intercompany income tax receivables and payables for the Subsidiary Registrants.

	Duke				Duke		Duke		Duke		Duke
	Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
September 30, 2021
Intercompany income tax receivable	$	—	$	36	$	—	$	8	$	1	$	—	$	14
Intercompany income tax payable	133		—		51		—		—		17		—
December 31, 2020
Intercompany income tax receivable	$	—	$	—	$	—	$	—	$	—	$	9	$	10
Intercompany income tax payable	31		33		46		35		2		—		—

8. DERIVATIVES AND HEDGING

The Duke Energy Registrants use commodity and interest rate contracts to manage commodity price risk and interest rate risk. The primary use of commodity derivatives is to hedge the generation portfolio against changes in the prices of electricity and natural gas. Piedmont enters into natural gas supply contracts to provide diversification, reliability and natural gas cost benefits to its customers. Interest rate derivatives are used to manage interest rate risk associated with borrowings.

All derivative instruments not identified as NPNS are recorded at fair value as assets or liabilities on the Condensed Consolidated Balance Sheets. Cash collateral related to derivative instruments executed under master netting arrangements is offset against the collateralized derivatives on the Condensed Consolidated Balance Sheets. The cash impacts of settled derivatives are recorded as operating activities on the Condensed Consolidated Statements of Cash Flows.

INTEREST RATE RISK

The Duke Energy Registrants are exposed to changes in interest rates as a result of their issuance or anticipated issuance of variable-rate and fixed-rate debt and commercial paper. Interest rate risk is managed by limiting variable-rate exposures to a percentage of total debt and by monitoring changes in interest rates. To manage risk associated with changes in interest rates, the Duke Energy Registrants may enter into interest rate swaps, U.S. Treasury lock agreements and other financial contracts. In anticipation of certain fixed-rate debt issuances, a series of forward-starting interest rate swaps or Treasury locks may be executed to lock in components of current market interest rates. These instruments are later terminated prior to or upon the issuance of the corresponding debt.

65

FINANCIAL STATEMENTS DERIVATIVES AND HEDGING

Cash Flow Hedges

For a derivative designated as hedging the exposure to variable cash flows of a future transaction, referred to as a cash flow hedge, the effective portion of the derivative's gain or loss is initially reported as a component of other comprehensive income and subsequently reclassified into earnings once the future transaction impacts earnings. Amounts for interest rate contracts are reclassified to earnings as interest expense over the term of the related debt. Gains and losses reclassified out of accumulated other comprehensive loss for the three and nine months ended September 30, 2021, and 2020, were not material. Duke Energy's interest rate derivatives designated as hedges include interest rate swaps used to hedge existing debt within the Commercial Renewables segment and forward-starting interest rate swaps not accounted for under regulatory accounting.

Undesignated Contracts

Undesignated contracts primarily include contracts not designated as a hedge because they are accounted for under regulatory accounting or contracts that do not qualify for hedge accounting.

Duke Energy’s interest rate swaps for its regulated operations employ regulatory accounting. With regulatory accounting, the mark-to-market gains or losses on the swaps are deferred as regulatory liabilities or regulatory assets, respectively. Regulatory assets and liabilities are amortized consistent with the treatment of the related costs in the ratemaking process. The accrual of interest on the swaps is recorded as Interest Expense on the Duke Energy Registrant's Condensed Consolidated Statements of Operations and Comprehensive Income.

The following table shows notional amounts of outstanding derivatives related to interest rate risk.

	September 30, 2021
			Duke				Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio
Cash flow hedges	$	2,094	$	—	$	—	$	—	$	—	$	—
Undesignated contracts	1,371		350		900		400		500		27
Total notional amount(a)	$	3,465	$	350	$	900	$	400	$	500	$	27

	December 31, 2020
			Duke				Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio
Cash flow hedges	$	632	$	—	$	—	$	—	$	—	$	—
Undesignated contracts	1,177		400		750		750		—		27
Total notional amount(a)	$	1,809	$	400	$	750	$	750	$	—	$	27

(a)Duke Energy includes amounts related to consolidated VIEs of $594 million in cash flow hedges and $94 million in undesignated contracts as of September 30, 2021, and $632 million in cash flow hedges as of December 31, 2020.

COMMODITY PRICE RISK

The Duke Energy Registrants are exposed to the impact of changes in the prices of electricity purchased and sold in bulk power markets and natural gas purchases, including Piedmont's natural gas supply contracts. Exposure to commodity price risk is influenced by a number of factors including the term of contracts, the liquidity of markets and delivery locations. To manage risk associated with commodity prices, the Duke Energy Registrants may enter into long-term power purchase or sales contracts and long-term natural gas supply agreements.

Cash Flow Hedges

For derivatives designated as hedging the exposure to variable cash flows of a future transaction, referred to as a cash flow hedge, the derivative's gain or loss is initially reported as a component of other comprehensive income and subsequently reclassified into earnings once the future transaction impacts earnings. Gains and losses reclassified out of accumulated other comprehensive loss for the three and nine months ended September 30, 2021, and 2020, were not material. Duke Energy’s commodity derivatives designated as hedges include long-term electricity sales in the Commercial Renewables segment.

Undesignated Contracts

For the Subsidiary Registrants, bulk power electricity and natural gas purchases flow through fuel adjustment clauses, formula-based contracts or other cost-sharing mechanisms. Differences between the costs included in rates and the incurred costs, including undesignated derivative contracts, are largely deferred as regulatory assets or regulatory liabilities. Piedmont policies allow for the use of financial instruments to hedge commodity price risks. The strategy and objective of these hedging programs are to use the financial instruments to reduce natural gas costs volatility for customers.

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FINANCIAL STATEMENTS DERIVATIVES AND HEDGING

Volumes

The tables below include volumes of outstanding commodity derivatives. Amounts disclosed represent the absolute value of notional volumes of commodity contracts excluding NPNS. The Duke Energy Registrants have netted contractual amounts where offsetting purchase and sale contracts exist with identical delivery locations and times of delivery. Where all commodity positions are perfectly offset, no quantities are shown.

	September 30, 2021
		Duke		Duke	Duke	Duke
	Duke	Energy	Progress	Energy	Energy	Energy
	Energy	Carolinas	Energy	Progress	Ohio	Indiana	Piedmont
Electricity (GWh)(a)	29,044	—	—	—	3,004	15,881	—
Natural gas (millions of dekatherms)	772	230	190	190	—	7	345

	December 31, 2020
		Duke		Duke	Duke	Duke
	Duke	Energy	Progress	Energy	Energy	Energy
	Energy	Carolinas	Energy	Progress	Ohio	Indiana	Piedmont
Electricity (GWh)(a)	35,409	—	—	—	2,559	10,802	—
Natural gas (millions of dekatherms)	678	145	158	158	—	2	373

(a)Duke Energy includes 10,159 GWh and 22,048 GWh related to cash flow hedges as of September 30, 2021, and December 31, 2020, respectively.

LOCATION AND FAIR VALUE OF DERIVATIVE ASSETS AND LIABILITIES RECOGNIZED ON THE CONDENSED CONSOLIDATED BALANCE SHEETS

The following tables show the fair value and balance sheet location of derivative instruments. Although derivatives subject to master netting arrangements are netted on the Condensed Consolidated Balance Sheets, the fair values presented below are shown gross and cash collateral on the derivatives has not been netted against the fair values shown.

Derivative Assets	September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Commodity Contracts
Not Designated as Hedging Instruments
Current	$	359	$	171	$	135	$	135	$	—	$	4	$	36	$	12
Noncurrent	177		100		78		78		—		—		—		—
Total Derivative Assets – Commodity Contracts	$	536	$	271	$	213	$	213	$	—	$	4	$	36	$	12
Interest Rate Contracts
Designated as Hedging Instruments
Current	$	2	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Noncurrent	3		—		—		—		—		—		—		—
Not Designated as Hedging Instruments
Current	$	2	$	—	$	2	$	2	$	—	$	—	$	—	$	—
Total Derivative Assets – Interest Rate Contracts	$	7	$	—	$	2	$	2	$	—	$	—	$	—	$	—
Total Derivative Assets	$	543	$	271	$	215	$	215	$	—	$	4	$	36	$	12

67

FINANCIAL STATEMENTS DERIVATIVES AND HEDGING

Derivative Liabilities	September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Commodity Contracts
Designated as Hedging Instruments
Current	$	37	$	—	$	—	$	—	$	—	$	—	$	—	—
Noncurrent	120		—		—		—		—		—		—		—
Not Designated as Hedging Instruments
Current	$	33	$	12	$	—	$	—	$	—	$	—	$	2	$	20
Noncurrent	128		—		—		—		—		—		—		128
Total Derivative Liabilities – Commodity Contracts	$	318	$	12	$	—	$	—	$	—	$	—	$	2	$	148
Interest Rate Contracts
Designated as Hedging Instruments
Current	$	45	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Noncurrent	29		—		—		—		—		—		—		—
Not Designated as Hedging Instruments
Current	19		6		12		—		12		1		—		—
Noncurrent	4		—		—		—		—		4		—		—
Total Derivative Liabilities – Interest Rate Contracts	$	97	$	6	$	12	$	—	$	12	$	5	$	—	$	—
Total Derivative Liabilities	$	415	$	18	$	12	$	—	$	12	$	5	$	2	$	148

Derivative Assets	December 31, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Commodity Contracts
Not Designated as Hedging Instruments
Current	$	30	$	14	$	9	$	9	$	—	$	1	$	6	$	1
Noncurrent	13		6		6		6		—		—		—		—
Total Derivative Assets – Commodity Contracts	$	43	$	20	$	15	$	15	$	—	$	1	$	6	$	1
Interest Rate Contracts
Not Designated as Hedging Instruments
Current	$	18	$	—	$	18	$	18	$	—	$	—	$	—	$	—
Total Derivative Assets – Interest Rate Contracts	$	18	$	—	$	18	$	18	$	—	$	—	$	—	$	—
Total Derivative Assets	$	61	$	20	$	33	$	33	$	—	$	1	$	6	$	1

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FINANCIAL STATEMENTS DERIVATIVES AND HEDGING

Derivative Liabilities	December 31, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Commodity Contracts
Designated as Hedging Instruments
Current	$	14	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Noncurrent	70		—		—		—		—		—		—		—
Not Designated as Hedging Instruments
Current	$	30	$	13	$	2	$	2	$	—	$	—	$	1	$	15
Noncurrent	137		3		27		12		—		—		—		107
Total Derivative Liabilities – Commodity Contracts	$	251	$	16	$	29	$	14	$	—	$	—	$	1	$	122
Interest Rate Contracts
Designated as Hedging Instruments
Current	$	15	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Noncurrent	48		—		—		—		—		—		—		—
Not Designated as Hedging Instruments
Current	5		4		—		—		—		1		—		—
Noncurrent	5		—		—		—		—		5		—		—
Total Derivative Liabilities – Interest Rate Contracts	$	73	$	4	$	—	$	—	$	—	$	6	$	—	$	—
Total Derivative Liabilities	$	324	$	20	$	29	$	14	$	—	$	6	$	1	$	122

OFFSETTING ASSETS AND LIABILITIES

The following tables present the line items on the Condensed Consolidated Balance Sheets where derivatives are reported. Substantially all of Duke Energy's outstanding derivative contracts are subject to enforceable master netting arrangements. The gross amounts offset in the tables below show the effect of these netting arrangements on financial position, and include collateral posted to offset the net position. The amounts shown are calculated by counterparty. Accounts receivable or accounts payable may also be available to offset exposures in the event of bankruptcy. These amounts are not included in the tables below.

Derivative Assets	September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Current
Gross amounts recognized	$	363	$	171	$	137	$	137	$	—	$	4	$	36	$	12
Gross amounts offset	(143)		(87)		(56)		(56)		—		—		—		—
Net amounts presented in Current Assets: Other	$	220	$	84	$	81	$	81	$	—	$	4	$	36	$	12
Noncurrent
Gross amounts recognized	$	180	$	100	$	78	$	78	$	—	$	—	$	—	$	—
Gross amounts offset	(71)		(45)		(26)		(26)		—		—		—		—
Net amounts presented in Other Noncurrent Assets: Other	$	109	$	55	$	52	$	52	$	—	$	—	$	—	$	—

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FINANCIAL STATEMENTS DERIVATIVES AND HEDGING

Derivative Liabilities	September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Current
Gross amounts recognized	$	134	$	18	$	12	$	—	$	12	$	1	$	2	$	20
Gross amounts offset	—		—		—		—		—		—		—		—
Net amounts presented in Current Liabilities: Other	$	134	$	18	$	12	$	—	$	12	$	1	$	2	$	20
Noncurrent
Gross amounts recognized	$	281	$	—	$	—	$	—	$	—	$	4	$	—	$	128
Gross amounts offset	—		—		—		—		—		—		—		—
Net amounts presented in Other Noncurrent Liabilities: Other	$	281	$	—	$	—	$	—	$	—	$	4	$	—	$	128

Derivative Assets	December 31, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Current
Gross amounts recognized	$	48	$	14	$	27	$	27	$	—	$	1	$	6	$	1
Gross amounts offset	(3)		(2)		(2)		(2)		—		—		—		—
Net amounts presented in Current Assets: Other	$	45	$	12	$	25	$	25	$	—	$	1	$	6	$	1
Noncurrent
Gross amounts recognized	$	13	$	6	$	6	$	6	$	—	$	—	$	—	$	—
Gross amounts offset	(5)		(1)		(4)		(4)		—		—		—		—
Net amounts presented in Other Noncurrent Assets: Other	$	8	$	5	$	2	$	2	$	—	$	—	$	—	$	—

Derivative Liabilities	December 31, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Current
Gross amounts recognized	$	64	$	17	$	2	$	2	$	—	$	1	$	1	$	15
Gross amounts offset	(3)		(2)		(2)		(2)		—		—		—		—
Net amounts presented in Current Liabilities: Other	$	61	$	15	$	—	$	—	$	—	$	1	$	1	$	15
Noncurrent
Gross amounts recognized	$	260	$	3	$	27	$	12	$	—	$	5	$	—	$	107
Gross amounts offset	(5)		(1)		(4)		(4)		—		—		—		—
Net amounts presented in Other Noncurrent Liabilities: Other	$	255	$	2	$	23	$	8	$	—	$	5	$	—	$	107

9. INVESTMENTS IN DEBT AND EQUITY SECURITIES

Duke Energy’s investments in debt and equity securities are primarily comprised of investments held in (i) the NDTF at Duke Energy Carolinas, Duke Energy Progress and Duke Energy Florida, (ii) the grantor trusts at Duke Energy Progress, Duke Energy Florida and Duke Energy Indiana related to OPEB plans and (iii) Bison. The Duke Energy Registrants classify investments in debt securities as AFS and investments in equity securities as fair value through net income (FV-NI).

For investments in debt securities classified as AFS, the unrealized gains and losses are included in other comprehensive income until realized, at which time they are reported through net income. For investments in equity securities classified as FV-NI, both realized and unrealized gains and losses are reported through net income. Substantially all of Duke Energy’s investments in debt and equity securities qualify for regulatory accounting, and accordingly, all associated realized and unrealized gains and losses on these investments are deferred as a regulatory asset or liability.

Duke Energy classifies the majority of investments in debt and equity securities as long term, unless otherwise noted.

70

FINANCIAL STATEMENTS INVESTMENTS IN DEBT AND EQUITY SECURITIES

Investment Trusts

The investments within the Investment Trusts are managed by independent investment managers with discretion to buy, sell and invest pursuant to the objectives set forth by the investment manager agreements and trust agreements. The Duke Energy Registrants have limited oversight of the day-to-day management of these investments. As a result, the ability to hold investments in unrealized loss positions is outside the control of the Duke Energy Registrants. Accordingly, all unrealized losses associated with debt securities within the Investment Trusts are recognized immediately and deferred to regulatory accounts where appropriate.

Other AFS Securities

Unrealized gains and losses on all other AFS securities are included in other comprehensive income until realized, unless it is determined the carrying value of an investment has a credit loss. The Duke Energy Registrants analyze all investment holdings each reporting period to determine whether a decline in fair value is related to a credit loss. If a credit loss exists, the unrealized credit loss is included in earnings. There were no material credit losses as of September 30, 2021, and December 31, 2020.

Other Investments amounts are recorded in Other within Other Noncurrent Assets on the Condensed Consolidated Balance Sheets.

DUKE ENERGY

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	164	$	—	$	—	$	177
Equity securities	4,700		35		6,754		4,138		54		6,235
Corporate debt securities	44		5		847		76		1		806
Municipal bonds	13		1		296		22		—		370
U.S. government bonds	34		8		1,605		51		—		1,361
Other debt securities	4		1		195		8		—		180
Total NDTF Investments	$	4,795	$	50	$	9,861	$	4,295	$	55	$	9,129
Other Investments
Cash and cash equivalents	$	—	$	—	$	87	$	—	$	—	$	127
Equity securities	83		—		145		79		—		146
Corporate debt securities	4		1		130		8		—		110
Municipal bonds	3		1		69		5		—		86
U.S. government bonds	—		—		50		—		—		42
Other debt securities	—		—		34		—		—		47
Total Other Investments	$	90	$	2	$	515	$	92	$	—	$	558
Total Investments	$	4,885	$	52	$	10,376	$	4,387	$	55	$	9,687

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2021, and 2020, were as follows.

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
FV-NI:
Realized gains	$	34	$	13	$	320	$	338
Realized losses	40		16		100		148
AFS:
Realized gains	17		26		51		73
Realized losses	15		19		46		38

71

FINANCIAL STATEMENTS INVESTMENTS IN DEBT AND EQUITY SECURITIES

DUKE ENERGY CAROLINAS

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	60	$	—	$	—	$	30
Equity securities	2,725		14		3,912		2,442		23		3,685
Corporate debt securities	27		3		495		49		1		510
Municipal bonds	1		—		24		6		—		91
U.S. government bonds	18		2		752		25		—		475
Other debt securities	4		1		190		7		—		174
Total NDTF Investments	$	2,775	$	20	$	5,433	$	2,529	$	24	$	4,965

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2021, and 2020, were as follows.

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
FV-NI:
Realized gains	$	25	$	10	$	243	$	46
Realized losses	29		12		68		82
AFS:
Realized gains	10		20		35		50
Realized losses	10		17		32		30

PROGRESS ENERGY

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	104	$	—	$	—	$	147
Equity securities	1,975		21		2,842		1,696		31		2,550
Corporate debt securities	17		2		352		27		—		296
Municipal bonds	12		1		272		16		—		279
U.S. government bonds	16		6		853		26		—		886
Other debt securities	—		—		5		1		—		6
Total NDTF Investments	$	2,020	$	30	$	4,428	$	1,766	$	31	$	4,164
Other Investments
Cash and cash equivalents	$	—	$	—	$	18	$	—	$	—	$	106
Municipal bonds	2		—		26		3		—		26
Total Other Investments	$	2	$	—	$	44	$	3	$	—	$	132
Total Investments	$	2,022	$	30	$	4,472	$	1,769	$	31	$	4,296

72

FINANCIAL STATEMENTS INVESTMENTS IN DEBT AND EQUITY SECURITIES

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2021, and 2020, were as follows.

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
FV-NI:
Realized gains	$	9	$	3	$	77	$	292
Realized losses	11		4		32		66
AFS:
Realized gains	7		6		14		17
Realized losses	6		2		12		7

DUKE ENERGY PROGRESS

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	92	$	—	$	—	$	76
Equity securities	1,882		21		2,736		1,617		31		2,459
Corporate debt securities	17		2		287		27		—		296
Municipal bonds	12		1		272		16		—		279
U.S. government bonds	16		2		466		26		—		412
Other debt securities	—		—		5		1		—		6
Total NDTF Investments	$	1,927	$	26	$	3,858	$	1,687	$	31	$	3,528
Other Investments
Cash and cash equivalents	$	—	$	—	$	16	$	—	$	—	$	1
Total Other Investments	$	—	$	—	$	16	$	—	$	—	$	1
Total Investments	$	1,927	$	26	$	3,874	$	1,687	$	31	$	3,529

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2021, and 2020, were as follows.

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
FV-NI:
Realized gains	$	9	$	3	$	76	$	43
Realized losses	11		4		31		51
AFS:
Realized gains	6		6		13		17
Realized losses	5		2		11		7

73

FINANCIAL STATEMENTS INVESTMENTS IN DEBT AND EQUITY SECURITIES

DUKE ENERGY FLORIDA

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	12	$	—	$	—	$	71
Equity securities	93		—		106		79		—		91
Corporate debt securities	—		—		65		—		—		—
U.S. government bonds	—		4		387		—		—		474
Total NDTF Investments(a)	$	93	$	4	$	570	$	79	$	—	$	636
Other Investments
Cash and cash equivalents	$	—	$	—	$	1	$	—	$	—	$	1
Municipal bonds	2		—		26		3		—		26
Total Other Investments	$	2	$	—	$	27	$	3	$	—	$	27
Total Investments	$	95	$	4	$	597	$	82	$	—	$	663

(a)During the nine months ended September 30, 2021, and the year ended December 31, 2020, Duke Energy Florida received reimbursements from the NDTF for costs related to ongoing decommissioning activity of Crystal River Unit 3.

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2021, and 2020, were as follows:

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
FV-NI:
Realized gains	$	—	$	—	$	1	$	249
Realized losses	—		—		1		15
AFS:
Realized gains	1		—		1		—
Realized losses	1		—		1		—

DUKE ENERGY INDIANA

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are measured at FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
Investments
Cash and cash equivalents	$	—	$	—	$	19	$	—	$	—	$	1
Equity securities	56		—		90		58		—		97
Corporate debt securities	—		—		5		—		—		3
Municipal bonds	1		1		36		1		—		38
U.S. government bonds	—		—		5		—		—		4
Total Investments	$	57	$	1	$	155	$	59	$	—	$	143

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2021, and 2020, were immaterial.

74

FINANCIAL STATEMENTS INVESTMENTS IN DEBT AND EQUITY SECURITIES

DEBT SECURITY MATURITIES

The table below summarizes the maturity date for debt securities.

	September 30, 2021
			Duke				Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Indiana
Due in one year or less	$	151	$	3	$	121	$	22	$	99	$	5
Due after one through five years	954		343		548		244		304		18
Due after five through 10 years	639		268		286		247		39		8
Due after 10 years	1,482		847		553		517		36		15
Total	$	3,226	$	1,461	$	1,508	$	1,030	$	478	$	46

10. FAIR VALUE MEASUREMENTS

Fair value is the exchange price to sell an asset or transfer a liability in an orderly transaction between market participants at the measurement date. The fair value definition focuses on an exit price versus the acquisition cost. Fair value measurements use market data or assumptions market participants would use in pricing the asset or liability, including assumptions about risk and the risks inherent in the inputs to the valuation technique. These inputs may be readily observable, corroborated by market data or generally unobservable. Valuation techniques maximize the use of observable inputs and minimize use of unobservable inputs. A midmarket pricing convention (the midpoint price between bid and ask prices) is permitted for use as a practical expedient.

Fair value measurements are classified in three levels based on the fair value hierarchy as defined by GAAP. Certain investments are not categorized within the fair value hierarchy. These investments are measured at fair value using the net asset value (NAV) per share practical expedient. The NAV is derived based on the investment cost, less any impairment, plus or minus changes resulting from observable price changes for an identical or similar investment of the same issuer.

Fair value accounting guidance permits entities to elect to measure certain financial instruments that are not required to be accounted for at fair value, such as equity method investments or the company’s own debt, at fair value. The Duke Energy Registrants have not elected to record any of these items at fair value.

Valuation methods of the primary fair value measurements disclosed below are as follows.

Investments in equity securities

The majority of investments in equity securities are valued using Level 1 measurements. Investments in equity securities are typically valued at the closing price in the principal active market as of the last business day of the quarter. Principal active markets for equity prices include published exchanges such as the New York Stock Exchange and Nasdaq Stock Market. Foreign equity prices are translated from their trading currency using the currency exchange rate in effect at the close of the principal active market. There was no after-hours market activity that was required to be reflected in the reported fair value measurements.

Investments in debt securities

Most investments in debt securities are valued using Level 2 measurements because the valuations use interest rate curves and credit spreads applied to the terms of the debt instrument (maturity and coupon interest rate) and consider the counterparty credit rating. If the market for a particular fixed-income security is relatively inactive or illiquid, the measurement is Level 3.

Commodity derivatives

Commodity derivatives with clearinghouses are classified as Level 1. Commodity derivatives with observable forward curves are classified as Level 2. If forward price curves are not observable for the full term of the contract and the unobservable period had more than an insignificant impact on the valuation, the commodity derivative is classified as Level 3. In isolation, increases (decreases) in natural gas forward prices result in favorable (unfavorable) fair value adjustments for natural gas purchase contracts; and increases (decreases) in electricity forward prices result in unfavorable (favorable) fair value adjustments for electricity sales contracts. Duke Energy regularly evaluates and validates pricing inputs used to estimate the fair value of natural gas commodity contracts by a market participant price verification procedure. This procedure provides a comparison of internal forward commodity curves to market participant generated curves.

Interest rate derivatives

Most over-the-counter interest rate contract derivatives are valued using financial models that utilize observable inputs for similar instruments and are classified as Level 2. Inputs include forward interest rate curves, notional amounts, interest rates and credit quality of the counterparties.

Other fair value considerations

See Note 11 in Duke Energy's Annual Report on Form 10-K for the year ended December 31, 2020, for a discussion of the valuation of goodwill and intangible assets.

75

FINANCIAL STATEMENTS FAIR VALUE MEASUREMENTS

DUKE ENERGY

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. Derivative amounts in the tables below for all Duke Energy Registrants exclude cash collateral, which is disclosed in Note 8. See Note 9 for additional information related to investments by major security type for the Duke Energy Registrants.

	September 30, 2021
(in millions)	Total Fair Value		Level 1		Level 2		Level 3		Not Categorized
NDTF cash and cash equivalents	$	164	$	164	$	—	$	—	$	—
NDTF equity securities	6,754		6,705		—		—		49
NDTF debt securities	2,943		998		1,945		—		—
Other equity securities	145		145		—		—		—
Other debt securities	283		45		238		—		—
Other cash and cash equivalents	87		87		—		—		—
Derivative assets	543		27		490		26		—
Total assets	10,919		8,171		2,673		26		49
Derivative liabilities	(415)		(2)		(256)		(157)		—
Net assets (liabilities)	$	10,504	$	8,169	$	2,417	$	(131)	$	49

	December 31, 2020
(in millions)	Total Fair Value		Level 1		Level 2		Level 3		Not Categorized
NDTF cash and cash equivalents	$	177	$	177	$	—	$	—	$	—
NDTF equity securities	6,235		6,189		—		—		46
NDTF debt securities	2,717		874		1,843		—		—
Other equity securities	146		146		—		—		—
Other debt securities	285		37		248		—		—
Other cash and cash equivalents	127		127		—		—		—
Derivative assets	61		1		53		7		—
Total assets	9,748		7,551		2,144		7		46
Derivative liabilities	(324)		—		(240)		(84)		—
Net assets (liabilities)	$	9,424	$	7,551	$	1,904	$	(77)	$	46

The following tables provide reconciliations of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements.

	Derivatives (net)
	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2021		2020		2021		2020
Balance at beginning of period	$	(131)	$	(92)	$	(77)	$	(102)
Total pretax realized or unrealized losses included in comprehensive income	(11)		(102)		(86)		(102)
Purchases, sales, issuances and settlements:
Purchases	—		—		21		14
Settlements	4		(3)		(4)		(18)
Total gains (losses) included on the Condensed Consolidated Balance Sheet	7		(6)		15		5
Balance at end of period	$	(131)	$	(203)	$	(131)	$	(203)

76

FINANCIAL STATEMENTS FAIR VALUE MEASUREMENTS

DUKE ENERGY CAROLINAS

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.

	September 30, 2021
(in millions)	Total Fair Value		Level 1		Level 2		Not Categorized
NDTF cash and cash equivalents	$	60	$	60	$	—	$	—
NDTF equity securities	3,912		3,863		—		49
NDTF debt securities	1,461		359		1,102		—
Derivative assets	271		—		271		—
Total assets	5,704		4,282		1,373		49
Derivative liabilities	(18)		—		(18)		—
Net assets	$	5,686	$	4,282	$	1,355	$	49

	December 31, 2020
(in millions)	Total Fair Value		Level 1		Level 2		Not Categorized
NDTF cash and cash equivalents	$	30	$	30	$	—	$	—
NDTF equity securities	3,685		3,639		—		46
NDTF debt securities	1,250		192		1,058		—
Derivative assets	20		—		20		—
Total assets	4,985		3,861		1,078		46
Derivative liabilities	(20)		—		(20)		—
Net assets	$	4,965	$	3,861	$	1,058	$	46

PROGRESS ENERGY

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.

	September 30, 2021						December 31, 2020
(in millions)	Total Fair Value		Level 1		Level 2		Total Fair Value		Level 1		Level 2
NDTF cash and cash equivalents	$	104	$	104	$	—	$	147	$	147	$	—
NDTF equity securities	2,842		2,842		—		2,550		2,550		—
NDTF debt securities	1,482		639		843		1,467		682		785
Other debt securities	26		—		26		26		—		26
Other cash and cash equivalents	18		18		—		106		106		—
Derivative assets	215		—		215		33		—		33
Total assets	4,687		3,603		1,084		4,329		3,485		844
Derivative liabilities	(12)		—		(12)		(29)		—		(29)
Net assets	$	4,675	$	3,603	$	1,072	$	4,300	$	3,485	$	815

DUKE ENERGY PROGRESS

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.

	September 30, 2021						December 31, 2020
(in millions)	Total Fair Value		Level 1		Level 2		Total Fair Value		Level 1		Level 2
NDTF cash and cash equivalents	$	92	$	92	$	—	$	76	$	76	$	—
NDTF equity securities	2,736		2,736		—		2,459		2,459		—
NDTF debt securities	1,030		278		752		993		237		756
Other cash and cash equivalents	16		16		—		1		1		—
Derivative assets	215		—		215		33		—		33
Total assets	4,089		3,122		967		3,562		2,773		789
Derivative liabilities	—		—		—		(14)		—		(14)
Net assets	$	4,089	$	3,122	$	967	$	3,548	$	2,773	$	775

77

FINANCIAL STATEMENTS FAIR VALUE MEASUREMENTS

DUKE ENERGY FLORIDA

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.

	September 30, 2021						December 31, 2020
(in millions)	Total Fair Value		Level 1		Level 2		Total Fair Value		Level 1		Level 2
NDTF cash and cash equivalents	$	12	$	12	$	—	$	71	$	71	$	—
NDTF equity securities	106		106		—		91		91		—
NDTF debt securities	452		361		91		474		445		29
Other debt securities	26		—		26		26		—		26
Other cash and cash equivalents	1		1		—		1		1		—
Total assets	597		480		117		663		608		55
Derivative liabilities	(12)		—		(12)		—		—		—
Net assets	$	585	$	480	$	105	$	663	$	608	$	55

DUKE ENERGY OHIO

The recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets were not material at September 30, 2021, and December 31, 2020.

DUKE ENERGY INDIANA

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.

	September 30, 2021								December 31, 2020
(in millions)	Total Fair Value		Level 1		Level 2		Level 3		Total Fair Value		Level 1		Level 2		Level 3
Other equity securities	$	90	$	90	$	—	$	—	$	97	$	97	$	—	$	—
Other debt securities	46		—		46		—		45		—		45		—
Other cash and cash equivalents	19		19		—		—		1		1		—		—
Derivative assets	36		12		—		24		6		—		—		6
Total assets	191		121		46		24		149		98		45		6
Derivative liabilities	(2)		(2)		—		—		(1)		(1)		—		—
Net assets	$	189	$	119	$	46	$	24	$	148	$	97	$	45	$	6

The following table provides a reconciliation of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements.

	Derivatives (net)
	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2021		2020		2021		2020
Balance at beginning of period	$	22	$	10	$	6	$	11
Purchases, sales, issuances and settlements:
Purchases	—		—		18		10
Settlements	(3)		(3)		(12)		(13)
Total gains included on the Condensed Consolidated Balance Sheet	5		1		12		—
Balance at end of period	$	24	$	8	$	24	$	8

PIEDMONT

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.

	September 30, 2021						December 31, 2020
(in millions)	Total Fair Value		Level 1		Level 2		Total Fair Value		Level 1		Level 2
Derivative assets	$	12	$	12	$	—	$	1	$	1	$	—
Derivative liabilities	(148)		—		(148)		(122)		—		(122)
Net (liabilities) assets	$	(136)	$	12	$	(148)	$	(121)	$	1	$	(122)

78

FINANCIAL STATEMENTS FAIR VALUE MEASUREMENTS

The following table provides a reconciliation of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements.

	Derivatives (net)
	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2021		2020		2021		2020
Balance at beginning of period	$	—	$	(105)	$	—	$	(117)
Total (losses) gains and settlements	—		(6)		—		6
Balance at end of period	$	—	$	(111)	$	—	$	(111)

QUANTITATIVE INFORMATION ABOUT UNOBSERVABLE INPUTS

The following tables include quantitative information about the Duke Energy Registrants' derivatives classified as Level 3.

	September 30, 2021
										Weighted
	Fair Value									Average
Investment Type	(in millions)		Valuation Technique	Unobservable Input	Range					Range
Duke Energy
Electricity contracts	$	(157)	RTO forward pricing	Forward electricity curves – price per MWh	$	18.02	-	$	143.85	$	38.43
Duke Energy Ohio
FTRs	2		RTO auction pricing	FTR price – per MWh	0.06		-	1.27		0.71
Duke Energy Indiana
FTRs	24		RTO auction pricing	FTR price – per MWh	(1.11)		-	8.55		1.61
Duke Energy
Total Level 3 derivatives	$	(131)

	December 31, 2020
									Weighted
	Fair Value								Average
Investment Type	(in millions)		Valuation Technique	Unobservable Input	Range				Range
Duke Energy
Electricity contracts	$	(84)	Discounted cash flow	Forward electricity curves – price per MWh	$	14.68	-	$151.84	$28.84
Duke Energy Ohio
FTRs	1		RTO auction pricing	FTR price – per MWh	0.25		-	1.68	0.79
Duke Energy Indiana
FTRs	6		RTO auction pricing	FTR price – per MWh	(2.40)		-	7.41	1.05
Duke Energy
Total Level 3 derivatives	$	(77)

OTHER FAIR VALUE DISCLOSURES

The fair value and book value of long-term debt, including current maturities, is summarized in the following table. Estimates determined are not necessarily indicative of amounts that could have been settled in current markets. Fair value of long-term debt uses Level 2 measurements.

	September 30, 2021				December 31, 2020
(in millions)	Book Value		Fair Value		Book Value		Fair Value
Duke Energy(a)	$	62,802	$	69,381	$	59,863	$	69,292
Duke Energy Carolinas	12,975		14,964		12,218		14,917
Progress Energy	19,488		22,593		19,264		23,470
Duke Energy Progress	9,848		10,915		9,258		10,862
Duke Energy Florida	7,549		8,932		7,915		9,756
Duke Energy Ohio	3,092		3,517		3,089		3,650
Duke Energy Indiana	4,092		4,883		4,091		5,204
Piedmont	2,968		3,320		2,780		3,306

(a)Book value of long-term debt includes $1.3 billion at September 30, 2021, and December 31, 2020, of net unamortized debt discount and premium of purchase accounting adjustments related to the mergers with Progress Energy and Piedmont that are excluded from fair value of long-term debt.

79

FINANCIAL STATEMENTS FAIR VALUE MEASUREMENTS

At both September 30, 2021, and December 31, 2020, fair value of cash and cash equivalents, accounts and notes receivable, accounts payable, notes payable and commercial paper and nonrecourse notes payable of VIEs are not materially different from their carrying amounts because of the short-term nature of these instruments and/or because the stated rates approximate market rates.

11. VARIABLE INTEREST ENTITIES

CONSOLIDATED VIEs

The obligations of the consolidated VIEs discussed in the following paragraphs are nonrecourse to the Duke Energy Registrants. The registrants have no requirement to provide liquidity to, purchase assets of or guarantee performance of these VIEs unless noted in the following paragraphs.

No financial support was provided to any of the consolidated VIEs during the nine months ended September 30, 2021, and the year ended December 31, 2020, or is expected to be provided in the future that was not previously contractually required.

Receivables Financing – DERF/DEPR/DEFR

DERF, DEPR and DEFR are bankruptcy remote, special purpose subsidiaries of Duke Energy Carolinas, Duke Energy Progress and Duke Energy Florida, respectively. DERF, DEPR and DEFR are wholly owned LLCs with separate legal existence from their parent companies, and their assets are not generally available to creditors of their parent companies. On a revolving basis, DERF, DEPR and DEFR buy certain accounts receivable arising from the sale of electricity and related services from their parent companies.

DERF, DEPR and DEFR borrow amounts under credit facilities to buy these receivables. Borrowing availability from the credit facilities is limited to the amount of qualified receivables purchased, which generally exclude receivables past due more than a predetermined number of days and reserves for expected past-due balances. The sole source of funds to satisfy the related debt obligations is cash collections from the receivables. Amounts borrowed under the credit facilities for DERF and DEPR are reflected on the Condensed Consolidated Balance Sheets as Long-Term Debt. Amounts borrowed under the credit facilities for DEFR are reflected on the Condensed Consolidated Balance Sheets as Current maturities of long-term debt.

The most significant activity that impacts the economic performance of DERF, DEPR and DEFR are the decisions made to manage delinquent receivables. Duke Energy Carolinas, Duke Energy Progress and Duke Energy Florida are considered the primary beneficiaries and consolidate DERF, DEPR and DEFR, respectively, as they make those decisions.

Receivables Financing – CRC

CRC is a bankruptcy remote, special purpose entity indirectly owned by Duke Energy. On a revolving basis, CRC buys certain accounts receivable arising from the sale of electricity, natural gas and related services from Duke Energy Ohio and Duke Energy Indiana. CRC borrows amounts under a credit facility to buy the receivables from Duke Energy Ohio and Duke Energy Indiana. Borrowing availability from the credit facility is limited to the amount of qualified receivables sold to CRC, which generally exclude receivables past due more than a predetermined number of days and reserves for expected past-due balances. The sole source of funds to satisfy the related debt obligation is cash collections from the receivables. Amounts borrowed under the credit facility are reflected on Duke Energy's Condensed Consolidated Balance Sheets as Long-Term Debt.

The proceeds Duke Energy Ohio and Duke Energy Indiana receive from the sale of receivables to CRC are approximately 75% cash and 25% in the form of a subordinated note from CRC. The subordinated note is a retained interest in the receivables sold. Depending on collection experience, additional equity infusions to CRC may be required by Duke Energy to maintain a minimum equity balance of $3 million.

CRC is considered a VIE because (i) equity capitalization is insufficient to support its operations, (ii) power to direct the activities that most significantly impact the economic performance of the entity is not held by the equity holder and (iii) deficiencies in net worth of CRC are funded by Duke Energy. The most significant activities that impact the economic performance of CRC are decisions made to manage delinquent receivables. Duke Energy is considered the primary beneficiary and consolidates CRC as it makes these decisions. Neither Duke Energy Ohio nor Duke Energy Indiana consolidate CRC.

Receivables Financing – Credit Facilities

The following table summarizes the amounts and expiration dates of the credit facilities and associated restricted receivables described above.

	Duke Energy
			Duke Energy		Duke Energy		Duke Energy
			Carolinas		Progress		Florida
(in millions)	CRC		DERF		DEPR		DEFR
Expiration date	February 2023		December 2022		April 2023		April 2023
Credit facility amount	$	350	$	475	$	350	$	250
Amounts borrowed at September 30, 2021	350		475		350		250
Amounts borrowed at December 31, 2020	350		364		250		250
Restricted Receivables at September 30, 2021	535		915		532		443
Restricted Receivables at December 31, 2020	547		696		500		397

Nuclear Asset-Recovery Bonds – DEFPF

DEFPF is a bankruptcy remote, wholly owned special purpose subsidiary of Duke Energy Florida. DEFPF was formed in 2016 for the sole purpose of issuing nuclear asset-recovery bonds to finance Duke Energy Florida's unrecovered regulatory asset related to Crystal River Unit 3.

80

FINANCIAL STATEMENTS VARIABLE INTEREST ENTITIES

In 2016, DEFPF issued senior secured bonds and used the proceeds to acquire nuclear asset-recovery property from Duke Energy Florida. The nuclear asset-recovery property acquired includes the right to impose, bill, collect and adjust a non-bypassable nuclear asset-recovery charge from all Duke Energy Florida retail customers until the bonds are paid in full and all financing costs have been recovered. The nuclear asset-recovery bonds are secured by the nuclear asset-recovery property and cash collections from the nuclear asset-recovery charges are the sole source of funds to satisfy the debt obligation. The bondholders have no recourse to Duke Energy Florida.

DEFPF is considered a VIE primarily because the equity capitalization is insufficient to support its operations. Duke Energy Florida has the power to direct the significant activities of the VIE as described above and therefore Duke Energy Florida is considered the primary beneficiary and consolidates DEFPF.

The following table summarizes the impact of DEFPF on Duke Energy Florida's Condensed Consolidated Balance Sheets.

(in millions)	September 30, 2021		December 31, 2020
Receivables of VIEs	$	6	$	4
Regulatory Assets: Current	54		53
Current Assets: Other	17		39
Other Noncurrent Assets: Regulatory assets	896		937
Current Liabilities: Other	2		10
Current maturities of long-term debt	56		55
Long-Term Debt	946		1,002

Commercial Renewables

Certain of Duke Energy’s renewable energy facilities are VIEs due to Duke Energy issuing guarantees for debt service and operations and maintenance reserves in support of debt financings. Assets are restricted and cannot be pledged as collateral or sold to third parties without prior approval of debt holders. Additionally, Duke Energy has VIEs associated with tax equity arrangements entered into with third-party investors in order to finance the cost of renewable assets eligible for tax credits. The activities that most significantly impacted the economic performance of these renewable energy facilities were decisions associated with siting, negotiating PPAs and Engineering, Procurement and Construction agreements, and decisions associated with ongoing operations and maintenance-related activities. Duke Energy is considered the primary beneficiary and consolidates the entities as it is responsible for all of these decisions.

The table below presents material balances reported on Duke Energy's Condensed Consolidated Balance Sheets related to Commercial Renewables VIEs.

(in millions)	September 30, 2021		December 31, 2020
Current Assets: Other	$	330	$	257
Property, Plant and Equipment: Cost	7,315		6,394
Accumulated depreciation and amortization	(1,414)		(1,242)
Other Noncurrent Assets: Other	110		67
Current maturities of long-term debt	165		167
Long-Term Debt	1,552		1,569
Other Noncurrent Liabilities: AROs	167		148
Other Noncurrent Liabilities: Other	341		316

NON-CONSOLIDATED VIEs

The following tables summarize the impact of non-consolidated VIEs on the Condensed Consolidated Balance Sheets.

	September 30, 2021
	Duke Energy						Duke		Duke
	Pipeline		Commercial				Energy		Energy
(in millions)	Investments		Renewables		Total		Ohio		Indiana
Receivables from affiliated companies	$	—	$	—	$	—	$	47	$	77
Investments in equity method unconsolidated affiliates	15		465		480		—		—
Deferred tax asset	58		—		58		—		—
Total assets	$	73	$	465	$	538	$	47	$	77
Other current liabilities	61		3		64		—		—
Other noncurrent liabilities	63		3		66		—		—
Total liabilities	$	124	$	6	$	130	$	—	$	—
Net (liabilities) assets	$	(51)	$	459	$	408	$	47	$	77

81

FINANCIAL STATEMENTS VARIABLE INTEREST ENTITIES

	December 31, 2020
	Duke Energy						Duke		Duke
	Pipeline		Commercial				Energy		Energy
(in millions)	Investments		Renewables		Total		Ohio		Indiana
Receivables from affiliated companies	$	—	$	—	$	—	$	83	$	110
Investments in equity method unconsolidated affiliates	—		530		530		—		—
Other noncurrent assets	31		—		31		—		—
Total assets	$	31	$	530	$	561	$	83	$	110
Other current liabilities	928		5		933		—		—
Other noncurrent liabilities	8		10		18		—		—
Total liabilities	$	936	$	15	$	951	$	—	$	—
Net assets (liabilities)	$	(905)	$	515	$	(390)	$	83	$	110

The Duke Energy Registrants are not aware of any situations where the maximum exposure to loss significantly exceeds the carrying values shown above except for certain renewable energy project entities guarantees for debt services and operations and maintenance, as discussed below.

Pipeline Investments

Duke Energy has investments in various joint ventures to construct and operate pipeline projects. These entities are considered VIEs due to having insufficient equity to finance their own activities without subordinated financial support. Duke Energy does not have the power to direct the activities that most significantly impact the economic performance, the obligation to absorb losses or the right to receive benefits of these VIEs and therefore does not consolidate these entities.

Duke Energy has a 47% ownership interest in ACP. For the three and nine months ended September 30, 2020, the ACP investment was considered a significant subsidiary because its loss exceeded 10% of Duke Energy’s income. ACP's net loss for the three and nine months ended September 30, 2020, was $163 million and $4,505 million, respectively.

In 2020, Duke Energy determined that it would no longer invest in the construction of the ACP pipeline. In February 2021, Duke Energy paid approximately $855 million to fund ACP's outstanding debt, relieving Duke Energy of its guarantee. See Notes 1 and 3 for further information regarding this transaction.

Commercial Renewables

Duke Energy has investments in various renewable energy project entities. Duke Energy has a 50% ownership in a VIE, which owns a portfolio of wind projects. This entity is a VIE as a result of Duke Energy issuing guarantees for debt service and operations and maintenance reserves in support of debt financings. Duke Energy does not consolidate this VIE because power to direct and control key activities is shared jointly by Duke Energy and the other owner. Duke Energy also has equity ownership in an entity, which owns a portfolio of fuel cell projects. Duke Energy does not consolidate the fuel cell portfolio as it does not have the power to direct the activities that most significantly impact the economic performance of the entity.

OVEC

Duke Energy Ohio’s 9% ownership interest in OVEC is considered a non-consolidated VIE due to OVEC having insufficient equity to finance its activities without subordinated financial support. The activities that most significantly impact OVEC's economic performance include fuel strategy and supply activities and decisions associated with ongoing operations and maintenance-related activities. Duke Energy Ohio does not have the unilateral power to direct these activities, and therefore, does not consolidate OVEC.

As a counterparty to an Inter-Company Power Agreement (ICPA), Duke Energy Ohio has a contractual arrangement to receive entitlements to capacity and energy from OVEC’s power plants through June 2040 commensurate with its power participation ratio, which is equivalent to Duke Energy Ohio's ownership interest. Costs, including fuel, operating expenses, fixed costs, debt amortization and interest expense, are allocated to counterparties to the ICPA based on their power participation ratio. The value of the ICPA is subject to variability due to fluctuation in power prices and changes in OVEC's cost of business. Duke Energy cannot predict the outcome in this matter. See Note 3 for additional information.

CRC

See discussion under Consolidated VIEs for additional information related to CRC.

Amounts included in Receivables from affiliated companies in the above table for Duke Energy Ohio and Duke Energy Indiana reflect their retained interest in receivables sold to CRC. These subordinated notes held by Duke Energy Ohio and Duke Energy Indiana are stated at fair value.

The following table shows the gross and net receivables sold.

	Duke Energy Ohio				Duke Energy Indiana
(in millions)	September 30, 2021		December 31, 2020		September 30, 2021		December 31, 2020
Receivables sold	$	218	$	270	$	328	$	344
Less: Retained interests	47		83		77		110
Net receivables sold	$	171	$	187	$	251	$	234

82

FINANCIAL STATEMENTS VARIABLE INTEREST ENTITIES

The following table shows sales and cash flows related to receivables sold.

	Duke Energy Ohio								Duke Energy Indiana
	Three Months Ended				Nine Months Ended				Three Months Ended				Nine Months Ended
	September 30,				September 30,				September 30,				September 30,
(in millions)	2021		2020		2021		2020		2021		2020		2021		2020
Sales
Receivables sold	$	486	$	462	$	1,490	$	1,428	$	794	$	717	$	2,176	$	1,947
Loss recognized on sale	2		2		7		8		4		3		10		9
Cash flows
Cash proceeds from receivables sold	$	490	$	449	$	1,519	$	1,439	$	798	$	689	$	2,199	$	1,941
Collection fees received	—		1		1		1		—		—		1		1
Return received on retained interests	1		1		3		3		1		1		4		4

Cash flows from sales of receivables are reflected within Cash Flows From Operating Activities and Cash Flows from Investing Activities on Duke Energy Ohio’s and Duke Energy Indiana’s Condensed Consolidated Statements of Cash Flows.

12. REVENUE

Duke Energy earns substantially all of its revenues through its reportable segments, Electric Utilities and Infrastructure, Gas Utilities and Infrastructure and Commercial Renewables.

Electric Utilities and Infrastructure

Electric Utilities and Infrastructure earns the majority of its revenues through retail and wholesale electric service through the generation, transmission, distribution and sale of electricity. Duke Energy generally provides retail and wholesale electric service customers with their full electric load requirements or with supplemental load requirements when the customer has other sources of electricity.

The majority of wholesale revenues are full requirements contracts where the customers purchase the substantial majority of their energy needs and do not have a fixed quantity of contractually required energy or capacity. As such, related forecasted revenues are considered optional purchases. Supplemental requirements contracts that include contracted blocks of energy and capacity at contractually fixed prices have the following estimated remaining performance obligations:

	Remaining Performance Obligations
(in millions)	2021		2022		2023		2024		2025		Thereafter		Total
Progress Energy	$	24	$	107	$	44	$	45	$	7	$	51	$	278
Duke Energy Progress	2		8		8		8		—		—		26
Duke Energy Florida	22		99		36		37		7		51		252
Duke Energy Indiana	—		1		9		14		15		25		64

Revenues for block sales are recognized monthly as energy is delivered and stand-ready service is provided, consistent with invoiced amounts and unbilled estimates.

Gas Utilities and Infrastructure

Gas Utilities and Infrastructure earns its revenue through retail and wholesale natural gas service through the transportation, distribution and sale of natural gas. Duke Energy generally provides retail and wholesale natural gas service customers with all natural gas load requirements. Additionally, while natural gas can be stored, substantially all natural gas provided by Duke Energy is consumed by customers simultaneously with receipt of delivery.

Fixed-capacity payments under long-term contracts for the Gas Utilities and Infrastructure segment include minimum margin contracts and supply arrangements with municipalities and power generation facilities. Revenues for related sales are recognized monthly as natural gas is delivered and stand-ready service is provided, consistent with invoiced amounts and unbilled estimates. Estimated remaining performance obligations are as follows:

	Remaining Performance Obligations
(in millions)	2021		2022		2023		2024		2025		Thereafter		Total
Piedmont	$	17	$	67	$	64	$	61	$	60	$	336	$	605

Commercial Renewables

Commercial Renewables earns the majority of its revenues through long-term PPAs and generally sells all of its wind and solar facility output, electricity and Renewable Energy Certificates (RECs) to customers. Some of these PPAs have been accounted for as leases. For PPAs that are not accounted for as leases, the delivery of electricity and the delivery of RECs are considered separate performance obligations.

Other

The remainder of Duke Energy’s operations is presented as Other, which does not include material revenues from contracts with customers.

83

FINANCIAL STATEMENTS REVENUE

Disaggregated Revenues

Disaggregated revenues are presented as follows:

	Three Months Ended September 30, 2021
			Duke				Duke		Duke		Duke		Duke
(in millions)	Duke		Energy		Progress		Energy		Energy		Energy		Energy
By market or type of customer	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Electric Utilities and Infrastructure
Residential	$	2,955	$	892	$	1,525	$	619	$	906	$	223	$	316	$	—
General	1,873		685		826		400		426		119		240		—
Industrial	861		360		264		195		69		35		202		—
Wholesale	619		111		399		324		75		19		89		—
Other revenues	252		72		198		118		80		17		23		—
Total Electric Utilities and Infrastructure revenue from contracts with customers	$	6,560	$	2,120	$	3,212	$	1,656	$	1,556	$	413	$	870	$	—
Gas Utilities and Infrastructure
Residential	$	129	$	—	$	—	$	—	$	—	$	62	$	—	$	66
Commercial	78		—		—		—		—		24		—		58
Industrial	30		—		—		—		—		3		—		26
Power Generation	—		—		—		—		—		—		—		23
Other revenues	33		—		—		—		—		4		—		9
Total Gas Utilities and Infrastructure revenue from contracts with customers	$	270	$	—	$	—	$	—	$	—	$	93	$	—	$	182
Commercial Renewables
Revenue from contracts with customers	$	56	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other
Revenue from contracts with customers	$	8	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Total revenue from contracts with customers	$	6,894	$	2,120	$	3,212	$	1,656	$	1,556	$	506	$	870	$	182
Other revenue sources(a)	$	57	$	(16)	$	21	$	11	$	5	$	—	$	16	$	13
Total revenues	$	6,951	$	2,104	$	3,233	$	1,667	$	1,561	$	506	$	886	$	195

(a)Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues.

84

FINANCIAL STATEMENTS REVENUE

	Three Months Ended September 30, 2020
			Duke				Duke		Duke		Duke		Duke
(in millions)	Duke		Energy		Progress		Energy		Energy		Energy		Energy
By market or type of customer	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Electric Utilities and Infrastructure
Residential	$	2,936	$	883	$	1,550	$	616	$	934	$	213	$	289	$	—
General	1,804		664		805		384		421		119		212		—
Industrial	797		342		245		179		66		35		175		—
Wholesale	603		117		412		358		54		10		64		—
Other revenues	238		62		167		75		92		23		22		—
Total Electric Utilities and Infrastructure revenue from contracts with customers	$	6,378	$	2,068	$	3,179	$	1,612	$	1,567	$	400	$	762	$	—
Gas Utilities and Infrastructure
Residential	$	112	$	—	$	—	$	—	$	—	$	55	$	—	$	57
Commercial	64		—		—		—		—		20		—		44
Industrial	24		—		—		—		—		3		—		22
Power Generation	—		—		—		—		—		—		—		10
Other revenues	16		—		—		—		—		3		—		11
Total Gas Utilities and Infrastructure revenue from contracts with customers	$	216	$	—	$	—	$	—	$	—	$	81	$	—	$	144
Commercial Renewables
Revenue from contracts with customers	$	57	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other
Revenue from contracts with customers	$	7	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Total revenue from contracts with customers	$	6,658	$	2,068	$	3,179	$	1,612	$	1,567	$	481	$	762	$	144
Other revenue sources(a)	$	63	$	(10)	$	18	$	14	$	—	$	(8)	$	(1)	$	18
Total revenues	$	6,721	$	2,058	$	3,197	$	1,626	$	1,567	$	473	$	761	$	162

(a)Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues.

85

FINANCIAL STATEMENTS REVENUE

	Nine Months Ended September 30, 2021
			Duke				Duke		Duke		Duke		Duke
(in millions)	Duke		Energy		Progress		Energy		Energy		Energy		Energy
By market or type of customer	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Electric Utilities and Infrastructure
Residential	$	7,753	$	2,368	$	3,903	$	1,657	$	2,246	$	589	$	894	$	—
General	4,805		1,685		2,170		1,036		1,134		329		619		—
Industrial	2,228		872		700		500		200		99		558		—
Wholesale	1,644		341		1,056		901		155		45		202		—
Other revenues	712		208		509		272		237		61		64		—
Total Electric Utilities and Infrastructure revenue from contracts with customers	$	17,142	$	5,474	$	8,338	$	4,366	$	3,972	$	1,123	$	2,337	$	—
Gas Utilities and Infrastructure
Residential	$	747	$	—	$	—	$	—	$	—	$	241	$	—	$	505
Commercial	373		—		—		—		—		99		—		273
Industrial	110		—		—		—		—		14		—		96
Power Generation	—		—		—		—		—		—		—		69
Other revenues	100		—		—		—		—		21		—		34
Total Gas Utilities and Infrastructure revenue from contracts with customers	$	1,330	$	—	$	—	$	—	$	—	$	375	$	—	$	977
Commercial Renewables
Revenue from contracts with customers	$	163	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other
Revenue from contracts with customers	$	20	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Total Revenue from contracts with customers	$	18,655	$	5,474	$	8,338	$	4,366	$	3,972	$	1,498	$	2,337	$	977
Other revenue sources(a)	$	204	$	(44)	$	79	$	51	$	15	$	(4)	$	29	$	39
Total revenues	$	18,859	$	5,430	$	8,417	$	4,417	$	3,987	$	1,494	$	2,366	$	1,016

(a)Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues.

86

FINANCIAL STATEMENTS REVENUE

	Nine Months Ended September 30, 2020
			Duke				Duke		Duke		Duke		Duke
(in millions)	Duke		Energy		Progress		Energy		Energy		Energy		Energy
By market or type of customer	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Electric Utilities and Infrastructure
Residential	$	7,451	$	2,316	$	3,792	$	1,578	$	2,214	$	558	$	785	$	—
General	4,691		1,720		2,080		1,001		1,079		336		554		—
Industrial	2,148		871		673		487		186		103		502		—
Wholesale	1,535		332		1,018		877		141		22		163		—
Other revenues	713		184		476		208		268		62		63		—
Total Electric Utilities and Infrastructure revenue from contracts with customers	$	16,538	$	5,423	$	8,039	$	4,151	$	3,888	$	1,081	$	2,067	$	—
Gas Utilities and Infrastructure
Residential	$	631	$	—	$	—	$	—	$	—	$	214	$	—	$	417
Commercial	308		—		—		—		—		86		—		222
Industrial	92		—		—		—		—		12		—		80
Power Generation	—		—		—		—		—		—		—		27
Other revenues	58		—		—		—		—		12		—		46
Total Gas Utilities and Infrastructure revenue from contracts with customers	$	1,089	$	—	$	—	$	—	$	—	$	324	$	—	$	792
Commercial Renewables
Revenue from contracts with customers	$	170	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other
Revenue from contracts with customers	$	20	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Total Revenue from contracts with customers	$	17,817	$	5,423	$	8,039	$	4,151	$	3,888	$	1,405	$	2,067	$	792
Other revenue sources(a)	$	274	$	(7)	$	78	$	56	$	9	$	(11)	$	3	$	79
Total revenues	$	18,091	$	5,416	$	8,117	$	4,207	$	3,897	$	1,394	$	2,070	$	871

(a)Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues.

87

FINANCIAL STATEMENTS REVENUE

As described in Note 1, Duke Energy adopted the new guidance for credit losses effective January 1, 2020, using the modified retrospective method of adoption, which does not require restatement of prior year reported results. The following table presents the reserve for credit losses for trade and other receivables based on adoption of the new standard.

	Three Months Ended September 30, 2020 and 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Balance at June 30, 2020	$	102	$	14	$	29	$	14	$	14	$	5	$	3	$	6
Write-Offs	12		(2)		15		13		2		—		—		—
Credit Loss Expense	(9)		—		(16)		(15)		—		—		—		3
Other Adjustments	28		10		9		9		—		—		—		—
Balance at September 30, 2020	$	133	$	22	$	37	$	21	$	16	$	5	$	3	$	9
Balance at June 30, 2021	$	123	$	42	$	36	$	21	$	16	$	4	$	3	$	13
Write-Offs	(13)		(3)		(6)		(3)		(3)		—		—		(4)
Credit Loss Expense	11		4		6		3		3		—		—		2
Other Adjustments	2		(1)		—		—		—		—		—		4
Balance at September 30, 2021	$	123	$	42	$	36	$	21	$	16	$	4	$	3	$	15
	Nine Months Ended September 30, 2020 and 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Balance at December 31, 2019	$	76	$	10	$	16	$	8	$	7	$	4	$	3	$	6
Cumulative Change in Accounting Principle	5		1		2		1		1		—		—		1
Write-Offs	(7)		(8)		8		8		—		—		—		(5)
Credit Loss Expense	24		9		2		(5)		8		1		—		7
Other Adjustments	35		10		9		9		—		—		—		—
Balance at September 30, 2020	$	133	$	22	$	37	$	21	$	16	$	5	$	3	$	9
Balance at December 31, 2020	$	146	$	23	$	37	$	23	$	14	$	4	$	3	$	12
Write-Offs	(39)		(10)		(20)		(11)		(9)		—		—		(7)
Credit Loss Expense	40		20		19		9		10		—		—		6
Other Adjustments	(24)		9		—		—		1		—		—		4
Balance at September 30, 2021	$	123	$	42	$	36	$	21	$	16	$	4	$	3	$	15

Trade and other receivables are evaluated based on an estimate of the risk of loss over the life of the receivable and current and historical conditions using supportable assumptions. Management evaluates the risk of loss for trade and other receivables by comparing the historical write-off amounts to total revenue over a specified period. Historical loss rates are adjusted due to the impact of current conditions, as well as forecasted conditions over a reasonable time period. The calculated write-off rate can be applied to the receivable balance for which an established reserve does not already exist. Management reviews the assumptions and risk of loss periodically for trade and other receivables.

The aging of trade receivables is presented in the table below. Duke Energy considers receivables greater than 30 days outstanding past due.

	September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Unbilled Revenue(a)(b)	$	826	$	308	$	242	$	125	$	117	$	5	$	27	$	7
0-30 days	2,201		689		910		521		388		65		41		80
30-60 days	194		74		63		37		26		7		5		6
60-90 days	57		30		14		6		8		1		1		3
90+ days	161		68		27		5		22		31		10		9
Deferred Payment Arrangements(c)	113		66		29		21		8		2		—		6
Trade and Other Receivables	$	3,552	$	1,235	$	1,285	$	715	$	569	$	111	$	84	$	111

88

FINANCIAL STATEMENTS REVENUE

	December 31, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Unbilled Revenue(a)(b)	$	969	$	328	$	283	$	167	$	116	$	2	$	16	$	86
0-30 days	1,789		445		707		398		307		60		26		149
30-60 days	185		80		54		25		29		8		3		8
60-90 days	22		1		10		4		6		2		1		3
90+ days	119		16		32		9		23		30		12		9
Deferred Payment Arrangements(c)	215		96		80		52		28		—		—		7
Trade and Other Receivables	$	3,299	$	966	$	1,166	$	655	$	509	$	102	$	58	$	262

(a)Unbilled revenues are recognized by applying customer billing rates to the estimated volumes of energy or natural gas delivered but not yet billed and are included within Receivables and Receivables of VIEs on the Condensed Consolidated Balance Sheets.

(b)Duke Energy Ohio and Duke Energy Indiana sell, on a revolving basis, nearly all of their retail accounts receivable, including receivables for unbilled revenues, to an affiliate, CRC, and account for the transfers of receivables as sales. Accordingly, the receivables sold are not reflected on the Condensed Consolidated Balance Sheets of Duke Energy Ohio and Duke Energy Indiana. See Note 11 for further information. These receivables for unbilled revenues are $64 million and $115 million for Duke Energy Ohio and Duke Energy Indiana, respectively, as of September 30, 2021, and $87 million and $134 million for Duke Energy Ohio and Duke Energy Indiana, respectively, as of December 31, 2020.

(c)Due to certain customer financial hardships created by the COVID-19 pandemic and resulting stay-at-home orders, Duke Energy permitted customers to defer payment of past-due amounts through an installment payment plan over a period of several months.

13. STOCKHOLDERS' EQUITY

Basic EPS is computed by dividing net income available to Duke Energy common stockholders, as adjusted for distributed and undistributed earnings allocated to participating securities and accumulated preferred dividends, by the weighted average number of common shares outstanding during the period. Diluted EPS is computed by dividing net income available to Duke Energy common stockholders, as adjusted for distributed and undistributed earnings allocated to participating securities and accumulated preferred dividends, by the diluted weighted average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that could occur if securities or other agreements to issue common stock, such as equity forward sale agreements, were exercised or settled. Duke Energy’s participating securities are restricted stock units that are entitled to dividends declared on Duke Energy common stock during the restricted stock unit’s vesting periods. Dividends declared on preferred stock are recorded on the Condensed Consolidated Statements of Operations as a reduction of net income to arrive at net income available to Duke Energy common stockholders. Dividends accumulated on preferred stock are an adjustment to net income used in the calculation of basic and diluted EPS.

The following table presents Duke Energy’s basic and diluted EPS calculations, the weighted average number of common shares outstanding and common and preferred share dividends declared.

	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions, except per share amounts)	2021		2020		2021		2020
Net income available to Duke Energy common stockholders	$	1,366	$	1,265	$	3,070	$	1,347
Accumulated preferred stock dividends adjustment	12		12		12		13
Less: Impact of participating securities	1		1		3		2
Income from continuing operations available to Duke Energy common stockholders	$	1,377	$	1,276	$	3,079	$	1,358
Weighted average common shares outstanding – basic and diluted	769		735		769		735
EPS available to Duke Energy common stockholders
Basic and diluted	$	1.79	$	1.74	$	4.00	$	1.85
Potentially dilutive items excluded from the calculation(a)	2		2		2		2
Dividends declared per common share	$	0.985	$	0.965	$	2.915	$	2.855
Dividends declared on Series A preferred stock per depositary share(b)	$	0.359	$	0.359	$	1.078	$	1.078
Dividends declared on Series B preferred stock per share(c)	$	24.375	$	24.375	$	48.750	$	49.292

(a)Performance stock awards were not included in the dilutive securities calculation because the performance measures related to the awards had not been met.

(b)5.75% Series A Cumulative Redeemable Perpetual Preferred Stock dividends are payable quarterly in arrears on the 16th day of March, June, September and December. The preferred stock has a $25 liquidation preference per depositary share.

(c)4.875% Series B Fixed-Rate Reset Cumulative Redeemable Perpetual Preferred Stock dividends are payable semiannually in arrears on the 16th day of March and September. The preferred stock has a $1,000 liquidation preference per share.

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FINANCIAL STATEMENTS EMPLOYEE BENEFIT PLANS

14. EMPLOYEE BENEFIT PLANS

DEFINED BENEFIT RETIREMENT PLANS

Duke Energy and certain subsidiaries maintain, and the Subsidiary Registrants participate in, qualified and non-qualified, non-contributory defined benefit retirement plans. Duke Energy's policy is to fund amounts on an actuarial basis to provide assets sufficient to meet benefit payments to be paid to plan participants.

Duke Energy monitors lump-sum benefit payment activity associated with its defined benefit retirement plans. Duke Energy does not believe it is probable that total lump-sum benefit payments will exceed the settlement threshold, defined as the sum of service cost and interest cost on projected benefit obligation components of net periodic pension costs, for any of its defined benefit retirement plans in 2021. If Duke Energy believed it were probable that total lump-sum benefit payments would exceed the settlement threshold in 2021, then a settlement charge reflecting the recognition of a pro-rata portion of previously unrecognized actuarial losses, equal to the percentage of reduction in the projected benefit obligation resulting from total lump-sum benefit payments, would be recognized.

QUALIFIED PENSION PLANS

The following tables include the components of net periodic pension costs for qualified pension plans.

	Three Months Ended September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Service cost	$	43	$	14	$	13	$	7	$	5	$	2	$	2	$	1
Interest cost on projected benefit obligation	55		13		17		8		10		2		5		2
Expected return on plan assets	(139)		(36)		(47)		(21)		(25)		(7)		(10)		(5)
Amortization of actuarial loss	33		7		10		5		5		2		3		2
Amortization of prior service credit	(7)		(2)		(1)		—		(1)		—		—		(1)
Amortization of settlement charges	2		1		1		—		—		—		—		1
Net periodic pension costs	$	(13)	$	(3)	$	(7)	$	(1)	$	(6)	$	(1)	$	—	$	—

	Three Months Ended September 30, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Service cost	$	41	$	12	$	12	$	6	$	5	$	1	$	2	$	1
Interest cost on projected benefit obligation	67		16		21		10		12		4		6		2
Expected return on plan assets	(143)		(36)		(48)		(22)		(25)		(7)		(11)		(5)
Amortization of actuarial loss	32		7		10		4		6		2		3		2
Amortization of prior service credit	(8)		(2)		—		—		—		—		—		(2)
Amortization of settlement charges	11		6		5		5		1		—		1		1
Net periodic pension costs	$	—	$	3	$	—	$	3	$	(1)	$	—	$	1	$	(1)

	Nine Months Ended September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Service cost	$	131	$	42	$	38	$	22	$	16	$	4	$	7	$	4
Interest cost on projected benefit obligation	165		38		52		23		29		9		14		6
Expected return on plan assets	(418)		(106)		(141)		(63)		(76)		(21)		(30)		(15)
Amortization of actuarial loss	100		22		29		14		15		5		10		7
Amortization of prior service credit	(22)		(6)		(2)		(1)		(1)		—		(1)		(6)
Amortization of settlement charges	6		4		2		1		—		—		—		1
Net periodic pension costs	$	(38)	$	(6)	$	(22)	$	(4)	$	(17)	$	(3)	$	—	$	(3)

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FINANCIAL STATEMENTS EMPLOYEE BENEFIT PLANS

	Nine Months Ended September 30, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Service cost	$	124	$	38	$	36	$	20	$	16	$	3	$	6	$	4
Interest cost on projected benefit obligation	202		47		64		29		35		12		17		7
Expected return on plan assets	(429)		(108)		(143)		(66)		(76)		(21)		(32)		(16)
Amortization of actuarial loss	96		21		30		13		17		5		9		7
Amortization of prior service credit	(24)		(6)		(2)		(1)		(1)		—		(1)		(7)
Amortization of settlement charges	16		8		6		6		1		—		1		1
Net periodic pension costs	$	(15)	$	—	$	(9)	$	1	$	(8)	$	(1)	$	—	$	(4)

NON-QUALIFIED PENSION PLANS

Net periodic pension costs for non-qualified pension plans were not material for the three and nine months ended September 30, 2021, and 2020.

OTHER POST-RETIREMENT BENEFIT PLANS

Net periodic costs for OPEB plans were not material for the three and nine months ended September 30, 2021, and 2020.

15. INCOME TAXES

EFFECTIVE TAX RATES

The ETRs from continuing operations for each of the Duke Energy Registrants are included in the following table.

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Duke Energy	6.6	%	7.8	%	6.7	%	(6.4)	%
Duke Energy Carolinas	2.9	%	12.0	%	3.6	%	13.6	%
Progress Energy	12.9	%	10.4	%	11.5	%	13.4	%
Duke Energy Progress	6.3	%	3.1	%	5.9	%	10.0	%
Duke Energy Florida	19.1	%	21.4	%	19.1	%	20.3	%
Duke Energy Ohio	13.4	%	16.7	%	15.3	%	16.6	%
Duke Energy Indiana	15.8	%	19.6	%	16.3	%	19.4	%
Piedmont	25.0	%	16.7	%	8.4	%	3.7	%

The decrease in the ETR for Duke Energy for the three months ended September 30, 2021, was primarily due to an increase in the amortization of excess deferred taxes.

The increase in the ETR for Duke Energy for the nine months ended September 30, 2021, was primarily due to the cancellation of the ACP pipeline project recorded in the prior year, partially offset by an increase in the amortization of excess deferred taxes.

The decrease in the ETR for Duke Energy Carolinas for the three and nine months ended September 30, 2021, was primarily due to an increase in the amortization of excess deferred taxes.

The increase in the ETR for Progress Energy for the three months ended September 30, 2021, was primarily due to a decrease in the amortization of excess deferred taxes.

The decrease in the ETR for Progress Energy for the nine months ended September 30, 2021, was primarily due to an increase in the amortization of excess deferred taxes.

The increase in the ETR for Duke Energy Progress for the three months ended September 30, 2021, was primarily due to a decrease in the amortization of excess deferred taxes.

The decrease in the ETR for Duke Energy Progress for the nine months ended September 30, 2021, was primarily due to an increase in the amortization of excess deferred taxes.

The decrease in the ETR for Duke Energy Florida for the three and nine months ended September 30, 2021, was primarily due to unfavorable tax adjustments in the prior year.

The decrease in the ETR for Duke Energy Ohio for the three and nine months ended September 30, 2021, was primarily due to an increase in the amortization of excess deferred taxes.

The decrease in the ETR for Duke Energy Indiana for the three and nine months ended September 30, 2021, was primarily due to an increase in the amortization of excess deferred taxes.

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FINANCIAL STATEMENTS INCOME TAXES

The increase in the ETR for Piedmont for the three months ended September 30, 2021, was primarily due to a certain favorable tax credits.

The increase in the ETR for Piedmont for the nine months ended September 30, 2021, was primarily due to a decrease in AFUDC equity.

16. SUBSEQUENT EVENTS

For information on subsequent events related to regulatory matters, commitments and contingencies and debt and credit facilities, see Notes 3, 4 and 5.

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MD&A DUKE ENERGY

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following combined Management’s Discussion and Analysis of Financial Condition and Results of Operations is separately filed by Duke Energy and Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida, Duke Energy Ohio, Duke Energy Indiana and Piedmont. However, none of the registrants make any representation as to information related solely to Duke Energy or the Subsidiary Registrants of Duke Energy other than itself.

DUKE ENERGY

Duke Energy is an energy company headquartered in Charlotte, North Carolina. Duke Energy operates in the U.S. primarily through its subsidiaries, Duke Energy Carolinas, Duke Energy Progress, Duke Energy Florida, Duke Energy Ohio, Duke Energy Indiana and Piedmont. When discussing Duke Energy’s consolidated financial information, it necessarily includes the results of the Subsidiary Registrants, which, along with Duke Energy, are collectively referred to as the Duke Energy Registrants.

Management’s Discussion and Analysis should be read in conjunction with the Condensed Consolidated Financial Statements and Notes for the nine months ended September 30, 2021, and with Duke Energy’s Annual Report on Form 10-K for the year ended December 31, 2020.

Executive Overview

Advancing Our Clean Energy Transformation

During the third quarter, we continued to execute on our clean energy transformation, delivering strong, sustainable value for shareholders, customers, communities and employees.

•In October 2021, North Carolina House Bill 951 was signed into law after legislative leaders announced bipartisan support for new state policy that would accelerate a clean energy transition for generation serving customers in the Carolinas, including providing a framework for a goal of 70% carbon reduction in electric generation from 2005 levels by 2030 and carbon neutrality by 2050 while continuing to prioritize affordability and reliability for our customers, who are located in both North and South Carolina. The legislation establishes a framework overseen by the NCUC to advance state CO2 emission reductions through the use of least cost planning, including stakeholder involvement, and also introduces modernized recovery mechanisms, including multi-year rate plans, that promote more efficient recovery of investments and align incentives between the company and the state’s energy policy objectives. The goals for a clean energy transition are generally consistent with Duke Energy Carolinas' and Duke Energy Progress' resource planning filings with the PSCSC.

•Also in October 2021, the Southeast Energy Exchange Market (SEEM) received clearance from the FERC. The new SEEM platform will facilitate sub-hourly, bilateral trading, allowing participants to buy and sell power close to the time the energy is consumed, utilizing available unreserved transmission. Southeastern electricity customers are expected to see cost, reliability and environmental benefits.

•In a significant move to support the company’s path to net-zero strategy, in September 2021 we completed the first phase of the investment of a 19.9% minority interest in Duke Energy Indiana by an affiliate of GIC, transferring 11.05% interest in exchange for approximately $1.025 billion. The proceeds from the $2.05 billion investment are expected to address common equity needs through 2025 to partially fund the company’s $59 billion capital and investment expenditure plan. This plan includes grid improvement, investments in clean energy and an improved customer experience – keys to our strategy to reduce carbon emissions from electricity generation to net-zero by 2050.

•In September 2021, we announced Ledyard Windpower, a 207-MW project and our first wind farm in Iowa. Once in operation next year, this project will increase the company’s U.S. wind capacity to over 3,100 MW.

•In August 2021, we announced a partnership with Accenture and Microsoft to develop a novel technology platform with the intent of measuring baseline methane emissions from natural gas distribution systems with a high level of accuracy in near real time. Once deployed, we expect the use of satellite technology and the new platform will increase the speed of a field response team’s ability to identify and repair methane leaks along distribution lines and systems.

Regulatory Activity. During the third quarter of 2021, we continued to move our regulatory strategy forward. See Note 3 to the Condensed Consolidated Financial Statements, "Regulatory Matters," for additional information.

•In October 2021, Duke Energy Ohio filed a request to review the company’s electric distribution rates, seeking approval to increase current electric distribution rates by approximately $55 million. Duke Energy Ohio has invested more than $800 million in a variety of capital projects across southwest Ohio since it last requested a regulatory review of its electric distribution rates in 2017. Also, in October 2021, Duke Energy Kentucky reached a constructive natural gas rate case settlement with the Attorney General, subject to review and approval of the KPSC.

•In September 2021, Piedmont Natural Gas, the Public Staff of the NCUC, the Carolina Utility Customers Association, Inc., and the Carolina Industrial Group for Fair Utility Rates IV, filed a stipulation resolving all issues between these parties related to Piedmont’s rate case filed in March 2021. This constructive outcome provided for a return on equity of 9.60% and 51.60% equity component of the capital structure resulting in an overall rate of return of 6.90%, with an increase in pretax income (base rates) of approximately $67 million. The Stipulation is subject to the review and approval of the NCUC.

•We received approximately $418 million of coal ash insurance litigation proceeds from our settlements with insurer-defendants. Proceeds will be distributed in accordance with the terms of the CCR settlement agreement.

Matters Impacting Future Results

The matters discussed herein could materially impact the future operating results, financial condition and cash flows of the Duke Energy Registrants and Business Segments.

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MD&A MATTERS IMPACTING FUTURE RESULTS

Regulatory Matters

Coal Ash Costs

As a result of the NCDEQ settlement on December 31, 2019, Duke Energy Carolinas and Duke Energy Progress agreed to excavate seven of the nine remaining coal ash basins in North Carolina with ash moved to on-site lined landfills. At the two remaining basins, uncapped basin ash will be excavated and moved to off-site lined landfills. The majority of spend is expected to occur over the next 15-20 years. In January 2021, Duke Energy Carolinas and Duke Energy Progress reached a settlement agreement on recovery of coal ash costs as outlined in Note 3, "Regulatory Matters." The company agreed not to seek recovery of approximately $1 billion of deferred coal ash expenditures and Duke Energy Carolinas and Duke Energy Progress took a charge of approximately $500 million each in 2020. On March 31, 2021, and April 16, 2021, the NCUC approved the coal ash settlement for Duke Energy Carolinas and Duke Energy Progress, respectively.

Duke Energy Indiana has interpreted the CCR rule to identify the coal ash basin sites impacted and has assessed the amounts of coal ash subject to the rule and a method of compliance. In 2020, the Hoosier Environmental Council filed a petition challenging the Indiana Department of Environmental Management's (IDEM) partial approval of five of Duke Energy Indiana’s ash pond site closure plans at Gallagher Station. The petition does not challenge the other 13 basin closures approved by IDEM at other Indiana stations. Interpretation of the requirements of the CCR rule is subject to further legal challenges and regulatory approvals, which could result in additional ash basin closure requirements, higher costs of compliance and greater AROs. Additionally, Duke Energy Indiana has retired facilities that are not subject to the CCR rule. Duke Energy Indiana may incur costs at these facilities to comply with environmental regulations or to mitigate risks associated with on-site storage of coal ash.

MGP

Duke Energy Ohio and other parties have filed with the PUCO a Stipulation and Recommendation that would resolve all open issues regarding manufactured gas plant remediation costs incurred between 2013 and 2019, including Duke Energy Ohio's request for additional deferral authority beyond 2019, and the pending issues related to the Tax Act as it relates to Duke Energy Ohio's natural gas operations. These impacts, if approved by the PUCO, are not expected to have a material impact on Duke Energy Ohio's financial statements. Failure to approve the Stipulation and Recommendation, disallowance of costs incurred, failure to complete the work by the deadline or failure to obtain an extension from the PUCO could result in an adverse impact.

For additional information, see Notes 3 and 4 to the Condensed Consolidated Financial Statements, “Regulatory Matters” and "Commitments and Contingencies," respectively.

Commercial Renewables

Duke Energy continues to monitor recoverability of renewable merchant plants located in the Electric Reliability Council of Texas West market and in the PJM West market, due to fluctuating market pricing and long-term forecasted energy prices. Based on the most recent recoverability test, the carrying value approximated the aggregate estimated future undiscounted cash flows for the assets under review. A continued decline in energy market pricing or other factors unfavorably impacting the economics would likely result in a future impairment. Impairment of these assets could result in adverse impacts. For additional information, see Note 2 to the Condensed Consolidated Financial Statements, "Business Segments."

In February 2021, a severe winter storm impacted certain Commercial Renewables assets in Texas. Extreme weather conditions limited the ability for these solar and wind facilities to generate and sell electricity into the Electric Reliability Council of Texas market. Lost revenues and higher than expected purchased power costs have negatively impacted the operating results of these generating units. The financial impact of the storm is expected to be material to the Commercial Renewables segment's 2021 operating results. In addition, Duke Energy has been named in multiple lawsuits arising out of this winter storm. For more information, see Notes 2 and 4 to the Condensed Consolidated Financial Statements, "Business Segments" and "Commitments and Contingencies," respectively.

COVID-19

Duke Energy continues to monitor the impacts of the COVID-19 pandemic on its results of operations, financial position and cash flows as a result of the economic slowdown caused by reduced operations of businesses and governmental agencies and the corresponding reduction in the demand for energy. Duke Energy has experienced improvement in energy sales, aging of receivables and operating results in recent periods and continues efforts to partially offset these impacts. Additionally, in light of learnings from COVID-19 regarding workforce deployment and technology capabilities, the company has reviewed the long-term real estate and future workforce strategy. The review has resulted in an initiative that will reduce physical workspace and includes reassessments of lease terms and lease modifications, termination penalties, as well as, asset impairments on property, plant and equipment and a change in workforce roles and responsibilities. For more information, see Notes 1 and 3 to the Condensed Consolidated Financial Statements, "Organization and Basis of Presentation" and "Regulatory Matters," respectively.

Activist Investor

On May 17, 2021, Elliott, who has indicated it holds an economic interest in outstanding Duke Energy common stock, publicly released a letter it had sent to the Board, which advocated for consideration of certain governance and strategic proposals. On May 17, 2021, management issued a response to Elliott. On July 19, 2021, Elliott publicly released a second letter to the Board and Duke Energy issued a response. Duke Energy is unable to predict the outcome of this matter.

Other Matters

See "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations," in the Duke Energy Registrants' Annual Reports on Form 10-K for the year ended December 31, 2020, for discussion of risks associated with the Tax Act.

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MD&A DUKE ENERGY

Results of Operations

Non-GAAP Measures

Management’s Discussion and Analysis includes financial information prepared in accordance with GAAP in the U.S., as well as certain non-GAAP financial measures such as adjusted earnings and adjusted EPS discussed below. Generally, a non-GAAP financial measure is a numerical measure of financial performance, financial position or cash flows that excludes (or includes) amounts that are included in (or excluded from) the most directly comparable measure calculated and presented in accordance with GAAP. Non-GAAP financial measures should be viewed as a supplement to, and not a substitute for, financial measures presented in accordance with GAAP. Non-GAAP measures presented may not be comparable to similarly titled measures used by other companies because other companies may not calculate the measures in the same manner.

Management evaluates financial performance in part based on non-GAAP financial measures, including adjusted earnings and adjusted EPS. Adjusted earnings and adjusted EPS represent income from continuing operations available to Duke Energy Corporation common stockholders in dollar and per share amounts, adjusted for the dollar and per share impact of special items. As discussed below, special items represent certain charges and credits, which management believes are not indicative of Duke Energy's ongoing performance. The most directly comparable GAAP measures for adjusted earnings and adjusted EPS are GAAP Reported Earnings (Loss) and GAAP Reported Earnings (Loss) Per Share, respectively.

Special items included in the periods presented below include the following, which management believes do not reflect ongoing costs:

•Workplace and workforce realignment represents costs attributable to business transformation, including long-term real estate strategy changes and workforce realignment.

•Regulatory Settlements represents an impairment charge related to the 2018 South Carolina rate cases, charges related to the CCR settlement and insurance proceeds distributed in accordance with that agreement and Duke Energy Carolinas and Duke Energy Progress partial settlements in the 2019 North Carolina rate cases.

•Gas Pipeline Investments represents costs related to the cancellation of the ACP pipeline and additional exit obligations.

•Severance represents the reversal of 2018 severance charges, which were deferred as a result of partial settlements in the Duke Energy Carolinas and the Duke Energy Progress 2019 North Carolina rate cases.

Three Months Ended September 30, 2021, as compared to September 30, 2020

GAAP reported EPS was $1.79 for the third quarter of 2021 compared to a $1.74 in the third quarter of 2020. In addition to the drivers below, GAAP reported EPS increased due to the cancellation of the ACP pipeline in the prior year and partial settlements in the 2019 North Carolina rate cases in the prior year. This was partially offset by an impairment charge related to the 2018 South Carolina rate cases and charges related to the CCR settlement and insurance proceeds distributed in accordance with that agreement.

As discussed above, management also evaluates financial performance based on adjusted EPS. Duke Energy’s third quarter 2021 adjusted EPS was $1.88 compared to $1.87 for the third quarter of 2020. The increase in adjusted EPS was primarily due to positive rate case contributions and higher volumes. This was partially offset by higher operation and maintenance expenses, higher income tax expense and share dilution from equity issuances.

The following table reconciles non-GAAP measures, including adjusted EPS, to their most directly comparable GAAP measures.

	Three Months Ended September 30,
	2021				2020
(in millions, except per share amounts)	Earnings		EPS		Earnings		EPS
GAAP Reported Earnings/GAAP Reported EPS	$	1,366	$	1.79	$	1,265	$	1.74
Adjustments:
Workplace and Workforce Realignment(a)	7		—		—		—
Regulatory Settlements(b)	64		0.09		27		0.04
Gas Pipeline Investments(c)	(2)		—		69		0.09
Adjusted Earnings/Adjusted EPS	$	1,435	$	1.88	$	1,361	$	1.87

(a)Net of tax benefit of $2 million.

(b)Net of tax benefit of $19 million and $8 million for the three months ended September 30, 2021, and 2020, respectively.

(c)Net of tax expense of $1 million and tax benefit of $21 million for the three months ended September 30, 2021, and 2020, respectively.

Nine Months Ended September 30, 2021, as compared to September 30, 2020

GAAP Reported EPS was $4.00 for the nine months ended September 30, 2021, compared to $1.85 for the nine months ended September 30, 2020. In addition to the drivers below, GAAP reported EPS increased due to the cancellation of the ACP pipeline in the prior year, partially offset by workplace and workforce realignment costs.

As discussed above, management also evaluates financial performance based on adjusted EPS. Duke Energy’s adjusted EPS was $4.30 for the nine months ended September 30, 2021, compared to $4.09 for the nine months ended September 30, 2020. The increase in adjusted EPS was primarily due to positive rate case contributions and higher volumes, partially offset by higher income tax expense and share dilution from equity issuances.

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The following table reconciles non-GAAP measures, including adjusted EPS, to their most directly comparable GAAP measures.

	Nine Months Ended September 30,
	2021				2020
(in millions, except per share amounts)	Earnings		EPS		Earnings		EPS
GAAP Reported Earnings/GAAP Reported EPS	$	3,070	$	4.00	$	1,347	$	1.85
Adjustments:
Workplace and Workforce Realignment(a)	142		0.19		—		—
Regulatory Settlements(b)	64		0.09		27		0.04
Gas Pipeline Investments(c)	15		0.02		1,695		2.30
Severance(d)	—		—		(75)		(0.10)
Adjusted Earnings/Adjusted EPS	$	3,291	$	4.30	$	2,994	$	4.09

(a)Net of tax benefit of $42 million.

(b)Net of tax benefit of $19 million and $8 million for the nine months ended September 30, 2021, and 2020, respectively.

(c)Net of tax benefit of $4 million and $395 million for the nine months ended September 30, 2021, and 2020, respectively.

(d)Net of tax expense of $23 million.

SEGMENT RESULTS

The remaining information presented in this discussion of results of operations is on a GAAP basis. Management evaluates segment performance based on segment income. Segment income is defined as income from continuing operations net of income attributable to noncontrolling interests and preferred stock dividends. Segment income includes intercompany revenues and expenses that are eliminated in the Condensed Consolidated Financial Statements.

Duke Energy's segment structure includes the following segments: Electric Utilities and Infrastructure, Gas Utilities and Infrastructure and Commercial Renewables. The remainder of Duke Energy’s operations is presented as Other. See Note 2 to the Condensed Consolidated Financial Statements, “Business Segments,” for additional information on Duke Energy’s segment structure.

Electric Utilities and Infrastructure

	Three Months Ended September 30,						Nine Months Ended September 30,
(in millions)	2021		2020		Variance		2021		2020		Variance
Operating Revenues	$	6,569	$	6,379	$	190	$	17,185	$	16,596	$	589
Operating Expenses
Fuel used in electric generation and purchased power	1,864		1,869		(5)		4,760		4,703		57
Operation, maintenance and other	1,363		1,326		37		3,907		3,891		16
Depreciation and amortization	1,084		1,053		31		3,154		3,023		131
Property and other taxes	330		286		44		949		885		64
Impairment of assets and other charges	202		20		182		203		23		180
Total operating expenses	4,843		4,554		289		12,973		12,525		448
Gains on Sales of Other Assets and Other, net	9		3		6		11		11		—
Operating Income	1,735		1,828		(93)		4,223		4,082		141
Other Income and Expenses, net	220		67		153		421		241		180
Interest Expense	365		308		57		1,066		991		75
Income Before Income Taxes	1,590		1,587		3		3,578		3,332		246
Income Tax Expense	160		206		(46)		393		493		(100)
Less: Income Attributable to Noncontrolling Interest	5		—		5		5		—		5
Segment Income	$	1,425	$	1,381	$	44	$	3,180	$	2,839	$	341
Duke Energy Carolinas GWh sales	25,033		23,726		1,307		67,357		64,045		3,312
Duke Energy Progress GWh sales	19,219		19,035		184		51,555		49,512		2,043
Duke Energy Florida GWh sales	12,983		12,973		10		32,731		32,390		341
Duke Energy Ohio GWh sales	6,844		6,678		166		18,586		17,763		823
Duke Energy Indiana GWh sales	8,788		8,463		325		23,880		22,842		1,038
Total Electric Utilities and Infrastructure GWh sales	72,867		70,875		1,992		194,109		186,552		7,557
Net proportional MW capacity in operation							49,749		50,371		(622)

96

MD&A SEGMENT RESULTS — ELECTRIC UTILITIES AND INFRASTRUCTURE

Three Months Ended September 30, 2021, as compared to September 30, 2020

Electric Utilities and Infrastructure’s higher segment income is due to higher revenues from rate cases in various jurisdictions, weather-normal sales volumes, and coal ash insurance litigation proceeds partially offset by an impairment charge related to the South Carolina rate cases and higher operating expenses. The following is a detailed discussion of the variance drivers by line item.

Operating Revenues. The variance was driven primarily by:

•a $144 million increase in retail base rate pricing due to general rate cases in North Carolina and Indiana net of rider impacts as well as multiyear rate adjustments in Florida; and

•a $114 million increase in weather-normal retail sales volumes.

Partially offset by

•a $48 million decrease in storm revenues at Duke Energy Florida due to full recovery of Hurricane Dorian costs in the prior year; and

•a $17 million decrease in retail sales due to less favorable weather in the current year.

Operating Expenses. The variance was driven primarily by:

•a $182 million increase in impairment of assets and other charges primarily due to the 2018 South Carolina rate case settlements at Duke Energy Carolinas and Duke Energy Progress, partially offset by a prior year impairment of Duke Energy Carolina's Clemson assets;

•a $44 million increase in property and other taxes primarily due to higher property taxes at Duke Energy Carolinas and Duke Energy Ohio and a prior year sales and use tax refund at Duke Energy Carolinas;

•a $37 million increase in operation, maintenance and other primarily driven by higher employee-related costs, partially offset by lower storm and outage costs; and

•a $31 million increase in depreciation and amortization primarily due to resolution of rate cases and higher plant in service, partially offset by lower depreciation related to the extension of the lives of nuclear facilities.

Other Income and Expense, net. The increase is primarily due to coal ash insurance litigation proceeds at Duke Energy Carolinas and Duke Energy Progress and lower non-service pension costs.

Interest Expense. The variance was primarily due to lower debt return on coal ash at Duke Energy Carolinas, Duke Energy Progress and Duke Energy Indiana.

Income Tax Expense. The decrease in tax expense was primarily due to an increase in the amortization of excess deferred taxes. The ETRs for the three months ended September 30, 2021, and 2020, were 10.1% and 13.0%, respectively. The decrease in the ETR was primarily due to an increase in the amortization of excess deferred taxes.

Nine Months Ended September 30, 2021, as compared to September 30, 2020

Electric Utilities and Infrastructure’s variance is due to higher revenues from rate cases in various jurisdictions, higher retail sales volumes, and coal ash insurance litigation proceeds, partially offset by an impairment charge related to the South Carolina rate cases, higher depreciation and amortization and interest expense. The following is a detailed discussion of the variance drivers by line item.

Operating Revenues. The variance was driven primarily by:

•a $297 million increase in retail base rate pricing due to general rate cases in Indiana and North Carolina net of rider impacts as well as multiyear settlement rate adjustments in Florida;

•a $188 million increase in weather-normal retail sales volumes;

•an $86 million increase in retail sales, net of fuel revenues, due to favorable weather;

•a $61 million increase in fuel revenues primarily driven by higher sales volumes; and

•a $21 million increase in wholesale revenues primarily due to higher rates at Duke Energy Indiana and higher volumes at Duke Energy Progress, partially offset by a restructured capacity contract at Duke Energy Florida.

Partially offset by:

•a $103 million decrease in storm revenues due to full recovery of Hurricane Dorian costs in the prior year.

97

MD&A SEGMENT RESULTS — ELECTRIC UTILITIES AND INFRASTRUCTURE

Operating Expenses. The variance was driven primarily by:

•a $180 million increase in impairment of assets and other charges primarily due to the 2018 South Carolina rate case settlements at Duke Energy Carolinas and Duke Energy Progress, partially offset by a prior year impairment of Duke Energy Carolinas' Clemson assets;

•a $131 million increase in depreciation and amortization primarily due to resolution of rate cases and higher plant in service, partially offset by lower depreciation related to the extension of the lives of nuclear facilities;

•a $64 million increase in property and other taxes primarily due to higher property taxes at Duke Energy Carolinas and Duke Energy Ohio, and a prior year sales and use tax refund at Duke Energy Carolinas;

•a $57 million increase in fuel used in electric generation and purchased power primarily due to higher sales volumes; and

•a $16 million increase in operations, maintenance and other driven by higher employee-related expenses, partially offset by decreased storm amortization at Duke Energy Florida and lower COVID-19 costs.

Other Income and Expenses, net. The increase is primarily due to coal ash insurance litigation proceeds at Duke Energy Carolinas and Duke Energy Progress and lower non-service pension costs.

Interest Expense. The variance was primarily due to lower debt return on coal ash at Duke Energy Carolinas, Duke Energy Progress and Duke Energy Indiana.

Income Tax Expense. The decrease in tax expense was primarily due to an increase in the amortization of excess deferred taxes, partially offset by an increase in pretax income. The ETRs for the nine months ended September 30, 2021, and 2020, were 11.0% and 14.8%, respectively. The decrease in the ETR was primarily due to an increase in the amortization of excess deferred taxes.

Gas Utilities and Infrastructure

	Three Months Ended September 30,						Nine Months Ended September 30,
(in millions)	2021		2020		Variance		2021		2020		Variance
Operating Revenues	$	289	$	241	$	48	$	1,391	$	1,194	$	197
Operating Expenses
Cost of natural gas	75		41		34		430		300		130
Operation, maintenance and other	102		103		(1)		302		312		(10)
Depreciation and amortization	74		65		9		216		193		23
Property and other taxes	30		26		4		92		82		10
Impairment of assets and other charges	—		7		(7)		—		7		(7)
Total operating expenses	281		242		39		1,040		894		146
Operating Income (Loss)	8		(1)		9		351		300		51
Other Income and Expenses
Equity in earnings (losses) of unconsolidated affiliates	10		(71)		81		2		(2,004)		2,006
Other income and expenses, net	15		16		(1)		50		42		8
Total other income and expenses	25		(55)		80		52		(1,962)		2,014
Interest Expense	37		35		2		105		103		2
(Loss) Income Before Income Taxes	(4)		(91)		87		298		(1,765)		2,063
Income Tax (Benefit) Expense	(1)		(18)		17		39		(365)		404
Segment (Loss) Income	$	(3)	$	(73)	$	70	$	259	$	(1,400)	$	1,659
Piedmont LDC throughput (dekatherms)	134,549,588		115,549,371		19,000,217		390,210,785		360,861,306		29,349,479
Duke Energy Midwest LDC throughput (Mcf)	10,268,918		9,678,342		590,576		62,220,827		58,570,583		3,650,244

Three Months Ended September 30, 2021, as compared to September 30, 2020

Gas Utilities and Infrastructure’s results were impacted primarily by the cancellation of the ACP pipeline in the prior year. The following is a detailed discussion of the variance drivers by line item.

Operating Revenues. The variance was driven primarily by:

•a $34 million increase due to higher natural gas costs passed through to customers, higher volumes, and higher off-system sales natural gas costs; and

•a $12 million increase due to growth in base rates and riders at Piedmont and growth in riders in the Midwest.

98

MD&A SEGMENT RESULTS — GAS UTILITIES AND INFRASTRUCTURE

Operating Expenses. The variance was driven primarily by:

•a $34 million increase in cost of natural gas due to higher natural gas prices, higher volumes, and increased off-system sales natural gas costs; and

•a $9 million increase in depreciation due to additional plant in service.

Equity in earnings (losses) of unconsolidated affiliates. The variance was primarily driven by the cancellation of the ACP pipeline in the prior year.

Income Tax Benefit. The decrease in tax benefit was primarily due to a decrease in pretax losses. The ETRs for the three months ended September 30, 2021, and 2020, were 25.0% and 19.8%, respectively. The increase in the ETR was primarily due to certain favorable tax credits.

Nine Months Ended September 30, 2021, as compared to September 30, 2020

Gas Utilities and Infrastructure’s results were impacted primarily by the cancellation of the ACP pipeline in the prior year and margin growth. The following is a detailed discussion of the variance drivers by line item.

Operating Revenues. The variance was driven primarily by:

•a $130 million increase due to higher natural gas costs passed through to customers, higher volumes, and increased off-system sales natural gas costs;

•a $15 million increase due to Tennessee base rate case increases;

•an $11 million increase due to North Carolina IMR; and

•a $10 million increase due to revenue from the Capital Expenditure Program (CEP) rider related to 2019 and 2020 activity.

Operating Expenses. The variance was driven primarily by:

•a $130 million increase in cost of natural gas due to higher natural gas prices, higher volumes, and increased off-system sales natural gas costs; and

•a $23 million increase in depreciation due to additional plant in service.

Equity in earnings (losses) of unconsolidated affiliates. The variance was driven primarily by the cancellation of the ACP pipeline in the prior year.

Income Tax Expense. The increase in tax expense was primarily due to the cancellation of the ACP pipeline project recorded in the prior year. The ETRs for the nine months ended September 30, 2021, and 2020, were 13.1% and 20.7%, respectively. The decrease in the ETR was primarily due to the cancellation of the ACP pipeline project recorded in the prior year.

Commercial Renewables

	Three Months Ended September 30,						Nine Months Ended September 30,
(in millions)	2021		2020		Variance		2021		2020		Variance
Operating Revenues	$	117	$	126	$	(9)	$	355	$	378	$	(23)
Operating Expenses
Operation, maintenance and other	90		72		18		240		204		36
Depreciation and amortization	58		52		6		167		148		19
Property and other taxes	10		8		2		28		24		4
Impairment of assets and other charges	—		—		—		—		6		(6)
Total operating expenses	158		132		26		435		382		53
Operating Loss	(41)		(6)		(35)		(80)		(4)		(76)
Other Income and Expenses, net	(2)		(1)		(1)		(24)		—		(24)
Interest Expense	20		18		2		53		49		4
Loss Before Income Taxes	(63)		(25)		(38)		(157)		(53)		(104)
Income Tax Benefit	(6)		(15)		9		(56)		(52)		(4)
Add: Loss Attributable to Noncontrolling Interests	135		70		65		253		208		45
Segment Income	$	78	$	60	$	18	$	152	$	207	$	(55)
Renewable plant production, GWh	2,567		2,563		4		7,942		7,660		282
Net proportional MW capacity in operation(a)							4,630		3,984		646

(a)Certain projects are included in tax equity structures where investors have differing interests in the project's economic attributes. One hundred percent of the tax equity project's capacity is included in the table above.

99

MD&A SEGMENT RESULTS — COMMERCIAL RENEWABLES

Three Months Ended September 30, 2021, as compared to September 30, 2020

Commercial Renewables' results were favorable to prior year primarily driven by the growth of new project investments. Since the prior year period, Commercial Renewables has placed in service approximately 650 MW.

Operating Revenues. The variance was primarily driven by an $8 million decrease due to lower wind resource and operating downtime.

Operating Expenses. The variance was primarily driven by a $12 million increase in operating expenses, depreciation expense and property tax expense associated with the growth of new project investments placed in service, $8 million increase for higher engineering and construction costs within the distributed energy portfolio and $3 million increase attributed to maintenance at several facilities.

Income Tax Benefit. The decrease in the tax benefit was primarily driven by an increase in taxes associated with tax equity investments and a decrease in production tax credits generated partially offset by an increase in pretax losses.

Loss Attributable to Noncontrolling Interests. The increase was primarily driven by the growth of new wind and solar project investments financed with tax equity.

Nine Months Ended September 30, 2021, as compared to September 30, 2020

Commercial Renewables' results were unfavorable to prior year primarily driven by the impacts from Texas Storm Uri, which resulted in a $35 million pretax loss, as well as unfavorable wind resource and fewer projects being placed in service in the current year.

Operating Revenues. The variance was primarily driven by a $20 million decrease due to lower wind resource and operating downtime and a $15 million decrease for lower market prices in the current year impacting the wind portfolio. This was partially offset by an $8 million increase for market sales in excess of market purchases during Texas Storm Uri and a $4 million increase due to growth of new projects.

Operating Expenses. The increase was primarily due to $33 million for higher operating expenses, depreciation expense and property tax expense as a result of the growth in new projects placed in service since prior year, $11 million increase for higher operating expenses attributed to maintenance at several wind and solar facilities, an $11 million increase for higher engineering and construction costs within the distributed energy portfolio and a $2 million increase associated with Texas Storm Uri. This was partially offset by a $6 million decrease related to an impairment charge in the prior year for a non-contracted wind project.

Other Income and Expenses, net. The variance was primarily driven by a $29 million loss in equity earnings due to the impacts of Texas Storm Uri, partially offset by $4 million in equity earnings from the wind and distributed asset portfolios.

Income Tax Benefit. The increase in the tax benefit was primarily driven by an increase in pretax losses partially offset by an increase in taxes associated with tax equity investments and a decrease in production tax credits generated.

Loss Attributable to Noncontrolling Interests. The variance was primarily driven by a $57 million net increase from the growth of new project investments financed with tax equity, partially offset by a $12 million loss resulting from Texas Storm Uri.

Other

	Three Months Ended September 30,						Nine Months Ended September 30,
(in millions)	2021		2020		Variance		2021		2020		Variance
Operating Revenues	$	28	$	24	$	4	$	81	$	73	$	8
Operating Expenses	46		37		9		282		(15)		297
Losses on Sales of Other Assets and Other, net	(1)		—		(1)		(1)		—		(1)
Operating (Loss) Income	(19)		(13)		(6)		(202)		88		(290)
Other Income and Expenses, net	25		43		(18)		78		55		23
Interest Expense	163		160		3		470		498		(28)
Loss Before Income Taxes	(157)		(130)		(27)		(594)		(355)		(239)
Income Tax Benefit	(63)		(66)		3		(166)		(149)		(17)
Less: Income Attributable to Noncontrolling Interests	1		—		1		1		—		1
Less: Preferred Dividends	39		39		—		92		93		(1)
Net Loss	$	(134)	$	(103)	$	(31)	$	(521)	$	(299)	$	(222)

Three Months Ended September 30, 2021, as compared to September 30, 2020

The higher net loss was driven by interest income related to a tax refund recorded in the prior year, impairments to optimize the company’s real estate portfolio and reduce office space as parts of the business move to a hybrid and remote workforce strategy and a lower income tax benefit due to higher tax optimization achieved in the prior year partially offset by higher pretax loss.

Operating Expenses. The increase was primarily driven by asset impairments to optimize the company's real estate portfolio and reduce office space as parts of the business move to a hybrid and remote workforce strategy.

Other Income and Expenses, net. The variance was primarily due to higher interest income in the prior year related to a tax refund of AMT credit carryforwards.

Interest Expense. The variance was primarily due to higher outstanding long-term debt.

100

MD&A SEGMENT RESULTS - OTHER

Nine Months Ended September 30, 2021, as compared to September 30, 2020

The higher net loss was driven by asset impairments to optimize the company's real estate portfolio and reduce office space as parts of the business move to a hybrid and remote workforce strategy as well as a reversal of severance costs in the prior year.

Operating Expenses. The increase was primarily due to asset impairments to optimize the company's real estate portfolio and reduce office space as parts of the business move to a hybrid and remote workforce strategy as well as a reversal of severance costs in the prior year.

Other Income and Expenses, net. The variance was primarily due to higher equity earnings from the NMC investment and market returns on investments that fund certain employee benefit obligations, partially offset by lower interest income in the prior year related to a tax refund of AMT credit carryforwards.

Interest Expense. The variance was primarily due to lower interest rates.

Income Tax Benefit. The increase in the tax benefit was primarily driven by an increase in pretax losses, partially offset by lower state tax expense in the prior year. The ETRs for the nine months ended September 30, 2021, and 2020, were 27.9% and 42.0%, respectively. The decrease in the ETR was primarily due to lower state tax expense in the prior year.

DUKE ENERGY CAROLINAS

Results of Operations

	Nine Months Ended September 30,
(in millions)	2021		2020		Variance
Operating Revenues	$	5,430	$	5,416	$	14
Operating Expenses
Fuel used in electric generation and purchased power	1,218		1,326		(108)
Operation, maintenance and other	1,347		1,218		129
Depreciation and amortization	1,088		1,090		(2)
Property and other taxes	248		213		35
Impairment of assets and other charges	238		22		216
Total operating expenses	4,139		3,869		270
Gains on Sales of Other Assets and Other, net	1		1		—
Operating Income	1,292		1,548		(256)
Other Income and Expenses, net	218		128		90
Interest Expense	400		370		30
Income Before Income Taxes	1,110		1,306		(196)
Income Tax Expense	40		178		(138)
Net Income	$	1,070	$	1,128	$	(58)

The following table shows the percent changes in GWh sales and average number of customers. The percentages for retail customer classes represent billed sales only. Total sales includes billed and unbilled retail sales and wholesale sales to incorporated municipalities, public and private utilities and power marketers. Amounts are not weather-normalized.

Increase (Decrease) over prior year	2021
Residential sales	4.9	%
General service sales	2.0	%
Industrial sales	5.8	%
Wholesale power sales	6.0	%
Joint dispatch sales	23.0	%
Total sales	5.2	%
Average number of customers	2.4	%

Nine Months Ended September 30, 2021, as compared to September 30, 2020

Operating Revenues. The variance was driven primarily by:

•an $88 million increase in weather-normal retail sales volumes;

•a $57 million increase in retail sales due to more favorable weather; and

•a $22 million increase due to higher pricing from the North Carolina retail rate case, net of a return of EDIT to customers.

Partially offset by:

•a $115 million decrease in fuel revenues due to lower prices, partially offset by higher retail sales volumes; and

•a $40 million decrease in rider revenues primarily due to energy efficiency programs.

101

MD&A DUKE ENERGY CAROLINAS

Operating Expenses. The variance was driven primarily by:

•a $216 million increase in impairment of assets and other charges due to the 2018 South Carolina rate case settlement and optimization of the company's real estate portfolio and reduction of office space as parts of the business move to a hybrid and remote workforce strategy, partially offset by a prior year Clemson University Combined Heat and Power Plant impairment;

•a $129 million increase in operation, maintenance and other expense primarily due to higher employee-related expenses and a severance cost adjustment in the prior year related to the 2019 North Carolina retail rate case, and higher costs associated with the implementation of Customer Connect; and

•a $35 million increase in property and other taxes primarily due to property tax valuation adjustments and a prior year sales and use tax refund.

Partially offset by:

•a $108 million decrease in fuel used in electric generation and purchased power primarily associated with the recovery of fuel expenses, partially offset by higher natural gas prices and changes in the generation mix.

Other Income and Expense, net. The variance was primarily due to coal ash insurance proceeds and lower non-service pension costs.

Interest Expense. The variance was driven by amortization of carrying costs related to excess deferred taxes, and lower debt return on coal ash projects.

Income Tax Expense. The decrease in tax expense was primarily due to an increase in the amortization of excess deferred taxes and a decrease in pretax income.

PROGRESS ENERGY

Results of Operations

	Nine Months Ended September 30,
(in millions)	2021		2020		Variance
Operating Revenues	$	8,417	$	8,117	$	300
Operating Expenses
Fuel used in electric generation and purchased power	2,702		2,628		74
Operation, maintenance and other	1,863		1,789		74
Depreciation and amortization	1,430		1,356		74
Property and other taxes	419		419		—
Impairment of assets and other charges	79		1		78
Total operating expenses	6,493		6,193		300
Gains on Sales of Other Assets and Other, net	9		9		—
Operating Income	1,933		1,933		—
Other Income and Expenses, net	167		89		78
Interest Expense	592		599		(7)
Income Before Income Taxes	1,508		1,423		85
Income Tax Expense	174		190		(16)
Net Income	1,334		1,233		101
Less: Net Income Attributable to Noncontrolling Interests	1		1		—
Net Income Attributable to Parent	$	1,333	$	1,232	$	101

Nine Months Ended September 30, 2021, as compared to September 30, 2020

Operating Revenues. The variance was driven primarily by:

•a $146 million increase in fuel cost recovery driven by higher fuel prices, higher volumes in the current year and accelerated recovery of retired Crystal River coal units;

•a $136 million increase in retail pricing due to the North Carolina rate case and base rate adjustments at Duke Energy Florida related to annual increases from the 2017 Settlement Agreement and the solar base rate adjustment;

•a $73 million increase in weather-normal retail sales volumes;

•a $32 million increase in other revenues at Duke Energy Florida primarily due to higher transmission revenues and higher customer charges that were waived due to COVID-19 in the prior year; and

•a $19 million increase in rider revenues at Duke Energy Florida primarily due to increased retail sales volumes.

102

MD&A PROGRESS ENERGY

Partially offset by:

•a $103 million decrease in storm revenues at Duke Energy Florida due to full recovery of Hurricane Dorian costs in the prior year.

Operating Expenses. The variance was driven primarily by:

•a $78 million increase in impairment of assets and other charges primarily due to the 2018 South Carolina rate case settlement at Duke Energy Progress and optimization of the company's real estate portfolio and reduction of office space as parts of the business move to a hybrid and remote workforce strategy;

•a $74 million increase in fuel used in electric generation and purchased power primarily due to higher demand, changes in generation mix and recognition of RECs used for compliance at Duke Energy Progress, and outside fuel purchases during a major plant outage;

•a $74 million increase in operation, maintenance and other expense driven by a prior year severance cost adjustment related to the 2019 North Carolina retail rate case, outage costs and other employee-related costs, partially offset by reduced storm amortization at Duke Energy Florida; and

•a $74 million increase in depreciation and amortization primarily due to accelerated depreciation of retired Crystal River coal units and an increase in plant base at Duke Energy Florida, partially offset by the extension of the lives at nuclear facilities at Duke Energy Progress.

Other Income and Expenses, net. The increase is primarily due to coal ash insurance litigation proceeds at Duke Energy Progress, lower non-service pension costs and unrealized gains on the nuclear decommissioning trust fund at Duke Energy Florida.

Income Tax Expense. The decrease in tax expense was primarily due to an increase in the amortization of excess deferred taxes, partially offset by an increase in pretax income.

DUKE ENERGY PROGRESS

Results of Operations

	Nine Months Ended September 30,
(in millions)	2021		2020		Variance
Operating Revenues	$	4,417	$	4,207	$	210
Operating Expenses
Fuel used in electric generation and purchased power	1,368		1,337		31
Operation, maintenance and other	1,092		970		122
Depreciation and amortization	811		833		(22)
Property and other taxes	129		129		—
Impairment of assets and other charges	60		5		55
Total operating expenses	3,460		3,274		186
Gains on Sales of Other Assets and Other, net	8		8		—
Operating Income	965		941		24
Other Income and Expenses, net	111		52		59
Interest Expense	226		203		23
Income Before Income Taxes	850		790		60
Income Tax Expense	50		79		(29)
Net Income	$	800	$	711	$	89

The following table shows the percent changes in GWh sales and average number of customers. The percentages for retail customer classes represent billed sales only. Total sales includes billed and unbilled retail sales and wholesale sales to incorporated municipalities, public and private utilities and power marketers. Amounts are not weather-normalized.

Increase (Decrease) over prior period	2021
Residential sales	6.5	%
General service sales	3.9	%
Industrial sales	2.7	%
Wholesale power sales	5.2	%
Joint dispatch sales	(2.6)	%
Total sales	4.1	%
Average number of customers	0.4	%

103

MD&A DUKE ENERGY PROGRESS

Nine Months Ended September 30, 2021, as compared to September 30, 2020

Operating Revenues. The variance was driven primarily by:

•a $72 million increase due to higher pricing from the North Carolina retail rate case, net of a return of EDIT to customers;

•a $54 million increase in weather-normal retail sales volumes in the current year;

•a $46 million increase in retail sales due to more favorable weather;

•a $24 million increase in fuel cost recovery driven by higher fuel prices and volumes in the current year; and

•a $15 million increase in wholesale revenues due to higher capacity volumes, partially offset by lower recovery of coal ash costs.

Operating Expenses. The variance was driven primarily by:

•a $122 million increase in operation, maintenance and other expense primarily due to higher employee-related costs and a severance cost adjustment in the prior year related to the 2019 North Carolina retail rate case, increased outage costs and energy efficiency program costs;

•a $55 million increase in impairment of assets and other charges primarily due to the 2018 South Carolina rate case settlement at Duke Energy Progress and optimization of the company's real estate portfolio and reduction of office space as parts of the business move to a hybrid and remote workforce strategy; and

•a $31 million increase in fuel used in electric generation and purchased power primarily due to higher demand and changes in generation mix as well as recognition of RECs used for compliance.

Partially offset by:

•a $22 million decrease in depreciation and amortization expense, primarily driven by the extension of the lives of nuclear facilities.

Other Income and Expense, net. The increase is primarily due to coal ash insurance litigation proceeds and lower non-service pension costs.

Interest Expense. The variance was driven primarily by lower debt return on coal ash projects.

Income Tax Expense. The decrease in tax expense was primarily due to an increase in the amortization of excess deferred taxes, partially offset by an increase in pretax income.

DUKE ENERGY FLORIDA

Results of Operations

	Nine Months Ended September 30,
(in millions)	2021		2020		Variance
Operating Revenues	$	3,987	$	3,897	$	90
Operating Expenses
Fuel used in electric generation and purchased power	1,335		1,291		44
Operation, maintenance and other	760		806		(46)
Depreciation and amortization	619		523		96
Property and other taxes	290		290		—
Impairment of assets and other charges	19		(4)		23
Total operating expenses	3,023		2,906		117
Gains on Sales of Other Assets and Other, net	1		—		1
Operating Income	965		991		(26)
Other Income and Expenses, net	54		36		18
Interest Expense	239		245		(6)
Income Before Income Taxes	780		782		(2)
Income Tax Expense	149		159		(10)
Net Income	$	631	$	623	$	8

104

MD&A DUKE ENERGY FLORIDA

The following table shows the percent changes in GWh sales and average number of customers. The percentages for retail customer classes represent billed sales only. Wholesale power sales include both billed and unbilled sales. Total sales includes billed and unbilled retail sales and wholesale sales to incorporated municipalities, public and private utilities and power marketers. Amounts are not weather-normalized.

Increase (Decrease) over prior period	2021
Residential sales	(0.5)	%
General service sales	3.1	%
Industrial sales	8.1	%
Wholesale and other	20.1	%
Total sales	1.1	%
Average number of customers	1.9	%

Nine Months Ended September 30, 2021, as compared to September 30, 2020

Operating Revenues. The variance was driven primarily by:

•a $122 million increase in fuel and capacity revenues primarily due to higher retail sales volumes and accelerated recovery of the retired coal units Crystal River 1 and 2;

•a $64 million increase in retail pricing due to base rate adjustments related to annual increases from the 2017 Settlement Agreement and the solar base rate adjustment;

•a $32 million increase in other revenues primarily due to lower revenues in the prior year due to the moratorium on customer late payments and service charges in response to the COVID-19 pandemic, lower outdoor lighting equipment rentals in the prior year, and higher transmission revenues due to prior year customer settlement and the increased network billing rates;

•a $19 million increase in rider revenues primarily due to increased volumes; and

•a $16 million increase in weather-normal retail sales volumes.

Partially offset by:

•a $103 million decrease in storm revenues due to full recovery of Hurricane Dorian costs in the prior year;

•a $37 million decrease in retail sales, net of fuel revenues, due to unfavorable weather in the current year; and

•an $18 million decrease in wholesale power revenues, net of fuel, primarily due to a restructured capacity contract.

Operating Expenses. The variance was driven primarily by:

•a $96 million increase in depreciation and amortization primarily due to accelerated depreciation of retired coal units Crystal River 1 and 2 and an increase in plant base;

•a $44 million increase in fuel used in electric generation and purchased power primarily due to higher natural gas prices, and outside fuel purchases during a major plant outage at the Hines facility; and

•a $23 million increase in impairment of assets and other charges to optimize the company's real estate portfolio and reduce office space as parts of the business move to a hybrid and remote workforce strategy.

Partially offset by:

•a $46 million decrease in operation, maintenance and other expense primarily due to decreased storm amortization costs, partially offset by outage maintenance costs at Hines.

Other Income and Expense, net. The increase is primarily due to lower non-service pension costs and gains on the nuclear decommissioning trust fund.

Income Tax Expense. The decrease in tax expense was primarily due to unfavorable tax adjustments in the prior year.

105

MD&A DUKE ENERGY OHIO

DUKE ENERGY OHIO

Results of Operations

	Nine Months Ended September 30,
(in millions)	2021		2020		Variance
Operating Revenues
Regulated electric	$	1,119	$	1,070	$	49
Regulated natural gas	375		324		51
Total operating revenues	1,494		1,394		100
Operating Expenses
Fuel used in electric generation and purchased power	294		258		36
Cost of natural gas	76		46		30
Operation, maintenance and other	335		333		2
Depreciation and amortization	228		208		20
Property and other taxes	266		244		22
Impairment of assets and other charges	5		—		5
Total operating expenses	1,204		1,089		115
Operating Income	290		305		(15)
Other Income and Expenses, net	14		11		3
Interest Expense	82		75		7
Income Before Income Taxes	222		241		(19)
Income Tax Expense	34		40		(6)
Net Income	$	188	$	201	$	(13)

The following table shows the percent changes in GWh sales of electricity, dekatherms of natural gas delivered and average number of electric and natural gas customers. The percentages for retail customer classes represent billed sales only. Total sales includes billed and unbilled retail sales and wholesale sales to incorporated municipalities, public and private utilities and power marketers. Amounts are not weather-normalized.

	Electric		Natural Gas
Increase (Decrease) over prior year	2021		2021
Residential sales	2.6	%	6.8	%
General service sales	3.8	%	9.8	%
Industrial sales	5.5	%	4.2	%
Wholesale electric power sales	104.7	%	n/a
Other natural gas sales	n/a		2.5	%
Total sales	4.6	%	6.2	%
Average number of customers	0.5	%	0.8	%

Nine Months Ended September 30, 2021, as compared to September 30, 2020

Operating Revenues. The variance was driven primarily by:

•a $31 million increase in fuel related revenues primarily due to higher natural gas prices and increased volumes;

•a $27 million increase in revenues related to OVEC collections and OVEC sales into PJM;

•a $16 million increase in PJM transmission revenues as a result of increased capital spend;

•an $11 million increase in retail pricing primarily due to the Duke Energy Kentucky general rate case; and

•a $6 million increase in revenues due to favorable weather.

Operating Expenses. The variance was driven primarily by:

•a $66 million increase in fuel expense primarily driven by higher retail prices and increased volumes for natural gas and purchased power;

•a $22 million increase in property and other taxes primarily due to increased plant in service, higher kilowatt and natural gas distribution taxes due to increased usage and a lower Network Integration Transmission Service tax deferral;

•a $20 million increase in depreciation and amortization primarily driven by an increase in distribution plant in service; and

•a $5 million increase in impairment of assets and other charges to optimize the company's real estate portfolio and reduce office space as parts of the business moves to a hybrid and remote workforce strategy.

Income Tax Expense. The decrease in tax expense was primarily due to a decrease in pretax income.

106

MD&A DUKE ENERGY INDIANA

DUKE ENERGY INDIANA

Results of Operations

	Nine Months Ended September 30,
(in millions)	2021		2020		Variance
Operating Revenues	$	2,366	$	2,070	$	296
Operating Expenses
Fuel used in electric generation and purchased power	710		577		133
Operation, maintenance and other	543		564		(21)
Depreciation and amortization	458		415		43
Property and other taxes	57		57		—
Impairment of assets and other charges	8		—		8
Total operating expenses	1,776		1,613		163
Operating Income	590		457		133
Other Income and Expenses, net	31		28		3
Interest Expense	148		114		34
Income Before Income Taxes	473		371		102
Income Tax Expense	77		72		5
Net Income	$	396	$	299	$	97

The following table shows the percent changes in GWh sales and average number of customers. The percentages for retail customer classes represent billed sales only. Total sales includes billed and unbilled retail sales and wholesale sales to incorporated municipalities, public and private utilities and power marketers. Amounts are not weather-normalized.

Increase (Decrease) over prior year	2021
Residential sales	3.0	%
General service sales	4.6	%
Industrial sales	5.5	%
Wholesale power sales	7.8	%
Total sales	4.5	%
Average number of customers	1.0	%

Nine Months Ended September 30, 2021, as compared to September 30, 2020

Operating Revenues. The variance was driven primarily by:

•a $128 million increase primarily due to higher base rate pricing from the Indiana retail rate case, net of lower rider revenues;

•a $109 million increase in fuel revenues primarily due to higher fuel cost recovery driven by customer demand and fuel prices;

•a $29 million increase in weather-normal retail sales volumes driven by higher nonresidential customer demand; and

•a $24 million increase in wholesale revenues primarily related to the true up of wholesale transmission revenues and higher rates in the current year.

Operating Expenses. The variance was driven primarily by:

•a $133 million increase in fuel used in electric generation and purchased power expense primarily due to higher purchased power expense, higher coal and natural gas costs and higher amortization of deferred fuel costs;

•a $43 million increase in depreciation and amortization primarily due to a change in depreciation rates from the Indiana retail rate case, amortization of deferred coal ash pond ARO and additional plant in service; and

•an $8 million increase in impairment of assets and other charges to optimize the company’s real estate portfolio and reduce office space as parts of the business move to a hybrid workforce strategy.

Partially offset by:

•a $21 million decrease in operation, maintenance and other primarily due to major outage costs incurred in the prior year and outage delays in the current year.

Interest Expense. The variance is primarily due to higher post-in-service carrying costs interest resulting from the Indiana retail rate case and higher prior year coal ash spend debt returns on the Indiana Department of Environmental Management's approved ash basin closure projects.

107

MD&A DUKE ENERGY INDIANA

Income Tax Expense. The increase in tax expense was primarily due to an increase in pretax income partially offset by an increase in the amortization of excess deferred taxes.

PIEDMONT

Results of Operations

	Nine Months Ended September 30,
(in millions)	2021		2020		Variance
Operating Revenues	$	1,016	$	871	$	145
Operating Expenses
Cost of natural gas	354		254		100
Operation, maintenance and other	231		234		(3)
Depreciation and amortization	150		133		17
Property and other taxes	44		37		7
Impairment of assets and other charges	9		7		2
Total operating expenses	788		665		123
Operating Income	228		206		22
Other Income and Expenses, net	51		44		7
Interest Expense	88		89		(1)
Income Before Income Taxes	191		161		30
Income Tax Expense	16		6		10
Net Income	$	175	$	155	$	20

The following table shows the percent changes in dekatherms delivered and average number of customers. The percentages for all throughput deliveries represent billed and unbilled sales. Amounts are not weather-normalized.

Increase (Decrease) over prior year	2021
Residential deliveries	16.0	%
Commercial deliveries	14.3	%
Industrial deliveries	5.4	%
Power generation deliveries	6.7	%
For resale	20.0	%
Total throughput deliveries	8.1	%
Secondary market volumes	(0.9)	%
Average number of customers	2.0	%

The margin decoupling mechanism adjusts for variations in residential and commercial use per customer, including those due to weather and conservation. The weather normalization adjustment mechanisms mostly offset the impact of weather on bills rendered, but do not ensure full recovery of approved margin during periods when winter weather is significantly warmer or colder than normal.

Nine Months Ended September 30, 2021, as compared to September 30, 2020

Operating Revenues. The variance was driven primarily by:

•a $100 million increase due to higher natural gas costs passed through to customers and increased off-system sales natural gas costs;

•a $15 million increase due to Tennessee base rate case increases; and

•an $11 million increase due to North Carolina IMR.

Operating Expenses. The variance was driven primarily by:

•a $100 million increase due to higher natural gas costs passed through to customers and increased off-system sales natural gas costs;

•a $17 million increase in depreciation expense due to additional plant in service and software projects in service; and

•a $7 million increase in property and other taxes due to higher current year property taxes in North Carolina and South Carolina.

Other Income and Expense, net. The variance is primarily driven by favorable AFUDC equity and intercompany interest income.

Income Tax Expense. The increase in tax expense was primarily due to an increase in pretax income.

108

MD&A LIQUIDITY AND CAPITAL RESOURCES

LIQUIDITY AND CAPITAL RESOURCES

Sources and Uses of Cash

Duke Energy relies primarily upon cash flows from operations, debt and equity issuances and its existing cash and cash equivalents to fund its liquidity and capital requirements. Duke Energy’s capital requirements arise primarily from capital and investment expenditures, repaying long-term debt and paying dividends to shareholders. Duke Energy’s Annual Report on Form 10-K for the year ended December 31, 2020, included a summary and detailed discussion of projected primary sources and uses of cash for 2021 to 2023.

In January 2021, Duke Energy entered into a definitive agreement with an affiliate of GIC, for GIC to make an indirect minority interest investment of 19.9% in Duke Energy Indiana. The investment will be completed following two closings for an aggregate purchase price of approximately $2 billion. The first closing occurred on September 8, 2021, and Duke Energy Indiana Holdco, LLC, the holding company for Duke Energy Indiana, issued 11.05% of its membership interests in exchange for 50% of the total investment amount. Duke Energy has the discretion to determine the timing of the second closing, but the closing will occur no later than January 2023. At the second closing, Duke Energy Indiana Holdco, LLC will issue additional membership interests for the remaining 50% of the total investment amount, and GIC's minority interest ownership in Duke Energy Indiana Holdco, LLC will be 19.9%. Proceeds from the minority interest investment are expected to address common equity needs through 2025 to partially fund Duke Energy's $59 billion capital and investment expenditure plan.

As of September 30, 2021, Duke Energy had approximately $548 million of cash on hand, $6.3 billion available under its $8 billion Master Credit Facility and $500 million available under the $1 billion Three-Year Revolving Credit Facility. Duke Energy expects to have sufficient liquidity in the form of cash on hand, cash from operations and available credit capacity to support its funding needs. Refer to Note 5 to the Condensed Consolidated Financial Statements, "Debt and Credit Facilities," for information regarding Duke Energy's debt issuances and maturities, and available credit facilities including the Master Credit Facility.

Credit Ratings

In March 2021, Moody's Investors Services, Inc. (Moody's) downgraded by one notch the long-term credit ratings for Duke Energy (Parent) and Duke Energy Carolinas. The downgrade reflects Duke Energy's balance sheet objectives. The downgrade for Duke Energy (Parent) and Duke Energy Carolinas also considers the impact for Duke Energy Carolinas and Duke Energy Progress as a result of the 2019 rate case orders and approval of the CCR Settlement Agreement. While these agreements are indicative of a regulatory environment that remains broadly supportive of utility credit quality, their financial terms resulted in current impairment charges and lowered the amount of future cash flow Duke Energy Carolinas and Duke Energy Progress will receive in conjunction with their coal ash remediation spending. As part of the credit rating action, Moody's affirmed Duke Energy's (Parent) short-term and commercial paper credit ratings and confirmed the credit ratings for Duke Energy Progress. Following a January 2021, credit rating downgrade of Duke Energy (Parent) and its subsidiaries, Standard & Poor's Rating Services continues to maintain a stable outlook on Duke Energy Corporation and its subsidiaries as of September 30, 2021.

Cash Flow Information

The following table summarizes Duke Energy’s cash flows.

	Nine Months Ended
	September 30,
(in millions)	2021		2020
Cash flows provided by (used in):
Operating activities	$	7,227	$	6,766
Investing activities	(8,200)		(7,964)
Financing activities	1,160		1,225
Net increase in cash, cash equivalents and restricted cash	187		27
Cash, cash equivalents and restricted cash at beginning of period	556		573
Cash, cash equivalents and restricted cash at end of period	$	743	$	600

OPERATING CASH FLOWS

The following table summarizes key components of Duke Energy’s operating cash flows.

	Nine Months Ended
	September 30,
(in millions)	2021		2020		Variance
Net income	$	2,915	$	1,232	$	1,683
Non-cash adjustments to net income	4,556		6,204		(1,648)
Payments for asset retirement obligations	(389)		(463)		74
Refund of AMT credit carryforwards	—		572		(572)
Working capital	145		(779)		924
Net cash provided by operating activities	$	7,227	$	6,766	$	461

The variance was primarily due to timing of accruals and payments in working capital accounts, partially offset by prior year $572 million refund of AMT credit carryforwards.

109

MD&A LIQUIDITY AND CAPITAL RESOURCES

INVESTING CASH FLOWS

The following table summarizes key components of Duke Energy’s investing cash flows.

	Nine Months Ended
	September 30,
(in millions)	2021		2020		Variance
Capital, investment and acquisition expenditures	$	(7,119)	$	(7,684)	$	565
Other investing items	(1,081)		(280)		(801)
Net cash used in investing activities	$	(8,200)	$	(7,964)	$	(236)

The variance relates primarily to payment made to fund ACP's outstanding debt, partially offset by decreases in capital expenditures due to lower overall investments in the Electric Utilities and Infrastructure, Gas Utilities and Infrastructure and Commercial Renewables segments.

FINANCING CASH FLOWS

The following table summarizes key components of Duke Energy’s financing cash flows.

	Nine Months Ended
	September 30,
(in millions)	2021		2020		Variance
Issuances of long-term debt, net	$	2,683	$	2,694	$	(11)
Issuances of common stock	5		75		(70)
Notes payable, commercial paper and other short-term borrowings	(723)		260		(983)
Dividends paid	(2,340)		(2,113)		(227)
Contributions from noncontrolling interests	1,556		402		1,154
Other financing items	(21)		(93)		72
Net cash provided by financing activities	$	1,160	$	1,225	$	(65)

The variance was primarily due to:

•a $983 million decrease in net proceeds from issuances of notes payable and commercial paper; and

•a $227 million increase in dividends paid.

Partially offset by:

•a $1.154 billion increase in contributions from noncontrolling interests, primarily due to the $1 billion receipt from GIC to make an indirect minority interest investment of 11.05% in Duke Energy Indiana.

OTHER MATTERS

Environmental Regulations

The Duke Energy Registrants are subject to federal, state and local regulations regarding air and water quality, hazardous and solid waste disposal, coal ash and other environmental matters. These regulations can be changed from time to time and result in new obligations of the Duke Energy Registrants. Refer to Note 3 to the Condensed Consolidated Financial Statements, "Regulatory Matters," for further information regarding potential plant retirements and regulatory filings related to the Duke Energy Registrants.

Off-Balance Sheet Arrangements

During the three and nine months ended September 30, 2021, there were no material changes to Duke Energy’s off-balance sheet arrangements. For additional information on Duke Energy’s off-balance sheet arrangements, see “Off-Balance Sheet Arrangements” in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Duke Energy’s Annual Report on Form 10-K for the year ended December 31, 2020.

Contractual Obligations

Duke Energy enters into contracts that require payment of cash at certain specified periods, based on certain specified minimum quantities and prices. During the three and nine months ended September 30, 2021, there were no material changes in Duke Energy's contractual obligations. For an in-depth discussion of Duke Energy’s contractual obligations, see “Contractual Obligations” and “Quantitative and Qualitative Disclosures about Market Risk” in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Duke Energy’s Annual Report on Form 10-K for the year ended December 31, 2020.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

For an in-depth discussion of the Duke Energy Registrants' market risks, see “Quantitative and Qualitative Disclosures about Market Risk” in Item 7 of the Annual Report on Form 10-K for the Duke Energy Registrants. During the three and nine months ended September 30, 2021, there were no material changes to the Duke Energy Registrants' disclosures about market risk.

110

ITEM 4. CONTROLS AND PROCEDURES

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 the Duke Energy Registrants in the reports they file or submit under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified by the 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 the Duke Energy Registrants in the reports they file or submit 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, the Duke Energy Registrants have evaluated the effectiveness of their disclosure controls and procedures (as such term is defined in Rule 13a-15(e) and 15d-15(e) under the Exchange Act) as of September 30, 2021, 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, the Duke Energy Registrants have evaluated changes in internal control over financial reporting (as such term is defined in Rules 13a-15 and 15d-15 under the Exchange Act) that occurred during the fiscal quarter ended September 30, 2021, and have concluded no change has materially affected, or is reasonably likely to materially affect, internal control over financial reporting.

111

OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

For information regarding material legal proceedings, including regulatory and environmental matters, see Note 3, "Regulatory Matters," and Note 4, "Commitments and Contingencies," to the Condensed Consolidated Financial Statements. For additional information, see Item 3, "Legal Proceedings," in Duke Energy's Annual Report on Form 10-K for the year ended December 31, 2020.

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 the Duke Energy Registrants' Annual Report on Form 10-K for the year ended December 31, 2020, which could materially affect the Duke Energy Registrants’ financial condition or future results. The information presented below updates, and should be read in conjunction with, the risk factors and information disclosed in the Annual Report on Form 10-K for the year ended December 31, 2020.

Our business could be negatively affected as a result of actions of activist shareholders.

On May 17, 2021, Elliott who has indicated it holds an economic interest in our outstanding common stock, publicly released a letter it had sent to our Board. On July 19, 2021, Elliott issued a follow-up letter to our Board.

While we strive to maintain constructive communications with our shareholders, activist shareholders may, from time to time, engage in proxy solicitations or advance shareholder proposals, or otherwise attempt to affect changes and assert influence on our Board and management. Perceived uncertainties as to the future direction or governance of the company may cause concern to our current or potential regulators, vendors or strategic partners, or make it more difficult to execute on our strategy or to attract and retain qualified personnel, which may have a material impact on our business and operating results.

In addition, actions such as those described above could cause fluctuations in the trading price of our common stock, based on temporary or speculative market perceptions or other factors that do not necessarily reflect the underlying fundamentals and prospects of our business.

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

None.

112

EXHIBITS

ITEM 6. EXHIBITS

Exhibits filed herein are designated by an asterisk (*). All exhibits not so designated are incorporated by reference to a prior filing, as indicated. Items constituting management contracts or compensatory plans or arrangements are designated by a double asterisk (**). The company agrees to furnish upon request to the commission a copy of any omitted schedules or exhibits upon request on all items designated by a triple asterisk (***).

			Duke		Duke	Duke	Duke	Duke
Exhibit		Duke	Energy	Progress	Energy	Energy	Energy	Energy
Number		Energy	Carolinas	Energy	Progress	Florida	Ohio	Indiana	Piedmont
*3.1	Amended and Restated Limited Liability Company Operating Agreement of Duke Energy Indiana LLC dated August 25, 2021.							X
4.1	Ninety-first Supplemental Indenture, dated as of August 1, 2021 (incorporated by reference to Exhibit 4.1 to registrant's Current Report on Form 8-K filed on August 12, 2021, File No. 1-03382).				X
4.2	Twenty-sixth Supplemental Indenture, dated as of September 28, 2021 (incorporated by reference to Exhibit 4.1 of registrant's Current Report on Form 8-K filed on September 28,2021, File No. 1-32853).	X
10.1	Amended and Restated Limited Liability Company Operating Agreement of Duke Energy Indiana Holdco, LLC (incorporated by reference to Exhibit 10.1 to registrants' Current Report on Form 8-K filed on September 8, 2021, File Nos. 1-32853, 1-03543).	X						X
10.2	Consulting Agreement between Douglas F Esamann and Duke Energy Business Services, LLC, dated as of September 22, 2021 (incorporated by reference to Exhibit 10.1 to registrant's Current Report on Form 8-K filed on September 27, 2021, File No. 1-32853).	X
*31.1.1	Certification of the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.	X
*31.1.2	Certification of the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.		X
*31.1.3	Certification of the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.			X
*31.1.4	Certification of the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.				X
*31.1.5	Certification of the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.					X
*31.1.6	Certification of the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.						X
*31.1.7	Certification of the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.							X
*31.1.8	Certification of the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.								X
*31.2.1	Certification of the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.	X
*31.2.2	Certification of the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.		X

113

EXHIBITS

*31.2.3	Certification of the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.			X
*31.2.4	Certification of the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.				X
*31.2.5	Certification of the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.					X
*31.2.6	Certification of the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.						X
*31.2.7	Certification of the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.							X
*31.2.8	Certification of the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.								X
*32.1.1	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.	X
*32.1.2	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.		X
*32.1.3	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.			X
*32.1.4	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.				X
*32.1.5	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.					X
*32.1.6	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.						X
*32.1.7	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.							X
*32.1.8	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.								X
*32.2.1	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.	X
*32.2.2	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.		X
*32.2.3	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.			X
*32.2.4	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.				X
*32.2.5	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.					X
*32.2.6	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.						X

114

EXHIBITS

*32.2.7	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.							X
*32.2.8	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.								X
*101.INS	XBRL Instance Document (this does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document).	X	X	X	X	X	X	X	X
*101.SCH	XBRL Taxonomy Extension Schema Document.	X	X	X	X	X	X	X	X
*101.CAL	XBRL Taxonomy Calculation Linkbase Document.	X	X	X	X	X	X	X	X
*101.LAB	XBRL Taxonomy Label Linkbase Document.	X	X	X	X	X	X	X	X
*101.PRE	XBRL Taxonomy Presentation Linkbase Document.	X	X	X	X	X	X	X	X
*101.DEF	XBRL Taxonomy Definition Linkbase Document.	X	X	X	X	X	X	X	X
*104	Cover Page Interactive Data File (formatted in Inline XBRL and contained in Exhibit 101).	X	X	X	X	X	X	X	X

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 SEC, to furnish copies of any or all of such instruments to it.

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SIGNATURES

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrants have duly caused this report to be signed on their behalf by the undersigned thereunto duly authorized.

		DUKE ENERGY CORPORATION DUKE ENERGY CAROLINAS, LLC PROGRESS ENERGY, INC. DUKE ENERGY PROGRESS, LLC DUKE ENERGY FLORIDA, LLC DUKE ENERGY OHIO, INC. DUKE ENERGY INDIANA, LLC PIEDMONT NATURAL GAS COMPANY, INC.
Date:	November 4, 2021	/s/ STEVEN K. YOUNG
		Steven K. Young Executive Vice President and Chief Financial Officer (Principal Financial Officer)
Date:	November 4, 2021	/s/ CYNTHIA S. LEE
		Cynthia S. Lee Vice President, Chief Accounting Officer and Controller (Principal Accounting Officer)

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EX-3.1

Exhibit 3.1

AMENDED AND RESTATED LIMITED LIABILITY COMPANY OPERATING AGREEMENT OF

DUKE ENERGY INDIANA, LLC

An Indiana Limited Liability Company

(Formerly known as DUKE ENERGY INDIANA, INC.)

Dated as of August 25, 2021

THIS AMENDED AND RESTATED LIMITED LIABILITY COMPANY OPERATING AGREEMENT OF DUKE ENERGY INDIANA, LLC (formerly known as DUKE ENERGY INDIANA, INC.), (the "Company"), a limited liability company organized pursuant to the Indiana Business Flexibility Act, is executed as of this 25th day of August, 2021.  Duke Energy Indiana Holdco, LLC, a Delaware limited liability company, is the sole member of the Company (the "Member").  Solely for U.S. federal income tax purposes as provided in Treasury Regulations Section 301.7701-3 (as well as for applicable state, local or foreign tax purposes), the Member and the Company intend the Company to be disregarded as an entity that is separate from the Member. For all other purposes (including, without limitation, limited liability protection for the Member from Company liabilities), however, the Member and the Company intend the Company to be respected as a separate legal entity that is separate and apart from the Member.

Article I

FORMATION AND BUSINESS OF THE COMPANY

Section I.1Company Name and Formation. The Company was formed upon the conversion of Duke Energy Indiana, Inc., an Indiana corporation, on January 1, 2016, effective as of the time set forth in the Articles of Entity Conversion (the "Conversion") of the Company filed with the Secretary of State of the State of Indiana.

Section I.2Name.  The name of the Company shall be Duke Energy Indiana, LLC. All business and affairs of the Company shall be conducted under such name or under an assumed name duly approved by the Board.

Section I.3Purpose.  The purpose of the Company shall be to engage in any lawful business for which limited liability companies may be organized under the Act.

Section I.4Term.  The term of the Company shall commence on the date hereof and shall continue indefinitely.

Section I.5Place of Business.  The principal place of business of the Company shall be located in Plainfield, Indiana.  The Company may have such other offices either within or without the State of Indiana as the Board may designate or as the business of the Company may from time to time require.

Section I.6Registered Office and Agency.  The address of the registered office of the Company in the State of Indiana is 150 West Market Street, Suite 800, Indianapolis, Indiana 46204, and the name of the registered agent is C T Corporation System.

Section I.7Authorized Representatives.  The "Authorized Representatives" of a Member that is not a natural person shall be those representatives designated by such Member from time to time to represent such Member in connection with the Company, unless and until replaced or removed by such Member. The written statements and representations of an Authorized Representative for a Member that is not a natural Person shall be authorized statements and representations of such Member with respect to the matters covered by this Agreement with

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respect to a Member that is not a natural Person means a decision or action which has been consented to in writing by any Authorized Representative of such Member.

Section I.8Tax Treatment.  The Company shall be disregarded as an entity separate from its owner for U.S. federal tax purposes as provided in Treasury Regulations Section 301.7701-3 (as well as for applicable state, local or foreign tax purposes).  The Member and the Company shall timely make any and all necessary elections and filings such that the Company shall be treated as disregarded as an entity separate from its owner for U.S. federal income tax purposes (as well as for applicable state, local or foreign tax purposes).

Article II

DEFINITIONS

Section II.1Definitions.  References to an "Article" or a "Section" are, unless otherwise specified, to an Article or a Section of this Agreement.  As used in this Agreement, the following terms shall have the meanings set forth respectively after each:

"Act" shall mean the Indiana Business Flexibility Act (Ind. Code Section 23-18-1, et seq.),as the same may be amended from time to time.

"Affiliate" shall mean with reference to any Person, any other Person of which such Person is a principal, member, director, officer, general partner or employee or any other Person directly or indirectly controlling or controlled by or under direct or indirect common control with such Person.

"Agreement" shall mean this Amended and Restated Limited Liability Company Operating Agreement, as the same may be amended hereafter from time to time as provided herein.

"Authorized Representative" shall have the meaning specified in Section 1.7.

"Board" shall have the meaning set forth in Section 4.1.

"Capital Contribution" means the contribution by the Member to capital of the Company.

"Code" shall mean the Internal Revenue Code of 1986, as amended, and as the same may be amended hereafter from time to time.

"Company" shall have the meaning specified in the introductory paragraph to this Agreement.

"Company Expenses" shall have the meaning specified in Section 3.9.

"Director" shall mean each such Person who is hereafter elected or designated as a Director of the Company, in accordance with the terms of this Agreement, who shall be deemed a "manager" of the Company for all purposes under the Act and other applicable law.

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"Event of Bankruptcy" shall mean the institution by or against a Person of a proceeding seeking a judgment of insolvency or bankruptcy or any other relief under any bankruptcy or insolvency law or other similar law affecting creditors' rights.

"Interest" shall mean (i) a Member's share of the profits and losses of the Company and a Member's rights to receive distributions from the Company in accordance with the provisions of this Agreement and the Act and (ii) such Member's other rights and privileges as herein provided.

"Liquidating Trustee" shall have the meaning set forth in Section 12.2.

"Member"  shall have the meaning specified in the introductory paragraph to this Agreement.

"Officer" shall mean any individual elected or appointed as an officer of the Company pursuant to Section 7.1.

"Person" shall mean an individual, partnership, limited liability company, joint venture, corporation, trust or unincorporated organization, a government or agency or political subdivision thereof and any other entity.

"Related Persons" shall have the meaning specified in Section 3.3.

"Treasury Regulations" shall mean the Income Tax Regulations promulgated under the Code, as the same may be amended hereafter from time to time.

Article III

MANAGEMENT OF THE COMPANY

Section III.1Designation of Directors. The Directors collectively shall have the power on behalf and in the name of the Company to make all decisions and take all actions which they may deem necessary or desirable, including, without limitation, the following:

(a)managing the day-to-day operation of the Company;

(b)entering into, making and performing contracts, agreements and other undertakings binding upon the Company that may be necessary, appropriate or advisable in furtherance of the purposes of the Company and making all decisions and waivers thereunder;

(c)opening and maintaining bank and investment accounts and arrangements, drawing checks and other orders for the payment of money, and designating individuals with authority to sign or give instructions with respect to those accounts and arrangements;

(d)investing Company funds;

(e)maintaining the assets of the Company in good order;

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(f)to the extent that funds of the Company are available therefor, paying debts and obligations of the Company;

(g)borrowing money or otherwise incurring indebtedness on such terms and conditions as the Directors may deem appropriate and, in connection therewith, hypothecating, encumbering and/or granting security interests in the assets of the Company to secure the repayment of such monies or other indebtedness of the Company, provided that in no event shall any such borrowing be recourse to the Member unless expressly agreed in writing by the Member;

(h)executing instruments and documents, including, without limitation, checks, drafts, notes and other negotiable instruments, mortgages or deeds of trust, pledge agreements, security agreements, financing statements, documents providing for the acquisition, mortgaging or disposition of the Company's property, assignments, bills of sale, leases and any other instruments or documents necessary, in the opinion of the Directors or a duly elected or appointed Officer of the Company, acting within the scope of his or her authority, to the business of the Company;

(i)entering into any and all other agreements with any other Person for any purpose in furtherance of the business of the Company, in such form as the Directors or a duly elected or appointed Officer of the Company, acting within the scope of his or her authority, may approve;

(j)the bringing or defending, paying, collecting, compromising, arbitrating, resorting to legal action, or other adjustment of claims or demands of or against the Company;

(k)selecting, removing and changing the authority and responsibility of lawyers, accountants, and other advisers and consultants;

(l)obtaining insurance for the Company;

(m)taking all actions necessary to effectuate transactions pursuant to Article VIII hereof; and

(n)such other matters as may be necessary or advisable in connection with the operation of the business and conduct of affairs of the company and the accomplishment of the purposes of the Company.

The Directors or their duly authorized appointees or Officers of the Company may execute and deliver contracts and agreements on behalf of the Company in furtherance of the foregoing, without the consent of the Member, and otherwise act for and bind the Company. Third parties may conclusively rely upon the act of the Directors as evidence of the authority of the Directors for all purposes in respect of their dealings with the Company.

Section III.2Additional Powers, Duties and Limitations with respect to the Directors.

(a)Generally.  The Directors shall be responsible for, and shall render to the Company, such services as are reasonably necessary for the daily management, conduct and direction of the property, business and affairs of the Company. No compensation shall be paid to

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the Directors for the performance of such services, nor shall the Directors be reimbursed for any expenses incurred in their capacity as such, except as otherwise provided in this Agreement, including without limitation Section 4.3 hereof. No Director shall have the ability individually to bind or act for the Company, rather, the Directors may only act collectively through action of the Board, subject to and in accordance with the terms and conditions of this Agreement.

(b)Limitation on Liability for Acts and Omissions of the Directors.  The Company shall pay any and all liability, loss, cost, expense (including reasonable attorneys' fees and disbursements) or damage incurred or sustained by the Directors by reason of any act or omission in the conduct of the business of the Company in accordance with the provisions of Section 11.1 hereof. The Directors, acting in good faith, shall be entitled to rely on the advice of legal counsel, accountants and/or other experts or professional advisers and any act or omission of the Directors acting in reliance upon such advice shall in no event subject such Directors to liability to the Company or any Member.

Section III.3Limitation on Liabilities and Powers of the Member.  Neither the Directors or their Affiliates or any Member or its Affiliates or any officer, director, partner, member or shareholder, employee or agent of the Directors or any Member (collectively, "Related Persons") shall have (a) any personal liability for any debts, liabilities or obligations of the Company, whether arising in contract or tort or otherwise, or (b) any obligation to the Company, except, in each case, as specifically provided elsewhere in this Agreement or under the Act.  Except to the extent expressly provided for herein and permitted under the Act, the Member shall not participate in the operation, management or control (within the meaning of the Act) of the business of the Company and shall have no right or authority to act for or on behalf of the Company or to sign for or bind the Company.

Section III.4Employment of Third Parties By the Company.  The Company, may, by action of its Officers, from time to time, employ any Person or engage third parties to render accounting, financial advisory and legal services to the Company.  Persons retained or engaged by the Officers, on its behalf, may also be engaged, retained or employed by and act on behalf of the Directors, the Member or any of their respective Affiliates.

Section III.5Filings.  The Directors are hereby authorized to execute and file all instruments, certificates, notices and documents, and to do or cause to be done all such filing, recording, publishing and other acts as may be deemed by the Directors to be necessary or appropriate from time to time to comply with all applicable requirements for the formation or operation or, when appropriate, termination of a limited liability company in the State of Indiana and all other jurisdictions where the Company does or shall desire to conduct its business.

Section III.6Expenses.  The Company will be responsible for all expenses ("Company Expenses"), including, without limitation, (i) all reasonable accounting and legal expenses incurred in connection with Company operations, (ii) all reasonable costs incurred in connection with the preparation of or relating to reports made to the Member, (iii) all reasonable costs related to litigation involving the Company, directly or indirectly, including, without limitation, attorneys' fees incurred in connection therewith, (iv) all reasonable costs related to the

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Company's obligations set forth in Sections 3.2 and 11.1, and (v) all reasonable out-of-pocket expenses related to the organization and formation of the Company.

Article IV

BOARD OF DIRECTORS

Section IV.1Appointment and Removal of Directors. Except as otherwise expressly provided in this Agreement, the Articles of Organization or the Act, all decisions with respect to the management of the business and affairs of the Company shall be made by a Board of Directors (the "Board"), each of whom shall be appointed by the Member.  Any Director may be removed at any time with or without cause by the Member.  Upon the removal of a Director, such Director shall cease to be a "manager" (within the meaning of the Act).

Section IV.2Number and Qualifications of Directors. The number of Directors constituting the Board may be fixed from time to time by the Member.

Section IV.3Compensation of Directors.  Directors, as such, may receive fixed fees and other compensation for their services as Directors as may be determined by the Member, including, without limitation, their services as members of committees of the Board.

Section IV.4Vacancies. Newly created directorships resulting from any increase in the authorized number of Directors or any vacancies in the Board resulting from death, resignation, disqualification, removal from office or any other cause shall be filled by a majority of the Directors then in office, although less than a quorum, or by a sole remaining Director; provided, that in the event that a Director is removed by the Member pursuant to Section 4.1, the Member may at the same time as such removal fill the vacancy caused by such removal; providedfurther, that if the Directors fail to fill any such vacancy within a reasonable period as determined by the Member in its sole discretion, the Member may fill any such vacancy.  Directors so chosen to fill a newly created directorship or other vacancies shall serve until such Director's successor has been duly elected and qualified or until his or her earlier death, resignation or removal as provided in this Agreement.  If any vacancies shall occur in the Board, by reason of death, resignation, disqualification, removal from office or any other cause, the Directors then in office shall continue to act, and actions may be taken by a majority of the Directors then in office, although less than a quorum, or by a sole remaining Director.

Article V

MEETINGS OF DIRECTORS

Section V.1Special Meetings.  Special meetings of the Board may be called at the request of the Member, the Chairman of the Board or a majority of the Board then in office.  The person or persons authorized to call special meetings of the Board may fix the place and time of the meetings.

Section V.2Notice.  Notice of any special meeting of the Board shall be given to each Director at such Director's business or residence in writing by hand delivery, first-class or

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overnight mail or courier service, facsimile or electronic transmission or orally by telephone.  If mailed by first-class mail, such notice shall be deemed adequately delivered when deposited in the United States mails so addressed, with postage thereon prepaid, at least 5 calendar days before such meeting.  If by overnight mail or courier service, such notice shall be deemed adequately delivered when the notice is delivered to the overnight mail or courier service company at least 24 hours before such meeting.  If by facsimile or electronic transmission, such notice shall be deemed adequately delivered when the notice is transmitted at least 12 hours before such meeting.  If by telephone or by hand delivery, the notice shall be given at least 12 hours prior to the time set for the meeting.  Neither the business to be transacted at, nor the purpose of, any regular or special meeting of the Board need be specified in the notice of such meeting.

Section V.3Quorum and Manner of Acting.  Unless the Articles of Organization or this Agreement provide otherwise, a majority of the number of Directors fixed pursuant to this Agreement shall constitute a quorum for the transaction of business at any meeting of the Board.  Unless required by law or the Articles of Organization or this Agreement provide otherwise, the affirmative vote of a majority of the Directors present at a meeting at which a quorum is present and voting on the matter shall be the act of the Board.

Section V.4Action by Consent of Board. On any matter that is to be voted on, consented to or approved by the Board, the Board may take such action without a meeting, without prior notice and without a vote if a consent or consents in writing, setting forth the action so taken, shall be signed by the Directors having not less than the minimum number of votes that would be necessary to authorize or take such action at a meeting at which all Directors entitled to vote thereon were present and voted.  On any matter that is to be voted on by Directors, the Directors may vote in person or by proxy, and such proxy may be granted in writing, by means of electronic transmission or as otherwise permitted by applicable law.  A consent transmitted by electronic transmission by a Director or by a person or persons authorized to act for a Director shall be deemed to be written and signed for purposes of this Agreement. For purposes of this Agreement, the term "electronic transmission" means any form of communication not directly involving the physical transmission of paper that creates a record that may be retained, retrieved and reviewed by a recipient thereof and that may be directly reproduced in paper form by such a recipient through an automated process.

Section V.5Conference Telephone Meetings.  Members of the Board may participate in a meeting of the Board by means of conference telephone or similar communications equipment by means of which all persons participating in the meeting can hear each other, and such participation in a meeting shall constitute presence in person at such meeting.

Article VI

COMMITTEES OF THE BOARD OF DIRECTORS

Section VI.1Committees and Powers.  The Board may designate one or more Committees of the Board, which shall consist of one or more Directors. Any such Committee may to the extent permitted by law exercise such powers and shall have such responsibilities as shall be specified in the designating resolution. A Committee of the Board may not (i) authorize

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distributions; (ii) approve, or propose to the Member, action that is required by law to be approved by the Member; (iii) fill vacancies on any Committee; (iv) authorize or approve reacquisition of Interests, except according to a formula or method prescribed by the Board; or (v) authorize or approve the issuance or sale or contract for the sale of Interests.  The Board shall have power at any time to fill vacancies in, to change the membership of, or to dissolve any such Committee.  Nothing herein shall be deemed to prevent the Board from appointing one or more Committees consisting in whole or in part of persons who are not Directors of the Company; provided, however, that no such Committee shall have or may exercise any authority of the Board.

Section VI.2Quorum and Manner of Acting.  Each Committee shall keep written minutes of its proceedings and shall report such proceedings to the Board when required.  The provisions of this Agreement governing meetings, action without meetings, notice and waiver of notice, and quorum and voting requirements of the Board apply to Committees of the Board established under Section 6.1.

Section VI.3Meetings and Notice.  Each Committee shall fix the time and place of its meetings, unless the Board shall otherwise provide.  Notice of meetings of any Committee shall be given to each member of the Committee in the manner provided for in Section 5.2.

Article VII

OFFICERS

Section VII.1Elected and Appointed Officers.  The elected Officers of the Company shall be a Chief Executive Officer, a President, a Secretary, a Treasurer, a Controller and such other Officers (including, without limitation, Executive Vice Presidents, Senior Vice Presidents and Vice Presidents) as the Board may deem proper.  Elected Officers shall have such powers and duties as generally pertain to their respective offices, subject to the specific provisions of this Article VII, including, without limitation, the duty to engage third parties to render accounting, financial advisory and legal services to the Company on such terms and for such compensation as the Officers may reasonably determine.  Such Officers shall also have such powers and duties as from time to time may be conferred by the Board or by any Committee thereof.  The Board or the Chief Executive Officer may from time to time appoint such other Officers (including one or more Vice Presidents, Assistant Secretaries, Assistant Treasurers and Assistant Controllers), as may be necessary or desirable for the conduct of the business of the Company.  Such other Officers and agents shall have such duties and shall hold their offices for such terms as shall be provided in this Agreement or, to the extent consistent with this Agreement, as may be prescribed by the Board or the Chief Executive Officer.  The Officers of the Company shall consist of such Officers as the Board may designate as Officers from time to time, who may or may not be "executive officers" as defined under rules and regulations of the Securities and Exchange Commission.

Section VII.2Election and Term of Office.  Officers of the Company may be elected by the Board at the regular annual meeting of the Board and at such other times as the Board may deem necessary. Officers may be appointed by the Chief Executive Officer to the extent authority to make such appointments is delegated by the Board to the Chief Executive Officer.  Each Officer shall hold office until such person's successor shall have been duly elected and shall have qualified

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or until such person's death or until he or she shall resign or shall be removed pursuant to Section 7.10.

Section VII.3Chairman of the Board and Chief Executive Officer.  The Chief Executive Officer of the Company shall be the Chairman of the Board and shall be responsible for the general management of the affairs of the Company and shall perform all duties incidental to such person's office which may be required by law and all such other duties as are properly required of the Chief Executive Officer or the Chairman of the Board by the Board.  The Chairman of the Board shall preside at all meetings of the Board and shall make reports to the Board and to the Member, and shall see that all orders and resolutions of the Board and of any Committee thereof are carried into effect. The Chief Executive Officer may also serve as President, if so elected by the Board.

Section VII.4President.  The President shall act in a general executive capacity and shall assist the Chief Executive Officer in the administration and operation of the Company's business and general supervision of its policies and affairs.  The President shall, unless the President is also serving as the Chief Executive Officer, in the absence of or because of the inability to act of the Chief Executive Officer, perform all duties of the Chief Executive Officer and preside at all meetings of the Board.

Section VII.5Vice Presidents.  The Executive Vice Presidents, the Senior Vice Presidents and the Vice Presidents shall have such powers and duties as may be prescribed for them, respectively, by the Board or the Chief Executive Officer.  Each of such Officers shall report to the Chief Executive Officer or such other Officer as the Board or the Chief Executive Officer shall direct.

Section VII.6Secretary.  The Secretary shall attend all meetings of the Board, shall keep a true and faithful record thereof in proper books and shall have the custody and care of the corporate seal, records, minute books and stock books of the Company and of such other books and papers as in the practical business operations of the Company shall naturally belong in the office or custody of the Secretary or as shall be placed in the Secretary's custody by order of the Board.  The Secretary shall keep a suitable record of the address of the Member and shall, except as may be otherwise required by statute or this Agreement, sign and issue all notices required for meetings of the Board.  The Secretary shall sign all papers to which the Secretary's signature may be necessary or appropriate, shall affix and attest the seal of the Company to all instruments requiring the seal, shall have the authority to certify this Agreement, resolutions of the Member or the Board and other documents of the Company as true and correct copies thereof and shall have such other powers and duties as are commonly incidental to the office of Secretary and as may be prescribed by the Board or the Chief Executive Officer.

Section VII.7Treasurer.  The Treasurer shall have charge of and supervision over and be responsible for the funds, securities, receipts and disbursements of the Company; cause the moneys and other valuable effects of the Company to be deposited in the name and to the credit of the Company in such banks or trust companies or with such bankers or other depositories as shall be selected in accordance with resolutions adopted by the Board; cause the funds of the Company to be disbursed by checks or drafts upon the authorized depositories of the Company, and cause to

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be taken and preserved proper vouchers for all moneys disbursed; render to the proper Officers and to the Board and the Finance Committee or similar Committee, if any, whenever requested, a statement of the financial condition of the Company and of all his or her transactions as Treasurer; cause to be kept at the principal executive offices of the Company correct books of account of all its business and transactions; and, in general, perform all duties incident to the office of Treasurer and such other duties as are given to him or her by this Agreement or as may be assigned to him or her by the Board or the Chief Executive Officer.

Section VII.8Controller.  The Controller shall be the chief accounting officer of the Company; shall keep full and accurate accounts of all assets, liabilities, commitments, revenues, costs and expenses, and other financial transactions of the Company in books belonging to the Company, and conform them to sound accounting principles with adequate internal control; shall cause regular audits of these books and records to be made; shall see that all expenditures are made in accordance with procedures duly established, from time to time, by the Company; shall render financial statements upon the request of the Board; and, in general, shall perform all the duties ordinarily connected with the office of Controller and such other duties as may be assigned to him or her by the Board or the Chief Executive Officer.

Section VII.9Assistant Secretaries, Assistant Treasurers and Assistant Controllers.  Assistant Secretaries, Assistant Treasurers and Assistant Controllers, when elected or appointed, shall respectively assist the Secretary, the Treasurer and the Controller in the performance of the respective duties assigned to such principal Officers, and in assisting such principal Officer, each of such assistant Officers shall for such purpose have the powers of such principal Officer; and, in case of the absence, disability, death, resignation or removal from office of any principal Officer, such principal Officer's duties shall, except as otherwise ordered by the Board, temporarily devolve upon such assistant Officer as shall be designated by the Board or the Chief Executive Officer.

Section VII.10Removal.  Any Officer or agent may be removed by the Board at any time and for any reason.  In addition, any Officer or agent appointed by the Chief Executive Officer may be removed by the Chief Executive Officer whenever, in his or her judgment, the best interests of the Company would be served thereby. Any removal shall be without prejudice to the contract rights, if any, of the person so removed.

Section VII.11Vacancies.  A newly created elected office and a vacancy in any elected office because of death, resignation or removal may be filled by the Board.  Any vacancy in any office appointed by the Chief Executive Officer because of death, resignation or removal may be filled by the Chief Executive Officer.

Article VIII

CONTRACTS, CHECKS, DRAFTS, DEPOSITS AND PROXIES

Section VIII.1Contracts.  The Board may authorize any Officer or Officers, agent or agents, to enter into any contract or execute and deliver any instrument in the name of and on behalf of the Company, and such authority may be general or confined to specific instances.

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Section VIII.2Checks and Drafts.  All checks, drafts or other orders for the payment of money, issued in the name of the Company, shall be signed by such Officer or Officers, agent or agents of the Company and in such manner as shall from time to time be determined by the Board or the Chief Executive Officer.

Section VIII.3Deposits.  All funds of the Company not otherwise employed shall be deposited from time to time to the credit of the Company in such depositories as may be selected by or under the authority of the Board.

Section VIII.4Proxies.  Unless otherwise provided by the Board, the Chief Executive Officer, the President or any Executive Vice President, Senior Vice President or Vice President may from time to time appoint an attorney or attorneys or agent or agents of the Company, in the name and on behalf of the Company, to cast the votes which the Company may be entitled to cast as the holder of stock or other securities in any other entity, any of whose stock or other securities may be held by the Company, at meetings of the holders of the stock or other securities of such other entity, or to consent in writing, in the name of the Company as such holder, to any action by such other entity, and may instruct the person or persons so appointed as to the manner of casting such votes or giving such consent, and may execute or cause to be executed in the name and on behalf of the Company and under seal or otherwise, all such written proxies or other instruments as he or she may deem necessary or proper in the premises.

Article IX

CAPITAL CONTRIBUTIONS; ALLOCATIONS AND DISTRIBUTIONS

Section IX.1Capital Contributions.  Upon the formation of the Company, the Member shall not be required to make a Capital Contribution. Capital Contributions shall be made from time to time as the Member shall determine.

Section IX.2Allocation of Profits and Losses.  All profits and losses of the Company shall be allocated to the Member.

Section IX.3Distributions.  All distributions of cash or other assets of the Company shall be made to the Member when and as determined by the Member, subject to any limitations or restrictions provided for in the Act.

Article X

MAINTENANCE OF BOOKS AND RECORDS, ETC.

Section X.1Books and Records.  The Company shall maintain those books and records required to be maintained by Section 23-18-4-8 of the Act, along with such other books and records as the Board or the Controller may determine from time to time.  All such books and records shall at all times be made available at the principal office of the Company and shall be open to the reasonable inspection and examination by the Directors or their duly authorized representatives during normal business hours.

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Section X.2Reports to the Indiana Secretary of State.  Pursuant to Section 23-18-12-11 of the Act, the Directors shall cause a biennial report to be filed with the Indiana Secretary of State every two calendar years following the calendar year in which the Company was organized, which sets forth all of the information as required under that section of the Act.

Article XI

INDEMNIFICATION

Section XI.1In General.  Any person who is or was serving as a Member, Director, Officer, employee or agent of the Company or who, at the request of the Company, is or was serving as a director, manager, officer, employee or agent of another corporation, limited liability company, partnership, joint venture, trust or other enterprise or Person, or as a trustee or administrator under an employee benefit plan, shall be indemnified by the Company, to the fullest extent permitted by law, against (a) litigation expenses, including costs, expenses and reasonable attorneys' fees incurred by any such person in connection with any threatened, pending or completed action, suit or proceedings, whether civil, criminal, administrative or investigative, whether formal or informal, and whether or not brought by or on behalf of the Company, arising out of such person's status as such or such person's activities in any of the foregoing capacities, (b) liability, including payments made by such person in satisfaction of any judgment, money decree, fine (including an excise tax assessed with respect to an employee benefit plan), penalty or settlement for which such person may have become liable in any such action, suit or proceeding, (c) payments made and personal liabilities reasonably incurred in the authorized conduct of the business of the Company or for the preservation of its business and its property and (d) reasonable costs, expenses and attorneys' fees incurred by such person in connection with the enforcement of the indemnification rights provided herein.  Any Person who is or was serving in any of the foregoing capacities for or on behalf of the Company shall be conclusively deemed to be doing or to have done so in reliance upon, and as consideration for, the indemnification rights provided herein.

The rights of indemnification provided herein (which shall be deemed to be a contract between any such person and the Company enforceable on the part of such person notwithstanding any subsequent amendment or repeal of this Agreement) shall inure to the benefit of the successors, estates or legal representatives of any such Person and shall not be exclusive of any other rights to which such Person may be entitled apart from this Agreement, by contract, resolution or otherwise.

Article XII

CESSATION OF MEMBERSHIP, DISSOLUTION, LIQUIDATION AND TERMINATION

Section XII.1Cessation of Membership. A Person shall cease to be a Member only upon the assignment of such Person's entire Interest and as otherwise expressly provided in this Agreement or the Company's Articles of Organization.

Section XII.2Dissolution and Termination.

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(a)The Company shall be dissolved and its affairs shall be wound up upon the first to occur of any of the following events (an "Event of Dissolution"):

(i)the decision by the Board to dissolve, wind up and liquidate the Company; or

(ii)the entry of a judicial dissolution pursuant to Section 23-18-9-2 of the Act.

(b)An Event of Bankruptcy affecting any Member or the transfer of any Interests shall not constitute an Event of Dissolution.

(c)Dissolution of the Company shall be effective on the effective date of the Event of Dissolution, but the Company shall not terminate until the assets thereof have been distributed in accordance with the provisions of Section 12.5 hereof and all other provisions of the Act with respect to the dissolution of a limited liability company have been complied with. Notwithstanding the dissolution of the Company, prior to the termination of the Company, the business, assets and affairs of the Company shall continue to be governed by this Agreement.

Section XII.3Liquidating Trustee. Upon the occurrence of an Event of Dissolution, sole and plenary authority to effectuate the liquidation of the Company shall be vested in the Board or a Person designated by the Board to effectuate the liquidation of the Company or if the Board elects not to effectuate such liquidation and fails to designate a liquidator, such Person as is selected by the Member (the "Liquidating Trustee").  The Liquidating Trustee shall proceed diligently to wind up the affairs of the Company, liquidate the assets of the Company in an orderly and businesslike manner consistent with obtaining the fair value thereof and distribute the assets of the Company in accordance with the provisions of Section 12.5 hereof. A reasonable amount of time shall be allowed for the orderly liquidation of the assets of the Company and the discharge of liabilities to creditors so as to enable the Liquidating Trustee to minimize the losses attendant upon such liquidation. Prior to such distribution of the Company's assets, the Liquidating Trustee shall continue to exploit the rights, activities and properties of the Company consistent with the sale or liquidation thereof, exercising in connection therewith all of the power and authority of the Board as herein set forth.

Section XII.4Accounting upon Dissolution and Termination.  Upon the distribution of the assets of the Company in accordance with the provisions of Section 12.5 hereof, the Liquidating Trustee shall cause the Company's accountants to make a full and proper accounting of the assets, liabilities and operations of the Company, as of and through the date on which such distribution occurs.

Section XII.5Distribution of Assets.

(a)As expeditiously as possible after the occurrence of an Event of Dissolution and the liquidation of the assets of the Company, the assets of the Company, including the proceeds of any such liquidation, shall be applied and distributed in the following order of priority:

13

(i)First, all liabilities and obligations of the Company (including, without limitation, loans from the Member) shall be paid to creditors of the Company or provided for (whether by establishing reasonable reserves or otherwise as the Liquidating Trustee shall reasonably deem appropriate); and

(ii)Second, to the Member.

(b)The Liquidating Trustee shall have the authority to establish reasonable reserves for the payment of liabilities and obligations of the Company or to otherwise provide for the payment of Company liabilities and obligations as the Liquidating Trustee shall reasonably deem appropriate (as aforesaid).  All saleable assets of the Company may be sold in connection with the liquidation of the Company at public or private sale and at such price and upon such terms as the Liquidating Trustee, in its sole discretion, may deem advisable. The Member or any other Related Person may purchase assets at such sale. The Liquidating Trustee shall determine, in its sole discretion, which assets of the Company shall be liquidated through sale and which assets of the Company shall be distributed in kind.

Section XII.6Termination. Upon compliance with the foregoing distribution plan, the Company shall cease to be such, and the Liquidating Trustee shall execute, acknowledge and cause to be filed with the Secretary of State of the State of Indiana Articles of Dissolution of the Company.

Article XIII

MISCELLANEOUS

Section XIII.1Successors and Assigns; Third Party Beneficiaries. This Agreement shall be binding upon and inure to the benefit of the Member and its legal representatives, administrators, executors, successors and assigns. Except as set forth in Article XI, none of the provisions of this Agreement shall be for the benefit of or enforceable by any Person not a party hereto.

Section XIII.2Sole Limited Liability Company Operating Agreement. This Agreement, together with the documents expressly referred to herein, each as amended or supplemented, constitutes the sole limited liability company operating agreement of the Company.

Section XIII.3Assignment.  An assignee of a Member shall automatically become a Member, provided the assignee consents.

Section XIII.4Choice of Law; Forum and Waiver of Jury Trial. This Agreement shall be construed in accordance with the laws of the State of Indiana, without regard to the choice of laws rules thereof, and the obligations, rights and remedies of the Member hereunder shall be determined in accordance with such laws. Any legal suit, action or proceeding against any of the parties hereto arising out of or relating to this Agreement shall only be instituted in any federal or state court in Indiana.

14

Section XIII.5Interpretation.  Wherever from the context it appears appropriate, each term stated in either the singular or the plural shall include the singular and the plural, and pronouns stated in the masculine, the feminine or neuter gender shall include the masculine, the feminine and the neuter.

Section XIII.6Captions. Captions contained in this Agreement are inserted only as a matter of convenience and in no way define, limit or extend or otherwise affect the scope or intent of this Agreement or any provision hereof.

Section XIII.7Severability. If any provision of this Agreement, or the application of such provision to any Person or circumstance, shall be held invalid, illegal or unenforceable in any jurisdiction, the validity, legality and enforceability of the remaining provisions of this Agreement, or the application of such provision in jurisdictions or to Persons or circumstances other than those to which it is held invalid, illegal or unenforceable shall not be affected thereby.

Section XIII.8Counterparts. This Agreement may be executed in several counterparts, each of which shall be deemed an original but all of which shall constitute one and the same instrument.

Section XIII.9Non-Waiver. No provision of this Agreement shall be deemed to have been waived unless such waiver is contained in a written notice given to the party claiming such waiver has occurred, provided that no such waiver shall be deemed to be a waiver of any other or further obligation or liability of the party or parties in whose favor the waiver was given.

Section XIII.10Time Periods. In applying any provision of this Agreement which requires that an act be done or not be done a specified number of days prior to an event or that an act be done during a period of a specified number of days prior to an event, calendar days shall be used, the day of the doing of the act shall be excluded, and the day of the event shall be included.

Section XIII.11Resignations.  Any Director or any Officer, whether elected or appointed, may resign at any time by giving written notice of such resignation to the Board, the Chairman of the Board or the Secretary, and such resignation shall be deemed to be effective when communicated unless the notice specifies a later effective date. No formal action shall be required on behalf of the Company to make any such resignation effective.  Upon the effectiveness of any such resignation, such Director shall cease to be a "manager" (within the meaning of the Act)

Section XIII.12Continuation of Obligations.  The Company hereby expressly covenants, agrees and confirms, notwithstanding the Conversion, (i) that its obligation promptly to pay, perform and discharge when due each and every debt, obligation, covenant and agreement incurred, made or to be paid, performed or discharged by the Company under the indenture of mortgage or deed of trust, dated September 1, 1939, as supplemented (the "Mortgage"), from Duke Energy Indiana, Inc. to Deutsche Bank National Trust Company, as successor Trustee, continues upon the Conversion, (ii) that, pursuant to Section 23-1-38.5-15 of the Indiana Business Corporation Law, title to all real estate and other property owned by the Company, prior to the Conversion, continues to be vested in the Company upon the Conversion, without reversion or impairment and that all liabilities of the Company, prior to the Conversion, continue as liabilities of the Company upon the Conversion; (iii) that all rights of holders of First Mortgage Bonds

15

outstanding under the Mortgage and of the Trustee which existed immediately prior to the Conversion are preserved unimpaired; and (iv) that all debts, liabilities and duties of the Company under the Mortgage which existed immediately prior to the Conversion may be enforced against it to the same extent as if said debts, liabilities and duties had originally been incurred or contracted by it in its capacity as an Indiana limited liability company.

Article XIV

AMENDMENTS

Section XIV.1Amendment.  Except as required by law or as otherwise provided in the Articles of Organization or in this Agreement, this Agreement may be amended or repealed and a new Agreement may be adopted only by the Member.

[Remainder of Page Intentionally Left  Blank]

16

IN WITNESS WHEREOF, the undersigned has executed this Agreement as of the date set forth on the first page of this Agreement.

DUKE ENERGY INDIANA HOLDCO, LLC

By:     /s/ Stan Pinegar    
    Name:    Stan Pinegar
    Title:    State President - Indiana

EX-31.1.8

EXHIBIT 31.1.8

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Lynn J. Good, certify that:

1)    I have reviewed this quarterly report on Form 10-Q of Piedmont Natural Gas Company, Inc.;

2)    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3)    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4)    The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Acts Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)    Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)    Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5)    The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 4, 2021

/s/ LYNN J. GOOD

Lynn J. Good
Chief Executive Officer

EX-31.1.6

EXHIBIT 31.1.6

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Lynn J. Good, certify that:

1)    I have reviewed this quarterly report on Form 10-Q of Duke Energy Ohio, Inc.;

2)    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3)    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4)    The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Acts Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)    Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)    Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5)    The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 4, 2021

/s/ LYNN J. GOOD

Lynn J. Good
Chief Executive Officer

EX-31.1.1

EXHIBIT 31.1.1

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Lynn J. Good, certify that:

1)    I have reviewed this quarterly report on Form 10-Q of Duke Energy Corporation;

2)    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3)    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4)    The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Acts Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)    Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)    Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5)    The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 4, 2021

/s/ LYNN J. GOOD

Lynn J. Good
Chair, President and
Chief Executive Officer

EX-31.1.2

EXHIBIT 31.1.2

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Lynn J. Good, certify that:

1)    I have reviewed this quarterly report on Form 10-Q of Duke Energy Carolinas, LLC;

2)    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3)    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4)    The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Acts Rules 13a–15(f) and 15d–15(f)) for the registrant and have:

a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)    Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)    Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5)    The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 4, 2021

/s/ LYNN J. GOOD

Lynn J. Good
Chief Executive Officer

EX-31.1.3

EXHIBIT 31.1.3

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Lynn J. Good, certify that:

1)    I have reviewed this quarterly report on Form 10-Q of Progress Energy, Inc.;

2)    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3)    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4)    The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Acts Rules 13a–15(f) and 15d–15(f)) for the registrant and have:

a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)    Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)    Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5)    The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 4, 2021

/s/ LYNN J. GOOD

Lynn J. Good
Chief Executive Officer

EX-31.1.4

EXHIBIT 31.1.4

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Lynn J. Good, certify that:

1)    I have reviewed this quarterly report on Form 10-Q of Duke Energy Progress, LLC;

2)    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3)    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4)    The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Acts Rules 13a–15(f) and 15d–15(f)) for the registrant and have:

a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)    Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)    Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5)    The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 4, 2021

/s/ LYNN J. GOOD

Lynn J. Good
Chief Executive Officer

EX-31.1.5

EXHIBIT 31.1.5

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Lynn J. Good, certify that:

1)    I have reviewed this quarterly report on Form 10-Q of Duke Energy Florida, LLC;

2)    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3)    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4)    The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Acts Rules 13a–15(f) and 15d–15(f)) for the registrant and have:

a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)    Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)    Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5)    The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 4, 2021

/s/ LYNN J. GOOD

Lynn J. Good
Chief Executive Officer

EX-31.1.7

EXHIBIT 31.1.7

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Lynn J. Good, certify that:

1)    I have reviewed this quarterly report on Form 10-Q of Duke Energy Indiana, LLC;

2)    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3)    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4)    The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Acts Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)    Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)    Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5)    The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 4, 2021

/s/ LYNN J. GOOD

Lynn J. Good
Chief Executive Officer

EX-31.2.3

EXHIBIT 31.2.3

CERTIFICATION OF THE CHIEF FINANCIAL OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Steven K. Young, certify that:

1)    I have reviewed this quarterly report on Form 10-Q of Progress Energy, Inc.;

2)    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3)    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4)    The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Acts Rules 13a–15(f) and 15d–15(f)) for the registrant and have:

a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)    Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)    Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5)    The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 4, 2021

/s/ STEVEN K. YOUNG

Steven K. Young
Executive Vice President and Chief Financial Officer 

EX-31.2.1

EXHIBIT 31.2.1

CERTIFICATION OF THE CHIEF FINANCIAL OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Steven K. Young, certify that:

1)    I have reviewed this quarterly report on Form 10-Q of Duke Energy Corporation;

2)    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3)    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4)    The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Acts Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)    Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)    Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5)    The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 4, 2021

/s/ STEVEN K. YOUNG

Steven K. Young
Executive Vice President and Chief Financial Officer

EX-31.2.2

EXHIBIT 31.2.2

CERTIFICATION OF THE CHIEF FINANCIAL OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Steven K. Young, certify that:

1)    I have reviewed this quarterly report on Form 10-Q of Duke Energy Carolinas, LLC;

2)    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3)    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4)    The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Acts Rules 13a–15(f) and 15d–15(f)) for the registrant and have:

a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)    Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)    Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5)    The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 4, 2021

/s/ STEVEN K. YOUNG

Steven K. Young
Executive Vice President and Chief Financial Officer

EX-31.2.4

EXHIBIT 31.2.4

CERTIFICATION OF THE CHIEF FINANCIAL OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Steven K. Young, certify that:

1)    I have reviewed this quarterly report on Form 10-Q of Duke Energy Progress, LLC;

2)    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3)    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4)    The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Acts Rules 13a–15(f) and 15d–15(f)) for the registrant and have:

a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)    Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)    Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5)    The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 4, 2021

/s/ STEVEN K. YOUNG

Steven K. Young
Executive Vice President and Chief Financial Officer

EX-31.2.5

EXHIBIT 31.2.5

CERTIFICATION OF THE CHIEF FINANCIAL OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Steven K. Young, certify that:

1)    I have reviewed this quarterly report on Form 10-Q of Duke Energy Florida, LLC;

2)    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3)    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4)    The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Acts Rules 13a–15(f) and 15d–15(f)) for the registrant and have:

a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)    Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)    Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5)    The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 4, 2021

/s/ STEVEN K. YOUNG

Steven K. Young
Executive Vice President and Chief Financial Officer

EX-31.2.6

EXHIBIT 31.2.6

CERTIFICATION OF THE CHIEF FINANCIAL OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Steven K. Young, certify that:

1)    I have reviewed this quarterly report on Form 10-Q of Duke Energy Ohio, Inc.;

2)    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3)    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4)    The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Acts Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)    Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)    Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5)    The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 4, 2021

/s/ STEVEN K. YOUNG

Steven K. Young
Executive Vice President and Chief Financial Officer

EX-31.2.7

EXHIBIT 31.2.7

CERTIFICATION OF THE CHIEF FINANCIAL OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Steven K. Young, certify that:

1)    I have reviewed this quarterly report on Form 10-Q of Duke Energy Indiana, LLC;

2)    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3)    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4)    The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Acts Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)    Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)    Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5)    The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 4, 2021

/s/ STEVEN K. YOUNG

Steven K. Young
Executive Vice President and Chief Financial Officer

EX-31.2.8

EXHIBIT 31.2.8

CERTIFICATION OF THE CHIEF FINANCIAL OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Steven K. Young, certify that:

1)    I have reviewed this quarterly report on Form 10-Q of Piedmont Natural Gas Company, Inc.;

2)    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3)    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4)    The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Acts Rules 13a–15(f) and 15d–15(f)) for the registrant and have:

a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)    Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)    Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5)    The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 4, 2021

/s/ STEVEN K. YOUNG

Steven K. Young
Executive Vice President and Chief Financial Officer 

EX-32.1.2

EXHIBIT 32.1.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Duke Energy Carolinas, LLC (“Duke Energy Carolinas”) on Form 10-Q for the period ending September 30, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Lynn J. Good, Chief Executive Officer of Duke Energy Carolinas, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)    The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Duke Energy Carolinas.

/s/ LYNN J. GOOD

Lynn J. Good
Chief Executive Officer

November 4, 2021

EX-32.1.1

EXHIBIT 32.1.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Duke Energy Corporation (“Duke Energy”) on Form 10-Q for the period ending September 30, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Lynn J. Good, Chair, President and Chief Executive Officer of Duke Energy, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)    The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Duke Energy.

/s/ LYNN J. GOOD

Lynn J. Good
Chair, President and
Chief Executive Officer

November 4, 2021

EX-32.1.3

EXHIBIT 32.1.3

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Progress Energy, Inc. (“Progress Energy”) on Form 10-Q for the period ending September 30, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Lynn J. Good, Chief Executive Officer of Progress Energy, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)    The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Progress Energy.

/s/ LYNN J. GOOD

Lynn J. Good
Chief Executive Officer

November 4, 2021

EX-32.1.4

EXHIBIT 32.1.4

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Duke Energy Progress, LLC (“Duke Energy Progress”) on Form 10-Q for the period ending September 30, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Lynn J. Good, Chief Executive Officer of Duke Energy Progress, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)    The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Duke Energy Progress.

/s/ LYNN J. GOOD

Lynn J. Good
Chief Executive Officer

November 4, 2021

EX-32.1.5

EXHIBIT 32.1.5

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Duke Energy Florida, LLC (“Duke Energy Florida”) on Form 10-Q for the period ending September 30, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Lynn J. Good, Chief Executive Officer of Duke Energy Florida, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)    The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Duke Energy Florida.

/s/ LYNN J. GOOD

Lynn J. Good
Chief Executive Officer

November 4, 2021

EX-32.1.6

EXHIBIT 32.1.6

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Duke Energy Ohio, Inc. (“Duke Energy Ohio”) on Form 10-Q for the period ending September 30, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Lynn J. Good, Chief Executive Officer of Duke Energy Ohio, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)    The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Duke Energy Ohio.

/s/ LYNN J. GOOD

Lynn J. Good
Chief Executive Officer

November 4, 2021

EX-32.1.7

EXHIBIT 32.1.7

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Duke Energy Indiana, LLC (“Duke Energy Indiana”) on Form 10-Q for the period ending September 30, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Lynn J. Good, Chief Executive Officer of Duke Energy Indiana, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)    The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Duke Energy Indiana.

/s/ LYNN J. GOOD

Lynn J. Good
Chief Executive Officer

November 4, 2021

EX-32.1.8

EXHIBIT 32.1.8

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Piedmont Natural Gas Company, Inc. (“Piedmont”) on Form 10-Q for the period ending September 30, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Lynn J. Good, Chief Executive Officer of Piedmont, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)    The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Piedmont.

/s/ LYNN J. GOOD

Lynn J. Good
Chief Executive Officer

November 4, 2021

EX-32.2.7

EXHIBIT 32.2.7

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Duke Energy Indiana, LLC (“Duke Energy Indiana”) on Form 10-Q for the period ending September 30, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Steven K. Young, Executive Vice President and Chief Financial Officer of Duke Energy Indiana, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)    The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Duke Energy Indiana.

/s/ STEVEN K. YOUNG

Steven K. Young
Executive Vice President and Chief Financial Officer

November 4, 2021

EX-32.2.6

EXHIBIT 32.2.6

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Duke Energy Ohio, Inc. (“Duke Energy Ohio”) on Form 10-Q for the period ending September 30, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Steven K. Young, Executive Vice President and Chief Financial Officer of Duke Energy Ohio, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)    The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Duke Energy Ohio.

/s/ STEVEN K. YOUNG

Steven K. Young
Executive Vice President and Chief Financial Officer

November 4, 2021

EX-32.2.5

EXHIBIT 32.2.5

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Duke Energy Florida, LLC (“Duke Energy Florida”) on Form 10-Q for the period ending September 30, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Steven K. Young, Executive Vice President and Chief Financial Officer of Duke Energy Florida, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)    The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Duke Energy Florida.

/s/ STEVEN K. YOUNG

Steven K. Young
Executive Vice President and Chief Financial Officer

November 4, 2021

EX-32.2.4

EXHIBIT 32.2.4

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Duke Energy Progress, LLC (“Duke Energy Progress”) on Form 10-Q for the period ending September 30, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Steven K. Young, Executive Vice President and Chief Financial Officer of Duke Energy Progress, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)    The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Duke Energy Progress.

/s/ STEVEN K. YOUNG

Steven K. Young
Executive Vice President and Chief Financial Officer

November 4, 2021

EX-32.2.3

EXHIBIT 32.2.3

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Progress Energy, Inc. (“Progress Energy”) on Form 10-Q for the period ending September 30, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Steven K. Young, Executive Vice President and Chief Financial Officer of Progress Energy, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)    The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Progress Energy.

/s/ STEVEN K. YOUNG

Steven K. Young
Executive Vice President and Chief Financial Officer

November 4, 2021

EX-32.2.8

EXHIBIT 32.2.8

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Piedmont Natural Gas Company, Inc. (“Piedmont”) on Form 10-Q for the period ending September 30, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Steven K. Young, Executive Vice President and Chief Financial Officer of Piedmont, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)    The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Piedmont.

/s/ STEVEN K. YOUNG

Steven K. Young
Executive Vice President and Chief Financial Officer

November 4, 2021

EX-32.2.1

EXHIBIT 32.2.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Duke Energy Corporation (“Duke Energy”) on Form 10-Q for the period ending September 30, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Steven K. Young, Executive Vice President and Chief Financial Officer of Duke Energy, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)    The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Duke Energy.

/s/ STEVEN K. YOUNG

Steven K. Young
Executive Vice President and Chief Financial Officer

November 4, 2021

EX-32.2.2

EXHIBIT 32.2.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Duke Energy Carolinas, LLC (“Duke Energy Carolinas”) on Form 10-Q for the period ending September 30, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Steven K. Young, Executive Vice President and Chief Financial Officer of Duke Energy Carolinas, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)    The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Duke Energy Carolinas.

/s/ STEVEN K. YOUNG

Steven K. Young
Executive Vice President and Chief Financial Officer

November 4, 2021

XML

Cover Page - shares	9 Months Ended
	Sep. 30, 2021	Oct. 31, 2021
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	1-32853
Entity Registrant Name	DUKE ENERGY CORPORATION
Entity Tax Identification Number	20-2777218
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	526 South Church Street
Entity Address, City or Town	Charlotte
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	28202-1803
City Area Code	704
Local Phone Number	382-3853
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		769,343,372
Entity Central Index Key	0001326160
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false
Duke Energy Carolinas
Document Information [Line Items]
Entity File Number	1-4928
Entity Registrant Name	DUKE ENERGY CAROLINAS, LLC
Entity Tax Identification Number	56-0205520
Entity Incorporation, State or Country Code	NC
Entity Address, Address Line One	526 South Church Street
Entity Address, City or Town	Charlotte
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	28202-1803
City Area Code	704
Local Phone Number	382-3853
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0000030371
Current Fiscal Year End Date	--12-31
Progress Energy
Document Information [Line Items]
Entity File Number	1-15929
Entity Registrant Name	PROGRESS ENERGY, INC.
Entity Tax Identification Number	56-2155481
Entity Incorporation, State or Country Code	NC
Entity Address, Address Line One	410 South Wilmington Street
Entity Address, City or Town	Raleigh
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	27601-1748
City Area Code	704
Local Phone Number	382-3853
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001094093
Current Fiscal Year End Date	--12-31
Duke Energy Progress
Document Information [Line Items]
Entity File Number	1-3382
Entity Registrant Name	DUKE ENERGY PROGRESS, LLC
Entity Tax Identification Number	56-0165465
Entity Incorporation, State or Country Code	NC
Entity Address, Address Line One	410 South Wilmington Street
Entity Address, City or Town	Raleigh
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	27601-1748
City Area Code	704
Local Phone Number	382-3853
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0000017797
Current Fiscal Year End Date	--12-31
Duke Energy Florida
Document Information [Line Items]
Entity File Number	1-3274
Entity Registrant Name	DUKE ENERGY FLORIDA, LLC
Entity Tax Identification Number	59-0247770
Entity Incorporation, State or Country Code	FL
Entity Address, Address Line One	299 First Avenue North
Entity Address, City or Town	St. Petersburg
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	33701
City Area Code	704
Local Phone Number	382-3853
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0000037637
Current Fiscal Year End Date	--12-31
Duke Energy Ohio
Document Information [Line Items]
Entity File Number	1-1232
Entity Registrant Name	DUKE ENERGY OHIO, INC.
Entity Tax Identification Number	31-0240030
Entity Incorporation, State or Country Code	OH
Entity Address, Address Line One	139 East Fourth Street
Entity Address, City or Town	Cincinnati
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	45202
City Area Code	704
Local Phone Number	382-3853
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0000020290
Current Fiscal Year End Date	--12-31
Duke Energy Indiana
Document Information [Line Items]
Entity File Number	1-3543
Entity Registrant Name	DUKE ENERGY INDIANA, LLC
Entity Tax Identification Number	35-0594457
Entity Incorporation, State or Country Code	IN
Entity Address, Address Line One	1000 East Main Street
Entity Address, City or Town	Plainfield
Entity Address, State or Province	IN
Entity Address, Postal Zip Code	46168
City Area Code	704
Local Phone Number	382-3853
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0000081020
Current Fiscal Year End Date	--12-31
Piedmont
Document Information [Line Items]
Entity File Number	1-6196
Entity Registrant Name	PIEDMONT NATURAL GAS COMPANY, INC.
Entity Tax Identification Number	56-0556998
Entity Incorporation, State or Country Code	NC
Entity Address, Address Line One	4720 Piedmont Row Drive
Entity Address, City or Town	Charlotte
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	28210
City Area Code	704
Local Phone Number	364-3120
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0000078460
Current Fiscal Year End Date	--12-31
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	DUK
Security Exchange Name	NYSE
Junior Subordinated Debentures 5.625% Coupon Due September 2078
Document Information [Line Items]
Title of 12(b) Security	5.625% Junior Subordinated Debentures
Trading Symbol	DUKB
Security Exchange Name	NYSE
Depositary Share
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares
Trading Symbol	DUK PR A
Security Exchange Name	NYSE

XML

Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating Revenues
Regulated electric		$ 6,495	$ 6,315	$ 16,972	$ 16,402
Regulated natural gas		263	214	1,314	1,115
Nonregulated electric and other		193	192	573	574
Total operating revenues		6,951	6,721	18,859	18,091
Operating Expenses
Operation, maintenance and other		1,507	1,450	4,319	4,142
Depreciation and amortization		1,265	1,217	3,698	3,497
Property and other taxes		371	324	1,073	1,003
Impairment of assets and other charges		211	28	342	36
Total operating expenses		5,273	4,909	14,564	13,622
(Losses) Gains on Sales of Other Assets and Other, net		9	2	11	10
Operating Income		1,687	1,814	4,306	4,479
Other Income and Expenses
Equity in earnings (losses) of unconsolidated affiliates		22	(80)	14	(2,004)
Other income and expenses, net		238	127	493	310
Total other income and expenses		260	47	507	(1,694)
Interest Expense		581	522	1,688	1,627
Income Before Income Taxes		1,366	1,339	3,125	1,158
Income Tax Expense (Benefit)		90	105	210	(74)
Net Income		1,276	1,234	2,915	1,232
Add: Net Loss Attributable to Noncontrolling Interests		129	70	247	208
Net Income and Comprehensive Income		1,405	1,304	3,162	1,440
Less: Preferred Dividends		39	39	92	93
Net Income Available to Duke Energy Corporation Common Stockholders		1,366	1,265	3,070	1,347
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments	[1]	1	1	3	1
Net unrealized (losses) gains on cash flow hedges	[1]	9	(83)	(59)	(159)
Unrealized (losses) gains on available-for-sale securities	[1]	(2)	(2)	(6)	5
Other Comprehensive Income (Loss), net of tax	[1]	10	(80)	(53)	(145)
Comprehensive Income		1,286	1,154	2,862	1,087
Add: Comprehensive Loss Attributable to Noncontrolling Interests		(128)	(70)	(240)	(220)
Comprehensive Income Attributable to Duke Energy		$ 1,414	$ 1,224	$ 3,102	$ 1,307
Net income (loss) attributable to Duke Energy Corporation common stockholders
Basic (in usd per share)		$ 1.79	$ 1.74	$ 4.00	$ 1.85
Diluted (in usd per share)		$ 1.79	$ 1.74	$ 4.00	$ 1.85
Weighted Average Shares Outstanding
Basic (in shares)		769	735	769	735
Diluted (in shares)		769	735	769	735
Duke Energy Carolinas
Operating Revenues
Total operating revenues		$ 2,104	$ 2,058	$ 5,430	$ 5,416
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		452	497	1,218	1,326
Operation, maintenance and other		471	402	1,347	1,218
Depreciation and amortization		366	372	1,088	1,090
Property and other taxes		91	57	248	213
Impairment of assets and other charges		163	20	238	22
Total operating expenses		1,543	1,348	4,139	3,869
(Losses) Gains on Sales of Other Assets and Other, net		(1)	1	1	1
Operating Income		560	711	1,292	1,548
Other Income and Expenses
Total other income and expenses		126	42	218	128
Interest Expense		137	122	400	370
Income Before Income Taxes		549	631	1,110	1,306
Income Tax Expense (Benefit)		16	76	40	178
Net Income and Comprehensive Income		533	555	1,070	1,128
Progress Energy
Operating Revenues
Total operating revenues		3,233	3,197	8,417	8,117
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,074	1,088	2,702	2,628
Operation, maintenance and other		636	646	1,863	1,789
Depreciation and amortization		504	472	1,430	1,356
Property and other taxes		144	147	419	419
Impairment of assets and other charges		42	1	79	1
Total operating expenses		2,400	2,354	6,493	6,193
(Losses) Gains on Sales of Other Assets and Other, net		8	3	9	9
Operating Income		841	846	1,933	1,933
Other Income and Expenses
Total other income and expenses		86	24	167	89
Interest Expense		200	194	592	599
Income Before Income Taxes		727	676	1,508	1,423
Income Tax Expense (Benefit)		94	70	174	190
Net Income		633	606	1,334	1,233
Add: Net Loss Attributable to Noncontrolling Interests		(1)	(1)	(1)	(1)
Net Income and Comprehensive Income		632	605	1,333	1,232
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments		(1)			1
Net unrealized (losses) gains on cash flow hedges		1	1	2	3
Unrealized (losses) gains on available-for-sale securities			1		1
Other Comprehensive Income (Loss), net of tax			2	2	5
Comprehensive Income		633	608	1,336	1,238
Add: Comprehensive Loss Attributable to Noncontrolling Interests		1	1	1	1
Comprehensive Income Attributable to Duke Energy		632	607	1,335	1,237
Duke Energy Progress
Operating Revenues
Total operating revenues		1,667	1,626	4,417	4,207
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		523	537	1,368	1,337
Operation, maintenance and other		368	348	1,092	970
Depreciation and amortization		290	289	811	833
Property and other taxes		39	38	129	129
Impairment of assets and other charges		42	5	60	5
Total operating expenses		1,262	1,217	3,460	3,274
(Losses) Gains on Sales of Other Assets and Other, net		7	3	8	8
Operating Income		412	412	965	941
Other Income and Expenses
Total other income and expenses		67	11	111	52
Interest Expense		79	66	226	203
Income Before Income Taxes		400	357	850	790
Income Tax Expense (Benefit)		25	11	50	79
Net Income and Comprehensive Income		375	346	800	711
Duke Energy Florida
Operating Revenues
Total operating revenues		1,561	1,567	3,987	3,897
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		552	551	1,335	1,291
Operation, maintenance and other		263	292	760	806
Depreciation and amortization		214	183	619	523
Property and other taxes		105	110	290	290
Impairment of assets and other charges			(4)	19	(4)
Total operating expenses		1,134	1,132	3,023	2,906
(Losses) Gains on Sales of Other Assets and Other, net		1		1
Operating Income		428	435	965	991
Other Income and Expenses
Total other income and expenses		18	11	54	36
Interest Expense		79	81	239	245
Income Before Income Taxes		367	365	780	782
Income Tax Expense (Benefit)		70	78	149	159
Net Income and Comprehensive Income		297	287	631	623
Other Comprehensive Income (Loss), net of tax
Unrealized (losses) gains on available-for-sale securities			1		1
Other Comprehensive Income (Loss), net of tax			1		1
Comprehensive Income Attributable to Duke Energy		297	288	631	624
Duke Energy Ohio
Operating Revenues
Regulated electric		413	394	1,119	1,070
Regulated natural gas		93	79	375	324
Total operating revenues		506	473	1,494	1,394
Operating Expenses
Operation, maintenance and other		116	115	335	333
Depreciation and amortization		79	72	228	208
Property and other taxes		91	83	266	244
Impairment of assets and other charges				5
Total operating expenses		414	367	1,204	1,089
Operating Income		92	106	290	305
Other Income and Expenses
Total other income and expenses		4	4	14	11
Interest Expense		29	26	82	75
Income Before Income Taxes		67	84	222	241
Income Tax Expense (Benefit)		9	14	34	40
Net Income and Comprehensive Income		58	70	188	201
Duke Energy Indiana
Operating Revenues
Total operating revenues		886	761	2,366	2,070
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		292	222	710	577
Operation, maintenance and other		173	207	543	564
Depreciation and amortization		154	149	458	415
Property and other taxes		16	15	57	57
Impairment of assets and other charges				8
Total operating expenses		635	593	1,776	1,613
(Losses) Gains on Sales of Other Assets and Other, net		1
Operating Income		252	168	590	457
Other Income and Expenses
Total other income and expenses		12	9	31	28
Interest Expense		49	29	148	114
Income Before Income Taxes		215	148	473	371
Income Tax Expense (Benefit)		34	29	77	72
Net Income and Comprehensive Income		181	119	396	299
Piedmont
Operating Revenues
Total operating revenues		195	162	1,016	871
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		66	39	354	254
Operation, maintenance and other		77	75	231	234
Depreciation and amortization		51	45	150	133
Property and other taxes		16	13	44	37
Impairment of assets and other charges		4	7	9	7
Total operating expenses		214	179	788	665
Operating Income		(19)	(17)	228	206
Other Income and Expenses
Equity in earnings (losses) of unconsolidated affiliates				7	7
Total other income and expenses		16	16	51	44
Interest Expense		29	29	88	89
Income Before Income Taxes		(32)	(30)	191	161
Income Tax Expense (Benefit)		(8)	(5)	16	6
Net Income and Comprehensive Income		(24)	(25)	175	155
Fuel used in electric generation and purchased power
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,844	1,849	4,702	4,645
Fuel used in electric generation and purchased power | Duke Energy Ohio
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		119	94	294	258
Cost of natural gas
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		75	41	430	299
Cost of natural gas | Duke Energy Ohio
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		$ 9	$ 3	$ 76	$ 46

[1] Net of income tax impacts of approximately $24 million for the three months ended September 30, 2020, and $16 million and $43 million for the nine months ended September 30, 2021, and 2020, respectively. All other periods presented include immaterial income tax impacts.

XML

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net income (loss)		$ 1,276	$ 1,234	$ 2,915	$ 1,232
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments	[1]	1	1	3	1
Net unrealized gains (losses) on cash flow hedges	[1]	9	(83)	(59)	(159)
Reclassification into earnings from cash flow hedges	[1]	2	4	9	8
Unrealized (losses) gains on available-for-sale securities	[1]	(2)	(2)	(6)	5
Other Comprehensive Income (Loss), net of tax	[1]	10	(80)	(53)	(145)
Comprehensive Income		1,286	1,154	2,862	1,087
Add: Comprehensive Loss Attributable to Noncontrolling Interests		128	70	240	220
Comprehensive Income Attributable to Duke Energy		1,414	1,224	3,102	1,307
Less: Preferred Dividends		39	39	92	93
Comprehensive Income Available to Duke Energy Corporation Common Stockholders		$ 1,375	$ 1,185	$ 3,010	$ 1,214

[1] Net of income tax impacts of approximately $24 million for the three months ended September 30, 2020, and $16 million and $43 million for the nine months ended September 30, 2021, and 2020, respectively. All other periods presented include immaterial income tax impacts.

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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Other comprehensive income (loss), tax	$ 24	$ 16	$ 43

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Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Current Assets
Cash and cash equivalents	$ 548	$ 259
Receivables of VIEs (net of allowance for doubtful accounts)	998	1,009
Receivables (net of allowance for doubtful accounts)	2,431	2,144
Inventory	2,900	3,167
Regulatory assets (includes amounts related to VIEs)	1,791	1,641
Other (includes amounts related to VIEs)	768	462
Total current assets	9,436	8,682
Property, Plant and Equipment
Cost	160,652	155,580
Accumulated depreciation and amortization	(50,543)	(48,827)
Facilities to be retired, net	127	29
Net property, plant and equipment	110,236	106,782
Other Noncurrent Assets
Goodwill	19,303	19,303
Regulatory assets (includes amounts related to VIEs)	12,247	12,421
Nuclear decommissioning trust funds	9,861	9,114
Operating lease right-of-use assets, net	1,287	1,524
Investments in equity method unconsolidated affiliates	951	961
Other (includes amounts related to VIEs)	3,686	3,601
Total other noncurrent assets	47,335	46,924
Total Assets	167,007	162,388
Current Liabilities
Accounts payable	2,888	3,144
Notes payable and commercial paper	2,098	2,873
Taxes accrued	908	482
Interest accrued	558	537
Current maturities of long-term debt (includes amounts related to VIEs)	4,873	4,238
Asset retirement obligations	673	718
Regulatory liabilities	1,319	1,377
Other	2,239	2,936
Total current liabilities	15,556	16,305
Long-Term Debt (includes amounts related to VIEs)	57,929	55,625
Other Noncurrent Liabilities
Deferred income taxes	9,875	9,244
Asset retirement obligations	12,278	12,286
Regulatory liabilities	15,530	15,029
Operating lease liabilities	1,093	1,340
Accrued pension and other post-retirement benefit costs	988	969
Investment tax credits	804	687
Other (includes amounts related to VIEs)	1,714	1,719
Total other noncurrent liabilities	42,282	41,274
Commitments and Contingencies
Equity
Common stock	1	1
Additional paid-in capital	44,348	43,767
Retained earnings	3,293	2,471
Accumulated other comprehensive loss	(297)	(237)
Total Duke Energy Corporation stockholders' equity	49,307	47,964
Noncontrolling interests	1,933	1,220
Total equity	51,240	49,184
Total Liabilities and Equity	167,007	162,388
Variable Interest Entity
Current Assets
Regulatory assets (includes amounts related to VIEs)	54	53
Other (includes amounts related to VIEs)	347	296
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	896	937
Other (includes amounts related to VIEs)	134	81
Current Liabilities
Current maturities of long-term debt (includes amounts related to VIEs)	221	472
Long-Term Debt (includes amounts related to VIEs)	3,923	3,535
Other Noncurrent Liabilities
Other (includes amounts related to VIEs)	341	316
Duke Energy Carolinas
Current Assets
Cash and cash equivalents	21	21
Receivables of VIEs (net of allowance for doubtful accounts)	915	696
Receivables (net of allowance for doubtful accounts)	278	247
Receivables from affiliated companies	85	124
Inventory	969	1,010
Regulatory assets (includes amounts related to VIEs)	460	473
Other (includes amounts related to VIEs)	104	20
Total current assets	2,832	2,591
Property, Plant and Equipment
Cost	51,790	50,640
Accumulated depreciation and amortization	(17,959)	(17,453)
Facilities to be retired, net	89
Net property, plant and equipment	33,920	33,187
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	2,743	2,996
Nuclear decommissioning trust funds	5,434	4,977
Operating lease right-of-use assets, net	95	110
Other (includes amounts related to VIEs)	1,197	1,187
Total other noncurrent assets	9,469	9,270
Total Assets	46,221	45,048
Current Liabilities
Accounts payable	673	1,000
Accounts payable to affiliated companies	184	199
Notes payable to affiliated companies	86	506
Taxes accrued	391	76
Interest accrued	137	117
Current maturities of long-term debt (includes amounts related to VIEs)	357	506
Asset retirement obligations	245	264
Regulatory liabilities	503	473
Other	516	546
Total current liabilities	3,092	3,687
Long-Term Debt (includes amounts related to VIEs)	12,318	11,412
Long-Term Debt Payable to Affiliated Companies	300	300
Other Noncurrent Liabilities
Deferred income taxes	3,893	3,842
Asset retirement obligations	5,134	5,086
Regulatory liabilities	6,867	6,535
Operating lease liabilities	83	97
Accrued pension and other post-retirement benefit costs	64	73
Investment tax credits	288	236
Other (includes amounts related to VIEs)	558	626
Total other noncurrent liabilities	16,887	16,495
Commitments and Contingencies
Equity
Member's equity	13,631	13,161
Accumulated other comprehensive loss	(7)	(7)
Member's Equity	13,624	13,154
Total Liabilities and Equity	46,221	45,048
Progress Energy
Current Assets
Cash and cash equivalents	102	59
Receivables of VIEs (net of allowance for doubtful accounts)	981	901
Receivables (net of allowance for doubtful accounts)	268	228
Receivables from affiliated companies	61	157
Inventory	1,255	1,375
Regulatory assets (includes amounts related to VIEs)	864	758
Other (includes amounts related to VIEs)	178	109
Total current assets	3,709	3,587
Property, Plant and Equipment
Cost	59,976	57,892
Accumulated depreciation and amortization	(19,211)	(18,368)
Facilities to be retired, net	27	29
Net property, plant and equipment	40,792	39,553
Other Noncurrent Assets
Goodwill	3,655	3,655
Regulatory assets (includes amounts related to VIEs)	5,785	5,775
Nuclear decommissioning trust funds	4,427	4,137
Operating lease right-of-use assets, net	714	690
Other (includes amounts related to VIEs)	1,175	1,227
Total other noncurrent assets	15,756	15,484
Total Assets	60,257	58,624
Current Liabilities
Accounts payable	898	919
Accounts payable to affiliated companies	221	289
Notes payable to affiliated companies	3,123	2,969
Taxes accrued	284	121
Interest accrued	175	202
Current maturities of long-term debt (includes amounts related to VIEs)	1,932	1,426
Asset retirement obligations	234	283
Regulatory liabilities	541	640
Other	856	793
Total current liabilities	8,264	7,642
Long-Term Debt (includes amounts related to VIEs)	17,406	17,688
Long-Term Debt Payable to Affiliated Companies	150	150
Other Noncurrent Liabilities
Deferred income taxes	4,784	4,396
Asset retirement obligations	5,850	5,866
Regulatory liabilities	5,335	5,051
Operating lease liabilities	623	623
Accrued pension and other post-retirement benefit costs	490	505
Other (includes amounts related to VIEs)	473	462
Total other noncurrent liabilities	17,555	16,903
Commitments and Contingencies
Equity
Additional paid-in capital	9,149	9,143
Retained earnings	7,743	7,109
Accumulated other comprehensive loss	(13)	(15)
Total Duke Energy Corporation stockholders' equity	16,879	16,237
Noncontrolling interests	3	4
Total equity	16,882	16,241
Total Liabilities and Equity	60,257	58,624
Progress Energy | Variable Interest Entity
Current Assets
Regulatory assets (includes amounts related to VIEs)	54	53
Other (includes amounts related to VIEs)	17	39
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	896	937
Current Liabilities
Current maturities of long-term debt (includes amounts related to VIEs)	56	305
Long-Term Debt (includes amounts related to VIEs)	1,546	1,252
Duke Energy Progress
Current Assets
Cash and cash equivalents	51	39
Receivables of VIEs (net of allowance for doubtful accounts)	532	500
Receivables (net of allowance for doubtful accounts)	162	132
Receivables from affiliated companies	68	50
Inventory	815	911
Regulatory assets (includes amounts related to VIEs)	499	492
Other (includes amounts related to VIEs)	116	60
Total current assets	2,243	2,184
Property, Plant and Equipment
Cost	36,666	35,759
Accumulated depreciation and amortization	(13,365)	(12,801)
Facilities to be retired, net	27	29
Net property, plant and equipment	23,328	22,987
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	3,955	3,976
Nuclear decommissioning trust funds	3,857	3,500
Operating lease right-of-use assets, net	402	346
Other (includes amounts related to VIEs)	772	740
Total other noncurrent assets	8,986	8,562
Total Assets	34,557	33,733
Current Liabilities
Accounts payable	392	454
Accounts payable to affiliated companies	113	215
Notes payable to affiliated companies	117	295
Taxes accrued	163	85
Interest accrued	68	99
Current maturities of long-term debt (includes amounts related to VIEs)	1,207	603
Asset retirement obligations	234	283
Regulatory liabilities	439	530
Other	442	411
Total current liabilities	3,175	2,975
Long-Term Debt (includes amounts related to VIEs)	8,491	8,505
Long-Term Debt Payable to Affiliated Companies	150	150
Other Noncurrent Liabilities
Deferred income taxes	2,488	2,298
Asset retirement obligations	5,407	5,352
Regulatory liabilities	4,685	4,394
Operating lease liabilities	359	323
Accrued pension and other post-retirement benefit costs	234	242
Investment tax credits	129	132
Other (includes amounts related to VIEs)	79	102
Total other noncurrent liabilities	13,381	12,843
Commitments and Contingencies
Equity
Member's Equity	9,360	9,260
Total Liabilities and Equity	34,557	33,733
Duke Energy Florida
Current Assets
Cash and cash equivalents	40	11
Receivables of VIEs (net of allowance for doubtful accounts)	449	401
Receivables (net of allowance for doubtful accounts)	104	94
Receivables from affiliated companies	3	3
Inventory	439	464
Regulatory assets (includes amounts related to VIEs)	365	265
Other (includes amounts related to VIEs)	35	41
Total current assets	1,435	1,279
Property, Plant and Equipment
Cost	23,300	22,123
Accumulated depreciation and amortization	(5,839)	(5,560)
Net property, plant and equipment	17,461	16,563
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	1,829	1,799
Nuclear decommissioning trust funds	570	637
Operating lease right-of-use assets, net	312	344
Other (includes amounts related to VIEs)	351	335
Total other noncurrent assets	3,062	3,115
Total Assets	21,958	20,957
Current Liabilities
Accounts payable	506	465
Accounts payable to affiliated companies	129	85
Notes payable to affiliated companies	603	196
Taxes accrued	177	82
Interest accrued	72	69
Current maturities of long-term debt (includes amounts related to VIEs)	276	823
Regulatory liabilities	102	110
Other	403	374
Total current liabilities	2,268	2,204
Long-Term Debt (includes amounts related to VIEs)	7,273	7,092
Other Noncurrent Liabilities
Deferred income taxes	2,382	2,191
Asset retirement obligations	443	514
Regulatory liabilities	649	658
Operating lease liabilities	265	300
Accrued pension and other post-retirement benefit costs	225	231
Other (includes amounts related to VIEs)	265	209
Total other noncurrent liabilities	4,229	4,103
Commitments and Contingencies
Equity
Member's equity	8,190	7,560
Accumulated other comprehensive loss	(2)	(2)
Member's Equity	8,188	7,558
Total Liabilities and Equity	21,958	20,957
Duke Energy Florida | Variable Interest Entity
Current Assets
Regulatory assets (includes amounts related to VIEs)	54	53
Other (includes amounts related to VIEs)	17	39
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	896	937
Current Liabilities
Current maturities of long-term debt (includes amounts related to VIEs)	56	305
Long-Term Debt (includes amounts related to VIEs)	1,196	1,002
Duke Energy Ohio
Current Assets
Cash and cash equivalents	16	14
Receivables (net of allowance for doubtful accounts)	107	98
Receivables from affiliated companies	77	102
Inventory	114	110
Regulatory assets (includes amounts related to VIEs)	61	39
Other (includes amounts related to VIEs)	45	31
Total current assets	420	394
Property, Plant and Equipment
Cost	11,531	11,022
Accumulated depreciation and amortization	(3,102)	(3,013)
Net property, plant and equipment	8,429	8,009
Other Noncurrent Assets
Goodwill	920	920
Regulatory assets (includes amounts related to VIEs)	634	610
Operating lease right-of-use assets, net	19	20
Other (includes amounts related to VIEs)	83	72
Total other noncurrent assets	1,656	1,622
Total Assets	10,505	10,025
Current Liabilities
Accounts payable	304	279
Accounts payable to affiliated companies	59	68
Notes payable to affiliated companies	451	169
Taxes accrued	210	247
Interest accrued	32	31
Current maturities of long-term debt (includes amounts related to VIEs)	50	50
Asset retirement obligations	17	3
Regulatory liabilities	63	65
Other	68	70
Total current liabilities	1,254	982
Long-Term Debt (includes amounts related to VIEs)	3,017	3,014
Long-Term Debt Payable to Affiliated Companies	25	25
Other Noncurrent Liabilities
Deferred income taxes	1,032	981
Asset retirement obligations	95	108
Regulatory liabilities	734	748
Operating lease liabilities	19	20
Accrued pension and other post-retirement benefit costs	114	113
Other (includes amounts related to VIEs)	92	99
Total other noncurrent liabilities	2,086	2,069
Commitments and Contingencies
Equity
Common stock	762	762
Additional paid-in capital	2,776	2,776
Retained earnings	585	397
Total Duke Energy Corporation stockholders' equity	4,123	3,935
Total Liabilities and Equity	10,505	10,025
Duke Energy Indiana
Current Assets
Cash and cash equivalents	14	7
Receivables (net of allowance for doubtful accounts)	81	55
Receivables from affiliated companies	62	112
Notes receivable from affiliated companies	252
Inventory	367	473
Regulatory assets (includes amounts related to VIEs)	196	125
Other (includes amounts related to VIEs)	59	37
Total current assets	1,031	809
Property, Plant and Equipment
Cost	17,320	17,382
Accumulated depreciation and amortization	(5,550)	(5,661)
Net property, plant and equipment	11,770	11,721
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	1,300	1,203
Operating lease right-of-use assets, net	51	55
Other (includes amounts related to VIEs)	276	253
Total other noncurrent assets	1,627	1,511
Total Assets	14,428	14,041
Current Liabilities
Accounts payable	239	188
Accounts payable to affiliated companies	198	88
Notes payable to affiliated companies		131
Taxes accrued	83	62
Interest accrued	59	51
Current maturities of long-term debt (includes amounts related to VIEs)	151	70
Asset retirement obligations	177	168
Regulatory liabilities	147	111
Other	104	83
Total current liabilities	1,158	952
Long-Term Debt (includes amounts related to VIEs)	3,791	3,871
Long-Term Debt Payable to Affiliated Companies	150	150
Other Noncurrent Liabilities
Deferred income taxes	1,289	1,228
Asset retirement obligations	966	1,008
Regulatory liabilities	1,573	1,627
Operating lease liabilities	49	53
Accrued pension and other post-retirement benefit costs	172	171
Investment tax credits	172	168
Other (includes amounts related to VIEs)	53	30
Total other noncurrent liabilities	4,274	4,285
Commitments and Contingencies
Equity
Member's Equity	5,055	4,783
Total Liabilities and Equity	14,428	14,041
Piedmont
Current Assets
Receivables (net of allowance for doubtful accounts)	96	250
Receivables from affiliated companies	11	10
Inventory	68	68
Regulatory assets (includes amounts related to VIEs)	125	153
Other (includes amounts related to VIEs)	59	20
Total current assets	359	501
Property, Plant and Equipment
Cost	9,733	9,134
Accumulated depreciation and amortization	(1,862)	(1,749)
Facilities to be retired, net	11
Net property, plant and equipment	7,882	7,385
Other Noncurrent Assets
Goodwill	49	49
Regulatory assets (includes amounts related to VIEs)	335	302
Operating lease right-of-use assets, net	17	20
Investments in equity method unconsolidated affiliates	100	88
Other (includes amounts related to VIEs)	282	270
Total other noncurrent assets	783	729
Total Assets	9,024	8,615
Current Liabilities
Accounts payable	184	230
Accounts payable to affiliated companies	31	79
Notes payable to affiliated companies	315	530
Taxes accrued	41	23
Interest accrued	35	34
Current maturities of long-term debt (includes amounts related to VIEs)		160
Regulatory liabilities	64	88
Other	76	69
Total current liabilities	746	1,213
Long-Term Debt (includes amounts related to VIEs)	2,968	2,620
Other Noncurrent Liabilities
Deferred income taxes	875	821
Asset retirement obligations	21	20
Regulatory liabilities	1,004	1,044
Operating lease liabilities	15	19
Accrued pension and other post-retirement benefit costs	6	8
Other (includes amounts related to VIEs)	175	155
Total other noncurrent liabilities	2,096	2,067
Commitments and Contingencies
Equity
Common stock	1,635	1,310
Retained earnings	1,579	1,405
Total Duke Energy Corporation stockholders' equity	3,214	2,715
Total Liabilities and Equity	9,024	8,615
Preferred stock, Series A
Equity
Preferred stock	973	973
Preferred stock, Series B
Equity
Preferred stock	$ 989	$ 989

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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Allowance for doubtful accounts - receivables	$ 48	$ 29
Regulatory assets (includes amounts related to VIEs)	1,791	1,641
Current Assets: Other	768	462
Regulatory assets (includes amounts related to VIEs)	12,247	12,421
Other Noncurrent Assets: Other	3,686	3,601
Current maturities of long-term debt (includes amounts related to VIEs)	4,873	4,238
Long-Term Debt	57,929	55,625
Other, noncurrent liabilities	$ 1,714	$ 1,719
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	2,000,000,000	2,000,000,000
Common stock, shares outstanding (in shares)	769,000,000	769,000,000
Preferred stock, Series A
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, depositary shares authorized (in shares)	40,000,000	40,000,000
Preferred stock, depositary shares outstanding (in shares)	40,000,000	40,000,000
Preferred stock, Series B
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, depositary shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, depositary shares outstanding (in shares)	1,000,000	1,000,000
Variable Interest Entity
Allowance for doubtful accounts - receivables of VIEs	$ 75	$ 117
Regulatory assets (includes amounts related to VIEs)	54	53
Current Assets: Other	347	296
Regulatory assets (includes amounts related to VIEs)	896	937
Other Noncurrent Assets: Other	134	81
Current maturities of long-term debt (includes amounts related to VIEs)	221	472
Long-Term Debt	3,923	3,535
Other, noncurrent liabilities	341	316
Duke Energy Carolinas
Allowance for doubtful accounts - receivables	2	1
Allowance for doubtful accounts - receivables of VIEs	40	22
Regulatory assets (includes amounts related to VIEs)	460	473
Current Assets: Other	104	20
Regulatory assets (includes amounts related to VIEs)	2,743	2,996
Other Noncurrent Assets: Other	1,197	1,187
Current maturities of long-term debt (includes amounts related to VIEs)	357	506
Long-Term Debt	12,318	11,412
Other, noncurrent liabilities	558	626
Progress Energy
Allowance for doubtful accounts - receivables	11	8
Regulatory assets (includes amounts related to VIEs)	864	758
Current Assets: Other	178	109
Regulatory assets (includes amounts related to VIEs)	5,785	5,775
Other Noncurrent Assets: Other	1,175	1,227
Current maturities of long-term debt (includes amounts related to VIEs)	1,932	1,426
Long-Term Debt	17,406	17,688
Other, noncurrent liabilities	$ 473	$ 462
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100	100
Common stock, shares outstanding (in shares)	100	100
Progress Energy | Variable Interest Entity
Allowance for doubtful accounts - receivables of VIEs	$ 25	$ 29
Regulatory assets (includes amounts related to VIEs)	54	53
Current Assets: Other	17	39
Regulatory assets (includes amounts related to VIEs)	896	937
Current maturities of long-term debt (includes amounts related to VIEs)	56	305
Long-Term Debt	1,546	1,252
Duke Energy Progress
Allowance for doubtful accounts - receivables	4	4
Regulatory assets (includes amounts related to VIEs)	499	492
Current Assets: Other	116	60
Regulatory assets (includes amounts related to VIEs)	3,955	3,976
Other Noncurrent Assets: Other	772	740
Current maturities of long-term debt (includes amounts related to VIEs)	1,207	603
Long-Term Debt	8,491	8,505
Other, noncurrent liabilities	79	102
Duke Energy Progress | Variable Interest Entity
Allowance for doubtful accounts - receivables of VIEs	17	19
Duke Energy Florida
Allowance for doubtful accounts - receivables	8	4
Regulatory assets (includes amounts related to VIEs)	365	265
Current Assets: Other	35	41
Regulatory assets (includes amounts related to VIEs)	1,829	1,799
Other Noncurrent Assets: Other	351	335
Current maturities of long-term debt (includes amounts related to VIEs)	276	823
Long-Term Debt	7,273	7,092
Other, noncurrent liabilities	265	209
Duke Energy Florida | Variable Interest Entity
Allowance for doubtful accounts - receivables of VIEs	8	10
Regulatory assets (includes amounts related to VIEs)	54	53
Current Assets: Other	17	39
Regulatory assets (includes amounts related to VIEs)	896	937
Current maturities of long-term debt (includes amounts related to VIEs)	56	305
Long-Term Debt	1,196	1,002
Duke Energy Ohio
Allowance for doubtful accounts - receivables	4	4
Regulatory assets (includes amounts related to VIEs)	61	39
Current Assets: Other	45	31
Regulatory assets (includes amounts related to VIEs)	634	610
Other Noncurrent Assets: Other	83	72
Current maturities of long-term debt (includes amounts related to VIEs)	50	50
Long-Term Debt	3,017	3,014
Other, noncurrent liabilities	$ 92	$ 99
Common stock, par value (in usd per share)	$ 8.50	$ 8.50
Common stock, shares authorized (in shares)	120,000,000	120,000,000
Common stock, shares outstanding (in shares)	90,000,000	90,000,000
Duke Energy Indiana
Allowance for doubtful accounts - receivables	$ 3	$ 3
Regulatory assets (includes amounts related to VIEs)	196	125
Current Assets: Other	59	37
Regulatory assets (includes amounts related to VIEs)	1,300	1,203
Other Noncurrent Assets: Other	276	253
Current maturities of long-term debt (includes amounts related to VIEs)	151	70
Long-Term Debt	3,791	3,871
Other, noncurrent liabilities	53	30
Piedmont
Allowance for doubtful accounts - receivables	15	12
Regulatory assets (includes amounts related to VIEs)	125	153
Current Assets: Other	59	20
Regulatory assets (includes amounts related to VIEs)	335	302
Other Noncurrent Assets: Other	282	270
Current maturities of long-term debt (includes amounts related to VIEs)		160
Long-Term Debt	2,968	2,620
Other, noncurrent liabilities	$ 175	$ 155
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares outstanding (in shares)	100,000,000	100,000,000

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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 2,915	$ 1,232
Net income	3,162	1,440
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	4,189	4,081
Equity in (earnings) losses of unconsolidated affiliates	(14)	2,004
Equity component of AFUDC	(126)	(112)
Impairment of assets and other charges	342	36
Deferred income taxes	206	210
Payments for asset retirement obligations	(389)	(463)
Provision for rate refunds	(41)	(15)
Refund of AMT credit carryforwards		572
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	116	87
Receivables	(167)	58
Inventory	268	43
Other current assets	(643)	199
Increase (decrease) in
Accounts payable	(146)	(563)
Taxes accrued	431	386
Other current liabilities	10	(284)
Other assets	199	(338)
Other liabilities	77	(367)
Net cash provided by operating activities	7,227	6,766
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(7,089)	(7,408)
Contributions to equity method investments	(30)	(276)
Purchases of debt and equity securities	(4,292)	(6,160)
Proceeds from sales and maturities of debt and equity securities	4,335	6,087
Disbursements to canceled equity method investments	(855)
Other	(269)	(207)
Net cash used in investing activities	(8,200)	(7,964)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	6,379	6,162
Proceeds from the issuance of common stock	5	75
Payments for the redemption of long-term debt	(3,696)	(3,468)
Proceeds from the issuance of short-term debt with original maturities greater than 90 days	109	2,372
Payments for the redemption of short-term debt with original maturities greater than 90 days	(997)	(1,143)
Notes payable and commercial paper	165	(969)
Contributions from noncontrolling interests	1,556	402
Dividends paid	(2,340)	(2,113)
Other	(21)	(93)
Net cash provided by financing activities	1,160	1,225
Net increase in cash, cash equivalents and restricted cash	187	27
Cash, cash equivalents and restricted cash at beginning of period	556	573
Cash, cash equivalents and restricted cash at end of period	743	600
Significant non-cash transactions:
Accrued capital expenditures	998	992
Non-cash dividends		82
Duke Energy Carolinas
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	1,070	1,128
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,295	1,295
Equity component of AFUDC	(46)	(46)
Loss on sales of other assets	(1)
Impairment of assets and other charges	238	22
Deferred income taxes	(146)	(103)
Payments for asset retirement obligations	(132)	(127)
Provision for rate refunds	(29)	(1)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(1)
Receivables	(172)	41
Receivables from affiliated companies	39	50
Inventory	41	4
Other current assets	(153)	197
Increase (decrease) in
Accounts payable	(254)	(313)
Accounts payable to affiliated companies	(15)	(55)
Taxes accrued	315	352
Other current liabilities	72	(121)
Other assets	52	(72)
Other liabilities	167	(23)
Net cash provided by operating activities	2,340	2,228
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,947)	(1,931)
Purchases of debt and equity securities	(2,465)	(1,313)
Proceeds from sales and maturities of debt and equity securities	2,465	1,313
Notes receivable from affiliated companies		(65)
Other	(122)	(105)
Net cash used in investing activities	(2,069)	(2,101)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,367	965
Payments for the redemption of long-term debt	(616)	(457)
Notes payable to affiliated companies	(421)	(29)
Distributions to parent	(600)	(600)
Other	(1)	(1)
Net cash provided by financing activities	(271)	(122)
Net increase in cash, cash equivalents and restricted cash		5
Cash, cash equivalents and restricted cash at beginning of period	21	18
Cash, cash equivalents and restricted cash at end of period	21	23
Significant non-cash transactions:
Accrued capital expenditures	308	295
Progress Energy
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	1,334	1,233
Net income	1,333	1,232
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,707	1,734
Equity component of AFUDC	(37)	(30)
Impairment of assets and other charges	79	1
Deferred income taxes	235	(3)
Payments for asset retirement obligations	(206)	(287)
Provision for rate refunds	(22)	4
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	117	(13)
Receivables	(123)	(207)
Receivables from affiliated companies	96	32
Inventory	120	46
Other current assets	(347)	214
Increase (decrease) in
Accounts payable	79	(124)
Accounts payable to affiliated companies	(68)	(102)
Taxes accrued	161	263
Other current liabilities	(36)	(41)
Other assets	(3)	(154)
Other liabilities	(139)	(102)
Net cash provided by operating activities	2,947	2,464
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(2,628)	(2,602)
Purchases of debt and equity securities	(1,583)	(4,554)
Proceeds from sales and maturities of debt and equity securities	1,649	4,543
Notes receivable from affiliated companies		164
Other	(131)	(114)
Net cash used in investing activities	(2,693)	(2,563)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,190	1,791
Payments for the redemption of long-term debt	(977)	(1,555)
Notes payable to affiliated companies	154	338
Dividends to parent	(700)	(400)
Other	(2)	(13)
Net cash provided by financing activities	(335)	161
Net increase in cash, cash equivalents and restricted cash	(81)	62
Cash, cash equivalents and restricted cash at beginning of period	200	126
Cash, cash equivalents and restricted cash at end of period	119	188
Significant non-cash transactions:
Accrued capital expenditures	290	311
Duke Energy Progress
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	800	711
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	951	972
Equity component of AFUDC	(25)	(22)
Impairment of assets and other charges	60	5
Deferred income taxes	22	(33)
Payments for asset retirement obligations	(129)	(249)
Provision for rate refunds	(22)	4
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	108
Receivables	(66)	(34)
Receivables from affiliated companies	(18)	7
Inventory	95	24
Other current assets	(79)	82
Increase (decrease) in
Accounts payable	20	(185)
Accounts payable to affiliated companies	(102)	(59)
Taxes accrued	75	190
Other current liabilities	(36)	(24)
Other assets	48	(185)
Other liabilities	(32)	21
Net cash provided by operating activities	1,670	1,225
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,313)	(1,142)
Purchases of debt and equity securities	(1,306)	(1,269)
Proceeds from sales and maturities of debt and equity securities	1,291	1,238
Other	(36)	(31)
Net cash used in investing activities	(1,364)	(1,204)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,190	1,296
Payments for the redemption of long-term debt	(605)	(985)
Notes payable to affiliated companies	(178)	101
Distributions to parent	(700)	(400)
Other	(1)	(12)
Net cash provided by financing activities	(294)
Net increase in cash, cash equivalents and restricted cash	12	21
Cash, cash equivalents and restricted cash at beginning of period	39	22
Cash, cash equivalents and restricted cash at end of period	51	43
Significant non-cash transactions:
Accrued capital expenditures	82	124
Duke Energy Florida
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	631	623
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	752	755
Equity component of AFUDC	(12)	(8)
Impairment of assets and other charges	19	(4)
Deferred income taxes	207	19
Payments for asset retirement obligations	(77)	(38)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	7	(17)
Receivables	(57)	(172)
Receivables from affiliated companies		(3)
Inventory	25	22
Other current assets	(247)	41
Increase (decrease) in
Accounts payable	59	63
Accounts payable to affiliated companies	44	(54)
Taxes accrued	95	217
Other current liabilities	(5)	(20)
Other assets	(46)	48
Other liabilities	(94)	(136)
Net cash provided by operating activities	1,301	1,336
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,316)	(1,460)
Purchases of debt and equity securities	(277)	(3,284)
Proceeds from sales and maturities of debt and equity securities	358	3,305
Notes receivable from affiliated companies		173
Other	(95)	(82)
Net cash used in investing activities	(1,330)	(1,348)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt		495
Payments for the redemption of long-term debt	(372)	(570)
Notes payable to affiliated companies	408	66
Net cash provided by financing activities	36	(9)
Net increase in cash, cash equivalents and restricted cash	7	(21)
Cash, cash equivalents and restricted cash at beginning of period	50	56
Cash, cash equivalents and restricted cash at end of period	57	35
Significant non-cash transactions:
Accrued capital expenditures	208	187
Duke Energy Ohio
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	188	201
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	231	211
Equity component of AFUDC	(5)	(4)
Impairment of assets and other charges	5
Deferred income taxes	27	31
Payments for asset retirement obligations	(1)	(1)
Provision for rate refunds	12	10
(Increase) decrease in
Receivables	(9)	(5)
Receivables from affiliated companies	(11)	35
Inventory	(4)	5
Other current assets	(34)	5
Increase (decrease) in
Accounts payable	27	(28)
Accounts payable to affiliated companies	(9)	(14)
Taxes accrued	(37)	(23)
Other current liabilities	(12)	6
Other assets	(35)	(24)
Other liabilities	8	(7)
Net cash provided by operating activities	341	398
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(615)	(611)
Notes receivable from affiliated companies	36
Other	(42)	(34)
Net cash used in investing activities	(621)	(645)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt		467
Notes payable to affiliated companies	282	(227)
Net cash provided by financing activities	282	240
Net increase in cash, cash equivalents and restricted cash	2	(7)
Cash, cash equivalents and restricted cash at beginning of period	14	17
Cash, cash equivalents and restricted cash at end of period	16	10
Significant non-cash transactions:
Accrued capital expenditures	103	92
Duke Energy Indiana
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	396	299
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	460	416
Equity component of AFUDC	(19)	(18)
Impairment of assets and other charges	8
Deferred income taxes	19	11
Payments for asset retirement obligations	(49)	(48)
(Increase) decrease in
Receivables	(7)	15
Receivables from affiliated companies	17	(5)
Inventory	106	10
Other current assets	(58)	12
Increase (decrease) in
Accounts payable	46	(1)
Accounts payable to affiliated companies	(15)	(22)
Taxes accrued	25	65
Other current liabilities	23	(2)
Other assets	11	(41)
Other liabilities	3	104
Net cash provided by operating activities	966	795
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(584)	(669)
Purchases of debt and equity securities	(34)	(24)
Proceeds from sales and maturities of debt and equity securities	16	15
Notes receivable from affiliated companies	(218)
Other	(8)	(24)
Net cash used in investing activities	(828)	(702)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt		544
Payments for the redemption of long-term debt		(500)
Notes payable to affiliated companies	(131)	53
Distributions to parent		(200)
Net cash provided by financing activities	(131)	(103)
Net increase in cash, cash equivalents and restricted cash	7	(10)
Cash, cash equivalents and restricted cash at beginning of period	7	25
Cash, cash equivalents and restricted cash at end of period	14	15
Significant non-cash transactions:
Accrued capital expenditures	105	73
Piedmont
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	175	155
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	152	135
Equity in (earnings) losses of unconsolidated affiliates	(7)	(7)
Equity component of AFUDC	(19)	(14)
Impairment of assets and other charges	10	7
Deferred income taxes	10	24
Provision for rate refunds	(3)	(27)
(Increase) decrease in
Receivables	151	164
Receivables from affiliated companies	(1)	(1)
Inventory		25
Other current assets	7	(59)
Increase (decrease) in
Accounts payable	(55)	(53)
Accounts payable to affiliated companies	(48)	60
Taxes accrued	17	16
Other current liabilities	(32)	(4)
Other assets	3	(14)
Other liabilities	2	7
Net cash provided by operating activities	362	414
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(628)	(641)
Contributions to equity method investments	(9)
Return of investment capital	1
Other	(23)	(18)
Net cash used in investing activities	(659)	(659)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	347	394
Payments for the redemption of long-term debt	(160)
Notes payable to affiliated companies	(215)	(149)
Capital contributions from parent	325
Net cash provided by financing activities	297	245
Significant non-cash transactions:
Accrued capital expenditures	$ 115	$ 123

XML

Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Millions		Total		Preferred Stock	Common Stockholders' Equity		Additional Paid-in Capital		Retained Earnings		Accumulated Other Comprehensive (Loss) Income, Net (Losses) Gains on Cash Flow Hedges	Accumulated Other Comprehensive (Loss) Income, Net Unrealized (Losses) Gains on Available-for-Sale-Securities	Accumulated Other Comprehensive (Loss) Income, Pension and OPEB Adjustments	Noncontrolling Interests	Duke Energy Carolinas		Duke Energy Carolinas Member's Equity		Duke Energy Carolinas Accumulated Other Comprehensive (Loss) Income, Net (Losses) Gains on Cash Flow Hedges	Progress Energy	Progress Energy Common Stockholders' Equity	Progress Energy Additional Paid-in Capital	Progress Energy Retained Earnings	Progress Energy Accumulated Other Comprehensive (Loss) Income, Net (Losses) Gains on Cash Flow Hedges	Progress Energy Accumulated Other Comprehensive (Loss) Income, Net Unrealized (Losses) Gains on Available-for-Sale-Securities	Progress Energy Accumulated Other Comprehensive (Loss) Income, Pension and OPEB Adjustments	Progress Energy Noncontrolling Interests	Duke Energy Progress	Duke Energy Progress Member's Equity	Duke Energy Florida	Duke Energy Florida Member's Equity	Duke Energy Florida Accumulated Other Comprehensive (Loss) Income, Net Unrealized (Losses) Gains on Available-for-Sale-Securities	Duke Energy Ohio	Duke Energy Ohio Common Stock	Duke Energy Ohio Additional Paid-in Capital	Duke Energy Ohio Retained Earnings	Duke Energy Indiana	Duke Energy Indiana Member's Equity	Piedmont	Piedmont Common Stock	Piedmont Retained Earnings	Common Stock	Common Stock Common Stockholders' Equity	Common Stock Common Stock	Common Stock Additional Paid-in Capital
Beginning Balance at Dec. 31, 2019		$ 47,951		$ 1,962	$ 46,822		$ 40,881		$ 4,108		$ (51)	$ 3	$ (82)	$ 1,129						$ 15,593	$ 15,590	$ 9,143	$ 6,465	$ (10)	$ (1)	$ (7)	$ 3																	$ 1
Beginning Balance, in shares at Dec. 31, 2019																																												733,000,000
Beginning Balance (member's equity) at Dec. 31, 2019															$ 12,811		$ 12,818		$ (7)										$ 9,246	$ 6,788	$ 6,789	$ (1)						$ 4,575
Beginning Balance (parent) at Dec. 31, 2019																																	$ 3,683	$ 762	$ 2,776	$ 145			$ 2,443	$ 1,310	$ 1,133
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		1,139			1,347				1,347					(208)
Net income		1,440													1,128		1,128			1,232								$ 711	711	623	623		201			201	$ 299	299	155		155
Net income		1,232																		1,233	1,232		1,232				1
Other comprehensive (loss) income		(145)	[1]		(133)						(139)	5	1	(12)						5	5			3	1	1				1		1
Common stock issuances, including dividend reinvestment and employee benefits																																										$ 181	$ 181		$ 181
Common stock issuances, including dividend reinvestment and employee benefits (in shares)																																												3,000,000
Common stock dividends		(2,103)			(2,103)				(2,103)						(600)		(600)			(400)	(400)		(400)						(400)									(200)
Contributions from noncontrolling interests, net of transaction costs	[2]	385			(17)		(17)							402
Distributions to noncontrolling interest in subsidiaries		(22)												(22)						(1)							(1)
Other		(91)	[3]		(91)	[3]	1	[3]	(92)	[3]					(13)	[4]	(13)	[4]		(1)	(1)		(1)						(1)	(1)	(1)								(1)		(1)
Ending Balance at Sep. 30, 2020		47,295		1,962	46,006		41,046		3,260		(190)	8	(81)	1,289						16,429	16,426	9,143	7,296	(7)		(6)	3																	$ 1
Ending Balance (member's equity) at Sep. 30, 2020															13,326		13,333		(7)										9,556	7,411	7,411							4,674
Ending Balance, in shares at Sep. 30, 2020																																												736,000,000
Ending Balance (parent) at Sep. 30, 2020																																	3,884	762	2,776	346			2,597	1,310	1,287
Beginning Balance at Jun. 30, 2020		46,611		1,962	45,484		40,997		2,707		(111)	10	(82)	1,127						16,221	16,218	9,143	7,090	(8)	(1)	(6)	3																	$ 1
Beginning Balance, in shares at Jun. 30, 2020																																												735,000,000
Beginning Balance (member's equity) at Jun. 30, 2020															13,072		13,079		(7)										9,610	7,124	7,125	(1)						4,655
Beginning Balance (parent) at Jun. 30, 2020																																	3,814	762	2,776	276			2,622	1,310	1,312
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		1,195			1,265				1,265					(70)
Net income		1,304													555		555			605								346	346	287	287		70			70	119	119	(25)		(25)
Net income		1,234																		606	605		605				1
Other comprehensive (loss) income		(80)	[1]		(80)						(79)	(2)	1							2	2			1	1					1		1
Common stock issuances, including dividend reinvestment and employee benefits																																										65	65		65
Common stock issuances, including dividend reinvestment and employee benefits (in shares)																																												1,000,000
Common stock dividends		(712)			(712)				(712)						(300)		(300)			(400)	(400)		(400)						(400)									(100)
Contributions from noncontrolling interests, net of transaction costs	[2]	222			(17)		(17)							239
Distributions to noncontrolling interest in subsidiaries		(8)												(8)
Other		2			1		1							1	(1)		(1)				1		1				(1)			(1)	(1)
Ending Balance at Sep. 30, 2020		47,295		1,962	46,006		41,046		3,260		(190)	8	(81)	1,289						16,429	16,426	9,143	7,296	(7)		(6)	3																	$ 1
Ending Balance (member's equity) at Sep. 30, 2020															13,326		13,333		(7)										9,556	7,411	7,411							4,674
Ending Balance, in shares at Sep. 30, 2020																																												736,000,000
Ending Balance (parent) at Sep. 30, 2020																																	$ 3,884	762	2,776	346			$ 2,597	1,310	1,287
Beginning Balance at Dec. 31, 2020		$ 49,184		1,962	47,964		43,767		2,471		(167)	6	(76)	1,220						$ 16,241	16,237	9,143	7,109	(5)	(2)	(8)	4																	$ 1
Beginning Balance, in shares at Dec. 31, 2020		769,000,000																		100													90,000,000						100,000,000					769,000,000
Beginning Balance (member's equity) at Dec. 31, 2020															13,154		13,161		(7)									9,260	9,260	7,558	7,560	(2)					4,783	4,783
Beginning Balance (parent) at Dec. 31, 2020		$ 47,964																		$ 16,237													$ 3,935	762	2,776	397			$ 2,715	1,310	1,405
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		2,823			3,070				3,070					(247)
Net income		3,162													1,070		1,070			1,333								800	800	631	631		$ 188			188	396	396	175		175
Net income		2,915																		1,334	1,333		1,333				1
Other comprehensive (loss) income		(53)	[1]		(60)						(57)	(6)	3	7						2	2			2
Common stock issuances, including dividend reinvestment and employee benefits																																										43	43		43
Common stock dividends		(2,248)			(2,248)				(2,248)						(600)		(600)			(700)	(700)		(700)						(700)									(125)
Sale of noncontrolling interest	[5]	999			545		545							454
Contributions from noncontrolling interests, net of transaction costs	[2]	525			(6)		(6)							531
Distributions to noncontrolling interest in subsidiaries		(34)												(34)						(1)							(1)
Other		1			(1)		(1)							2						6	7	6	1				(1)			(1)	(1)							1	(1)		(1)
Contribution from parent																																							$ 325	325
Ending Balance at Sep. 30, 2021		$ 51,240		1,962	49,307		44,348		3,293		(224)		(73)	1,933						$ 16,882	16,879	9,149	7,743	(3)	(2)	(8)	3																	$ 1
Ending Balance (member's equity) at Sep. 30, 2021															13,624		13,631		(7)									9,360	9,360	8,188	8,190	(2)					5,055	5,055
Ending Balance, in shares at Sep. 30, 2021		769,000,000																		100													90,000,000						100,000,000					769,000,000
Ending Balance (parent) at Sep. 30, 2021		$ 49,307																		$ 16,879													$ 4,123	762	2,776	585			$ 3,214	1,635	1,579
Beginning Balance at Jun. 30, 2021		49,545		1,962	48,132		43,788		2,687		(234)	2	(74)	1,413						16,942	16,939	9,143	7,809	(4)	(2)	(7)	3																	$ 1
Beginning Balance, in shares at Jun. 30, 2021																																												769,000,000
Beginning Balance (member's equity) at Jun. 30, 2021															13,392		13,399		(7)										9,685	7,891	7,893	(2)						4,999
Beginning Balance (parent) at Jun. 30, 2021																																	4,065	762	2,776	527			3,239	1,635	1,604
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		1,237			1,366				1,366					(129)
Net income		1,405													533		533			632								375	375	297	297		$ 58			58	181	181	(24)		(24)
Net income		1,276																		633	632		632				1
Other comprehensive (loss) income		10	[1]		9						10	$ (2)	1	1										1		(1)
Common stock issuances, including dividend reinvestment and employee benefits																																										$ 20	$ 20		$ 20
Common stock dividends		(760)			(760)				(760)						(300)		(300)			(700)	(700)		(700)						(700)									(125)
Sale of noncontrolling interest	[5]	999			545		545							454
Contributions from noncontrolling interests, net of transaction costs	[2]	210			(3)		(3)							213
Distributions to noncontrolling interest in subsidiaries		(22)												(22)
Other		1			(2)		(2)							3	(1)		(1)			7	8	6	2				(1)												$ (1)		(1)
Ending Balance at Sep. 30, 2021		$ 51,240		$ 1,962	$ 49,307		$ 44,348		$ 3,293		$ (224)		$ (73)	$ 1,933						$ 16,882	$ 16,879	$ 9,149	$ 7,743	$ (3)	$ (2)	$ (8)	$ 3																	$ 1
Ending Balance (member's equity) at Sep. 30, 2021															$ 13,624		$ 13,631		$ (7)									$ 9,360	$ 9,360	$ 8,188	$ 8,190	$ (2)					$ 5,055	$ 5,055
Ending Balance, in shares at Sep. 30, 2021		769,000,000																		100													90,000,000						100,000,000					769,000,000
Ending Balance (parent) at Sep. 30, 2021		$ 49,307																		$ 16,879													$ 4,123	$ 762	$ 2,776	$ 585			$ 3,214	$ 1,635	$ 1,579

[1] Net of income tax impacts of approximately $24 million for the three months ended September 30, 2020, and $16 million and $43 million for the nine months ended September 30, 2021, and 2020, respectively. All other periods presented include immaterial income tax impacts.

[2] Relates to tax equity financing activity in the Commercial Renewables segment.

[3] Amounts in Retained earnings primarily represent impacts due to implementation of a new accounting standard related to Current Estimated Credit Losses. See Note 1 for additional discussion.

[4] Amounts primarily represent impacts due to implementation of a new accounting standard related to Current Estimated Credit Losses. See Note 1 for additional discussion.

[5] Relates to the sale of a noncontrolling interest in Duke Energy Indiana. See Note 2 for additional discussion.

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Organization and Basis of Presentation

9 Months Ended

Sep. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Basis of Presentation

Index to Combined Notes to Condensed Consolidated Financial Statements

The unaudited notes to the Condensed Consolidated Financial Statements that follow are a combined presentation. The following list indicates the registrants to which the footnotes apply.

Applicable Notes

Registrant

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Duke Energy

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Duke Energy Carolinas

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Progress Energy

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Duke Energy Progress

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Duke Energy Florida

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Duke Energy Ohio

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Duke Energy Indiana

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Piedmont

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Tables within the notes may not sum across due to (i) Progress Energy's consolidation of Duke Energy Progress, Duke Energy Florida and other subsidiaries that are not registrants and (ii) subsidiaries that are not registrants but included in the consolidated Duke Energy balances.

ORGANIZATION AND BASIS OF PRESENTATION

BASIS OF PRESENTATION

These Condensed Consolidated Financial Statements have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Regulation S-X. Accordingly, these Condensed Consolidated Financial Statements do not include all information and notes required by GAAP for annual financial statements and should be read in conjunction with the Consolidated Financial Statements in the Duke Energy Registrants’ combined Annual Report on Form 10-K for the year ended December 31, 2020.

The information in these combined notes relates to each of the Duke Energy Registrants as noted in the Index to Combined Notes to Condensed Consolidated Financial Statements. However, none of the registrants make any representations as to information related solely to Duke Energy or the subsidiaries of Duke Energy other than itself.

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

In preparing financial statements that conform to GAAP, management must make estimates and assumptions that affect the reported amounts of assets and liabilities, the reported amounts of revenues and expenses and the disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates.

BASIS OF CONSOLIDATION

These Condensed Consolidated Financial Statements include, after eliminating intercompany transactions and balances, the accounts of the Duke Energy Registrants and subsidiaries or VIEs where the respective Duke Energy Registrants have control. See Note 11 for additional information on VIEs. These Condensed Consolidated Financial Statements also reflect the Duke Energy Registrants’ proportionate share of certain jointly owned generation and transmission facilities.

OTHER CURRENT LIABILITIES

Included in Other within Current Liabilities on the Duke Energy Condensed Consolidated Balance Sheet is a current liability of $36 million and $936 million as of September 30, 2021, and December 31, 2020, respectively. The current liability, initially recorded in 2020, primarily represented Duke Energy's share of ACP's obligations of outstanding debt and to satisfy ARO requirements to restore construction sites. See Notes 3 and 11 for further information.

NONCONTROLLING INTEREST

Duke Energy maintains a controlling financial interest in certain less than wholly owned nonregulated subsidiaries. As a result, Duke Energy consolidates these subsidiaries and presents the third-party investors' portion of Duke Energy's net income (loss), net assets and comprehensive income (loss) as noncontrolling interest. Noncontrolling interest is included as a component of equity on the Condensed Consolidated Balance Sheet.

Several operating agreements of Duke Energy's subsidiaries with noncontrolling interest are subject to allocations of earnings, tax attributes and cash flows in accordance with contractual agreements that vary throughout the lives of the subsidiaries. Therefore, Duke Energy and the other investors' (the owners) interests in the subsidiaries are not fixed, and the subsidiaries apply the Hypothetical Liquidation at Book Value (HLBV) method in allocating income or loss and other comprehensive income or loss (all measured on a pretax basis) to the owners. The HLBV method measures the amounts that each owner would hypothetically claim at each balance sheet reporting date, including tax benefits realized by the owners over the IRS recapture period, upon a hypothetical liquidation of the subsidiary at the net book value of its underlying assets. The change in the amount that each owner would hypothetically receive at the reporting date compared to the amount it would have received on the previous reporting date represents the amount of income or loss allocated to each owner for the reporting period.

During September 2021, Duke Energy completed the initial minority interest investment in a portion of Duke Energy Indiana to an affiliate of GIC. GIC's ownership interest in Duke Energy Indiana represents a noncontrolling interest. See Note 2 for additional information on the sale.

Other operating agreements of Duke Energy's subsidiaries with noncontrolling interest allocate profit and loss based on their pro rata shares of the ownership interest in the respective subsidiary. Therefore, Duke Energy allocates net income or loss and other comprehensive income or loss of these subsidiaries to the owners based on their pro rata shares.

The following table presents allocated losses to noncontrolling interest for the three and nine months ended September 30, 2021, and 2020.

	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2021		2020		2021		2020
Noncontrolling Interest Allocation of Income
Allocated losses to noncontrolling tax equity members utilizing the HLBV method	$	119	$	59	$	217	$	187
Allocated losses to noncontrolling members based on pro rata shares of ownership	10		11		30		21
Total Noncontrolling Interest Allocated Losses	$	129	$	70	$	247	$	208

CASH, CASH EQUIVALENTS AND RESTRICTED CASH

Duke Energy, Progress Energy and Duke Energy Florida have restricted cash balances related primarily to collateral assets, escrow deposits and VIEs. See Notes 9 and 11 for additional information. Restricted cash amounts are included in Other within Current Assets and Other Noncurrent Assets on the Condensed Consolidated Balance Sheets. The following table presents the components of cash, cash equivalents and restricted cash included in the Condensed Consolidated Balance Sheets.

	September 30, 2021						December 31, 2020
					Duke						Duke
	Duke		Progress		Energy		Duke		Progress		Energy
	Energy		Energy		Florida		Energy		Energy		Florida
Current Assets
Cash and cash equivalents	$	548	$	102	$	40	$	259	$	59	$	11
Other	194		17		17		194		39		39
Other Noncurrent Assets
Other	1		—		—		103		102		—
Total cash, cash equivalents and restricted cash	$	743	$	119	$	57	$	556	$	200	$	50

INVENTORY

Provisions for inventory write-offs were not material at September 30, 2021, and December 31, 2020. The components of inventory are presented in the tables below.

	September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Materials and supplies	$	2,317	$	779	$	1,009	$	674	$	336	$	85	$	305	$	11
Coal	312		152		89		45		43		10		61		—
Natural gas, oil and other fuel	271		38		157		96		60		19		1		57
Total inventory	$	2,900	$	969	$	1,255	$	815	$	439	$	114	$	367	$	68

	December 31, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Materials and supplies	$	2,312	$	785	$	999	$	673	$	325	$	78	$	307	$	12
Coal	561		186		193		131		63		16		165		—
Natural gas, oil and other fuel	294		39		183		107		76		16		1		56
Total inventory	$	3,167	$	1,010	$	1,375	$	911	$	464	$	110	$	473	$	68

PROPERTY, PLANT & EQUIPMENT AND LEASES

Duke Energy continues to execute on its business transformation strategy, including the evaluation of in-office work policies considering the experience with the COVID-19 pandemic and also workforce realignment of roles and responsibilities. In May 2021, Duke Energy management approved the sale of certain properties and entered into an agreement to exit certain leased space on December 31, 2021. The sale of the properties is subject to abandonment accounting and resulted in an impairment charge. Additionally, the exit of the leased space resulted in the impairment of related furniture, fixtures and equipment. The total 2021 charges related to the reduction in physical workspace, including these impairments, are expected to be approximately $200 million. During the three months ended September 30, 2021, Duke Energy recorded a pretax charge to earnings of $9 million on the Condensed Consolidated Statements of Operations, which includes $8 million within Impairment of assets and other charges and $1 million within Operations, maintenance and other. During the nine months ended September 30, 2021, Duke Energy recorded a pretax charge to earnings of $184 million on the Condensed Consolidated Statements of Operations, which includes $139 million within Impairment of assets and other charges, $28 million within Operations, maintenance and other and $17 million within Depreciation and amortization.

NEW ACCOUNTING STANDARDS

The following new accounting standard was adopted by the Duke Energy Registrants in 2021.

Leases with Variable Lease Payments. In July 2021, the Financial Accounting Standards Board (FASB) issued new accounting guidance requiring lessors to classify a lease with variable lease payments that do not depend on a reference index or rate as an operating lease if both of the following are met: (1) the lease would have to be classified as a sales-type or direct financing lease under prior guidance, and (2) the lessor would have recognized a day-one loss. Duke Energy elected to adopt the guidance immediately upon issuance of the new standard and will be applying the new standard prospectively to new lease arrangements meeting the criteria. Duke Energy does not currently have any lease arrangements that this new accounting guidance will materially impact.

The following accounting standard was adopted by the Duke Energy Registrants in 2020.

Current Expected Credit Losses. In June 2016, the FASB issued new accounting guidance for credit losses. Duke Energy adopted the new accounting guidance for credit losses effective January 1, 2020, using the modified retrospective method of adoption, which does not require restatement of prior year results. Duke Energy did not adopt any practical expedients.

Duke Energy recognizes allowances for credit losses based on management's estimate of losses expected to be incurred over the lives of certain assets or guarantees. Management monitors credit quality, changes in expected credit losses and the appropriateness of the allowance for credit losses on a forward-looking basis. Management reviews the risk of loss periodically as part of the existing assessment of collectability of receivables.

Duke Energy reviews the credit quality of its counterparties as part of its regular risk management process and requires credit enhancements, such as deposits or letters of credit, as appropriate and as allowed by regulators.

Duke Energy recorded cumulative effects of changes in accounting principles related to the adoption of the new credit loss standard for allowances for credit losses of trade and other receivables, insurance receivables and financial guarantees. These amounts are included in the Condensed Consolidated Balance Sheets in Receivables, Receivables of VIEs, Other Noncurrent Assets and Other Noncurrent Liabilities. See Notes 4 and 12 for more information.

Duke Energy recorded an adjustment for the cumulative effect of a change in accounting principle due to the adoption of this standard on January 1, 2020, as shown in the table below:

	January 1, 2020
			Duke				Duke		Duke
	Duke		Energy		Progress		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Piedmont
Total pretax impact to Retained Earnings	$	120	$	16	$	2	$	1	$	1	$	1

The following new accounting standard has been issued but not yet adopted by the Duke Energy Registrants as of September 30, 2021.

Reference Rate Reform. In March 2020, the FASB issued new accounting guidance for reference rate reform. This guidance is elective and provides expedients to facilitate financial reporting for the anticipated transition away from the London Inter-bank Offered Rate (LIBOR) and other interbank reference rates by the end of 2022. The optional expedients are effective for modification of existing contracts or new arrangements executed between March 12, 2020, through December 31, 2022.

Duke Energy has variable-rate debt and manages interest rate risk by entering into financial contracts including interest rate swaps that are generally indexed to LIBOR. Impacted financial arrangements extending beyond 2022 may require contractual amendment or termination to fully adapt to a post-LIBOR environment. Duke Energy is assessing these financial arrangements and is evaluating the use of optional expedients outlined in the new accounting guidance. Alternative index provisions are also being assessed and incorporated into new financial arrangements that extend beyond 2022. The full outcome of the transition away from LIBOR cannot be determined at this time, but is not expected to have a material impact on the financial statements.

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Business Segments

9 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Business Segments

BUSINESS SEGMENTS

Duke Energy

Duke Energy's segment structure includes the following segments: Electric Utilities and Infrastructure, Gas Utilities and Infrastructure and Commercial Renewables.

The Electric Utilities and Infrastructure segment primarily includes Duke Energy's regulated electric utilities in the Carolinas, Florida and the Midwest. On January 28, 2021, Duke Energy executed an agreement providing for an investment by an affiliate of GIC in Duke Energy Indiana in exchange for a 19.9% minority interest issued by Duke Energy Indiana Holdco, LLC, the holding company for Duke Energy Indiana. The transaction will be completed following two closings for an aggregate purchase price of approximately $2 billion. The first closing, which occurred on September 8, 2021, resulted in Duke Energy Indiana Holdco, LLC issuing 11.05% of its membership interests in exchange for approximately $1,025 million or 50% of the purchase price. Duke Energy retained indirect control of these assets, and, therefore, no gain or loss was recognized on the Condensed Consolidated Statements of Operations. The difference between the cash consideration received, net of transaction costs of approximately $27 million, and the carrying value of the noncontrolling interest is $545 million and was recorded as an increase to equity.

The Gas Utilities and Infrastructure segment includes Piedmont, Duke Energy's natural gas local distribution companies in Ohio and Kentucky and Duke Energy's natural gas storage, midstream pipeline and renewable natural gas investments.

The Commercial Renewables segment is primarily comprised of nonregulated utility-scale wind and solar generation assets located throughout the U.S. In 2021, Duke Energy continues to monitor recoverability of its renewable merchant plants located in the Electric Reliability Council of Texas West market and in the PJM West market due to fluctuating market pricing and long-term forecasted energy prices. The assets were not impaired as of September 30, 2021, because the carrying value of approximately $206 million continues to approximate the aggregate estimated future undiscounted cash flows. Duke Energy has a 50% ownership interest in these assets. A continued decline in energy market pricing or other factors unfavorably impacting the economics would likely result in a future impairment.

The remainder of Duke Energy’s operations is presented as Other, which is primarily comprised of interest expense on holding company debt, unallocated corporate costs, Duke Energy’s wholly owned captive insurance company, Bison, and Duke Energy's ownership interest in National Methanol Company.

Business segment information is presented in the following tables. Segment assets presented exclude intercompany assets.

	Three Months Ended September 30, 2021
	Electric		Gas				Total
	Utilities and		Utilities and		Commercial		Reportable
(in millions)	Infrastructure		Infrastructure		Renewables		Segments		Other		Eliminations		Total
Unaffiliated revenues	$	6,560	$	266	$	117	$	6,943	$	8	$	—	$	6,951
Intersegment revenues	9		23		—		32		20		(52)		—
Total revenues	$	6,569	$	289	$	117	$	6,975	$	28	$	(52)	$	6,951
Segment income (loss)(a)	$	1,425	$	(3)	$	78	$	1,500	$	(134)	$	—	$	1,366
Less: Noncontrolling interests													129
Add: Preferred stock dividend													39
Net Income													$	1,276
Segment assets	$	141,565	$	14,692	$	7,037	$	163,294	$	3,717	$	(4)	$	167,007

	Three Months Ended September 30, 2020
	Electric		Gas				Total
	Utilities and		Utilities and		Commercial		Reportable
(in millions)	Infrastructure		Infrastructure		Renewables		Segments		Other		Eliminations		Total
Unaffiliated revenues	$	6,371	$	217	$	126	$	6,714	$	7	$	—	$	6,721
Intersegment revenues	8		24		—		32		17		(49)		—
Total revenues	$	6,379	$	241	$	126	$	6,746	$	24	$	(49)	$	6,721
Segment income (loss)(b)	$	1,381	$	(73)	$	60	$	1,368	$	(103)	$	—	$	1,265
Less: Noncontrolling interests													70
Add: Preferred stock dividend													39
Net Income													$	1,234

(a)Gas Utilities and Infrastructure includes $3 million, recorded within Equity in earnings (losses) of unconsolidated affiliates on the Condensed Consolidated Statements of Operations, related to gas pipeline investments. See Note 3 for additional information. Other includes $8 million recorded within Impairment of assets and other charges, $1 million within Operations, maintenance and other on the Condensed Consolidated Statements of Operations, related to the workplace and workforce realignment. See Note 1 for additional information. Electric Utilities and Infrastructure includes $160 million recorded within Impairment of assets and other charges, $77 million within Other Income and expenses, $5 million within Operations, maintenance and other, $13 million within Regulated electric operating revenues and $3 million within Interest expense on the Duke Energy Carolinas' Condensed Consolidated Statement of Operations related to the 2018 South Carolina rate cases and the CCR settlement and insurance proceeds distributed in accordance with that agreement; it also includes $42 million recorded within Impairment of assets and other charges, $34 million within Other Income and expenses, $7 million within Operations, maintenance, and other, $15 million within Regulated electric operating revenues and $5 million within Interest expense on the Duke Energy Progress' Condensed Consolidated Statement of Operations. See Notes 3 and 4 for more information.

(b)Electric Utilities and Infrastructure includes $19 million recorded within Impairment charges and $8 million recorded within Operations, maintenance and other on the Duke Energy Carolinas' Condensed Consolidated Statements of Operations related to a partial settlement in the Duke Energy Carolinas' 2019 North Carolina rate case and $8 million recorded within Operations, maintenance and other on Duke Energy Progress' Condensed Consolidated Statements of Operation related to a partial settlement in the Duke Energy Progress' 2019 North Carolina rate case. See Note 3 for more information. Additionally, Electric Utilities and Infrastructure includes $5 million of Impairment charges related to gas pipeline assets recorded on Duke Energy Progress' Condensed Consolidated Statement of Operations. Gas Utilities and Infrastructure includes $78 million recorded within Equity in earnings (losses) of unconsolidated affiliates on the Condensed Consolidated Statements of Operations and $7 million in Impairment charges recorded on the Piedmont Condensed Consolidated Statements of Operations related to gas pipeline investments.

	Nine Months Ended September 30, 2021
	Electric		Gas				Total
	Utilities and		Utilities and		Commercial		Reportable
(in millions)	Infrastructure		Infrastructure		Renewables		Segments		Other		Eliminations		Total
Unaffiliated revenues	$	17,161	$	1,323	$	355	$	18,839	$	20	$	—	$	18,859
Intersegment revenues	24		68		—		92		61		(153)		—
Total revenues	$	17,185	$	1,391	$	355	$	18,931	$	81	$	(153)	$	18,859
Segment income (loss)(a)	$	3,180	$	259	$	152	$	3,591	$	(521)	$	—	$	3,070
Less: Noncontrolling interests													247
Add: Preferred stock dividend													92
Net Income													$	2,915

	Nine Months Ended September 30, 2020
	Electric		Gas				Total
	Utilities and		Utilities and		Commercial		Reportable
(in millions)	Infrastructure		Infrastructure		Renewables		Segments		Other		Eliminations		Total
Unaffiliated revenues	$	16,571	$	1,122	$	378	$	18,071	$	20	$	—	$	18,091
Intersegment revenues	25		72		—		97		53		(150)		—
Total revenues	$	16,596	$	1,194	$	378	$	18,168	$	73	$	(150)	$	18,091
Segment income (loss)(b)	$	2,839	$	(1,400)	$	207	$	1,646	$	(299)	$	—	$	1,347
Less: Noncontrolling interests													208
Add: Preferred stock dividend													93
Net Income													$	1,232

(a)Gas Utilities and Infrastructure includes $19 million, recorded within Equity in earnings (losses) of unconsolidated affiliates on the Condensed Consolidated Statements of Operations, related to gas pipeline investments. See Note 3 for additional information. Commercial Renewables includes a $35 million loss related to Texas Storm Uri, of which ($8 million) is recorded within Nonregulated electric and other revenues, $2 million within Operations, maintenance and other, $29 million within Equity in earnings (losses) of unconsolidated affiliates and $12 million within Loss Attributable to Noncontrolling Interests on the Condensed Consolidated Statements of Operations. See Note 4 for additional information. Other includes $139 million recorded within Impairment of assets and other charges, $28 million within Operations, maintenance and other, and $17 million within Depreciation and amortization on the Condensed Consolidated Statements of Operations, related to the workplace and workplace realignment. See Note 1 for additional information. Electric Utilities and Infrastructure includes $160 million recorded within Impairment of assets and other charges, $77 million within Other Income and expenses, $5 million within Operations, maintenance and other, $13 million within regulated operating revenues and $3 million within interest expense on the Duke Energy Carolinas' Condensed Consolidated Statement of Operations related to the 2018 South Carolina rate cases and the CCR settlement and insurance proceeds distributed in accordance with that agreement; it also includes $42 million recorded within Impairment of assets and other charges, $34 million within Other Income and expenses, $7 million within Operations, maintenance, and other, $15 million within Regulated electric operating revenues and $5 million within interest expense on the Duke Energy Progress' Condensed Consolidated Statement of Operations. See Notes 3 and 4 for more information.

(b)Gas Utilities and Infrastructure includes $2 billion recorded within Equity in earnings (losses) of unconsolidated affiliates on the Condensed Consolidated Statements of Operations, related to gas pipeline investments. See Note 3 for additional information. Other includes a $98 million reversal, included in Operations, maintenance and other on the Condensed Consolidated Statements of Operations, of 2018 severance costs due to a partial settlement in the Duke Energy Carolinas' 2019 North Carolina rate case. See Note 3 for additional information. Electric Utilities and Infrastructure includes $19 million recorded within Impairment charges and $8 million recorded within Operations, maintenance and other on the Duke Energy Carolinas' Condensed Consolidated Statements of Operations related to a partial settlement in the Duke Energy Carolinas' 2019 North Carolina rate case and $8 million recorded within Operations, maintenance and other on Duke Energy Progress' Condensed Consolidated Statements of Operation related to a partial settlement in the Duke Energy Progress' 2019 North Carolina rate case. See Note 3 for more information. Additionally, Electric Utilities and Infrastructure includes $5 million of Impairment charges related to gas pipeline assets recorded on Duke Energy Progress' Condensed Consolidated Statement of Operations in the prior year.

Duke Energy Ohio

Duke Energy Ohio has two reportable segments, Electric Utilities and Infrastructure and Gas Utilities and Infrastructure. The remainder of Duke Energy Ohio's operations is presented as Other.

	Three Months Ended September 30, 2021
	Electric		Gas		Total
	Utilities and		Utilities and		Reportable
(in millions)	Infrastructure		Infrastructure		Segments		Other		Eliminations		Total
Total revenues	$	413	$	93	$	506	$	—	$	—	$	506
Segment income/Net (loss) income	$	48	$	11	$	59	$	(1)	$	—	$	58
Segment assets	$	6,716	$	3,783	$	10,499	$	27	$	(21)	$	10,505

	Three Months Ended September 30, 2020
	Electric		Gas		Total
	Utilities and		Utilities and		Reportable
(in millions)	Infrastructure		Infrastructure		Segments		Other		Total
Total revenues	$	394	$	79	$	473	$	—	$	473
Segment income/Net (loss) income	$	63	$	9	$	72	$	(2)	$	70

	Nine Months Ended September 30, 2021
	Electric		Gas		Total
	Utilities and		Utilities and		Reportable
(in millions)	Infrastructure		Infrastructure		Segments		Other		Total
Total revenues	$	1,119	$	375	$	1,494	$	—	$	1,494
Segment income/Net (loss) income	$	122	$	77	$	199	$	(11)	$	188

	Nine Months Ended September 30, 2020
	Electric		Gas		Total
	Utilities and		Utilities and		Reportable
(in millions)	Infrastructure		Infrastructure		Segments		Other		Total
Total revenues	$	1,070	$	324	$	1,394	$	—	$	1,394
Segment income/Net (loss) income	$	137	$	68	$	205	$	(4)	$	201

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Regulatory Matters

9 Months Ended

Sep. 30, 2021

Regulated Operations [Abstract]

Regulatory Matters

REGULATORY MATTERS

RATE-RELATED INFORMATION

The NCUC, PSCSC, FPSC, IURC, PUCO, TPUC and KPSC approve rates for retail electric and natural gas services within their states. The FERC approves rates for electric sales to wholesale customers served under cost-based rates (excluding Ohio and Indiana), as well as sales of transmission service. The FERC also regulates certification and siting of new interstate natural gas pipeline projects.

Duke Energy Carolinas and Duke Energy Progress

2021 Coal Ash Settlement

On January 22, 2021, Duke Energy Carolinas and Duke Energy Progress entered into the Coal Combustion Residuals Settlement Agreement (the “CCR Settlement Agreement”) with the North Carolina Public Staff (Public Staff), the North Carolina Attorney General’s Office and the Sierra Club (collectively, the "Settling Parties"), which was filed with the NCUC on January 25, 2021. The CCR Settlement Agreement resolves all coal ash prudence and cost recovery issues in connection with 2019 rate cases filed by Duke Energy Carolinas and Duke Energy Progress with the NCUC, as well as the equitable sharing issue on remand from the 2017 Duke Energy Carolinas and Duke Energy Progress North Carolina rate cases as a result of the December 11, 2020 North Carolina Supreme Court opinion. The settlement also provides clarity on coal ash cost recovery in North Carolina for Duke Energy Carolinas and Duke Energy Progress through January 2030 and February 2030 (the "Term"), respectively.

Duke Energy Carolinas and Duke Energy Progress agreed not to seek recovery of approximately $1 billion of systemwide deferred coal ash expenditures, but will retain the ability to earn a debt and equity return during the amortization period, which shall be five years under the 2019 North Carolina rate cases and will be set by the NCUC in future rate case proceedings. The equity return and the amortization period on deferred coal ash costs under the 2017 Duke Energy Carolinas and Duke Energy Progress North Carolina rate cases will remain unaffected. The equity return on deferred coal ash costs under the 2019 North Carolina rate cases and future rate cases in North Carolina will be set at 150 basis points lower than the authorized return on equity (ROE) then in effect, with a capital structure composed of 48% debt and 52% equity. Duke Energy Carolinas and Duke Energy Progress retain the ability to earn a full WACC return during the deferral period, which is the period from when costs are incurred until they are recovered in rates.

The Settling Parties agreed that execution by Duke Energy Carolinas and Duke Energy Progress of a settlement agreement between themselves and the NCDEQ dated December 31, 2019, (the “DEQ Settlement”) and the coal ash management plans included therein or subsequently approved by DEQ are reasonable and prudent. The Settling Parties retain the right to challenge the reasonableness and prudence of actions taken by Duke Energy Carolinas and Duke Energy Progress and costs incurred to implement the scope of work agreed upon in the DEQ Settlement, after February 1, 2020, and March 1, 2020, for Duke Energy Carolinas and Duke Energy Progress, respectively. The Settling Parties further agreed to waive rights through the Term to challenge the reasonableness or prudence of Duke Energy Carolinas’ and Duke Energy Progress’ historical coal ash management practices, and to waive the right to assert any arguments that future coal ash costs, including financing costs, shall be shared between either company and customers through equitable sharing or any other rate base or return adjustment that shares the revenue requirement burden of coal ash costs not otherwise disallowed due to imprudence.

The Settling Parties agreed to a sharing arrangement for future coal ash insurance litigation proceeds between Duke Energy Carolinas and Duke Energy Progress and North Carolina customers. For more information, see Note 4 "Commitments and Contingencies."

As a result of the CCR Settlement Agreement, Duke Energy Carolinas and Duke Energy Progress recorded a pretax charge of approximately $454 million and $494 million, respectively, in the fourth quarter of 2020 to Impairment charges and a reversal of approximately $50 million and $102 million, respectively, to Regulated electric operating revenues on the respective Consolidated Statements of Operations.

The Coal Ash Settlement was approved without modification in the NCUC Orders in the 2019 rate cases on March 31, 2021, and April 16, 2021, for Duke Energy Carolinas and Duke Energy Progress, respectively. The NCUC issued an Order on Remand Accepting CCR Settlement and Affirming Previous Orders Setting Rates and Imposing Penalties in the 2017 rate cases on June 25, 2021.

2020 North Carolina Storm Securitization Filings

On October 26, 2020, Duke Energy Carolinas and Duke Energy Progress filed a joint petition with the NCUC, as agreed to in partial settlements reached in the 2019 North Carolina Rate Cases for Duke Energy Carolinas and Duke Energy Progress, seeking authorization for the financing of the costs of each utility's storm recovery activities required as a result of Hurricane Florence, Hurricane Michael, Hurricane Dorian and Winter Storm Diego. Specifically, Duke Energy Carolinas and Duke Energy Progress requested that the NCUC find that their storm recovery costs and related financing costs are appropriately financed by debt secured by storm recovery property, and that the commission issue financing orders by which each utility may accomplish such financing using a securitization structure. On January 27, 2021, Duke Energy Carolinas, Duke Energy Progress and the Public Staff filed an Agreement and Stipulation of Partial Settlement, subject to review and approval of the NCUC, resolving certain accounting issues, including agreement to support an 18- to 20-year bond period. The total revenue requirement over a proposed 20-year bond period for the storm recovery charges is approximately $287 million for Duke Energy Carolinas and $920 million for Duke Energy Progress and will be finalized upon issuance of the bonds. A remote evidentiary hearing ended on January 29, 2021. In the NCUC Orders in the 2019 rate cases issued on March 31, 2021, and April 16, 2021, for Duke Energy Carolinas and Duke Energy Progress, respectively, the reasonableness and prudence of the deferred storm costs was approved. On May 10, 2021, the NCUC issued financing orders authorizing the companies to issue storm recovery bonds, subject to the terms of the financing orders, and approving the Agreement and Stipulation of Partial Settlement in its entirety. Duke Energy Carolinas and Duke Energy Progress are currently in the process of structuring and marketing the bonds that will be presented to the market. Duke Energy Carolinas and Duke Energy Progress cannot predict the outcome of this matter.

COVID-19 Filings

North Carolina

Duke Energy Carolinas and Duke Energy Progress filed a joint petition on August 7, 2020, with the NCUC for deferral treatment of incremental costs and the cost of waived customer fees due to the COVID-19 pandemic. Comments on the joint petition were filed on November 5, 2020, and reply comments were filed on November 30, 2020. A summary of incremental COVID-19 costs incurred as of June 30, 2021, was filed with the NCUC by Duke Energy Carolinas and Duke Energy Progress on August 6, 2021. Duke Energy Carolinas and Duke Energy Progress cannot predict the outcome of this matter.

South Carolina

Duke Energy Carolinas and Duke Energy Progress filed a report on June 30, 2020, as required by PSCSC order, reporting revenue impact, costs and savings related to COVID-19 to date. On August 14, 2020, Duke Energy Carolinas and Duke Energy Progress filed a joint petition with the PSCSC for approval of an accounting order to defer incremental COVID-19 related costs incurred through June 30, 2020, and for the ongoing months during the duration of the COVID-19 pandemic. Duke Energy Carolinas and Duke Energy Progress withdrew their joint petition on May 17, 2021.

Duke Energy Carolinas

2017 North Carolina Rate Case

On August 25, 2017, Duke Energy Carolinas filed an application with the NCUC for a rate increase for retail customers of approximately $647 million. On February 28, 2018, Duke Energy Carolinas and the Public Staff filed an Agreement and Stipulation of Partial Settlement resolving certain portions of the proceeding. Terms of the settlement included an ROE of 9.9% and a capital structure of 52% equity and 48% debt. On June 22, 2018, the NCUC issued an order approving the Stipulation of Partial Settlement and requiring a revenue reduction.

The North Carolina Attorney General and other parties separately filed Notices of Appeal to the North Carolina Supreme Court. The North Carolina Supreme Court consolidated the Duke Energy Carolinas and Duke Energy Progress appeals. On December 11, 2020, the North Carolina Supreme Court issued an opinion, which affirmed, in part, and reversed and remanded, in part, the NCUC’s decisions. In the Opinion, the court upheld the NCUC's decision to include coal ash costs in the cost of service, as well as the NCUC’s discretion to allow a return on the unamortized balance of coal ash costs. The court also remanded to the NCUC a single issue to consider the assessment of support for the Public Staff’s equitable sharing argument. On January 22, 2021, Duke Energy Carolinas and Duke Energy Progress entered into the CCR Settlement Agreement with the Settling Parties, which was filed with the NCUC on January 25, 2021, and approved by the NCUC on March 31, 2021. The NCUC issued an Order on Remand Accepting CCR Settlement and Affirming Previous Orders Setting Rates and Imposing Penalties on June 25, 2021.

2019 North Carolina Rate Case

On September 30, 2019, Duke Energy Carolinas filed an application with the NCUC for a net rate increase for retail customers of approximately $291 million, which represented an approximate 6% increase in annual base revenues. The gross rate case revenue increase request was $445 million, which was offset by an EDIT rider of $154 million to return to customers North Carolina and federal EDIT resulting from recent reductions in corporate tax rates. The request for a rate increase was driven by major capital investments subsequent to the previous base rate case, coal ash pond closure costs, accelerated coal plant depreciation and deferred 2018 storm costs. Duke Energy Carolinas requested rates be effective no later than August 1, 2020.

On March 25, 2020, Duke Energy Carolinas and the Public Staff filed an Agreement and Stipulation of Partial Settlement, subject to review and approval of the NCUC, resolving certain issues in the base rate proceeding. On July 24, 2020, Duke Energy Carolinas filed its request for approval of its notice to customers required to implement temporary rates. On July 27, 2020, Duke Energy Carolinas filed a joint motion with Duke Energy Progress and the Public Staff notifying the commission that the parties reached a joint partial settlement with the Public Staff. Also on July 27, 2020, Duke Energy Carolinas filed a letter stating that it intended to update its temporary rates calculation to reflect the terms of the partial settlement. On July 31, 2020, Duke Energy Carolinas and the Public Staff filed a Second Agreement and Stipulation of Partial Settlement (Second Partial Settlement), subject to review and approval of the NCUC, resolving certain remaining issues in the base rate proceeding. The remaining items litigated at hearing included recovery of deferred coal ash compliance costs that are subject to asset retirement obligation accounting, implementation of new depreciation rates and the amortization period of the loss on the hydro station sale.

On August 4, 2020, Duke Energy Carolinas filed an amended motion for approval of its amended notice to customers, seeking to exercise its statutory right to implement temporary rates subject to refund on or after August 24, 2020. The revenue requirement to be recovered, subject to refund, through the temporary rates was based on and consistent with the base rate component of the Second Partial Settlement and excluded the items to be litigated noted above. The NCUC approved the August 4, 2020 amended temporary rates motion on August 6, 2020, and temporary rates went into effect on August 24, 2020.

The Duke Energy Carolinas evidentiary hearing concluded on September 18, 2020, and post-hearing filings were made with the NCUC from all parties by November 4, 2020. On January 22, 2021, Duke Energy Carolinas and Duke Energy Progress entered into the CCR Settlement Agreement with the Settling Parties, which was filed with the NCUC on January 25, 2021.

On March 31, 2021, the NCUC issued an order approving the March 25, 2020, and July 31, 2020, partial settlements. The order includes approval of 1) an ROE of 9.6% based upon a capital structure of 52% equity and 48% debt; 2) deferral treatment of approximately $800 million of grid improvement projects with a return; 3) a flow back period of five years for unprotected federal EDIT; and 4) the reasonableness and prudence of $213 million of deferred storm costs, which were removed from the rate case and for which Duke Energy Carolinas filed a petition seeking securitization in October 2020. Additionally, the order approved without modification the CCR Settlement Agreement.

The order denied Duke Energy Carolinas' proposal to shorten the remaining depreciable lives of certain Duke Energy Carolinas coal-fired generating units, indicating the NCUC has not had the chance to fully examine the issue within the context of an integrated resource planning (IRP) proceeding, and upon retirement the remaining net book value of these units should be placed in a regulatory asset account to be amortized over an appropriate period to be determined in a future rate case.

On May 21, 2021, the NCUC issued an Order Approving Rate Schedules, which resulted in a net increase of approximately $33 million. Revised customer rates became effective on June 1, 2021. The deadline to appeal has passed and no parties appealed the NCUC's order.

2018 South Carolina Rate Case

On November 8, 2018, Duke Energy Carolinas filed an application with the PSCSC for a rate increase for retail customers of approximately $168 million.

After hearings in March 2019, the PSCSC issued an order on May 21, 2019, which included an ROE of 9.5% and a capital structure of 53% equity and 47% debt. The order also included the following material components:

•Approval of cancellation of the Lee Nuclear Project, with Duke Energy Carolinas maintaining the Combined Operating License;

•Approval of recovery of $125 million (South Carolina retail portion) of Lee Nuclear Project development costs (including AFUDC through December 2017) over a 12-year period, but denial of a return on the deferred balance of costs;

•Approval of recovery of $96 million of coal ash costs over a five-year period with a return at Duke Energy Carolinas' WACC;

•Denial of recovery of $115 million of certain coal ash costs deemed to be related to the Coal Ash Act and incremental to the federal CCR rule;

•Approval of a $66 million decrease to base rates to reflect the change in ongoing tax expense, primarily the reduction in the federal income tax rate from 35% to 21%;

•Approval of a $45 million decrease through the EDIT Rider to return EDIT resulting from the federal tax rate change and deferred revenues since January 2018 related to the change, to be returned in accordance with the Average Rate Assumption Method (ARAM) for protected EDIT, over a 20-year period for unprotected EDIT associated with Property, Plant and Equipment, over a five-year period for unprotected EDIT not associated with Property, Plant and Equipment and over a five-year period for the deferred revenues; and

•Approval of a $17 million decrease through the EDIT Rider related to reductions in the North Carolina state income tax rate from 6.9% to 2.5% to be returned over a five-year period.

As a result of the order, revised customer rates were effective June 1, 2019. On May 31, 2019, Duke Energy Carolinas filed a Petition for Rehearing or Reconsideration of that order contending substantial rights of Duke Energy Carolinas were prejudiced by unlawful, arbitrary and capricious rulings by the PSCSC on certain issues presented in the proceeding. On June 19, 2019, the PSCSC issued a Directive denying Duke Energy Carolinas' request to rehear or reconsider the commission's rulings on certain issues presented in the proceeding including coal ash remediation and disposal costs, ROE and the recovery of a return on deferred operation and maintenance expenses. An order detailing the commission's decision in the Directive was issued on October 18, 2019. Duke Energy Carolinas filed a notice of appeal on November 15, 2019, with the Supreme Court of South Carolina. On November 20, 2019, the South Carolina Energy Users Committee filed a Notice of Appeal with the Supreme Court of South Carolina. Initial briefs were filed on April 21, 2020, which included the South Carolina Energy User's Committee brief arguing that the PSCSC erred in allowing Duke Energy Carolinas' recovery of costs related to the Lee Nuclear Station. Response briefs were filed on July 6, 2020, and reply briefs were filed on August 11, 2020. Oral arguments were heard before the Supreme Court of South Carolina on May 26, 2021.

On October 27, 2021, the Supreme Court of South Carolina affirmed the PSCSC's May 2019 order to:

•Disallow cost recovery on certain CCR compliance costs the PSCSC deemed to be incremental to the federal CCR rules;

•Disallow recovery of certain coal ash litigation expenses;

•Disallow a return on certain deferred expenses; and

•Allow recovery of Lee Nuclear Project preconstruction costs.

The Supreme Court's decision notes the prior determination made by the PSCSC that Duke Energy could submit coal ash costs for recovery that were not initially approved in the rate case order if such costs can be attributed to the CCR rules. As a result of the Court's opinion, Duke Energy Carolinas recognized a pretax charge of approximately $160 million to Impairment of assets and other charges, and a $31 million increase in Other income and expenses, net, in the Condensed Consolidated Statement of Operations for the three and nine months ended September 30, 2021, principally related to coal ash remediation at retired coal ash basin sites. Duke Energy Carolinas is evaluating whether to file a Petition for rehearing on the Supreme Court's decision. Petitions are due November 11, 2021, unless an extension is sought and granted.

Oconee Nuclear Station Subsequent License Renewal

On June 7, 2021, Duke Energy Carolinas filed a subsequent license renewal application for the Oconee Nuclear Station (ONS) with the U.S. Nuclear Regulatory Commission (NRC) to renew ONS’s operating license for an additional 20 years. The subsequent license renewal would extend operations of the facility from 60 to 80 years. The current license for units 1 and 2 expire in 2033 and the license for unit 3 expires in 2034. By a Federal Register Notice dated July 28, 2021, the NRC provided a 60-day comment period for persons whose interest may be affected by the issuance of a subsequent renewed license for ONS to file a request for a hearing and a petition for leave to intervene. On September 27, 2021, Beyond Nuclear and Sierra Club (Petitioners) filed a Hearing Request and Petition to Intervene (Hearing Request) and a Petition for Waiver. The Hearing Request proposes three contentions purporting to challenge Duke Energy Carolinas’ environmental report (ER). In general, the proposed contentions claim that the ER does not consider certain information regarding the environmental aspects of Severe Accidents caused by a hypothetical failure of the Jocassee Dam, and therefore does not satisfy the National Environmental Policy Act of 1969, as amended (NEPA), or the NRC’s NEPA-implementing regulations. Duke Energy Carolinas filed its answer to the proposed contentions on October 22, 2021, and the Petitioners have until November 5, 2021, to respond to Duke Energy Carolina’s answer.

Duke Energy Carolinas and Duke Energy Progress intend to seek renewal of operating licenses and 20-year license extensions for all of their nuclear stations. New depreciation rates were implemented for all of the nuclear facilities during the second quarter of 2021. Duke Energy Carolinas and Duke Energy Progress cannot predict the outcome of this matter.

Duke Energy Progress

2017 North Carolina Rate Case

On June 1, 2017, Duke Energy Progress filed an application with the NCUC for a rate increase for retail customers of approximately $477 million, which was subsequently adjusted to $420 million. On November 22, 2017, Duke Energy Progress and the Public Staff filed an Agreement and Stipulation of Partial Settlement resolving certain portions of the proceeding. Terms of the settlement included an ROE of 9.9% and a capital structure of 52% equity and 48% debt. On February 23, 2018, the NCUC issued an order approving the stipulation. The Public Staff, the North Carolina Attorney General and the Sierra Club filed notices of appeal to the North Carolina Supreme Court.

The North Carolina Supreme Court consolidated the Duke Energy Carolinas and Duke Energy Progress appeals. On December 11, 2020, the North Carolina Supreme Court issued an opinion, which affirmed, in part, and reversed and remanded, in part, the NCUC’s decisions. In the Opinion, the court upheld the NCUC's decision to include coal ash costs in the cost of service, as well as the NCUC’s discretion to allow a return on the unamortized balance of coal ash costs. The court also remanded to the NCUC a single issue to consider the assessment of support for the Public Staff’s equitable sharing argument. On January 22, 2021, Duke Energy Progress and Duke Energy Carolinas entered into the CCR Settlement Agreement with the Settling Parties, which was filed with the NCUC on January 25, 2021, and approved by the NCUC on April 16, 2021. The NCUC issued an Order on Remand Accepting CCR Settlement and Affirming Previous Orders Setting Rates and Imposing Penalties on June 25, 2021.

2019 North Carolina Rate Case

On October 30, 2019, Duke Energy Progress filed an application with the NCUC for a net rate increase for retail customers of approximately $464 million, which represented an approximate 12.3% increase in annual base revenues. The gross rate case revenue increase request was $586 million, which was offset by riders of $122 million, primarily an EDIT rider of $120 million to return to customers North Carolina and federal EDIT resulting from recent reductions in corporate tax rates. The request for a rate increase was driven by major capital investments subsequent to the previous base rate case, coal ash pond closure costs, accelerated coal plant depreciation and deferred 2018 storm costs. Duke Energy Progress sought to defer and recover incremental Hurricane Dorian storm costs in this proceeding and requested rates be effective no later than September 1, 2020. As a result of the COVID-19 pandemic, on March 24, 2020, the NCUC suspended the procedural schedule and postponed the previously scheduled evidentiary hearing on this matter indefinitely.

On June 2, 2020, Duke Energy Progress and the Public Staff filed an Agreement and Stipulation of Partial Settlement, subject to review and approval of the NCUC, resolving certain issues in the base rate proceeding. On July 27, 2020, Duke Energy Progress filed a joint motion with Duke Energy Carolinas and the Public Staff notifying the commission that the parties reached a joint partial settlement with the Public Staff. On July 31, 2020, Duke Energy Progress and the Public Staff filed a Second Agreement and Stipulation of Partial Settlement, subject to review and approval of the NCUC, resolving certain remaining issues in the base rate proceeding. The remaining items litigated at hearing included recovery of deferred coal ash compliance costs that are subject to asset retirement obligation accounting and implementation of new depreciation rates.

On August 7, 2020, Duke Energy Progress filed a motion for approval of notice required to implement temporary rates, seeking to exercise its statutory right to implement temporary rates subject to refund on or after September 1, 2020. The revenue requirement to be recovered subject to refund through the temporary rates was based on and consistent with the terms of the base rate component of the settlement agreements with the Public Staff and excluded items to be litigated noted above. In addition, Duke Energy Progress also sought authorization to place a temporary decrement EDIT Rider into effect, concurrent with the temporary base rate change. The NCUC approved the August 7, 2020 temporary rates motion on August 11, 2020, and temporary rates went into effect on September 1, 2020.

The Duke Energy Progress evidentiary hearing concluded on October 6, 2020, and post-hearing filings were filed with the NCUC from all parties by December 4, 2020. On January 22, 2021, Duke Energy Progress and Duke Energy Carolinas entered into the CCR Settlement Agreement with the Settling Parties, which was filed with the NCUC on January 25, 2021.

On April 16, 2021, the NCUC issued an order approving the June 2, 2020, and July 31, 2020, partial settlements. The order includes approval of 1) an ROE of 9.6% based upon a capital structure of 52% equity and 48% debt; 2) deferral treatment of approximately $400 million of grid improvement projects with a return; 3) a flow back period of five years for unprotected federal EDIT; and 4) the reasonableness and prudence of approximately $714 million of deferred storm costs, which were removed from the rate case and for which Duke Energy Progress filed a petition seeking securitization in October 2020. Additionally, the order approved without modification the CCR Settlement Agreement.

The order denied Duke Energy Progress' proposal to shorten the remaining depreciable lives of certain Duke Energy Progress coal-fired generating units, indicating the NCUC has not had the chance to fully examine the issue within the context of an IRP proceeding, and upon retirement the remaining net book value of these units should be placed in a regulatory asset account to be amortized over an appropriate period to be determined in a future rate case.

On May 21, 2021, the NCUC issued an Order Approving Rate Schedules, which resulted in a net increase of approximately $178 million. Revised customer rates became effective on June 1, 2021. The deadline to appeal has passed and no parties appealed the NCUC's order.

2018 South Carolina Rate Case

On November 8, 2018, Duke Energy Progress filed an application with the PSCSC for a rate increase for retail customers of approximately $59 million.

After hearings in April 2019, the PSCSC issued an order on May 21, 2019, which included an ROE of 9.5% and a capital structure of 53% equity and 47% debt. The order also included the following material components:

•Approval of recovery of $4 million of coal ash costs over a five-year period with a return at Duke Energy Progress' WACC;

•Denial of recovery of $65 million of certain coal ash costs deemed to be related to the Coal Ash Act and incremental to the federal CCR rule;

•Approval of a $17 million decrease to base rates to reflect the change in ongoing tax expense, primarily the reduction in the federal income tax rate from 35% to 21%;

•Approval of a $12 million decrease through the EDIT Tax Savings Rider resulting from the federal tax rate change and deferred revenues since January 2018 related to the change, to be returned in accordance with ARAM for protected EDIT, over a 20-year period for unprotected EDIT associated with Property, Plant and Equipment, over a five-year period for unprotected EDIT not associated with Property, Plant and Equipment and over a three-year period for the deferred revenues; and

•Approval of a $12 million increase due to the expiration of EDIT related to reductions in the North Carolina state income tax rate from 6.9% to 2.5%.

As a result of the order, revised customer rates were effective June 1, 2019. On May 31, 2019, Duke Energy Progress filed a Petition for Rehearing or Reconsideration of that order contending substantial rights of Duke Energy Progress were prejudiced by unlawful, arbitrary and capricious rulings by the PSCSC on certain issues presented in the proceeding. On June 19, 2019, the PSCSC issued a Directive denying Duke Energy Progress' request to rehear or reconsider the commission's rulings on certain issues presented in the proceeding including coal ash remediation and disposal costs, ROE and the recovery of a return on deferred operation and maintenance expenses, but allowing additional litigation-related costs. As a result of the Directive allowing litigation-related costs, customer rates were revised effective July 1, 2019. An order detailing the commission's decision in the Directive was issued on October 18, 2019. Duke Energy Progress filed a notice of appeal on November 15, 2019, with the Supreme Court of South Carolina. Initial briefs were filed on April 21, 2020. Response briefs were filed on July 6, 2020, and reply briefs were filed on August 11, 2020. Oral arguments were heard before the Supreme Court of South Carolina on May 26, 2021.

On October 27, 2021, the Supreme Court of South Carolina affirmed the PSCSC's May 2019 order to:

•Disallow cost recovery on certain CCR compliance costs the PSCSC deemed to be incremental to the federal CCR rules;

•Disallow recovery of certain coal ash litigation expenses; and

•Disallow a return on certain deferred expenses.

The Supreme Court's decision notes the prior determination made by the PSCSC that Duke Energy could submit coal ash costs for recovery that were not initially approved in the rate case order if such costs can be attributed to the CCR rules. As a result of the Court's opinion, Duke Energy Progress recognized a pretax charge of approximately $42 million to Impairment of assets and other charges, and a $6 million increase in Other income and expenses, net, in the Condensed Consolidated Statement of Operations for the three and nine months ended September 30, 2021, principally related to coal ash remediation at retired coal ash basin sites. Duke Energy Progress is evaluating whether to file a Petition for rehearing on the Supreme Court's decision. Petitions are due November 11, 2021, unless an extension is sought and granted.

Western Carolinas Modernization Plan

On October 8, 2018, Duke Energy Progress filed an application with the NCUC for a CPCN to construct the Hot Springs Microgrid Solar and Battery Storage Facility, which was approved with certain conditions on May 10, 2019. A hearing to update the NCUC on the status of the project was held on March 5, 2020. Construction began in May 2020 with commercial operation expected to begin in December 2021.

On July 27, 2020, Duke Energy Progress filed an application with the NCUC for a CPCN to construct the Woodfin Solar Facility, a 5-MW solar generating facility to be constructed on a closed landfill in Buncombe County. The expert hearing was held on November 18, 2020. The application was approved and a CPCN was granted by order of the NCUC on April 20, 2021. Construction began in April 2021 with an expected in-service date in March 2022.

FERC Return on Equity Complaints

On October 11, 2019, North Carolina Eastern Municipal Power Agency (NCEMPA) filed a complaint at the FERC against Duke Energy Progress pursuant to Section 206 of the Federal Power Act (FPA), alleging that the 11% stated ROE component contained in the demand formula rate in the Full Requirements Power Purchase Agreement (FRPPA) between NCEMPA and Duke Energy Progress is unjust and unreasonable. On July 16, 2020, the FERC set this matter for hearing and settlement judge procedures and established a refund effective date of October 11, 2019. In its order setting the matter for settlement, the FERC allowed for the consideration of variations to the base transmission-related ROE methodology developed in its Order No. 569-A, through the introduction of “specific facts and circumstances” involving issues specific to the case. The parties reached a settlement in principle at a settlement conference on January 7, 2021, and filed a settlement package on March 10, 2021. The FERC Trial Staff filed comments in support of the settlement. On April 19, 2021, the Settlement Judge certified the settlement to the FERC as an uncontested settlement. The FERC approved the settlement on May 25, 2021, and Duke Energy Progress filed compliance documents on June 10, 2021. The FERC accepted the compliance filing on October 8, 2021.

On October 16, 2020, North Carolina Electric Membership Corporation (NCEMC) filed a complaint at the FERC against Duke Energy Progress pursuant to Section 206 of the FPA, alleging that the 11% stated ROE component in the demand formula rate in the Power Supply and Coordination Agreement between NCEMC and Duke Energy Progress is unjust and unreasonable. Under FPA Section 206, the earliest refund effective date that the FERC can establish is the date of the filing of the complaint. Duke Energy Progress responded to the complaint on November 20, 2020, seeking dismissal, demonstrating that the 11% ROE is just and reasonable for the service provided. The parties filed responsive pleadings and are awaiting an order from the FERC. Duke Energy Progress cannot predict the outcome of this matter.

Duke Energy Florida

2021 Settlement Agreement

On January 14, 2021, Duke Energy Florida filed a Settlement Agreement (the “2021 Settlement”) with the FPSC. The parties to the 2021 Settlement include Duke Energy Florida, the Office of Public Counsel (OPC), the Florida Industrial Power Users Group, White Springs Agricultural Chemicals, Inc. d/b/a PCS Phosphate and NUCOR Steel Florida, Inc. (collectively, the “Parties”).

Pursuant to the 2021 Settlement, the Parties agreed to a base rate stay-out provision that expires year-end 2024; however, Duke Energy Florida is allowed an increase to its base rates of an incremental $67 million in 2022, $49 million in 2023 and $79 million in 2024, subject to adjustment in the event of tax reform during the years 2021, 2022 and 2023. The Parties also agreed to an ROE band of 8.85% to 10.85% with a midpoint of 9.85% based on a capital structure of 53% equity and 47% debt. The ROE band can be increased by 25 basis points if the average 30-year U.S. Treasury rate increases 50 basis points or more over a six-month period in which case the midpoint ROE would rise from 9.85% to 10.10%. Duke Energy Florida will also be able to retain the DOE award of approximately $173 million for spent nuclear fuel, which is expected to be received in 2022, in order to mitigate customer rates over the term of the 2021 Settlement. In return, Duke Energy Florida will be able to recognize the $173 million into earnings from 2022 through 2024.

In addition to these terms, the 2021 Settlement contains provisions related to the accelerated depreciation of Crystal River Units 4-5, the approval of approximately $1 billion in future investments in new cost-effective solar power, the implementation of a new Electric Vehicle Charging Station Program and the deferral and recovery of costs in connection with the implementation of Duke Energy Florida’s Vision Florida program, which explores various emerging non-carbon emitting generation technology, distributed technologies and resiliency projects, among other things. The 2021 Settlement also resolves remaining unrecovered storm costs for Hurricane Dorian and Hurricane Michael.

The FPSC approved the 2021 Settlement on May 4, 2021, issuing an order on June 4, 2021. Revised customer rates will be effective January 1, 2022, with subsequent base rate increases effective January 1, 2023, and January 1, 2024.

Storm Restoration Cost Recovery

Duke Energy Florida filed a petition with the FPSC on April 30, 2019, to recover $223 million of estimated retail incremental storm restoration costs for Hurricane Michael, consistent with the provisions in the 2017 Settlement, and the FPSC approved the petition on June 11, 2019. The FPSC also approved allowing Duke Energy Florida to use the tax savings resulting from the Tax Act to recover these storm costs in lieu of implementing a storm surcharge. Approved storm costs are currently expected to be fully recovered by year-end 2021. On November 22, 2019, Duke Energy Florida filed a petition for approval of actual retail recoverable storm restoration costs related to Hurricane Michael in the amount of $191 million plus interest. On May 19, 2020, Duke Energy Florida filed a supplemental true up reducing the actual retail recoverable storm restoration costs related to Hurricane Michael by approximately $3 million, resulting in a total request to recover $188 million actual retail recoverable storm restoration costs, plus interest. Approximately $80 million of these costs are included in Regulatory assets within Current Assets and Other Noncurrent Assets on the Condensed Consolidated Balance Sheets as of December 31, 2020.

Duke Energy Florida filed a petition with the FPSC on December 19, 2019, to recover $169 million of estimated retail incremental storm restoration costs for Hurricane Dorian, consistent with the provisions in the 2017 Settlement and the FPSC approved the petition on February 24, 2020. The final actual amount of $145 million was filed on September 30, 2020. The 2021 Settlement resolved all matters regarding storm cost recovery relating to Hurricane Michael and Hurricane Dorian.

Clean Energy Connection

On July 1, 2020, Duke Energy Florida petitioned the FPSC for approval of a voluntary solar program. The program consists of 10 new solar generating facilities with combined capacity of approximately 750 MW. The program allows participants to support cost-effective solar development in Florida by paying a subscription fee based on per kilowatt-subscriptions and receiving a credit on their bill based on the actual generation associated with their portion of the solar portfolio. The estimated cost of the 10 new solar generation facilities is approximately $1 billion over the next four years, and this investment will be included in base rates offset by the revenue from the subscription fees. The credits will be included for recovery in the fuel cost recovery clause. A remote hearing was held on November 17, 2020, and post-hearing briefs were filed with the FPSC from all parties by December 9, 2020. The FPSC voted to approve the program on January 5, 2021, and issued its written order on January 26, 2021.

On February 24, 2021, the League of United Latin American Citizens (LULAC) filed a notice of appeal of the FPSC’s order approving the Clean Energy Connection to the Supreme Court of Florida. LULAC's initial brief was filed on May 26, 2021, and Appellees' response briefs were filed on July 26, 2021. LULAC's reply brief was filed on September 24, 2021, and its request for oral argument was filed on September 28, 2021. The FPSC approval order remains in effect pending the outcome of the appeal. Duke Energy Florida cannot predict the outcome of this matter.

Duke Energy Ohio

Duke Energy Ohio Electric Base Rate Case

Duke Energy Ohio filed with the PUCO an electric distribution base rate case application on October 1, 2021, with supporting testimony filed on October 15, 2021, requesting an increase in electric distribution base rates of approximately $55 million and an ROE of 10.3%. This is an approximate 3.3% average increase across all customer classes. The drivers for this case are capital invested since Duke Energy Ohio's last electric distribution base rate case in 2017. Duke Energy Ohio is also seeking to adjust the caps on its Distribution Capital Investment Rider (DCI Rider). Duke Energy Ohio anticipates the PUCO will rule on the request by the summer of 2022. Duke Energy Ohio cannot predict the outcome of this matter.

Ohio House Bill 6

On July 23, 2019, House Bill 6 was signed into law and became effective January 1, 2020. Among other things, the bill allows for funding, through a rider mechanism referred to as the Clean Air Fund (Rider CAF), of two nuclear generating facilities located in Northern Ohio owned by Energy Harbor (f/k/a FirstEnergy Solutions) and certain renewable resources, repeal of energy efficiency mandates and recovery of prudently incurred costs, net of any revenues, for Ohio investor-owned utilities that are participants under the OVEC power agreement. The OVEC recovery is through a non-bypassable rider that replaced any existing recovery mechanism approved by the PUCO and will remain in place through 2030. As such, Duke Energy Ohio created the Legacy Generation Rider (Rider LGR) that replaced Rider PSR effective January 1, 2020. The amounts recoverable from customers are subject to an annual cap, with incremental costs that exceed such cap eligible for deferral and recovery subject to review. See Note 11 for additional discussion of Duke Energy Ohio's ownership interest in OVEC. House Bill 128 was signed into law on March 31, 2021, and became effective June 30, 2021. The bill removes nuclear plant funding included in HB 6, eliminates Rider CAF and establishes the Solar Generation Fund Rider (Rider SGF) to recover the renewable investments originally included in HB 6. HB 128 does not impact OVEC cost recovery or any transmission or distribution rider.

Energy Efficiency Cost Recovery

On February 26, 2020, the PUCO issued an order directing utilities to wind down their demand-side management programs by September 30, 2020, and to terminate the programs by December 31, 2020, in response to changes in Ohio law that eliminated Ohio's energy efficiency mandates. On March 27, 2020, Duke Energy Ohio filed an Application for Rehearing seeking clarification on the final true up and reconciliation process after 2020. On November 18, 2020, the PUCO issued two orders on the application for rehearing. The first order was a Third Entry on Rehearing on the Duke Energy Ohio portfolio holding the cost cap previously imposed was unlawful, a shared savings cap of $8 million pretax should be imposed and lost distribution revenues could not be recovered after December 31, 2020. The second order directs all utilities set the rider to zero effective January 1, 2021, and to file a separate application for final reconciliation of all energy efficiency costs prior to December 31, 2020. On December 18, 2020, Duke Energy Ohio filed an application for rehearing. On January 13, 2021, the application for rehearing was granted for further consideration. Duke Energy Ohio cannot predict the outcome of this matter.

On October 9, 2020, Duke Energy Ohio filed an application to implement a voluntary energy efficiency program portfolio to commence on January 1, 2021. The application proposes a mechanism for recovery of program costs and a benefit associated with avoided transmission and distribution costs. The application remains under review. Effective January 1, 2021, Duke Energy Ohio suspended its energy efficiency programs due to changes in Ohio law. On June 14, 2021, the PUCO issued an entry for each utility to file by July 15, 2021, a proposal to reestablish low-income programs through December 31, 2021. Duke Energy Ohio filed its application on July 14, 2021. Duke Energy Ohio cannot predict the outcome of this matter.

Natural Gas Pipeline Extension

Duke Energy Ohio is installing a new natural gas pipeline (the Central Corridor Project) in its Ohio service territory to increase system reliability and enable the retirement of older infrastructure. Duke Energy Ohio currently estimates the pipeline development costs and construction activities will range from $185 million to $205 million in direct costs (excluding overheads and AFUDC) and that construction of the pipeline extension will be completed in time for use during the 2021/2022 winter season. An evidentiary hearing on Duke Energy Ohio's application for a Certificate of Environmental Compatibility and Public Need concluded on April 11, 2019. On November 21, 2019, the Ohio Power Siting Board (OPSB) approved Duke Energy Ohio's application subject to 41 conditions on construction. Applications for rehearing were filed by several stakeholders on December 23, 2019, arguing that the OPSB approval was incorrect. On February 20, 2020, the OPSB denied the rehearing requests. On April 15, 2020, those stakeholders filed a notice of appeal at the Supreme Court of Ohio of the OPSB’s decision approving Duke Energy Ohio’s Central Corridor project application. The Ohio Supreme Court affirmed the OPSB order on September 22, 2021.

On September 22, 2020, Duke Energy Ohio filed an application with the OPSB for approval to amend the certificated pipeline route due to changes in the route negotiated with property owners and municipalities. On January 21, 2021, the OPSB approved the amended filing with recommended conditions that reaffirm previous conditions and provide guidance regarding local permitting and construction supervision.

MGP Cost Recovery

In an order issued in 2013, the PUCO approved Duke Energy Ohio's deferral and recovery of costs related to environmental remediation at two sites (East End and West End) that housed former MGP operations. Duke Energy Ohio has collected approximately $55 million in environmental remediation costs incurred between 2008 through 2012 through Rider MGP, which is currently suspended. Duke Energy Ohio has made annual applications with the PUCO to recover its incremental remediation costs consistent with the PUCO’s directive in Duke Energy Ohio’s 2012 natural gas base rate case. To date, the PUCO has not ruled on Duke Energy Ohio’s annual applications for the calendar years 2013 through 2019. On September 28, 2018, the Staff of the PUCO (Staff) issued a report recommending a disallowance of approximately $12 million of the $26 million in MGP remediation costs incurred between 2013 through 2017 that Staff believes are not eligible for recovery. Staff interprets the PUCO’s 2013 order granting Duke Energy Ohio recovery of MGP remediation as limiting the recovery to work directly on the East End and West End sites. On October 30, 2018, Duke Energy Ohio filed reply comments objecting to the Staff’s recommendations and explaining, among other things, the obligation Duke Energy Ohio has under Ohio law to remediate all areas impacted by the former MGPs and not just physical property that housed the former plants and equipment. On March 29, 2019, Duke Energy Ohio filed its annual application to recover incremental remediation expense for the calendar year 2018 seeking recovery of approximately $20 million in remediation costs. On July 12, 2019, the Staff recommended a disallowance of approximately $11 million for work that the Staff believes occurred in areas not authorized for recovery. Additionally, the Staff recommended that any discussion pertaining to Duke Energy Ohio's recovery of ongoing MGP costs should be directly tied to or netted against insurance proceeds collected by Duke Energy Ohio. An evidentiary hearing concluded on November 21, 2019. Initial briefs were filed on January 17, 2020, and reply briefs were filed on February 14, 2020.

On March 31, 2020, Duke Energy Ohio filed its annual application to recover incremental MGP remediation expense, seeking recovery of approximately $39 million in remediation costs incurred during 2019. On July 23, 2020, the Staff recommended a disallowance of approximately $4 million for work the Staff believes occurred in areas not authorized for recovery. Additionally, the Staff recommended insurance proceeds, net of litigation costs and attorney fees, should be paid to customers and not be held by Duke Energy Ohio until all investigation and remediation is complete. Duke Energy Ohio filed comments in response to the Staff report on August 21, 2020, and intervenor comments were filed on November 9, 2020.

The 2013 PUCO order also contained conditional deadlines for completing the MGP environmental remediation and the deferral of related remediation costs. Subsequent to the order, the deadline was extended to December 31, 2019. On May 10, 2019, Duke Energy Ohio filed an application requesting a continuation of its existing deferral authority for MGP remediation that must occur after December 31, 2019. On July 12, 2019, the Staff recommended the commission deny the deferral authority request. On September 13, 2019, intervenor comments were filed opposing Duke Energy Ohio's request for continuation of existing deferral authority and on October 2, 2019, Duke Energy Ohio filed reply comments.

A Stipulation and Recommendation was filed jointly by Duke Energy Ohio, the Staff, the Office of the Ohio Consumers' Counsel and the Ohio Energy Group on August 31, 2021, which is subject to review and approval by the PUCO. If approved, the Stipulation and Recommendation would, among other things, resolve all open issues regarding MGP remediation costs incurred between 2013 and 2019, including Duke Energy Ohio’s request for additional deferral authority beyond 2019, and the pending issues related to the Tax Act as it relates to Duke Energy Ohio’s natural gas operations. These impacts are not expected to have a material impact on the Duke Energy Ohio financial statements. The Stipulation and Recommendation further acknowledges Duke Energy Ohio’s ability to file a request for additional deferral authority in the future related to environmental remediation of any MGP impacts in the Ohio River if necessary, subject to specific conditions. On October 15, 2021, the PUCO granted motions to intervene filed in September 2021 by Interstate Gas Supply, Inc. and Retail Energy Supply Association on a limited basis. An evidentiary hearing is scheduled for November 22, 2021. Duke Energy Ohio cannot predict the outcome of this matter.

Tax Act – Ohio

On December 21, 2018, Duke Energy Ohio filed an application to change its base rate tariffs and establish a new rider to implement the benefits of the Tax Act for natural gas customers. Duke Energy Ohio requested commission approval to implement the tariff changes and rider effective April 1, 2019. The new rider will flow through to customers the benefit of the reduction in the statutory federal tax rate from 35% to 21% since January 1, 2018, all future benefits of the lower tax rates and a full refund of deferred income taxes collected at the higher tax rates in prior years. Deferred income taxes subject to normalization rules will be refunded consistent with federal law and deferred income taxes not subject to normalization rules will be refunded over a 10-year period. The PUCO established a procedural schedule and testimony was filed on July 31, 2019. An evidentiary hearing occurred on August 7, 2019. Initial briefs were filed on September 11, 2019. Reply briefs were filed on September 25, 2019. The Stipulation and Recommendation filed on August 31, 2021, disclosed in the MGP Cost Recovery matter above, also resolves the outstanding issues in this proceeding. On October 15, 2021, the PUCO granted motions to intervene filed in September 2021 by Interstate Gas Supply, Inc. and Retail Energy Supply Association on a limited basis. An evidentiary hearing is scheduled for November 22, 2021. Duke Energy Ohio cannot predict the outcome of this matter.

Duke Energy Kentucky Natural Gas Base Rate Case

On June 1, 2021, Duke Energy Kentucky filed an application with the KPSC requesting an increase in natural gas base rates of approximately $15 million, an approximate 13% average increase across all customer classes. The drivers for this case are capital invested since Duke Energy Kentucky's last natural gas base rate case in 2018. Duke Energy Kentucky is also seeking implementation of a Governmental Mandate Adjustment mechanism (Rider GMA) in order to recover from or pay to customers the financial impact of governmental directives and mandates, including changes in federal or state tax rates and regulations issued by the Pipeline and Hazardous Materials Safety Administration (PHMSA). On October 8, 2021, Duke Energy Kentucky filed a Stipulation and Recommendation jointly with the Kentucky Attorney General, subject to review and approval by the KPSC, which if approved, would resolve the case. The Stipulation and Recommendation includes a $9 million increase in base revenues, an ROE of 9.375% for natural gas base rates and 9.3% for natural gas riders, a rider for PHMSA-required capital investments with an annual 5% rate increase cap and a four-year natural gas base rate case stay-out. The hearing was held on October 18, 2021. Duke Energy Kentucky anticipates the KPSC will rule on the request by the end of 2021. Duke Energy Kentucky cannot predict the outcome of this matter.

Midwest Propane Caverns

Duke Energy Ohio uses propane stored in caverns to meet peak demand during winter. Once the Central Corridor Project is complete, the propane peaking facilities will no longer be necessary and will be retired. On October 7, 2021, Duke Energy Ohio requested deferral treatment of the property, plant and equipment as well as costs related to propane inventory and decommissioning costs. There is approximately $27 million in Property, Plant and Equipment on the Condensed Consolidated Balance Sheets as of September 30, 2021, and December 31, 2020, related to the propane caverns. Duke Energy Ohio cannot predict the outcome of this matter.

Duke Energy Indiana

2019 Indiana Rate Case

On July 2, 2019, Duke Energy Indiana filed a general rate case with the IURC for a rate increase for retail customers of approximately $395 million. The rebuttal case, filed on December 4, 2019, updated the requested revenue requirement to result in a 15.6% or $396 million average retail rate increase, including the impacts of the Utility Receipts Tax. Hearings concluded on February 7, 2020. On June 29, 2020, the IURC issued an order in the rate case approving a revenue increase of $146 million before certain adjustments and ratemaking refinements. The order approved Duke Energy Indiana’s requested forecasted rate base of $10.2 billion as of December 31, 2020, including the Edwardsport Integrated Gasification Combined Cycle (IGCC) Plant. The IURC reduced Duke Energy Indiana’s request by slightly more than $200 million, when accounting for the utility receipts tax and other adjustments. Approximately 50% of the reduction was due to a prospective change in depreciation and use of regulatory asset for the end-of-life inventory at retired generating plants, approximately 20% was due to the approved ROE of 9.7% versus the requested ROE of 10.4% and approximately 20% was related to miscellaneous earnings neutral adjustments. Step one rates were estimated to be approximately 75% of the total and became effective on July 30, 2020. Step two rates are estimated to be the remaining 25% of the total rate increase. Step two rates were approved July 28, 2021, and implemented in August 2021. Step two rates are based on a return on equity of 9.7% and actual December 31, 2020 capital structure with a 54% equity component. Step two rates will be reconciled to January 1, 2021. Several groups appealed the IURC order to the Indiana Court of Appeals. Appellate briefs were filed on October 14, 2020, focusing on three issues: wholesale sales allocations, coal ash basin cost recovery and the Edwardsport IGCC operating and maintenance expense level approved. The appeal was fully briefed in January 2021 and an oral argument was held on April 8, 2021. The Indiana Court of Appeals affirmed the IURC decision on May 13, 2021. The Indiana Office of Utility Consumer Counselor (OUCC) and the Duke Industrial Group filed a joint petition to transfer the rate case appeal to the Indiana Supreme Court on June 28, 2021. Response briefs were filed July 19, 2021. The Indiana Supreme Court granted the petition to transfer on September 16, 2021, and scheduled oral argument for November 16, 2021. Duke Energy Indiana cannot predict the outcome of this matter.

2020 Indiana Coal Ash Recovery Case

In Duke Energy Indiana’s 2019 rate case, the IURC approved coal ash basin closure costs expended through 2018 including financing costs as a regulatory asset and included in rate base. The IURC also opened a subdocket for post-2018 coal ash related expenditures. Duke Energy Indiana filed testimony on April 15, 2020, in the coal ash subdocket requesting recovery for the post-2018 coal ash basin closure costs for plans that have been approved by the Indiana Department of Environmental Management (IDEM) as well as continuing deferral, with carrying costs, on the balance. An evidentiary hearing was held on September 14, 2020. Briefing was completed by mid-September 2021. On November 3, 2021, the IURC issued an order allowing recovery for post-2018 coal ash basin closure costs for the plans that have been approved by IDEM, as well as continuing deferral, with carrying costs, on the balance. The IURC order is subject to appeal within 30 days to the IURC or the Indiana Court of Appeals. Duke Energy Indiana cannot predict the outcome of this matter.

Piedmont

2020 Tennessee Rate Case

On July 2, 2020, Piedmont filed an application with the TPUC, its first general rate case in Tennessee in nine years, for a rate increase for retail customers of approximately $30 million, which represents an approximate 15% increase in annual revenues. The rate increase is driven by significant infrastructure upgrade investments since Piedmont's previous rate case. Approximately half of the plant additions being added to rate base are categories of capital investment not covered under the IMR mechanism, which was approved in 2013. Piedmont amended its requested increase to approximately $26 million in December 2020. As authorized under Tennessee law, Piedmont implemented interim rates on January 2, 2021, at the level requested in its adjusted request. A settlement reached with the Tennessee Consumer Advocate in mid-January was filed with the TPUC on February 2, 2021. The settlement results in an increase of revenues of approximately $16 million and an ROE of 9.8%. On May 6, 2021, the TPUC issued an order approving the settlement. Revised customer rates became effective January 2, 2021. Piedmont refunded customers the difference between bills previously rendered under interim rates and such bills if rendered under approved rates, plus interest, in April 2021.

2021 North Carolina Rate Case

On March 22, 2021, Piedmont filed an application with the NCUC for a rate increase for retail customers of approximately $109 million, which represents an approximate 10% increase in retail revenues. The rate increase is driven by customer growth and significant infrastructure upgrade investments (plant additions) since the last general rate case. Approximately 70% of the plant additions being rolled into rate base are categories of plant investment not covered under the IMR mechanism, which was originally approved as part of the 2013 North Carolina Rate Case. On July 28, 2021, Piedmont amended its requested increase to approximately $97 million.

On September 7, 2021, Piedmont and the Public Staff, the Carolina Utility Customers Association, Inc. and the Carolina Industrial Group for Fair Utility Rates IV filed a Stipulation of Partial Settlement (Stipulation), which is subject to review and approval by the NCUC, resolving most issues between these parties. Major components of the Stipulation include:

•A return on equity of 9.6% and a capital structure of 51.6% equity and 48.4% debt;

•Continuation of the IMR mechanism and margin decoupling; and

•A revenue increase of $67 million, subject to completion of the Robeson County LNG facility and the Pender Onslow County expansion project.

An evidentiary hearing to review the Stipulation and other issues concluded on September 9, 2021. On October 12, 2021, Piedmont notified the NCUC of its intent to implement the stipulated rates effective November 1, 2021, on a temporary basis and subject to refund. On October 18, 2021, Piedmont and the Public Staff filed supplemental testimony attesting to the completion of the Robeson County LNG facility and the Pender Onslow County expansion project and to the propriety of including the capital investment for these two projects in this proceeding. Piedmont cannot predict the outcome of this matter.

OTHER REGULATORY MATTERS

Atlantic Coast Pipeline, LLC

Atlantic Coast Pipeline (ACP pipeline) was planned to be an approximately 600-mile interstate natural gas pipeline running from West Virginia to North Carolina. Duke Energy indirectly owns a 47% interest, which is accounted for as an equity method investment through its Gas Utilities and Infrastructure segment.

As a result of the uncertainty created by various legal rulings, the potential impact on the cost and schedule for the project, the ongoing legal challenges and the risk of additional legal challenges and delays through the construction period and Dominion’s decision to sell substantially all of its gas transmission and storage segment assets, Duke Energy's Board of Directors and management decided that it was not prudent to continue to invest in the project. On July 5, 2020, Duke Energy and Dominion announced the cancellation of the ACP pipeline project.

As part of the pretax charges to earnings of approximately $2.1 billion recorded in June 2020, within Equity in (losses) earnings of unconsolidated affiliates on the Duke Energy Condensed Consolidated Statements of Operations, Duke Energy established liabilities related to the cancellation of the ACP pipeline project. In February 2021, Duke Energy paid approximately $855 million to fund ACP's outstanding debt, relieving Duke Energy of its guarantee. At September 30, 2021, there is $36 million and $63 million within Other Current Liabilities and Other Noncurrent Liabilities, respectively, in the Gas Utilities and Infrastructure segment. The liabilities represent Duke Energy's obligation of approximately $99 million to satisfy remaining ARO requirements to restore construction sites.

See Notes 1 and 11 for additional information regarding this transaction.

Potential Coal Plant Retirements

The Subsidiary Registrants periodically file IRPs with their state regulatory commissions. The IRPs provide a view of forecasted energy needs over a long term (10 to 20 years) and options being considered to meet those needs. IRPs filed by the Subsidiary Registrants included planning assumptions to potentially retire certain coal-fired generating facilities in North Carolina and Indiana earlier than their current estimated useful lives. Duke Energy continues to evaluate the potential need to retire these coal-fired generating facilities earlier than the current estimated useful lives and plans to seek regulatory recovery for amounts that would not be otherwise recovered when any of these assets are retired.

The table below contains the net carrying value of generating facilities planned for retirement or included in recent IRPs as evaluated for potential retirement. Dollar amounts in the table below are included in Net property, plant and equipment on the Condensed Consolidated Balance Sheets as of September 30, 2021, and exclude capitalized asset retirement costs.

		Remaining Net
	Capacity	Book Value
	(in MW)	(in millions)
Duke Energy Carolinas
Allen Steam Station Units 1-2(a)	324	$	19
Allen Steam Station Units 4-5(b)	516	362
Cliffside Unit 5(b)	544	367
Duke Energy Progress
Mayo Unit 1(b)	704	640
Roxboro Units 3-4(b)	1,392	465
Duke Energy Florida
Crystal River Units 4-5(c)	1,410	1,658
Duke Energy Indiana (d)
Gibson Units 1-5(e)	2,822	1,814
Cayuga Units 1-2(e)	995	713
Total Duke Energy	8,707	$	6,038

(a)As part of the 2015 resolution of a lawsuit involving alleged New Source Review violations, Duke Energy Carolinas must retire Allen Steam Station Units 1 through 3 by December 31, 2024. The long-term energy options considered in the IRP could result in retirement of these units earlier than their current estimated useful lives. Unit 3 with a capacity of 270 MW and a net book value of $26 million at December 31, 2020, was retired in March 2021.

(b)These units were included in the IRP filed by Duke Energy Carolinas and Duke Energy Progress in North Carolina and South Carolina on September 1, 2020. The long-term energy options considered in the IRP could result in retirement of these units earlier than their current estimated useful lives. In 2019, Duke Energy Carolinas and Duke Energy Progress filed North Carolina rate cases that included depreciation studies that accelerate end-of-life dates for these plants. The NCUC issued orders in the 2019 rate cases of Duke Energy Carolinas and Duke Energy Progress on March 31, 2021, and April 16, 2021, respectively, in which the proposals to shorten the remaining depreciable lives of these units were denied, while indicating the IRP proceeding was the appropriate proceeding for the review of generating plant retirements.

(c)On January 14, 2021, Duke Energy Florida filed a settlement agreement with the FPSC, which proposed depreciation rates reflecting retirement dates for Duke Energy Florida's last two coal-fired generating facilities, Crystal River Units 4-5, eight years ahead of schedule in 2034 rather than in 2042. The settlement was approved by the FPSC on May 4, 2021.

(d)Gallagher Units 2 and 4 with a total capacity of 280 MW and a total net book value of $102 million at December 31, 2020, were retired on June 1, 2021.

(e)The rate case filed July 2, 2019, included proposed depreciation rates reflecting retirement dates from 2026 to 2038. The depreciation rates reflecting these updated retirement dates were approved by the IURC as part of the rate case order issued on June 29, 2020.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2021

Commitments and Contingencies Disclosure [Abstract]

Commitments And Contingencies

COMMITMENTS AND CONTINGENCIES

ENVIRONMENTAL

The Duke Energy Registrants are subject to federal, state and local regulations regarding air and water quality, hazardous and solid waste disposal, coal ash and other environmental matters. These regulations can be changed from time to time, imposing new obligations on the Duke Energy Registrants. The following environmental matters impact all Duke Energy Registrants.

Remediation Activities

In addition to AROs recorded as a result of various environmental regulations, the Duke Energy Registrants are responsible for environmental remediation at various sites. These include certain properties that are part of ongoing operations and sites formerly owned or used by Duke Energy entities. These sites are in various stages of investigation, remediation and monitoring. Managed in conjunction with relevant federal, state and local agencies, remediation activities vary based upon site conditions and location, remediation requirements, complexity and sharing of responsibility. If remediation activities involve joint and several liability provisions, strict liability, or cost recovery or contribution actions, the Duke Energy Registrants could potentially be held responsible for environmental impacts caused by other potentially responsible parties and may also benefit from insurance policies or contractual indemnities that cover some or all cleanup costs. Liabilities are recorded when losses become probable and are reasonably estimable. The total costs that may be incurred cannot be estimated because the extent of environmental impact, allocation among potentially responsible parties, remediation alternatives and/or regulatory decisions have not yet been determined at all sites. Additional costs associated with remediation activities are likely to be incurred in the future and could be significant. Costs are typically expensed as Operation, maintenance and other on the Condensed Consolidated Statements of Operations unless regulatory recovery of the costs is deemed probable.

The following table contains information regarding reserves for probable and estimable costs related to the various environmental sites. These reserves are recorded in Other within Other Noncurrent Liabilities on the Condensed Consolidated Balance Sheets.

(in millions)	September 30, 2021		December 31, 2020
Reserves for Environmental Remediation
Duke Energy	$	74	$	75
Duke Energy Carolinas	19		19
Progress Energy	17		19
Duke Energy Progress	6		6
Duke Energy Florida	11		12
Duke Energy Ohio	21		22
Duke Energy Indiana	5		6
Piedmont	12		10

Additional losses in excess of recorded reserves that could be incurred for the stages of investigation, remediation and monitoring for environmental sites that have been evaluated at this time are not material.

LITIGATION

Duke Energy

Texas Storm Uri Tort Litigation

Duke Energy and several Duke Energy renewables project companies have been named in multiple lawsuits arising out of Texas Storm Uri in mid-February 2021, and particularly, in the deregulated market managed by the Electric Reliability Council of Texas. There are 30 state court actions pending. These lawsuits seek recovery for property damages, personal injury and for wrongful death allegedly incurred by the plaintiffs as a result of power outages, which the plaintiffs claim was the result of the defendants' failures. The cases pending in state court have been consolidated into a Texas state court multidistrict litigation proceeding before a single judge to handle all pretrial coordination. Duke Energy cannot predict the outcomes of these matters.

Duke Energy Carolinas and Duke Energy Progress

Coal Ash Insurance Coverage Litigation

In March 2017, Duke Energy Carolinas and Duke Energy Progress filed a civil action in the North Carolina Business Court against various insurance providers. The lawsuit seeks payment for coal ash related liabilities covered by third-party liability insurance policies. The insurance policies were issued between 1971 and 1986 and provide third-party liability insurance for property damage. The civil action seeks damages for breach of contract and indemnification for costs arising from the Coal Ash Act and the U.S. Environmental Protection Agency CCR rule at 15 coal-fired plants in North Carolina and South Carolina.

Duke Energy Carolinas and Duke Energy Progress have resolved claims against all, but two of the insurers, sued in this litigation and are dismissing their claims against the settling insurers. Duke Energy Carolinas and Duke Energy Progress have received approximately $418 million of coal ash insurance litigation proceeds from settlements with insurer-defendants and these proceeds will be distributed in accordance with the terms of the CCR settlement agreement. The companies are assessing their options with regard to the two remaining foreign insurers that have defaulted. Duke Energy Carolinas and Duke Energy Progress cannot predict the outcome of this matter.

Duke Energy Carolinas

Ruben Villano, et al. v. Duke Energy Carolinas, LLC

On June 16, 2021, a group of nine individuals went over a low head dam adjacent to the Dan River Steam Station in Eden, North Carolina, while water tubing. Emergency personnel rescued four people and five others were confirmed deceased. On August 11, 2021, Duke Energy Carolinas was served with the complaint filed in Durham County Superior Court on behalf of four survivors, which was later amended to include all the decedents along with the survivors. The lawsuit alleges that Duke Energy Carolinas knew that the river was used for recreational purposes and that Duke Energy did not adequately warn about the dam. On September 30, 2021, Duke Energy Carolinas filed its Motion to Dismiss and Motion for Transfer of Venue from Durham County to Rockingham County. A hearing on these motions is set for November 15, 2021, and discovery has commenced. Duke Energy Carolinas cannot predict the outcome of this matter.

NTE Carolinas II, LLC Litigation

In November 2017, Duke Energy Carolinas entered into a standard FERC large generator interconnection agreement (LGIA) with NTE Carolinas II, LLC (NTE), a company that proposed to build a combined-cycle natural gas plant in Rockingham County, North Carolina. On September 6, 2019, Duke Energy Carolinas filed a lawsuit in Mecklenburg County Superior Court against NTE for breach of contract, alleging that NTE's failure to pay benchmark payments for Duke Energy Carolinas' transmission system upgrades required under the interconnection agreement constituted a termination of the interconnection agreement. Duke Energy Carolinas is seeking a monetary judgment against NTE because NTE failed to make multiple milestone payments. The lawsuit was moved to federal court in North Carolina. NTE filed a motion to dismiss Duke Energy Carolinas’ complaint and brought counterclaims alleging anti-competitive conduct and violations of state and federal statutes. Duke Energy Carolinas filed a motion to dismiss NTE's counterclaims.

On May 21, 2020, in response to a NTE petition challenging Duke Energy Carolinas' termination of the LGIA, FERC issued a ruling that 1) it has exclusive jurisdiction to determine whether a transmission provider may terminate a LGIA; 2) FERC approval is required to terminate a conforming LGIA if objected to by the interconnection customer; and 3) Duke Energy may not announce the termination of a conforming LGIA unless FERC has approved the termination. FERC's Office of Enforcement also initiated an investigation of Duke Energy Carolinas into matters pertaining to the LGIA. Duke Energy Carolinas is cooperating with the Office of Enforcement but cannot predict the outcome of this investigation.

On August 17, 2020, the court denied both NTE’s and Duke Energy Carolinas’ Motion to Dismiss. The parties are in active discovery and trial is scheduled for June 20, 2022. Duke Energy Carolinas cannot predict the outcome of this matter.

Asbestos-related Injuries and Damages Claims

Duke Energy Carolinas has experienced numerous claims for indemnification and medical cost reimbursement related to asbestos exposure. These claims relate to damages for bodily injuries alleged to have arisen from exposure to or use of asbestos in connection with construction and maintenance activities conducted on its electric generation plants prior to 1985. As of September 30, 2021, there were 74 asserted claims for non-malignant cases with cumulative relief sought of up to $15 million, and 58 asserted claims for malignant cases with cumulative relief sought of up to $21 million. Based on Duke Energy Carolinas’ experience, it is expected that the ultimate resolution of most of these claims likely will be less than the amount claimed.

Duke Energy Carolinas has recognized asbestos-related reserves of $508 million at September 30, 2021, and $572 million at December 31, 2020. These reserves are classified in Other within Other Noncurrent Liabilities and Other within Current Liabilities on the Condensed Consolidated Balance Sheets. These reserves are based upon Duke Energy Carolinas' best estimate for current and future asbestos claims through 2041 and are recorded on an undiscounted basis. In light of the uncertainties inherent in a longer-term forecast, management does not believe they can reasonably estimate the indemnity and medical costs that might be incurred after 2041 related to such potential claims. It is possible Duke Energy Carolinas may incur asbestos liabilities in excess of the recorded reserves.

Duke Energy Carolinas has third-party insurance to cover certain losses related to asbestos-related injuries and damages above an aggregate self-insured retention. Duke Energy Carolinas’ cumulative payments began to exceed the self-insured retention in 2008. Future payments up to the policy limit will be reimbursed by the third-party insurance carrier. The insurance policy limit for potential future insurance recoveries indemnification and medical cost claim payments is $697 million in excess of the self-insured retention. Receivables for insurance recoveries were $644 million at September 30, 2021, and $704 million at December 31, 2020. These amounts are classified in Other within Other Noncurrent Assets and Receivables within Current Assets on the Condensed Consolidated Balance Sheets. Duke Energy Carolinas is not aware of any uncertainties regarding the legal sufficiency of insurance claims. Duke Energy Carolinas believes the insurance recovery asset is probable of recovery as the insurance carrier continues to have a strong financial strength rating.

As described in Note 1, Duke Energy adopted the new guidance for credit losses effective January 1, 2020, using the modified retrospective method of adoption, which does not require restatement of prior year reported results. The reserve for credit losses for insurance receivables based on adoption of the new standard is $15 million for Duke Energy and Duke Energy Carolinas as of September 30, 2021, and December 31, 2020. The insurance receivable is evaluated based on the risk of default and the historical losses, current conditions and expected conditions around collectability. Management evaluates the risk of default annually based on payment history, credit rating and changes in the risk of default from credit agencies.

Duke Energy Progress and Duke Energy Florida

Spent Nuclear Fuel Matters

On June 18, 2018, Duke Energy Progress and Duke Energy Florida sued the U.S. in the U.S. Court of Federal Claims for damages incurred for the period 2014 through 2018. The lawsuit claimed the Department of Energy breached a contract in failing to accept spent nuclear fuel under the Nuclear Waste Policy Act of 1982 and asserted damages for the cost of on-site storage in the amount of $100 million and $200 million for Duke Energy Progress and Duke Energy Florida, respectively. Discovery is now complete, and trial is anticipated to be scheduled in 2022. Duke Energy Progress and Duke Energy Florida cannot predict the outcome of this matter.

Duke Energy Florida

Power Purchase Dispute Arbitration

Duke Energy Florida, on behalf of its customers, entered into a PPA for the purchase of firm capacity and energy from a qualifying facility under the Public Utilities Regulatory Policies Act of 1978. Duke Energy Florida determined the qualifying facility did not perform in accordance with the PPA, and Duke Energy Florida terminated the PPA. The qualifying facility counterparty filed a confidential American Arbitration Association (AAA) arbitration demand, challenging the termination of the PPA and seeking damages.

The final arbitration hearing occurred during the week of December 7, 2020. An interim arbitral award was issued in March 2021, upholding Duke Energy Florida's positions on all issues and awarding the company termination costs. In May 2021, the final arbitral award was issued awarding Duke Energy Florida its claimed fees and costs. On August 18, 2021, Duke Energy Florida filed a motion in Florida state court to confirm the arbitral award.

Duke Energy Indiana

Coal Ash Basin Closure Plan Appeal

On January 27, 2020, Hoosier Environmental Council (HEC) filed a Petition for Administrative Review with the Indiana Office of Environmental Adjudication challenging the Indiana Department of Environmental Management’s (IDEM's) December 10, 2019, partial approval of Duke Energy Indiana’s ash pond closure plan. After hearing oral arguments in early April 2021 on Duke Energy Indiana's and HEC's competing Motions for Summary Judgment, on May 4, 2021, the administrative court rejected all of HEC’s claims and issued a ruling in favor of Duke Energy Indiana. On June 3, 2021, HEC filed an appeal in Superior Court to seek judicial review of the order. On June 25, 2021, Duke Energy Indiana filed its response to the Petition to Review. On August 30, 2021, HEC served Duke Energy Indiana with its Brief in Support of Petition for Judicial Review. On October 29, 2021, Duke Energy Indiana and IDEM filed their response briefs. HEC's Reply Brief is due on or before November 22, 2021. Oral argument will be heard in December 2021, in Marion County Superior Court. Duke Energy Indiana cannot predict the outcome of this matter.

Other Litigation and Legal Proceedings

The Duke Energy Registrants are involved in other legal, tax and regulatory proceedings arising in the ordinary course of business, some of which involve significant amounts. The Duke Energy Registrants believe the final disposition of these proceedings will not have a material effect on their results of operations, cash flows or financial position. Reserves are classified on the Condensed Consolidated Balance Sheets in Other within Other Noncurrent Liabilities and Other within Current Liabilities.

OTHER COMMITMENTS AND CONTINGENCIES

General

As part of their normal business, the Duke Energy Registrants are party to various financial guarantees, performance guarantees and other contractual commitments to extend guarantees of credit and other assistance to various subsidiaries, investees and other third parties. These guarantees involve elements of performance and credit risk, which are not fully recognized on the Condensed Consolidated Balance Sheets and have uncapped maximum potential payments. However, the Duke Energy Registrants do not believe these guarantees will have a material effect on their results of operations, cash flows or financial position.

In addition, the Duke Energy Registrants enter into various fixed-price, noncancelable commitments to purchase or sell power or natural gas, take-or-pay arrangements, transportation, or throughput agreements and other contracts that may or may not be recognized on their respective Condensed Consolidated Balance Sheets. Some of these arrangements may be recognized at fair value on their respective Condensed Consolidated Balance Sheets if such contracts meet the definition of a derivative and the NPNS exception does not apply. In most cases, the Duke Energy Registrants’ purchase obligation contracts contain provisions for price adjustments, minimum purchase levels and other financial commitments.

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Debt and Credit Facilities

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Debt And Credit Facilities

DEBT AND CREDIT FACILITIES

SUMMARY OF SIGNIFICANT DEBT ISSUANCES

The following table summarizes significant debt issuances (in millions).

				Nine Months Ended September 30, 2021
						Duke		Duke		Duke
	Maturity	Interest		Duke		Energy		Energy		Energy
Issuance Date	Date	Rate		Energy		(Parent)		Carolinas		Progress		Piedmont
Unsecured Debt
March 2021(a)	March 2031	2.500	%	$	350	$	—	$	—	$	—	$	350
June 2021(b)(c)	June 2023	2.500	%	500		500		—		—		—
June 2021(c)	June 2031	2.550	%	1,000		1,000		—		—		—
June 2021(c)	June 2041	3.300	%	750		750		—		—		—
June 2021(c)	June 2051	3.500	%	750		750		—		—		—
September 2021(d)	January 2082	3.250	%	500		500		—		—		—
First Mortgage Bonds
April 2021(e)	April 2031	2.550	%	550		—		550		—		—
April 2021(e)	April 2051	3.450	%	450		—		450		—		—
August 2021(f)	August 2031	2.000	%	650		—		—		650		—
August 2021(f)	August 2051	2.900	%	450		—		—		450		—
Total issuances				$	5,950	$	3,500	$	1,000	$	1,100	$	350

(a)Debt issued to repay at maturity $160 million senior unsecured notes due June 2021, pay down short-term debt and for general corporate purposes.

(b)Debt issuance has a floating interest rate.

(c)Debt issued to repay $1.75 billion of Duke Energy (Parent) 2021 debt maturities, to repay a portion of short-term debt and for general corporate purposes.

(d)Debt issued to repay in October 2021 $500 million of Duke Energy (Parent) unsecured notes. The interest rate resets every five years.

(e)Debt issued to repay at maturity $500 million first mortgage bonds due June 2021, pay down short-term debt and for general company purposes.

(f)Debt issued to repay at maturity a total of $600 million first mortgage bonds due September 2021, pay down short-term debt and for general company purposes.

CURRENT MATURITIES OF LONG-TERM DEBT

The following table shows the significant components of Current maturities of long-term debt on the Condensed Consolidated Balance Sheets. The Duke Energy Registrants currently anticipate satisfying these obligations with cash on hand and proceeds from additional borrowings.

(in millions)	Maturity Date	Interest Rate		September 30, 2021
Unsecured Debt
Duke Energy (Parent)(a)	October 2021	5.125	%	500
Duke Energy Florida(b)	November 2021	0.372	%	200
Duke Energy Progress(b)	February 2022	0.305	%	700
Duke Energy (Parent)	March 2022	3.227	%	300
Duke Energy (Parent)(b)	March 2022	0.764	%	300
Progress Energy	April 2022	3.150	%	450
Duke Energy (Parent)	August 2022	3.050	%	500
Duke Energy (Parent)	August 2022	2.400	%	500
First Mortgage Bonds
Duke Energy Indiana	January 2022	8.850	%	53
Duke Energy Carolinas	May 2022	3.350	%	350
Duke Energy Progress	May 2022	2.800	%	500
Other(c)				520
Current maturities of long-term debt				$	4,873

(a)Junior unsecured notes due January 2073 were redeemed on October 7, 2021.

(b)Debt has a floating interest rate.

(c)Includes finance lease obligations, amortizing debt, tax-exempt bonds with mandatory put options and small bullet maturities.

AVAILABLE CREDIT FACILITIES

Master Credit Facility

In March 2021, Duke Energy amended its existing $8 billion Master Credit Facility to extend the termination date to March 2026. The Duke Energy Registrants, excluding Progress Energy, have borrowing capacity under the Master Credit Facility up to a specified sublimit for each borrower. Duke Energy has the unilateral ability at any time to increase or decrease the borrowing sublimits of each borrower, subject to a maximum sublimit for each borrower. The amount available under the Master Credit Facility has been reduced to backstop issuances of commercial paper, certain letters of credit and variable-rate demand tax-exempt bonds that may be put to the Duke Energy Registrants at the option of the holder.

The table below includes the current borrowing sublimits and available capacity under these credit facilities.

	September 30, 2021
			Duke		Duke		Duke		Duke		Duke		Duke
	Duke		Energy		Energy		Energy		Energy		Energy		Energy
(in millions)	Energy		(Parent)		Carolinas		Progress		Florida		Ohio		Indiana		Piedmont
Facility size(a)	$	8,000	$	2,650	$	1,275	$	1,150	$	850	$	775	$	600	$	700
Reduction to backstop issuances
Commercial paper(b)	(1,611)		389		(375)		(253)		(527)		(419)		(150)		(276)
Outstanding letters of credit	(31)		(25)		(4)		(2)		—		—		—		—
Tax-exempt bonds	(81)		—		—		—		—		—		(81)		—
Available capacity under the Master Credit Facility	$	6,277	$	3,014	$	896	$	895	$	323	$	356	$	369	$	424

(a)Represents the sublimit of each borrower.

(b)Duke Energy issued $625 million of commercial paper and loaned the proceeds through the money pool to Duke Energy Carolinas, Duke Energy Progress, Duke Energy Ohio and Duke Energy Indiana. The balances are classified as Long-Term Debt Payable to Affiliated Companies on the Condensed Consolidated Balance Sheets.

Other Credit Facilities

	September 30, 2021
(in millions)	Facility size		Amount drawn
Duke Energy (Parent) Three-Year Revolving Credit Facility(a)	$	1,000	$	500

(a)During March 2021, Duke Energy extended the maturity date of the Three-Year Revolving Credit Facility from May 2022 to May 2024.

Duke Energy Ohio Term Loan Facility

In October 2021, Duke Energy Ohio entered into a two-year term loan facility with commitments totaling $100 million. Borrowings under the facility will be used to pay down short-term debt and for general corporate purposes. The term loan was fully drawn at the time of closing in October. The balance will be classified as Long-Term Debt on Duke Energy Ohio’s Condensed Consolidated Balance Sheets.

Duke Energy Kentucky Term Loan Facility

In October 2021, Duke Energy Kentucky entered into a two-year term loan facility with commitments totaling $50 million. Borrowings under the facility will be used to pay down short-term debt and for general corporate purposes. The term loan was fully drawn at the time of closing in October. The balance will be classified as Long-Term Debt on Duke Energy Ohio's Condensed Consolidated Balance Sheet.

Duke Energy Indiana Term Loan Facility

In October 2021, Duke Energy Indiana entered into a two-year term loan facility with commitments totaling $300 million. Borrowings under the facility will be used to pay down short-term debt and for general corporate purposes. The term loan was fully drawn at the time of closing in October. The balance will be classified as Long-Term Debt on Duke Energy Indiana’s Condensed Consolidated Balance Sheet.

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Goodwill

9 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

GOODWILL

Duke Energy

The following table presents the goodwill by reportable segment included on Duke Energy's Condensed Consolidated Balance Sheets at September 30, 2021, and December 31, 2020.

	Electric Utilities		Gas Utilities		Commercial
(in millions)	and Infrastructure		and Infrastructure		Renewables		Total
Goodwill balance	$	17,379	$	1,924	$	122	$	19,425
Accumulated impairment charges	—		—		(122)		(122)
Goodwill, adjusted for accumulated impairment charges	$	17,379	$	1,924	$	—	$	19,303

Duke Energy Ohio

Duke Energy Ohio's Goodwill balance of $920 million, allocated $596 million to Electric Utilities and Infrastructure and $324 million to Gas Utilities and Infrastructure, is presented net of accumulated impairment charges of $216 million on the Condensed Consolidated Balance Sheets at September 30, 2021, and December 31, 2020.

Progress Energy

Progress Energy's Goodwill is included in the Electric Utilities and Infrastructure segment and there are no accumulated impairment charges.

Piedmont

Piedmont's Goodwill is included in the Gas Utilities and Infrastructure segment and there are no accumulated impairment charges.

Impairment Testing

Duke Energy, Progress Energy, Duke Energy Ohio and Piedmont are required to perform an annual goodwill impairment test as of the same date each year and, accordingly, perform their annual impairment testing of goodwill as of August 31. Duke Energy, Progress Energy, Duke Energy Ohio and Piedmont update their test between annual tests if events or circumstances occur that would more likely than not reduce the fair value of a reporting unit below its carrying value. As the fair value for Duke Energy, Progress Energy, Duke Energy Ohio and Piedmont exceeded their respective carrying values at the date of the annual impairment analysis, no goodwill impairment charges were recorded in the third quarter of 2021.

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Related Party Transactions

9 Months Ended

Sep. 30, 2021

Related Party Transactions [Abstract]

Related Party Transactions

RELATED PARTY TRANSACTIONS

The Subsidiary Registrants engage in related party transactions in accordance with applicable state and federal commission regulations. Refer to the Condensed Consolidated Balance Sheets of the Subsidiary Registrants for balances due to or due from related parties. Material amounts related to transactions with related parties included on the Condensed Consolidated Statements of Operations and Comprehensive Income are presented in the following table.

	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2021		2020		2021		2020
Duke Energy Carolinas
Corporate governance and shared service expenses(a)	$	207	$	198	$	653	$	528
Indemnification coverages(b)	6		5		18		15
Joint Dispatch Agreement (JDA) revenue(c)	6		6		32		16
JDA expense(c)	68		28		133		72
Intercompany natural gas purchases(d)	14		10		43		26
Progress Energy
Corporate governance and shared service expenses(a)	$	201	$	185	$	615	$	520
Indemnification coverages(b)	10		9		31		27
JDA revenue(c)	68		28		133		72
JDA expense(c)	6		6		32		16
Intercompany natural gas purchases(d)	19		18		56		56
Duke Energy Progress
Corporate governance and shared service expenses(a)	$	121	$	113	$	367	$	301
Indemnification coverages(b)	4		4		14		13
JDA revenue(c)	68		28		133		72
JDA expense(c)	6		6		32		16
Intercompany natural gas purchases(d)	19		18		56		56
Duke Energy Florida
Corporate governance and shared service expenses(a)	$	80	$	72	$	248	$	219
Indemnification coverages(b)	6		5		17		14
Duke Energy Ohio
Corporate governance and shared service expenses(a)	$	79	$	80	$	237	$	241
Indemnification coverages(b)	1		1		3		3
Duke Energy Indiana
Corporate governance and shared service expenses(a)	$	96	$	102	$	302	$	300
Indemnification coverages(b)	2		2		6		6
Piedmont
Corporate governance and shared service expenses(a)	$	32	$	31	$	101	$	102
Indemnification coverages(b)	1		1		3		2
Intercompany natural gas sales(d)	33		28		99		82
Natural gas storage and transportation costs(e)	6		6		17		17

(a)The Subsidiary Registrants are charged their proportionate share of corporate governance and other shared services costs, primarily related to human resources, employee benefits, information technology, legal and accounting fees, as well as other third-party costs. These amounts are primarily recorded in Operation, maintenance and other and Impairment of assets and other charges on the Condensed Consolidated Statements of Operations and Comprehensive Income.

(b)The Subsidiary Registrants incur expenses related to certain indemnification coverages through Bison, Duke Energy’s wholly owned captive insurance subsidiary. These expenses are recorded in Operation, maintenance and other on the Condensed Consolidated Statements of Operations and Comprehensive Income.

(c)Duke Energy Carolinas and Duke Energy Progress participate in a JDA, which allows the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power and expenses from the purchase of power pursuant to the JDA are recorded in Operating Revenues and Fuel used in electric generation and purchased power, respectively, on the Condensed Consolidated Statements of Operations and Comprehensive Income.

(d)Piedmont provides long-term natural gas delivery service to certain Duke Energy Carolinas and Duke Energy Progress natural gas-fired generation facilities. Piedmont records the sales in Operating revenues, and Duke Energy Carolinas and Duke Energy Progress record the related purchases as a component of Fuel used in electric generation and purchased power on their respective Condensed Consolidated Statements of Operations and Comprehensive Income.

(e)Piedmont has related party transactions as a customer of its equity method investments in Pine Needle LNG Company, LLC, Hardy Storage Company, LLC and Cardinal Pipeline Company, LLC natural gas storage and transportation facilities. These expenses are included in Cost of natural gas on Piedmont's Condensed Consolidated Statements of Operations and Comprehensive Income.

In addition to the amounts presented above, the Subsidiary Registrants have other affiliate transactions, including rental of office space, participation in a money pool arrangement, other operational transactions, such as pipeline lease arrangements, and their proportionate share of certain charged expenses. These transactions of the Subsidiary Registrants are incurred in the ordinary course of business and are eliminated in consolidation.

As discussed in Note 11, certain trade receivables have been sold by Duke Energy Ohio and Duke Energy Indiana to CRC, an affiliate formed by a subsidiary of Duke Energy. The proceeds obtained from the sales of receivables are largely cash but do include a subordinated note from CRC for a portion of the purchase price.

Intercompany Income Taxes

Duke Energy and the Subsidiary Registrants file a consolidated federal income tax return and other state and jurisdictional returns. The Subsidiary Registrants have a tax sharing agreement with Duke Energy for the allocation of consolidated tax liabilities and benefits. Income taxes recorded represent amounts the Subsidiary Registrants would incur as separate C-Corporations. The following table includes the balance of intercompany income tax receivables and payables for the Subsidiary Registrants.

	Duke				Duke		Duke		Duke		Duke
	Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
September 30, 2021
Intercompany income tax receivable	$	—	$	36	$	—	$	8	$	1	$	—	$	14
Intercompany income tax payable	133		—		51		—		—		17		—
December 31, 2020
Intercompany income tax receivable	$	—	$	—	$	—	$	—	$	—	$	9	$	10
Intercompany income tax payable	31		33		46		35		2		—		—

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Derivatives and Hedging

9 Months Ended

Sep. 30, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives and Hedging

DERIVATIVES AND HEDGING

The Duke Energy Registrants use commodity and interest rate contracts to manage commodity price risk and interest rate risk. The primary use of commodity derivatives is to hedge the generation portfolio against changes in the prices of electricity and natural gas. Piedmont enters into natural gas supply contracts to provide diversification, reliability and natural gas cost benefits to its customers. Interest rate derivatives are used to manage interest rate risk associated with borrowings.

All derivative instruments not identified as NPNS are recorded at fair value as assets or liabilities on the Condensed Consolidated Balance Sheets. Cash collateral related to derivative instruments executed under master netting arrangements is offset against the collateralized derivatives on the Condensed Consolidated Balance Sheets. The cash impacts of settled derivatives are recorded as operating activities on the Condensed Consolidated Statements of Cash Flows.

INTEREST RATE RISK

The Duke Energy Registrants are exposed to changes in interest rates as a result of their issuance or anticipated issuance of variable-rate and fixed-rate debt and commercial paper. Interest rate risk is managed by limiting variable-rate exposures to a percentage of total debt and by monitoring changes in interest rates. To manage risk associated with changes in interest rates, the Duke Energy Registrants may enter into interest rate swaps, U.S. Treasury lock agreements and other financial contracts. In anticipation of certain fixed-rate debt issuances, a series of forward-starting interest rate swaps or Treasury locks may be executed to lock in components of current market interest rates. These instruments are later terminated prior to or upon the issuance of the corresponding debt.

Cash Flow Hedges

For a derivative designated as hedging the exposure to variable cash flows of a future transaction, referred to as a cash flow hedge, the effective portion of the derivative's gain or loss is initially reported as a component of other comprehensive income and subsequently reclassified into earnings once the future transaction impacts earnings. Amounts for interest rate contracts are reclassified to earnings as interest expense over the term of the related debt. Gains and losses reclassified out of accumulated other comprehensive loss for the three and nine months ended September 30, 2021, and 2020, were not material. Duke Energy's interest rate derivatives designated as hedges include interest rate swaps used to hedge existing debt within the Commercial Renewables segment and forward-starting interest rate swaps not accounted for under regulatory accounting.

Undesignated Contracts

Undesignated contracts primarily include contracts not designated as a hedge because they are accounted for under regulatory accounting or contracts that do not qualify for hedge accounting.

Duke Energy’s interest rate swaps for its regulated operations employ regulatory accounting. With regulatory accounting, the mark-to-market gains or losses on the swaps are deferred as regulatory liabilities or regulatory assets, respectively. Regulatory assets and liabilities are amortized consistent with the treatment of the related costs in the ratemaking process. The accrual of interest on the swaps is recorded as Interest Expense on the Duke Energy Registrant's Condensed Consolidated Statements of Operations and Comprehensive Income.

The following table shows notional amounts of outstanding derivatives related to interest rate risk.

	September 30, 2021
			Duke				Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio
Cash flow hedges	$	2,094	$	—	$	—	$	—	$	—	$	—
Undesignated contracts	1,371		350		900		400		500		27
Total notional amount(a)	$	3,465	$	350	$	900	$	400	$	500	$	27

	December 31, 2020
			Duke				Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio
Cash flow hedges	$	632	$	—	$	—	$	—	$	—	$	—
Undesignated contracts	1,177		400		750		750		—		27
Total notional amount(a)	$	1,809	$	400	$	750	$	750	$	—	$	27

(a)Duke Energy includes amounts related to consolidated VIEs of $594 million in cash flow hedges and $94 million in undesignated contracts as of September 30, 2021, and $632 million in cash flow hedges as of December 31, 2020.

COMMODITY PRICE RISK

The Duke Energy Registrants are exposed to the impact of changes in the prices of electricity purchased and sold in bulk power markets and natural gas purchases, including Piedmont's natural gas supply contracts. Exposure to commodity price risk is influenced by a number of factors including the term of contracts, the liquidity of markets and delivery locations. To manage risk associated with commodity prices, the Duke Energy Registrants may enter into long-term power purchase or sales contracts and long-term natural gas supply agreements.

Cash Flow Hedges

For derivatives designated as hedging the exposure to variable cash flows of a future transaction, referred to as a cash flow hedge, the derivative's gain or loss is initially reported as a component of other comprehensive income and subsequently reclassified into earnings once the future transaction impacts earnings. Gains and losses reclassified out of accumulated other comprehensive loss for the three and nine months ended September 30, 2021, and 2020, were not material. Duke Energy’s commodity derivatives designated as hedges include long-term electricity sales in the Commercial Renewables segment.

Undesignated Contracts

For the Subsidiary Registrants, bulk power electricity and natural gas purchases flow through fuel adjustment clauses, formula-based contracts or other cost-sharing mechanisms. Differences between the costs included in rates and the incurred costs, including undesignated derivative contracts, are largely deferred as regulatory assets or regulatory liabilities. Piedmont policies allow for the use of financial instruments to hedge commodity price risks. The strategy and objective of these hedging programs are to use the financial instruments to reduce natural gas costs volatility for customers.

Volumes

The tables below include volumes of outstanding commodity derivatives. Amounts disclosed represent the absolute value of notional volumes of commodity contracts excluding NPNS. The Duke Energy Registrants have netted contractual amounts where offsetting purchase and sale contracts exist with identical delivery locations and times of delivery. Where all commodity positions are perfectly offset, no quantities are shown.

	September 30, 2021
		Duke		Duke	Duke	Duke
	Duke	Energy	Progress	Energy	Energy	Energy
	Energy	Carolinas	Energy	Progress	Ohio	Indiana	Piedmont
Electricity (GWh)(a)	29,044	—	—	—	3,004	15,881	—
Natural gas (millions of dekatherms)	772	230	190	190	—	7	345

	December 31, 2020
		Duke		Duke	Duke	Duke
	Duke	Energy	Progress	Energy	Energy	Energy
	Energy	Carolinas	Energy	Progress	Ohio	Indiana	Piedmont
Electricity (GWh)(a)	35,409	—	—	—	2,559	10,802	—
Natural gas (millions of dekatherms)	678	145	158	158	—	2	373

(a)Duke Energy includes 10,159 GWh and 22,048 GWh related to cash flow hedges as of September 30, 2021, and December 31, 2020, respectively.

LOCATION AND FAIR VALUE OF DERIVATIVE ASSETS AND LIABILITIES RECOGNIZED ON THE CONDENSED CONSOLIDATED BALANCE SHEETS

The following tables show the fair value and balance sheet location of derivative instruments. Although derivatives subject to master netting arrangements are netted on the Condensed Consolidated Balance Sheets, the fair values presented below are shown gross and cash collateral on the derivatives has not been netted against the fair values shown.

Derivative Assets	September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Commodity Contracts
Not Designated as Hedging Instruments
Current	$	359	$	171	$	135	$	135	$	—	$	4	$	36	$	12
Noncurrent	177		100		78		78		—		—		—		—
Total Derivative Assets – Commodity Contracts	$	536	$	271	$	213	$	213	$	—	$	4	$	36	$	12
Interest Rate Contracts
Designated as Hedging Instruments
Current	$	2	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Noncurrent	3		—		—		—		—		—		—		—
Not Designated as Hedging Instruments
Current	$	2	$	—	$	2	$	2	$	—	$	—	$	—	$	—
Total Derivative Assets – Interest Rate Contracts	$	7	$	—	$	2	$	2	$	—	$	—	$	—	$	—
Total Derivative Assets	$	543	$	271	$	215	$	215	$	—	$	4	$	36	$	12

Derivative Liabilities	September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Commodity Contracts
Designated as Hedging Instruments
Current	$	37	$	—	$	—	$	—	$	—	$	—	$	—	—
Noncurrent	120		—		—		—		—		—		—		—
Not Designated as Hedging Instruments
Current	$	33	$	12	$	—	$	—	$	—	$	—	$	2	$	20
Noncurrent	128		—		—		—		—		—		—		128
Total Derivative Liabilities – Commodity Contracts	$	318	$	12	$	—	$	—	$	—	$	—	$	2	$	148
Interest Rate Contracts
Designated as Hedging Instruments
Current	$	45	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Noncurrent	29		—		—		—		—		—		—		—
Not Designated as Hedging Instruments
Current	19		6		12		—		12		1		—		—
Noncurrent	4		—		—		—		—		4		—		—
Total Derivative Liabilities – Interest Rate Contracts	$	97	$	6	$	12	$	—	$	12	$	5	$	—	$	—
Total Derivative Liabilities	$	415	$	18	$	12	$	—	$	12	$	5	$	2	$	148

Derivative Assets	December 31, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Commodity Contracts
Not Designated as Hedging Instruments
Current	$	30	$	14	$	9	$	9	$	—	$	1	$	6	$	1
Noncurrent	13		6		6		6		—		—		—		—
Total Derivative Assets – Commodity Contracts	$	43	$	20	$	15	$	15	$	—	$	1	$	6	$	1
Interest Rate Contracts
Not Designated as Hedging Instruments
Current	$	18	$	—	$	18	$	18	$	—	$	—	$	—	$	—
Total Derivative Assets – Interest Rate Contracts	$	18	$	—	$	18	$	18	$	—	$	—	$	—	$	—
Total Derivative Assets	$	61	$	20	$	33	$	33	$	—	$	1	$	6	$	1

Derivative Liabilities	December 31, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Commodity Contracts
Designated as Hedging Instruments
Current	$	14	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Noncurrent	70		—		—		—		—		—		—		—
Not Designated as Hedging Instruments
Current	$	30	$	13	$	2	$	2	$	—	$	—	$	1	$	15
Noncurrent	137		3		27		12		—		—		—		107
Total Derivative Liabilities – Commodity Contracts	$	251	$	16	$	29	$	14	$	—	$	—	$	1	$	122
Interest Rate Contracts
Designated as Hedging Instruments
Current	$	15	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Noncurrent	48		—		—		—		—		—		—		—
Not Designated as Hedging Instruments
Current	5		4		—		—		—		1		—		—
Noncurrent	5		—		—		—		—		5		—		—
Total Derivative Liabilities – Interest Rate Contracts	$	73	$	4	$	—	$	—	$	—	$	6	$	—	$	—
Total Derivative Liabilities	$	324	$	20	$	29	$	14	$	—	$	6	$	1	$	122

OFFSETTING ASSETS AND LIABILITIES

The following tables present the line items on the Condensed Consolidated Balance Sheets where derivatives are reported. Substantially all of Duke Energy's outstanding derivative contracts are subject to enforceable master netting arrangements. The gross amounts offset in the tables below show the effect of these netting arrangements on financial position, and include collateral posted to offset the net position. The amounts shown are calculated by counterparty. Accounts receivable or accounts payable may also be available to offset exposures in the event of bankruptcy. These amounts are not included in the tables below.

Derivative Assets	September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Current
Gross amounts recognized	$	363	$	171	$	137	$	137	$	—	$	4	$	36	$	12
Gross amounts offset	(143)		(87)		(56)		(56)		—		—		—		—
Net amounts presented in Current Assets: Other	$	220	$	84	$	81	$	81	$	—	$	4	$	36	$	12
Noncurrent
Gross amounts recognized	$	180	$	100	$	78	$	78	$	—	$	—	$	—	$	—
Gross amounts offset	(71)		(45)		(26)		(26)		—		—		—		—
Net amounts presented in Other Noncurrent Assets: Other	$	109	$	55	$	52	$	52	$	—	$	—	$	—	$	—

Derivative Liabilities	September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Current
Gross amounts recognized	$	134	$	18	$	12	$	—	$	12	$	1	$	2	$	20
Gross amounts offset	—		—		—		—		—		—		—		—
Net amounts presented in Current Liabilities: Other	$	134	$	18	$	12	$	—	$	12	$	1	$	2	$	20
Noncurrent
Gross amounts recognized	$	281	$	—	$	—	$	—	$	—	$	4	$	—	$	128
Gross amounts offset	—		—		—		—		—		—		—		—
Net amounts presented in Other Noncurrent Liabilities: Other	$	281	$	—	$	—	$	—	$	—	$	4	$	—	$	128

Derivative Assets	December 31, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Current
Gross amounts recognized	$	48	$	14	$	27	$	27	$	—	$	1	$	6	$	1
Gross amounts offset	(3)		(2)		(2)		(2)		—		—		—		—
Net amounts presented in Current Assets: Other	$	45	$	12	$	25	$	25	$	—	$	1	$	6	$	1
Noncurrent
Gross amounts recognized	$	13	$	6	$	6	$	6	$	—	$	—	$	—	$	—
Gross amounts offset	(5)		(1)		(4)		(4)		—		—		—		—
Net amounts presented in Other Noncurrent Assets: Other	$	8	$	5	$	2	$	2	$	—	$	—	$	—	$	—

Derivative Liabilities	December 31, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Current
Gross amounts recognized	$	64	$	17	$	2	$	2	$	—	$	1	$	1	$	15
Gross amounts offset	(3)		(2)		(2)		(2)		—		—		—		—
Net amounts presented in Current Liabilities: Other	$	61	$	15	$	—	$	—	$	—	$	1	$	1	$	15
Noncurrent
Gross amounts recognized	$	260	$	3	$	27	$	12	$	—	$	5	$	—	$	107
Gross amounts offset	(5)		(1)		(4)		(4)		—		—		—		—
Net amounts presented in Other Noncurrent Liabilities: Other	$	255	$	2	$	23	$	8	$	—	$	5	$	—	$	107

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Investments in Debt and Equity Securities

9 Months Ended

Sep. 30, 2021

Investments, Debt and Equity Securities [Abstract]

Investments In Debt And Equity Securities

INVESTMENTS IN DEBT AND EQUITY SECURITIES

Duke Energy’s investments in debt and equity securities are primarily comprised of investments held in (i) the NDTF at Duke Energy Carolinas, Duke Energy Progress and Duke Energy Florida, (ii) the grantor trusts at Duke Energy Progress, Duke Energy Florida and Duke Energy Indiana related to OPEB plans and (iii) Bison. The Duke Energy Registrants classify investments in debt securities as AFS and investments in equity securities as fair value through net income (FV-NI).

For investments in debt securities classified as AFS, the unrealized gains and losses are included in other comprehensive income until realized, at which time they are reported through net income. For investments in equity securities classified as FV-NI, both realized and unrealized gains and losses are reported through net income. Substantially all of Duke Energy’s investments in debt and equity securities qualify for regulatory accounting, and accordingly, all associated realized and unrealized gains and losses on these investments are deferred as a regulatory asset or liability.

Duke Energy classifies the majority of investments in debt and equity securities as long term, unless otherwise noted.

Investment Trusts

The investments within the Investment Trusts are managed by independent investment managers with discretion to buy, sell and invest pursuant to the objectives set forth by the investment manager agreements and trust agreements. The Duke Energy Registrants have limited oversight of the day-to-day management of these investments. As a result, the ability to hold investments in unrealized loss positions is outside the control of the Duke Energy Registrants. Accordingly, all unrealized losses associated with debt securities within the Investment Trusts are recognized immediately and deferred to regulatory accounts where appropriate.

Other AFS Securities

Unrealized gains and losses on all other AFS securities are included in other comprehensive income until realized, unless it is determined the carrying value of an investment has a credit loss. The Duke Energy Registrants analyze all investment holdings each reporting period to determine whether a decline in fair value is related to a credit loss. If a credit loss exists, the unrealized credit loss is included in earnings. There were no material credit losses as of September 30, 2021, and December 31, 2020.

Other Investments amounts are recorded in Other within Other Noncurrent Assets on the Condensed Consolidated Balance Sheets.

DUKE ENERGY

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	164	$	—	$	—	$	177
Equity securities	4,700		35		6,754		4,138		54		6,235
Corporate debt securities	44		5		847		76		1		806
Municipal bonds	13		1		296		22		—		370
U.S. government bonds	34		8		1,605		51		—		1,361
Other debt securities	4		1		195		8		—		180
Total NDTF Investments	$	4,795	$	50	$	9,861	$	4,295	$	55	$	9,129
Other Investments
Cash and cash equivalents	$	—	$	—	$	87	$	—	$	—	$	127
Equity securities	83		—		145		79		—		146
Corporate debt securities	4		1		130		8		—		110
Municipal bonds	3		1		69		5		—		86
U.S. government bonds	—		—		50		—		—		42
Other debt securities	—		—		34		—		—		47
Total Other Investments	$	90	$	2	$	515	$	92	$	—	$	558
Total Investments	$	4,885	$	52	$	10,376	$	4,387	$	55	$	9,687

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2021, and 2020, were as follows.

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
FV-NI:
Realized gains	$	34	$	13	$	320	$	338
Realized losses	40		16		100		148
AFS:
Realized gains	17		26		51		73
Realized losses	15		19		46		38

DUKE ENERGY CAROLINAS

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	60	$	—	$	—	$	30
Equity securities	2,725		14		3,912		2,442		23		3,685
Corporate debt securities	27		3		495		49		1		510
Municipal bonds	1		—		24		6		—		91
U.S. government bonds	18		2		752		25		—		475
Other debt securities	4		1		190		7		—		174
Total NDTF Investments	$	2,775	$	20	$	5,433	$	2,529	$	24	$	4,965

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2021, and 2020, were as follows.

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
FV-NI:
Realized gains	$	25	$	10	$	243	$	46
Realized losses	29		12		68		82
AFS:
Realized gains	10		20		35		50
Realized losses	10		17		32		30

PROGRESS ENERGY

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	104	$	—	$	—	$	147
Equity securities	1,975		21		2,842		1,696		31		2,550
Corporate debt securities	17		2		352		27		—		296
Municipal bonds	12		1		272		16		—		279
U.S. government bonds	16		6		853		26		—		886
Other debt securities	—		—		5		1		—		6
Total NDTF Investments	$	2,020	$	30	$	4,428	$	1,766	$	31	$	4,164
Other Investments
Cash and cash equivalents	$	—	$	—	$	18	$	—	$	—	$	106
Municipal bonds	2		—		26		3		—		26
Total Other Investments	$	2	$	—	$	44	$	3	$	—	$	132
Total Investments	$	2,022	$	30	$	4,472	$	1,769	$	31	$	4,296

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2021, and 2020, were as follows.

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
FV-NI:
Realized gains	$	9	$	3	$	77	$	292
Realized losses	11		4		32		66
AFS:
Realized gains	7		6		14		17
Realized losses	6		2		12		7

DUKE ENERGY PROGRESS

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	92	$	—	$	—	$	76
Equity securities	1,882		21		2,736		1,617		31		2,459
Corporate debt securities	17		2		287		27		—		296
Municipal bonds	12		1		272		16		—		279
U.S. government bonds	16		2		466		26		—		412
Other debt securities	—		—		5		1		—		6
Total NDTF Investments	$	1,927	$	26	$	3,858	$	1,687	$	31	$	3,528
Other Investments
Cash and cash equivalents	$	—	$	—	$	16	$	—	$	—	$	1
Total Other Investments	$	—	$	—	$	16	$	—	$	—	$	1
Total Investments	$	1,927	$	26	$	3,874	$	1,687	$	31	$	3,529

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2021, and 2020, were as follows.

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
FV-NI:
Realized gains	$	9	$	3	$	76	$	43
Realized losses	11		4		31		51
AFS:
Realized gains	6		6		13		17
Realized losses	5		2		11		7

DUKE ENERGY FLORIDA

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	12	$	—	$	—	$	71
Equity securities	93		—		106		79		—		91
Corporate debt securities	—		—		65		—		—		—
U.S. government bonds	—		4		387		—		—		474
Total NDTF Investments(a)	$	93	$	4	$	570	$	79	$	—	$	636
Other Investments
Cash and cash equivalents	$	—	$	—	$	1	$	—	$	—	$	1
Municipal bonds	2		—		26		3		—		26
Total Other Investments	$	2	$	—	$	27	$	3	$	—	$	27
Total Investments	$	95	$	4	$	597	$	82	$	—	$	663

(a)During the nine months ended September 30, 2021, and the year ended December 31, 2020, Duke Energy Florida received reimbursements from the NDTF for costs related to ongoing decommissioning activity of Crystal River Unit 3.

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2021, and 2020, were as follows:

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
FV-NI:
Realized gains	$	—	$	—	$	1	$	249
Realized losses	—		—		1		15
AFS:
Realized gains	1		—		1		—
Realized losses	1		—		1		—

DUKE ENERGY INDIANA

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are measured at FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
Investments
Cash and cash equivalents	$	—	$	—	$	19	$	—	$	—	$	1
Equity securities	56		—		90		58		—		97
Corporate debt securities	—		—		5		—		—		3
Municipal bonds	1		1		36		1		—		38
U.S. government bonds	—		—		5		—		—		4
Total Investments	$	57	$	1	$	155	$	59	$	—	$	143

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2021, and 2020, were immaterial.

DEBT SECURITY MATURITIES

The table below summarizes the maturity date for debt securities.

	September 30, 2021
			Duke				Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Indiana
Due in one year or less	$	151	$	3	$	121	$	22	$	99	$	5
Due after one through five years	954		343		548		244		304		18
Due after five through 10 years	639		268		286		247		39		8
Due after 10 years	1,482		847		553		517		36		15
Total	$	3,226	$	1,461	$	1,508	$	1,030	$	478	$	46

XML

Fair Value Measurements

9 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Fair Value Measurements

FAIR VALUE MEASUREMENTS

Fair value is the exchange price to sell an asset or transfer a liability in an orderly transaction between market participants at the measurement date. The fair value definition focuses on an exit price versus the acquisition cost. Fair value measurements use market data or assumptions market participants would use in pricing the asset or liability, including assumptions about risk and the risks inherent in the inputs to the valuation technique. These inputs may be readily observable, corroborated by market data or generally unobservable. Valuation techniques maximize the use of observable inputs and minimize use of unobservable inputs. A midmarket pricing convention (the midpoint price between bid and ask prices) is permitted for use as a practical expedient.

Fair value measurements are classified in three levels based on the fair value hierarchy as defined by GAAP. Certain investments are not categorized within the fair value hierarchy. These investments are measured at fair value using the net asset value (NAV) per share practical expedient. The NAV is derived based on the investment cost, less any impairment, plus or minus changes resulting from observable price changes for an identical or similar investment of the same issuer.

Fair value accounting guidance permits entities to elect to measure certain financial instruments that are not required to be accounted for at fair value, such as equity method investments or the company’s own debt, at fair value. The Duke Energy Registrants have not elected to record any of these items at fair value.

Valuation methods of the primary fair value measurements disclosed below are as follows.

Investments in equity securities

The majority of investments in equity securities are valued using Level 1 measurements. Investments in equity securities are typically valued at the closing price in the principal active market as of the last business day of the quarter. Principal active markets for equity prices include published exchanges such as the New York Stock Exchange and Nasdaq Stock Market. Foreign equity prices are translated from their trading currency using the currency exchange rate in effect at the close of the principal active market. There was no after-hours market activity that was required to be reflected in the reported fair value measurements.

Investments in debt securities

Most investments in debt securities are valued using Level 2 measurements because the valuations use interest rate curves and credit spreads applied to the terms of the debt instrument (maturity and coupon interest rate) and consider the counterparty credit rating. If the market for a particular fixed-income security is relatively inactive or illiquid, the measurement is Level 3.

Commodity derivatives

Commodity derivatives with clearinghouses are classified as Level 1. Commodity derivatives with observable forward curves are classified as Level 2. If forward price curves are not observable for the full term of the contract and the unobservable period had more than an insignificant impact on the valuation, the commodity derivative is classified as Level 3. In isolation, increases (decreases) in natural gas forward prices result in favorable (unfavorable) fair value adjustments for natural gas purchase contracts; and increases (decreases) in electricity forward prices result in unfavorable (favorable) fair value adjustments for electricity sales contracts. Duke Energy regularly evaluates and validates pricing inputs used to estimate the fair value of natural gas commodity contracts by a market participant price verification procedure. This procedure provides a comparison of internal forward commodity curves to market participant generated curves.

Interest rate derivatives

Most over-the-counter interest rate contract derivatives are valued using financial models that utilize observable inputs for similar instruments and are classified as Level 2. Inputs include forward interest rate curves, notional amounts, interest rates and credit quality of the counterparties.

Other fair value considerations

See Note 11 in Duke Energy's Annual Report on Form 10-K for the year ended December 31, 2020, for a discussion of the valuation of goodwill and intangible assets.

DUKE ENERGY

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. Derivative amounts in the tables below for all Duke Energy Registrants exclude cash collateral, which is disclosed in Note 8. See Note 9 for additional information related to investments by major security type for the Duke Energy Registrants.

	September 30, 2021
(in millions)	Total Fair Value		Level 1		Level 2		Level 3		Not Categorized
NDTF cash and cash equivalents	$	164	$	164	$	—	$	—	$	—
NDTF equity securities	6,754		6,705		—		—		49
NDTF debt securities	2,943		998		1,945		—		—
Other equity securities	145		145		—		—		—
Other debt securities	283		45		238		—		—
Other cash and cash equivalents	87		87		—		—		—
Derivative assets	543		27		490		26		—
Total assets	10,919		8,171		2,673		26		49
Derivative liabilities	(415)		(2)		(256)		(157)		—
Net assets (liabilities)	$	10,504	$	8,169	$	2,417	$	(131)	$	49

	December 31, 2020
(in millions)	Total Fair Value		Level 1		Level 2		Level 3		Not Categorized
NDTF cash and cash equivalents	$	177	$	177	$	—	$	—	$	—
NDTF equity securities	6,235		6,189		—		—		46
NDTF debt securities	2,717		874		1,843		—		—
Other equity securities	146		146		—		—		—
Other debt securities	285		37		248		—		—
Other cash and cash equivalents	127		127		—		—		—
Derivative assets	61		1		53		7		—
Total assets	9,748		7,551		2,144		7		46
Derivative liabilities	(324)		—		(240)		(84)		—
Net assets (liabilities)	$	9,424	$	7,551	$	1,904	$	(77)	$	46

The following tables provide reconciliations of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements.

	Derivatives (net)
	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2021		2020		2021		2020
Balance at beginning of period	$	(131)	$	(92)	$	(77)	$	(102)
Total pretax realized or unrealized losses included in comprehensive income	(11)		(102)		(86)		(102)
Purchases, sales, issuances and settlements:
Purchases	—		—		21		14
Settlements	4		(3)		(4)		(18)
Total gains (losses) included on the Condensed Consolidated Balance Sheet	7		(6)		15		5
Balance at end of period	$	(131)	$	(203)	$	(131)	$	(203)

DUKE ENERGY CAROLINAS

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.

	September 30, 2021
(in millions)	Total Fair Value		Level 1		Level 2		Not Categorized
NDTF cash and cash equivalents	$	60	$	60	$	—	$	—
NDTF equity securities	3,912		3,863		—		49
NDTF debt securities	1,461		359		1,102		—
Derivative assets	271		—		271		—
Total assets	5,704		4,282		1,373		49
Derivative liabilities	(18)		—		(18)		—
Net assets	$	5,686	$	4,282	$	1,355	$	49

	December 31, 2020
(in millions)	Total Fair Value		Level 1		Level 2		Not Categorized
NDTF cash and cash equivalents	$	30	$	30	$	—	$	—
NDTF equity securities	3,685		3,639		—		46
NDTF debt securities	1,250		192		1,058		—
Derivative assets	20		—		20		—
Total assets	4,985		3,861		1,078		46
Derivative liabilities	(20)		—		(20)		—
Net assets	$	4,965	$	3,861	$	1,058	$	46

PROGRESS ENERGY

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.

	September 30, 2021						December 31, 2020
(in millions)	Total Fair Value		Level 1		Level 2		Total Fair Value		Level 1		Level 2
NDTF cash and cash equivalents	$	104	$	104	$	—	$	147	$	147	$	—
NDTF equity securities	2,842		2,842		—		2,550		2,550		—
NDTF debt securities	1,482		639		843		1,467		682		785
Other debt securities	26		—		26		26		—		26
Other cash and cash equivalents	18		18		—		106		106		—
Derivative assets	215		—		215		33		—		33
Total assets	4,687		3,603		1,084		4,329		3,485		844
Derivative liabilities	(12)		—		(12)		(29)		—		(29)
Net assets	$	4,675	$	3,603	$	1,072	$	4,300	$	3,485	$	815

DUKE ENERGY PROGRESS

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.

	September 30, 2021						December 31, 2020
(in millions)	Total Fair Value		Level 1		Level 2		Total Fair Value		Level 1		Level 2
NDTF cash and cash equivalents	$	92	$	92	$	—	$	76	$	76	$	—
NDTF equity securities	2,736		2,736		—		2,459		2,459		—
NDTF debt securities	1,030		278		752		993		237		756
Other cash and cash equivalents	16		16		—		1		1		—
Derivative assets	215		—		215		33		—		33
Total assets	4,089		3,122		967		3,562		2,773		789
Derivative liabilities	—		—		—		(14)		—		(14)
Net assets	$	4,089	$	3,122	$	967	$	3,548	$	2,773	$	775

DUKE ENERGY FLORIDA

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.

	September 30, 2021						December 31, 2020
(in millions)	Total Fair Value		Level 1		Level 2		Total Fair Value		Level 1		Level 2
NDTF cash and cash equivalents	$	12	$	12	$	—	$	71	$	71	$	—
NDTF equity securities	106		106		—		91		91		—
NDTF debt securities	452		361		91		474		445		29
Other debt securities	26		—		26		26		—		26
Other cash and cash equivalents	1		1		—		1		1		—
Total assets	597		480		117		663		608		55
Derivative liabilities	(12)		—		(12)		—		—		—
Net assets	$	585	$	480	$	105	$	663	$	608	$	55

DUKE ENERGY OHIO

The recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets were not material at September 30, 2021, and December 31, 2020.

DUKE ENERGY INDIANA

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.

	September 30, 2021								December 31, 2020
(in millions)	Total Fair Value		Level 1		Level 2		Level 3		Total Fair Value		Level 1		Level 2		Level 3
Other equity securities	$	90	$	90	$	—	$	—	$	97	$	97	$	—	$	—
Other debt securities	46		—		46		—		45		—		45		—
Other cash and cash equivalents	19		19		—		—		1		1		—		—
Derivative assets	36		12		—		24		6		—		—		6
Total assets	191		121		46		24		149		98		45		6
Derivative liabilities	(2)		(2)		—		—		(1)		(1)		—		—
Net assets	$	189	$	119	$	46	$	24	$	148	$	97	$	45	$	6

The following table provides a reconciliation of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements.

	Derivatives (net)
	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2021		2020		2021		2020
Balance at beginning of period	$	22	$	10	$	6	$	11
Purchases, sales, issuances and settlements:
Purchases	—		—		18		10
Settlements	(3)		(3)		(12)		(13)
Total gains included on the Condensed Consolidated Balance Sheet	5		1		12		—
Balance at end of period	$	24	$	8	$	24	$	8

PIEDMONT

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.

	September 30, 2021						December 31, 2020
(in millions)	Total Fair Value		Level 1		Level 2		Total Fair Value		Level 1		Level 2
Derivative assets	$	12	$	12	$	—	$	1	$	1	$	—
Derivative liabilities	(148)		—		(148)		(122)		—		(122)
Net (liabilities) assets	$	(136)	$	12	$	(148)	$	(121)	$	1	$	(122)

The following table provides a reconciliation of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements.

	Derivatives (net)
	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2021		2020		2021		2020
Balance at beginning of period	$	—	$	(105)	$	—	$	(117)
Total (losses) gains and settlements	—		(6)		—		6
Balance at end of period	$	—	$	(111)	$	—	$	(111)

QUANTITATIVE INFORMATION ABOUT UNOBSERVABLE INPUTS

The following tables include quantitative information about the Duke Energy Registrants' derivatives classified as Level 3.

	September 30, 2021
										Weighted
	Fair Value									Average
Investment Type	(in millions)		Valuation Technique	Unobservable Input	Range					Range
Duke Energy
Electricity contracts	$	(157)	RTO forward pricing	Forward electricity curves – price per MWh	$	18.02	-	$	143.85	$	38.43
Duke Energy Ohio
FTRs	2		RTO auction pricing	FTR price – per MWh	0.06		-	1.27		0.71
Duke Energy Indiana
FTRs	24		RTO auction pricing	FTR price – per MWh	(1.11)		-	8.55		1.61
Duke Energy
Total Level 3 derivatives	$	(131)

	December 31, 2020
									Weighted
	Fair Value								Average
Investment Type	(in millions)		Valuation Technique	Unobservable Input	Range				Range
Duke Energy
Electricity contracts	$	(84)	Discounted cash flow	Forward electricity curves – price per MWh	$	14.68	-	$151.84	$28.84
Duke Energy Ohio
FTRs	1		RTO auction pricing	FTR price – per MWh	0.25		-	1.68	0.79
Duke Energy Indiana
FTRs	6		RTO auction pricing	FTR price – per MWh	(2.40)		-	7.41	1.05
Duke Energy
Total Level 3 derivatives	$	(77)

OTHER FAIR VALUE DISCLOSURES

The fair value and book value of long-term debt, including current maturities, is summarized in the following table. Estimates determined are not necessarily indicative of amounts that could have been settled in current markets. Fair value of long-term debt uses Level 2 measurements.

	September 30, 2021				December 31, 2020
(in millions)	Book Value		Fair Value		Book Value		Fair Value
Duke Energy(a)	$	62,802	$	69,381	$	59,863	$	69,292
Duke Energy Carolinas	12,975		14,964		12,218		14,917
Progress Energy	19,488		22,593		19,264		23,470
Duke Energy Progress	9,848		10,915		9,258		10,862
Duke Energy Florida	7,549		8,932		7,915		9,756
Duke Energy Ohio	3,092		3,517		3,089		3,650
Duke Energy Indiana	4,092		4,883		4,091		5,204
Piedmont	2,968		3,320		2,780		3,306

(a)Book value of long-term debt includes $1.3 billion at September 30, 2021, and December 31, 2020, of net unamortized debt discount and premium of purchase accounting adjustments related to the mergers with Progress Energy and Piedmont that are excluded from fair value of long-term debt.

At both September 30, 2021, and December 31, 2020, fair value of cash and cash equivalents, accounts and notes receivable, accounts payable, notes payable and commercial paper and nonrecourse notes payable of VIEs are not materially different from their carrying amounts because of the short-term nature of these instruments and/or because the stated rates approximate market rates.

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Variable Interest Entities

9 Months Ended

Sep. 30, 2021

Variable Interest Entities [Abstract]

Variable Interest Entities

VARIABLE INTEREST ENTITIES

CONSOLIDATED VIEs

The obligations of the consolidated VIEs discussed in the following paragraphs are nonrecourse to the Duke Energy Registrants. The registrants have no requirement to provide liquidity to, purchase assets of or guarantee performance of these VIEs unless noted in the following paragraphs.

No financial support was provided to any of the consolidated VIEs during the nine months ended September 30, 2021, and the year ended December 31, 2020, or is expected to be provided in the future that was not previously contractually required.

Receivables Financing – DERF/DEPR/DEFR

DERF, DEPR and DEFR are bankruptcy remote, special purpose subsidiaries of Duke Energy Carolinas, Duke Energy Progress and Duke Energy Florida, respectively. DERF, DEPR and DEFR are wholly owned LLCs with separate legal existence from their parent companies, and their assets are not generally available to creditors of their parent companies. On a revolving basis, DERF, DEPR and DEFR buy certain accounts receivable arising from the sale of electricity and related services from their parent companies.

DERF, DEPR and DEFR borrow amounts under credit facilities to buy these receivables. Borrowing availability from the credit facilities is limited to the amount of qualified receivables purchased, which generally exclude receivables past due more than a predetermined number of days and reserves for expected past-due balances. The sole source of funds to satisfy the related debt obligations is cash collections from the receivables. Amounts borrowed under the credit facilities for DERF and DEPR are reflected on the Condensed Consolidated Balance Sheets as Long-Term Debt. Amounts borrowed under the credit facilities for DEFR are reflected on the Condensed Consolidated Balance Sheets as Current maturities of long-term debt.

The most significant activity that impacts the economic performance of DERF, DEPR and DEFR are the decisions made to manage delinquent receivables. Duke Energy Carolinas, Duke Energy Progress and Duke Energy Florida are considered the primary beneficiaries and consolidate DERF, DEPR and DEFR, respectively, as they make those decisions.

Receivables Financing – CRC

CRC is a bankruptcy remote, special purpose entity indirectly owned by Duke Energy. On a revolving basis, CRC buys certain accounts receivable arising from the sale of electricity, natural gas and related services from Duke Energy Ohio and Duke Energy Indiana. CRC borrows amounts under a credit facility to buy the receivables from Duke Energy Ohio and Duke Energy Indiana. Borrowing availability from the credit facility is limited to the amount of qualified receivables sold to CRC, which generally exclude receivables past due more than a predetermined number of days and reserves for expected past-due balances. The sole source of funds to satisfy the related debt obligation is cash collections from the receivables. Amounts borrowed under the credit facility are reflected on Duke Energy's Condensed Consolidated Balance Sheets as Long-Term Debt.

The proceeds Duke Energy Ohio and Duke Energy Indiana receive from the sale of receivables to CRC are approximately 75% cash and 25% in the form of a subordinated note from CRC. The subordinated note is a retained interest in the receivables sold. Depending on collection experience, additional equity infusions to CRC may be required by Duke Energy to maintain a minimum equity balance of $3 million.

CRC is considered a VIE because (i) equity capitalization is insufficient to support its operations, (ii) power to direct the activities that most significantly impact the economic performance of the entity is not held by the equity holder and (iii) deficiencies in net worth of CRC are funded by Duke Energy. The most significant activities that impact the economic performance of CRC are decisions made to manage delinquent receivables. Duke Energy is considered the primary beneficiary and consolidates CRC as it makes these decisions. Neither Duke Energy Ohio nor Duke Energy Indiana consolidate CRC.

Receivables Financing – Credit Facilities

The following table summarizes the amounts and expiration dates of the credit facilities and associated restricted receivables described above.

	Duke Energy
			Duke Energy		Duke Energy		Duke Energy
			Carolinas		Progress		Florida
(in millions)	CRC		DERF		DEPR		DEFR
Expiration date	February 2023		December 2022		April 2023		April 2023
Credit facility amount	$	350	$	475	$	350	$	250
Amounts borrowed at September 30, 2021	350		475		350		250
Amounts borrowed at December 31, 2020	350		364		250		250
Restricted Receivables at September 30, 2021	535		915		532		443
Restricted Receivables at December 31, 2020	547		696		500		397

Nuclear Asset-Recovery Bonds – DEFPF

DEFPF is a bankruptcy remote, wholly owned special purpose subsidiary of Duke Energy Florida. DEFPF was formed in 2016 for the sole purpose of issuing nuclear asset-recovery bonds to finance Duke Energy Florida's unrecovered regulatory asset related to Crystal River Unit 3.

In 2016, DEFPF issued senior secured bonds and used the proceeds to acquire nuclear asset-recovery property from Duke Energy Florida. The nuclear asset-recovery property acquired includes the right to impose, bill, collect and adjust a non-bypassable nuclear asset-recovery charge from all Duke Energy Florida retail customers until the bonds are paid in full and all financing costs have been recovered. The nuclear asset-recovery bonds are secured by the nuclear asset-recovery property and cash collections from the nuclear asset-recovery charges are the sole source of funds to satisfy the debt obligation. The bondholders have no recourse to Duke Energy Florida.

DEFPF is considered a VIE primarily because the equity capitalization is insufficient to support its operations. Duke Energy Florida has the power to direct the significant activities of the VIE as described above and therefore Duke Energy Florida is considered the primary beneficiary and consolidates DEFPF.

The following table summarizes the impact of DEFPF on Duke Energy Florida's Condensed Consolidated Balance Sheets.

(in millions)	September 30, 2021		December 31, 2020
Receivables of VIEs	$	6	$	4
Regulatory Assets: Current	54		53
Current Assets: Other	17		39
Other Noncurrent Assets: Regulatory assets	896		937
Current Liabilities: Other	2		10
Current maturities of long-term debt	56		55
Long-Term Debt	946		1,002

Commercial Renewables

Certain of Duke Energy’s renewable energy facilities are VIEs due to Duke Energy issuing guarantees for debt service and operations and maintenance reserves in support of debt financings. Assets are restricted and cannot be pledged as collateral or sold to third parties without prior approval of debt holders. Additionally, Duke Energy has VIEs associated with tax equity arrangements entered into with third-party investors in order to finance the cost of renewable assets eligible for tax credits. The activities that most significantly impacted the economic performance of these renewable energy facilities were decisions associated with siting, negotiating PPAs and Engineering, Procurement and Construction agreements, and decisions associated with ongoing operations and maintenance-related activities. Duke Energy is considered the primary beneficiary and consolidates the entities as it is responsible for all of these decisions.

The table below presents material balances reported on Duke Energy's Condensed Consolidated Balance Sheets related to Commercial Renewables VIEs.

(in millions)	September 30, 2021		December 31, 2020
Current Assets: Other	$	330	$	257
Property, Plant and Equipment: Cost	7,315		6,394
Accumulated depreciation and amortization	(1,414)		(1,242)
Other Noncurrent Assets: Other	110		67
Current maturities of long-term debt	165		167
Long-Term Debt	1,552		1,569
Other Noncurrent Liabilities: AROs	167		148
Other Noncurrent Liabilities: Other	341		316

NON-CONSOLIDATED VIEs

The following tables summarize the impact of non-consolidated VIEs on the Condensed Consolidated Balance Sheets.

	September 30, 2021
	Duke Energy						Duke		Duke
	Pipeline		Commercial				Energy		Energy
(in millions)	Investments		Renewables		Total		Ohio		Indiana
Receivables from affiliated companies	$	—	$	—	$	—	$	47	$	77
Investments in equity method unconsolidated affiliates	15		465		480		—		—
Deferred tax asset	58		—		58		—		—
Total assets	$	73	$	465	$	538	$	47	$	77
Other current liabilities	61		3		64		—		—
Other noncurrent liabilities	63		3		66		—		—
Total liabilities	$	124	$	6	$	130	$	—	$	—
Net (liabilities) assets	$	(51)	$	459	$	408	$	47	$	77

	December 31, 2020
	Duke Energy						Duke		Duke
	Pipeline		Commercial				Energy		Energy
(in millions)	Investments		Renewables		Total		Ohio		Indiana
Receivables from affiliated companies	$	—	$	—	$	—	$	83	$	110
Investments in equity method unconsolidated affiliates	—		530		530		—		—
Other noncurrent assets	31		—		31		—		—
Total assets	$	31	$	530	$	561	$	83	$	110
Other current liabilities	928		5		933		—		—
Other noncurrent liabilities	8		10		18		—		—
Total liabilities	$	936	$	15	$	951	$	—	$	—
Net assets (liabilities)	$	(905)	$	515	$	(390)	$	83	$	110

The Duke Energy Registrants are not aware of any situations where the maximum exposure to loss significantly exceeds the carrying values shown above except for certain renewable energy project entities guarantees for debt services and operations and maintenance, as discussed below.

Pipeline Investments

Duke Energy has investments in various joint ventures to construct and operate pipeline projects. These entities are considered VIEs due to having insufficient equity to finance their own activities without subordinated financial support. Duke Energy does not have the power to direct the activities that most significantly impact the economic performance, the obligation to absorb losses or the right to receive benefits of these VIEs and therefore does not consolidate these entities.

Duke Energy has a 47% ownership interest in ACP. For the three and nine months ended September 30, 2020, the ACP investment was considered a significant subsidiary because its loss exceeded 10% of Duke Energy’s income. ACP's net loss for the three and nine months ended September 30, 2020, was $163 million and $4,505 million, respectively.

In 2020, Duke Energy determined that it would no longer invest in the construction of the ACP pipeline. In February 2021, Duke Energy paid approximately $855 million to fund ACP's outstanding debt, relieving Duke Energy of its guarantee. See Notes 1 and 3 for further information regarding this transaction.

Commercial Renewables

Duke Energy has investments in various renewable energy project entities. Duke Energy has a 50% ownership in a VIE, which owns a portfolio of wind projects. This entity is a VIE as a result of Duke Energy issuing guarantees for debt service and operations and maintenance reserves in support of debt financings. Duke Energy does not consolidate this VIE because power to direct and control key activities is shared jointly by Duke Energy and the other owner. Duke Energy also has equity ownership in an entity, which owns a portfolio of fuel cell projects. Duke Energy does not consolidate the fuel cell portfolio as it does not have the power to direct the activities that most significantly impact the economic performance of the entity.

OVEC

Duke Energy Ohio’s 9% ownership interest in OVEC is considered a non-consolidated VIE due to OVEC having insufficient equity to finance its activities without subordinated financial support. The activities that most significantly impact OVEC's economic performance include fuel strategy and supply activities and decisions associated with ongoing operations and maintenance-related activities. Duke Energy Ohio does not have the unilateral power to direct these activities, and therefore, does not consolidate OVEC.

As a counterparty to an Inter-Company Power Agreement (ICPA), Duke Energy Ohio has a contractual arrangement to receive entitlements to capacity and energy from OVEC’s power plants through June 2040 commensurate with its power participation ratio, which is equivalent to Duke Energy Ohio's ownership interest. Costs, including fuel, operating expenses, fixed costs, debt amortization and interest expense, are allocated to counterparties to the ICPA based on their power participation ratio. The value of the ICPA is subject to variability due to fluctuation in power prices and changes in OVEC's cost of business. Duke Energy cannot predict the outcome in this matter. See Note 3 for additional information.

CRC

See discussion under Consolidated VIEs for additional information related to CRC.

Amounts included in Receivables from affiliated companies in the above table for Duke Energy Ohio and Duke Energy Indiana reflect their retained interest in receivables sold to CRC. These subordinated notes held by Duke Energy Ohio and Duke Energy Indiana are stated at fair value.

The following table shows the gross and net receivables sold.

	Duke Energy Ohio				Duke Energy Indiana
(in millions)	September 30, 2021		December 31, 2020		September 30, 2021		December 31, 2020
Receivables sold	$	218	$	270	$	328	$	344
Less: Retained interests	47		83		77		110
Net receivables sold	$	171	$	187	$	251	$	234

The following table shows sales and cash flows related to receivables sold.

	Duke Energy Ohio								Duke Energy Indiana
	Three Months Ended				Nine Months Ended				Three Months Ended				Nine Months Ended
	September 30,				September 30,				September 30,				September 30,
(in millions)	2021		2020		2021		2020		2021		2020		2021		2020
Sales
Receivables sold	$	486	$	462	$	1,490	$	1,428	$	794	$	717	$	2,176	$	1,947
Loss recognized on sale	2		2		7		8		4		3		10		9
Cash flows
Cash proceeds from receivables sold	$	490	$	449	$	1,519	$	1,439	$	798	$	689	$	2,199	$	1,941
Collection fees received	—		1		1		1		—		—		1		1
Return received on retained interests	1		1		3		3		1		1		4		4

Cash flows from sales of receivables are reflected within Cash Flows From Operating Activities and Cash Flows from Investing Activities on Duke Energy Ohio’s and Duke Energy Indiana’s Condensed Consolidated Statements of Cash Flows.

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Revenue

9 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Revenue

REVENUE

Duke Energy earns substantially all of its revenues through its reportable segments, Electric Utilities and Infrastructure, Gas Utilities and Infrastructure and Commercial Renewables.

Electric Utilities and Infrastructure

Electric Utilities and Infrastructure earns the majority of its revenues through retail and wholesale electric service through the generation, transmission, distribution and sale of electricity. Duke Energy generally provides retail and wholesale electric service customers with their full electric load requirements or with supplemental load requirements when the customer has other sources of electricity.

The majority of wholesale revenues are full requirements contracts where the customers purchase the substantial majority of their energy needs and do not have a fixed quantity of contractually required energy or capacity. As such, related forecasted revenues are considered optional purchases. Supplemental requirements contracts that include contracted blocks of energy and capacity at contractually fixed prices have the following estimated remaining performance obligations:

	Remaining Performance Obligations
(in millions)	2021		2022		2023		2024		2025		Thereafter		Total
Progress Energy	$	24	$	107	$	44	$	45	$	7	$	51	$	278
Duke Energy Progress	2		8		8		8		—		—		26
Duke Energy Florida	22		99		36		37		7		51		252
Duke Energy Indiana	—		1		9		14		15		25		64

Revenues for block sales are recognized monthly as energy is delivered and stand-ready service is provided, consistent with invoiced amounts and unbilled estimates.

Gas Utilities and Infrastructure

Gas Utilities and Infrastructure earns its revenue through retail and wholesale natural gas service through the transportation, distribution and sale of natural gas. Duke Energy generally provides retail and wholesale natural gas service customers with all natural gas load requirements. Additionally, while natural gas can be stored, substantially all natural gas provided by Duke Energy is consumed by customers simultaneously with receipt of delivery.

Fixed-capacity payments under long-term contracts for the Gas Utilities and Infrastructure segment include minimum margin contracts and supply arrangements with municipalities and power generation facilities. Revenues for related sales are recognized monthly as natural gas is delivered and stand-ready service is provided, consistent with invoiced amounts and unbilled estimates. Estimated remaining performance obligations are as follows:

	Remaining Performance Obligations
(in millions)	2021		2022		2023		2024		2025		Thereafter		Total
Piedmont	$	17	$	67	$	64	$	61	$	60	$	336	$	605

Commercial Renewables

Commercial Renewables earns the majority of its revenues through long-term PPAs and generally sells all of its wind and solar facility output, electricity and Renewable Energy Certificates (RECs) to customers. Some of these PPAs have been accounted for as leases. For PPAs that are not accounted for as leases, the delivery of electricity and the delivery of RECs are considered separate performance obligations.

Other

The remainder of Duke Energy’s operations is presented as Other, which does not include material revenues from contracts with customers.

Disaggregated Revenues

Disaggregated revenues are presented as follows:

	Three Months Ended September 30, 2021
			Duke				Duke		Duke		Duke		Duke
(in millions)	Duke		Energy		Progress		Energy		Energy		Energy		Energy
By market or type of customer	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Electric Utilities and Infrastructure
Residential	$	2,955	$	892	$	1,525	$	619	$	906	$	223	$	316	$	—
General	1,873		685		826		400		426		119		240		—
Industrial	861		360		264		195		69		35		202		—
Wholesale	619		111		399		324		75		19		89		—
Other revenues	252		72		198		118		80		17		23		—
Total Electric Utilities and Infrastructure revenue from contracts with customers	$	6,560	$	2,120	$	3,212	$	1,656	$	1,556	$	413	$	870	$	—
Gas Utilities and Infrastructure
Residential	$	129	$	—	$	—	$	—	$	—	$	62	$	—	$	66
Commercial	78		—		—		—		—		24		—		58
Industrial	30		—		—		—		—		3		—		26
Power Generation	—		—		—		—		—		—		—		23
Other revenues	33		—		—		—		—		4		—		9
Total Gas Utilities and Infrastructure revenue from contracts with customers	$	270	$	—	$	—	$	—	$	—	$	93	$	—	$	182
Commercial Renewables
Revenue from contracts with customers	$	56	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other
Revenue from contracts with customers	$	8	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Total revenue from contracts with customers	$	6,894	$	2,120	$	3,212	$	1,656	$	1,556	$	506	$	870	$	182
Other revenue sources(a)	$	57	$	(16)	$	21	$	11	$	5	$	—	$	16	$	13
Total revenues	$	6,951	$	2,104	$	3,233	$	1,667	$	1,561	$	506	$	886	$	195

(a)Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues.

	Three Months Ended September 30, 2020
			Duke				Duke		Duke		Duke		Duke
(in millions)	Duke		Energy		Progress		Energy		Energy		Energy		Energy
By market or type of customer	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Electric Utilities and Infrastructure
Residential	$	2,936	$	883	$	1,550	$	616	$	934	$	213	$	289	$	—
General	1,804		664		805		384		421		119		212		—
Industrial	797		342		245		179		66		35		175		—
Wholesale	603		117		412		358		54		10		64		—
Other revenues	238		62		167		75		92		23		22		—
Total Electric Utilities and Infrastructure revenue from contracts with customers	$	6,378	$	2,068	$	3,179	$	1,612	$	1,567	$	400	$	762	$	—
Gas Utilities and Infrastructure
Residential	$	112	$	—	$	—	$	—	$	—	$	55	$	—	$	57
Commercial	64		—		—		—		—		20		—		44
Industrial	24		—		—		—		—		3		—		22
Power Generation	—		—		—		—		—		—		—		10
Other revenues	16		—		—		—		—		3		—		11
Total Gas Utilities and Infrastructure revenue from contracts with customers	$	216	$	—	$	—	$	—	$	—	$	81	$	—	$	144
Commercial Renewables
Revenue from contracts with customers	$	57	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other
Revenue from contracts with customers	$	7	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Total revenue from contracts with customers	$	6,658	$	2,068	$	3,179	$	1,612	$	1,567	$	481	$	762	$	144
Other revenue sources(a)	$	63	$	(10)	$	18	$	14	$	—	$	(8)	$	(1)	$	18
Total revenues	$	6,721	$	2,058	$	3,197	$	1,626	$	1,567	$	473	$	761	$	162

(a)Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues.

	Nine Months Ended September 30, 2021
			Duke				Duke		Duke		Duke		Duke
(in millions)	Duke		Energy		Progress		Energy		Energy		Energy		Energy
By market or type of customer	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Electric Utilities and Infrastructure
Residential	$	7,753	$	2,368	$	3,903	$	1,657	$	2,246	$	589	$	894	$	—
General	4,805		1,685		2,170		1,036		1,134		329		619		—
Industrial	2,228		872		700		500		200		99		558		—
Wholesale	1,644		341		1,056		901		155		45		202		—
Other revenues	712		208		509		272		237		61		64		—
Total Electric Utilities and Infrastructure revenue from contracts with customers	$	17,142	$	5,474	$	8,338	$	4,366	$	3,972	$	1,123	$	2,337	$	—
Gas Utilities and Infrastructure
Residential	$	747	$	—	$	—	$	—	$	—	$	241	$	—	$	505
Commercial	373		—		—		—		—		99		—		273
Industrial	110		—		—		—		—		14		—		96
Power Generation	—		—		—		—		—		—		—		69
Other revenues	100		—		—		—		—		21		—		34
Total Gas Utilities and Infrastructure revenue from contracts with customers	$	1,330	$	—	$	—	$	—	$	—	$	375	$	—	$	977
Commercial Renewables
Revenue from contracts with customers	$	163	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other
Revenue from contracts with customers	$	20	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Total Revenue from contracts with customers	$	18,655	$	5,474	$	8,338	$	4,366	$	3,972	$	1,498	$	2,337	$	977
Other revenue sources(a)	$	204	$	(44)	$	79	$	51	$	15	$	(4)	$	29	$	39
Total revenues	$	18,859	$	5,430	$	8,417	$	4,417	$	3,987	$	1,494	$	2,366	$	1,016

(a)Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues.

	Nine Months Ended September 30, 2020
			Duke				Duke		Duke		Duke		Duke
(in millions)	Duke		Energy		Progress		Energy		Energy		Energy		Energy
By market or type of customer	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Electric Utilities and Infrastructure
Residential	$	7,451	$	2,316	$	3,792	$	1,578	$	2,214	$	558	$	785	$	—
General	4,691		1,720		2,080		1,001		1,079		336		554		—
Industrial	2,148		871		673		487		186		103		502		—
Wholesale	1,535		332		1,018		877		141		22		163		—
Other revenues	713		184		476		208		268		62		63		—
Total Electric Utilities and Infrastructure revenue from contracts with customers	$	16,538	$	5,423	$	8,039	$	4,151	$	3,888	$	1,081	$	2,067	$	—
Gas Utilities and Infrastructure
Residential	$	631	$	—	$	—	$	—	$	—	$	214	$	—	$	417
Commercial	308		—		—		—		—		86		—		222
Industrial	92		—		—		—		—		12		—		80
Power Generation	—		—		—		—		—		—		—		27
Other revenues	58		—		—		—		—		12		—		46
Total Gas Utilities and Infrastructure revenue from contracts with customers	$	1,089	$	—	$	—	$	—	$	—	$	324	$	—	$	792
Commercial Renewables
Revenue from contracts with customers	$	170	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other
Revenue from contracts with customers	$	20	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Total Revenue from contracts with customers	$	17,817	$	5,423	$	8,039	$	4,151	$	3,888	$	1,405	$	2,067	$	792
Other revenue sources(a)	$	274	$	(7)	$	78	$	56	$	9	$	(11)	$	3	$	79
Total revenues	$	18,091	$	5,416	$	8,117	$	4,207	$	3,897	$	1,394	$	2,070	$	871

(a)Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues.

As described in Note 1, Duke Energy adopted the new guidance for credit losses effective January 1, 2020, using the modified retrospective method of adoption, which does not require restatement of prior year reported results. The following table presents the reserve for credit losses for trade and other receivables based on adoption of the new standard.

	Three Months Ended September 30, 2020 and 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Balance at June 30, 2020	$	102	$	14	$	29	$	14	$	14	$	5	$	3	$	6
Write-Offs	12		(2)		15		13		2		—		—		—
Credit Loss Expense	(9)		—		(16)		(15)		—		—		—		3
Other Adjustments	28		10		9		9		—		—		—		—
Balance at September 30, 2020	$	133	$	22	$	37	$	21	$	16	$	5	$	3	$	9
Balance at June 30, 2021	$	123	$	42	$	36	$	21	$	16	$	4	$	3	$	13
Write-Offs	(13)		(3)		(6)		(3)		(3)		—		—		(4)
Credit Loss Expense	11		4		6		3		3		—		—		2
Other Adjustments	2		(1)		—		—		—		—		—		4
Balance at September 30, 2021	$	123	$	42	$	36	$	21	$	16	$	4	$	3	$	15
	Nine Months Ended September 30, 2020 and 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Balance at December 31, 2019	$	76	$	10	$	16	$	8	$	7	$	4	$	3	$	6
Cumulative Change in Accounting Principle	5		1		2		1		1		—		—		1
Write-Offs	(7)		(8)		8		8		—		—		—		(5)
Credit Loss Expense	24		9		2		(5)		8		1		—		7
Other Adjustments	35		10		9		9		—		—		—		—
Balance at September 30, 2020	$	133	$	22	$	37	$	21	$	16	$	5	$	3	$	9
Balance at December 31, 2020	$	146	$	23	$	37	$	23	$	14	$	4	$	3	$	12
Write-Offs	(39)		(10)		(20)		(11)		(9)		—		—		(7)
Credit Loss Expense	40		20		19		9		10		—		—		6
Other Adjustments	(24)		9		—		—		1		—		—		4
Balance at September 30, 2021	$	123	$	42	$	36	$	21	$	16	$	4	$	3	$	15

Trade and other receivables are evaluated based on an estimate of the risk of loss over the life of the receivable and current and historical conditions using supportable assumptions. Management evaluates the risk of loss for trade and other receivables by comparing the historical write-off amounts to total revenue over a specified period. Historical loss rates are adjusted due to the impact of current conditions, as well as forecasted conditions over a reasonable time period. The calculated write-off rate can be applied to the receivable balance for which an established reserve does not already exist. Management reviews the assumptions and risk of loss periodically for trade and other receivables.

The aging of trade receivables is presented in the table below. Duke Energy considers receivables greater than 30 days outstanding past due.

	September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Unbilled Revenue(a)(b)	$	826	$	308	$	242	$	125	$	117	$	5	$	27	$	7
0-30 days	2,201		689		910		521		388		65		41		80
30-60 days	194		74		63		37		26		7		5		6
60-90 days	57		30		14		6		8		1		1		3
90+ days	161		68		27		5		22		31		10		9
Deferred Payment Arrangements(c)	113		66		29		21		8		2		—		6
Trade and Other Receivables	$	3,552	$	1,235	$	1,285	$	715	$	569	$	111	$	84	$	111

	December 31, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Unbilled Revenue(a)(b)	$	969	$	328	$	283	$	167	$	116	$	2	$	16	$	86
0-30 days	1,789		445		707		398		307		60		26		149
30-60 days	185		80		54		25		29		8		3		8
60-90 days	22		1		10		4		6		2		1		3
90+ days	119		16		32		9		23		30		12		9
Deferred Payment Arrangements(c)	215		96		80		52		28		—		—		7
Trade and Other Receivables	$	3,299	$	966	$	1,166	$	655	$	509	$	102	$	58	$	262

(a)Unbilled revenues are recognized by applying customer billing rates to the estimated volumes of energy or natural gas delivered but not yet billed and are included within Receivables and Receivables of VIEs on the Condensed Consolidated Balance Sheets.

(b)Duke Energy Ohio and Duke Energy Indiana sell, on a revolving basis, nearly all of their retail accounts receivable, including receivables for unbilled revenues, to an affiliate, CRC, and account for the transfers of receivables as sales. Accordingly, the receivables sold are not reflected on the Condensed Consolidated Balance Sheets of Duke Energy Ohio and Duke Energy Indiana. See Note 11 for further information. These receivables for unbilled revenues are $64 million and $115 million for Duke Energy Ohio and Duke Energy Indiana, respectively, as of September 30, 2021, and $87 million and $134 million for Duke Energy Ohio and Duke Energy Indiana, respectively, as of December 31, 2020.

(c)Due to certain customer financial hardships created by the COVID-19 pandemic and resulting stay-at-home orders, Duke Energy permitted customers to defer payment of past-due amounts through an installment payment plan over a period of several months.

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Stockholders' Equity

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Stockholders' Equity

STOCKHOLDERS' EQUITY

Basic EPS is computed by dividing net income available to Duke Energy common stockholders, as adjusted for distributed and undistributed earnings allocated to participating securities and accumulated preferred dividends, by the weighted average number of common shares outstanding during the period. Diluted EPS is computed by dividing net income available to Duke Energy common stockholders, as adjusted for distributed and undistributed earnings allocated to participating securities and accumulated preferred dividends, by the diluted weighted average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that could occur if securities or other agreements to issue common stock, such as equity forward sale agreements, were exercised or settled. Duke Energy’s participating securities are restricted stock units that are entitled to dividends declared on Duke Energy common stock during the restricted stock unit’s vesting periods. Dividends declared on preferred stock are recorded on the Condensed Consolidated Statements of Operations as a reduction of net income to arrive at net income available to Duke Energy common stockholders. Dividends accumulated on preferred stock are an adjustment to net income used in the calculation of basic and diluted EPS.

The following table presents Duke Energy’s basic and diluted EPS calculations, the weighted average number of common shares outstanding and common and preferred share dividends declared.

	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions, except per share amounts)	2021		2020		2021		2020
Net income available to Duke Energy common stockholders	$	1,366	$	1,265	$	3,070	$	1,347
Accumulated preferred stock dividends adjustment	12		12		12		13
Less: Impact of participating securities	1		1		3		2
Income from continuing operations available to Duke Energy common stockholders	$	1,377	$	1,276	$	3,079	$	1,358
Weighted average common shares outstanding – basic and diluted	769		735		769		735
EPS available to Duke Energy common stockholders
Basic and diluted	$	1.79	$	1.74	$	4.00	$	1.85
Potentially dilutive items excluded from the calculation(a)	2		2		2		2
Dividends declared per common share	$	0.985	$	0.965	$	2.915	$	2.855
Dividends declared on Series A preferred stock per depositary share(b)	$	0.359	$	0.359	$	1.078	$	1.078
Dividends declared on Series B preferred stock per share(c)	$	24.375	$	24.375	$	48.750	$	49.292

(a)Performance stock awards were not included in the dilutive securities calculation because the performance measures related to the awards had not been met.

(b)5.75% Series A Cumulative Redeemable Perpetual Preferred Stock dividends are payable quarterly in arrears on the 16th day of March, June, September and December. The preferred stock has a $25 liquidation preference per depositary share.

(c)4.875% Series B Fixed-Rate Reset Cumulative Redeemable Perpetual Preferred Stock dividends are payable semiannually in arrears on the 16th day of March and September. The preferred stock has a $1,000 liquidation preference per share.

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Employee Benefit Plans

9 Months Ended

Sep. 30, 2021

Retirement Benefits [Abstract]

Employee Benefit Plans

EMPLOYEE BENEFIT PLANS

DEFINED BENEFIT RETIREMENT PLANS

Duke Energy and certain subsidiaries maintain, and the Subsidiary Registrants participate in, qualified and non-qualified, non-contributory defined benefit retirement plans. Duke Energy's policy is to fund amounts on an actuarial basis to provide assets sufficient to meet benefit payments to be paid to plan participants.

Duke Energy monitors lump-sum benefit payment activity associated with its defined benefit retirement plans. Duke Energy does not believe it is probable that total lump-sum benefit payments will exceed the settlement threshold, defined as the sum of service cost and interest cost on projected benefit obligation components of net periodic pension costs, for any of its defined benefit retirement plans in 2021. If Duke Energy believed it were probable that total lump-sum benefit payments would exceed the settlement threshold in 2021, then a settlement charge reflecting the recognition of a pro-rata portion of previously unrecognized actuarial losses, equal to the percentage of reduction in the projected benefit obligation resulting from total lump-sum benefit payments, would be recognized.

QUALIFIED PENSION PLANS

The following tables include the components of net periodic pension costs for qualified pension plans.

	Three Months Ended September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Service cost	$	43	$	14	$	13	$	7	$	5	$	2	$	2	$	1
Interest cost on projected benefit obligation	55		13		17		8		10		2		5		2
Expected return on plan assets	(139)		(36)		(47)		(21)		(25)		(7)		(10)		(5)
Amortization of actuarial loss	33		7		10		5		5		2		3		2
Amortization of prior service credit	(7)		(2)		(1)		—		(1)		—		—		(1)
Amortization of settlement charges	2		1		1		—		—		—		—		1
Net periodic pension costs	$	(13)	$	(3)	$	(7)	$	(1)	$	(6)	$	(1)	$	—	$	—

	Three Months Ended September 30, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Service cost	$	41	$	12	$	12	$	6	$	5	$	1	$	2	$	1
Interest cost on projected benefit obligation	67		16		21		10		12		4		6		2
Expected return on plan assets	(143)		(36)		(48)		(22)		(25)		(7)		(11)		(5)
Amortization of actuarial loss	32		7		10		4		6		2		3		2
Amortization of prior service credit	(8)		(2)		—		—		—		—		—		(2)
Amortization of settlement charges	11		6		5		5		1		—		1		1
Net periodic pension costs	$	—	$	3	$	—	$	3	$	(1)	$	—	$	1	$	(1)

	Nine Months Ended September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Service cost	$	131	$	42	$	38	$	22	$	16	$	4	$	7	$	4
Interest cost on projected benefit obligation	165		38		52		23		29		9		14		6
Expected return on plan assets	(418)		(106)		(141)		(63)		(76)		(21)		(30)		(15)
Amortization of actuarial loss	100		22		29		14		15		5		10		7
Amortization of prior service credit	(22)		(6)		(2)		(1)		(1)		—		(1)		(6)
Amortization of settlement charges	6		4		2		1		—		—		—		1
Net periodic pension costs	$	(38)	$	(6)	$	(22)	$	(4)	$	(17)	$	(3)	$	—	$	(3)

	Nine Months Ended September 30, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Service cost	$	124	$	38	$	36	$	20	$	16	$	3	$	6	$	4
Interest cost on projected benefit obligation	202		47		64		29		35		12		17		7
Expected return on plan assets	(429)		(108)		(143)		(66)		(76)		(21)		(32)		(16)
Amortization of actuarial loss	96		21		30		13		17		5		9		7
Amortization of prior service credit	(24)		(6)		(2)		(1)		(1)		—		(1)		(7)
Amortization of settlement charges	16		8		6		6		1		—		1		1
Net periodic pension costs	$	(15)	$	—	$	(9)	$	1	$	(8)	$	(1)	$	—	$	(4)

NON-QUALIFIED PENSION PLANS

Net periodic pension costs for non-qualified pension plans were not material for the three and nine months ended September 30, 2021, and 2020.

OTHER POST-RETIREMENT BENEFIT PLANS

Net periodic costs for OPEB plans were not material for the three and nine months ended September 30, 2021, and 2020.

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Income Taxes

9 Months Ended

Sep. 30, 2021

Income Tax Disclosure [Abstract]

Income Taxes

INCOME TAXES

EFFECTIVE TAX RATES

The ETRs from continuing operations for each of the Duke Energy Registrants are included in the following table.

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Duke Energy	6.6	%	7.8	%	6.7	%	(6.4)	%
Duke Energy Carolinas	2.9	%	12.0	%	3.6	%	13.6	%
Progress Energy	12.9	%	10.4	%	11.5	%	13.4	%
Duke Energy Progress	6.3	%	3.1	%	5.9	%	10.0	%
Duke Energy Florida	19.1	%	21.4	%	19.1	%	20.3	%
Duke Energy Ohio	13.4	%	16.7	%	15.3	%	16.6	%
Duke Energy Indiana	15.8	%	19.6	%	16.3	%	19.4	%
Piedmont	25.0	%	16.7	%	8.4	%	3.7	%

The decrease in the ETR for Duke Energy for the three months ended September 30, 2021, was primarily due to an increase in the amortization of excess deferred taxes.

The increase in the ETR for Duke Energy for the nine months ended September 30, 2021, was primarily due to the cancellation of the ACP pipeline project recorded in the prior year, partially offset by an increase in the amortization of excess deferred taxes.

The decrease in the ETR for Duke Energy Carolinas for the three and nine months ended September 30, 2021, was primarily due to an increase in the amortization of excess deferred taxes.

The increase in the ETR for Progress Energy for the three months ended September 30, 2021, was primarily due to a decrease in the amortization of excess deferred taxes.

The decrease in the ETR for Progress Energy for the nine months ended September 30, 2021, was primarily due to an increase in the amortization of excess deferred taxes.

The increase in the ETR for Duke Energy Progress for the three months ended September 30, 2021, was primarily due to a decrease in the amortization of excess deferred taxes.

The decrease in the ETR for Duke Energy Progress for the nine months ended September 30, 2021, was primarily due to an increase in the amortization of excess deferred taxes.

The decrease in the ETR for Duke Energy Florida for the three and nine months ended September 30, 2021, was primarily due to unfavorable tax adjustments in the prior year.

The decrease in the ETR for Duke Energy Ohio for the three and nine months ended September 30, 2021, was primarily due to an increase in the amortization of excess deferred taxes.

The decrease in the ETR for Duke Energy Indiana for the three and nine months ended September 30, 2021, was primarily due to an increase in the amortization of excess deferred taxes.

The increase in the ETR for Piedmont for the three months ended September 30, 2021, was primarily due to a certain favorable tax credits.The increase in the ETR for Piedmont for the nine months ended September 30, 2021, was primarily due to a decrease in AFUDC equity.

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Subsequent Events	9 Months Ended
	Sep. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTSFor information on subsequent events related to regulatory matters, commitments and contingencies and debt and credit facilities, see Notes 3, 4 and 5.

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Organization and Basis of Presentation (Policy)

9 Months Ended

Sep. 30, 2021

Policy Text Block [Line Items]

Basis of Presentation

BASIS OF PRESENTATION

These Condensed Consolidated Financial Statements have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Regulation S-X. Accordingly, these Condensed Consolidated Financial Statements do not include all information and notes required by GAAP for annual financial statements and should be read in conjunction with the Consolidated Financial Statements in the Duke Energy Registrants’ combined Annual Report on Form 10-K for the year ended December 31, 2020.

The information in these combined notes relates to each of the Duke Energy Registrants as noted in the Index to Combined Notes to Condensed Consolidated Financial Statements. However, none of the registrants make any representations as to information related solely to Duke Energy or the subsidiaries of Duke Energy other than itself.

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

In preparing financial statements that conform to GAAP, management must make estimates and assumptions that affect the reported amounts of assets and liabilities, the reported amounts of revenues and expenses and the disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates.

Basis of Consolidation and Noncontrolling Interest

BASIS OF CONSOLIDATION

These Condensed Consolidated Financial Statements include, after eliminating intercompany transactions and balances, the accounts of the Duke Energy Registrants and subsidiaries or VIEs where the respective Duke Energy Registrants have control. See Note 11 for additional information on VIEs. These Condensed Consolidated Financial Statements also reflect the Duke Energy Registrants’ proportionate share of certain jointly owned generation and transmission facilities.

NONCONTROLLING INTEREST

Duke Energy maintains a controlling financial interest in certain less than wholly owned nonregulated subsidiaries. As a result, Duke Energy consolidates these subsidiaries and presents the third-party investors' portion of Duke Energy's net income (loss), net assets and comprehensive income (loss) as noncontrolling interest. Noncontrolling interest is included as a component of equity on the Condensed Consolidated Balance Sheet.

Several operating agreements of Duke Energy's subsidiaries with noncontrolling interest are subject to allocations of earnings, tax attributes and cash flows in accordance with contractual agreements that vary throughout the lives of the subsidiaries. Therefore, Duke Energy and the other investors' (the owners) interests in the subsidiaries are not fixed, and the subsidiaries apply the Hypothetical Liquidation at Book Value (HLBV) method in allocating income or loss and other comprehensive income or loss (all measured on a pretax basis) to the owners. The HLBV method measures the amounts that each owner would hypothetically claim at each balance sheet reporting date, including tax benefits realized by the owners over the IRS recapture period, upon a hypothetical liquidation of the subsidiary at the net book value of its underlying assets. The change in the amount that each owner would hypothetically receive at the reporting date compared to the amount it would have received on the previous reporting date represents the amount of income or loss allocated to each owner for the reporting period.

During September 2021, Duke Energy completed the initial minority interest investment in a portion of Duke Energy Indiana to an affiliate of GIC. GIC's ownership interest in Duke Energy Indiana represents a noncontrolling interest. See Note 2 for additional information on the sale.Other operating agreements of Duke Energy's subsidiaries with noncontrolling interest allocate profit and loss based on their pro rata shares of the ownership interest in the respective subsidiary. Therefore, Duke Energy allocates net income or loss and other comprehensive income or loss of these subsidiaries to the owners based on their pro rata shares.

Cash, Cash Equivalents, and Restricted Cash

CASH, CASH EQUIVALENTS AND RESTRICTED CASHDuke Energy, Progress Energy and Duke Energy Florida have restricted cash balances related primarily to collateral assets, escrow deposits and VIEs. See Notes 9 and 11 for additional information. Restricted cash amounts are included in Other within Current Assets and Other Noncurrent Assets on the Condensed Consolidated Balance Sheets.

New Accounting Standards

NEW ACCOUNTING STANDARDS

The following new accounting standard was adopted by the Duke Energy Registrants in 2021.

Leases with Variable Lease Payments. In July 2021, the Financial Accounting Standards Board (FASB) issued new accounting guidance requiring lessors to classify a lease with variable lease payments that do not depend on a reference index or rate as an operating lease if both of the following are met: (1) the lease would have to be classified as a sales-type or direct financing lease under prior guidance, and (2) the lessor would have recognized a day-one loss. Duke Energy elected to adopt the guidance immediately upon issuance of the new standard and will be applying the new standard prospectively to new lease arrangements meeting the criteria. Duke Energy does not currently have any lease arrangements that this new accounting guidance will materially impact.

The following accounting standard was adopted by the Duke Energy Registrants in 2020.

Current Expected Credit Losses. In June 2016, the FASB issued new accounting guidance for credit losses. Duke Energy adopted the new accounting guidance for credit losses effective January 1, 2020, using the modified retrospective method of adoption, which does not require restatement of prior year results. Duke Energy did not adopt any practical expedients.

Duke Energy recognizes allowances for credit losses based on management's estimate of losses expected to be incurred over the lives of certain assets or guarantees. Management monitors credit quality, changes in expected credit losses and the appropriateness of the allowance for credit losses on a forward-looking basis. Management reviews the risk of loss periodically as part of the existing assessment of collectability of receivables.

Duke Energy reviews the credit quality of its counterparties as part of its regular risk management process and requires credit enhancements, such as deposits or letters of credit, as appropriate and as allowed by regulators.

Duke Energy recorded cumulative effects of changes in accounting principles related to the adoption of the new credit loss standard for allowances for credit losses of trade and other receivables, insurance receivables and financial guarantees. These amounts are included in the Condensed Consolidated Balance Sheets in Receivables, Receivables of VIEs, Other Noncurrent Assets and Other Noncurrent Liabilities. See Notes 4 and 12 for more information.

Duke Energy recorded an adjustment for the cumulative effect of a change in accounting principle due to the adoption of this standard on January 1, 2020, as shown in the table below:

	January 1, 2020
			Duke				Duke		Duke
	Duke		Energy		Progress		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Piedmont
Total pretax impact to Retained Earnings	$	120	$	16	$	2	$	1	$	1	$	1

The following new accounting standard has been issued but not yet adopted by the Duke Energy Registrants as of September 30, 2021.

Reference Rate Reform. In March 2020, the FASB issued new accounting guidance for reference rate reform. This guidance is elective and provides expedients to facilitate financial reporting for the anticipated transition away from the London Inter-bank Offered Rate (LIBOR) and other interbank reference rates by the end of 2022. The optional expedients are effective for modification of existing contracts or new arrangements executed between March 12, 2020, through December 31, 2022.

Duke Energy has variable-rate debt and manages interest rate risk by entering into financial contracts including interest rate swaps that are generally indexed to LIBOR. Impacted financial arrangements extending beyond 2022 may require contractual amendment or termination to fully adapt to a post-LIBOR environment. Duke Energy is assessing these financial arrangements and is evaluating the use of optional expedients outlined in the new accounting guidance. Alternative index provisions are also being assessed and incorporated into new financial arrangements that extend beyond 2022. The full outcome of the transition away from LIBOR cannot be determined at this time, but is not expected to have a material impact on the financial statements.

Environmental Costs

Liabilities are recorded when losses become probable and are reasonably estimable.Costs are typically expensed as Operation, maintenance and other on the Condensed Consolidated Statements of Operations unless regulatory recovery of the costs is deemed probable.

Derivatives

Duke Energy’s interest rate swaps for its regulated operations employ regulatory accounting. With regulatory accounting, the mark-to-market gains or losses on the swaps are deferred as regulatory liabilities or regulatory assets, respectively. Regulatory assets and liabilities are amortized consistent with the treatment of the related costs in the ratemaking process. The accrual of interest on the swaps is recorded as Interest Expense on the Duke Energy Registrant's Condensed Consolidated Statements of Operations and Comprehensive Income.

Cash Flow Hedges

For derivatives designated as hedging the exposure to variable cash flows of a future transaction, referred to as a cash flow hedge, the derivative's gain or loss is initially reported as a component of other comprehensive income and subsequently reclassified into earnings once the future transaction impacts earnings. Gains and losses reclassified out of accumulated other comprehensive loss for the three and nine months ended September 30, 2021, and 2020, were not material. Duke Energy’s commodity derivatives designated as hedges include long-term electricity sales in the Commercial Renewables segment.

Undesignated Contracts

For the Subsidiary Registrants, bulk power electricity and natural gas purchases flow through fuel adjustment clauses, formula-based contracts or other cost-sharing mechanisms. Differences between the costs included in rates and the incurred costs, including undesignated derivative contracts, are largely deferred as regulatory assets or regulatory liabilities. Piedmont policies allow for the use of financial instruments to hedge commodity price risks. The strategy and objective of these hedging programs are to use the financial instruments to reduce natural gas costs volatility for customers.

Investments

As a result, the ability to hold investments in unrealized loss positions is outside the control of the Duke Energy Registrants. Accordingly, all unrealized losses associated with debt securities within the Investment Trusts are recognized immediately and deferred to regulatory accounts where appropriate.Unrealized gains and losses on all other AFS securities are included in other comprehensive income until realized, unless it is determined the carrying value of an investment has a credit loss. The Duke Energy Registrants analyze all investment holdings each reporting period to determine whether a decline in fair value is related to a credit loss. If a credit loss exists, the unrealized credit loss is included in earnings.

Revenue from Contract with Customer

Duke Energy earns substantially all of its revenues through its reportable segments, Electric Utilities and Infrastructure, Gas Utilities and Infrastructure and Commercial Renewables.

Earnings Per Share

Basic EPS is computed by dividing net income available to Duke Energy common stockholders, as adjusted for distributed and undistributed earnings allocated to participating securities and accumulated preferred dividends, by the weighted average number of common shares outstanding during the period. Diluted EPS is computed by dividing net income available to Duke Energy common stockholders, as adjusted for distributed and undistributed earnings allocated to participating securities and accumulated preferred dividends, by the diluted weighted average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that could occur if securities or other agreements to issue common stock, such as equity forward sale agreements, were exercised or settled. Duke Energy’s participating securities are restricted stock units that are entitled to dividends declared on Duke Energy common stock during the restricted stock unit’s vesting periods. Dividends declared on preferred stock are recorded on the Condensed Consolidated Statements of Operations as a reduction of net income to arrive at net income available to Duke Energy common stockholders. Dividends accumulated on preferred stock are an adjustment to net income used in the calculation of basic and diluted EPS.

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Organization and Basis of Presentation (Tables)

9 Months Ended

Sep. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Cash Received and Allocated Losses from Subsidiaries, Noncontrolling Interest

The following table presents allocated losses to noncontrolling interest for the three and nine months ended September 30, 2021, and 2020.

	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2021		2020		2021		2020
Noncontrolling Interest Allocation of Income
Allocated losses to noncontrolling tax equity members utilizing the HLBV method	$	119	$	59	$	217	$	187
Allocated losses to noncontrolling members based on pro rata shares of ownership	10		11		30		21
Total Noncontrolling Interest Allocated Losses	$	129	$	70	$	247	$	208

Schedule of Cash, Cash Equivalents and Restricted Cash

The following table presents the components of cash, cash equivalents and restricted cash included in the Condensed Consolidated Balance Sheets.

	September 30, 2021						December 31, 2020
					Duke						Duke
	Duke		Progress		Energy		Duke		Progress		Energy
	Energy		Energy		Florida		Energy		Energy		Florida
Current Assets
Cash and cash equivalents	$	548	$	102	$	40	$	259	$	59	$	11
Other	194		17		17		194		39		39
Other Noncurrent Assets
Other	1		—		—		103		102		—
Total cash, cash equivalents and restricted cash	$	743	$	119	$	57	$	556	$	200	$	50

Schedule of Utility Inventory

The components of inventory are presented in the tables below.

	September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Materials and supplies	$	2,317	$	779	$	1,009	$	674	$	336	$	85	$	305	$	11
Coal	312		152		89		45		43		10		61		—
Natural gas, oil and other fuel	271		38		157		96		60		19		1		57
Total inventory	$	2,900	$	969	$	1,255	$	815	$	439	$	114	$	367	$	68

	December 31, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Materials and supplies	$	2,312	$	785	$	999	$	673	$	325	$	78	$	307	$	12
Coal	561		186		193		131		63		16		165		—
Natural gas, oil and other fuel	294		39		183		107		76		16		1		56
Total inventory	$	3,167	$	1,010	$	1,375	$	911	$	464	$	110	$	473	$	68

Schedule of New Accounting Pronouncements

Duke Energy recorded an adjustment for the cumulative effect of a change in accounting principle due to the adoption of this standard on January 1, 2020, as shown in the table below:

	January 1, 2020
			Duke				Duke		Duke
	Duke		Energy		Progress		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Piedmont
Total pretax impact to Retained Earnings	$	120	$	16	$	2	$	1	$	1	$	1

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Business Segments (Tables)

9 Months Ended

Sep. 30, 2021

Segment Reporting Information [Line Items]

Business Segment Data

Business segment information is presented in the following tables. Segment assets presented exclude intercompany assets.

	Three Months Ended September 30, 2021
	Electric		Gas				Total
	Utilities and		Utilities and		Commercial		Reportable
(in millions)	Infrastructure		Infrastructure		Renewables		Segments		Other		Eliminations		Total
Unaffiliated revenues	$	6,560	$	266	$	117	$	6,943	$	8	$	—	$	6,951
Intersegment revenues	9		23		—		32		20		(52)		—
Total revenues	$	6,569	$	289	$	117	$	6,975	$	28	$	(52)	$	6,951
Segment income (loss)(a)	$	1,425	$	(3)	$	78	$	1,500	$	(134)	$	—	$	1,366
Less: Noncontrolling interests													129
Add: Preferred stock dividend													39
Net Income													$	1,276
Segment assets	$	141,565	$	14,692	$	7,037	$	163,294	$	3,717	$	(4)	$	167,007

	Three Months Ended September 30, 2020
	Electric		Gas				Total
	Utilities and		Utilities and		Commercial		Reportable
(in millions)	Infrastructure		Infrastructure		Renewables		Segments		Other		Eliminations		Total
Unaffiliated revenues	$	6,371	$	217	$	126	$	6,714	$	7	$	—	$	6,721
Intersegment revenues	8		24		—		32		17		(49)		—
Total revenues	$	6,379	$	241	$	126	$	6,746	$	24	$	(49)	$	6,721
Segment income (loss)(b)	$	1,381	$	(73)	$	60	$	1,368	$	(103)	$	—	$	1,265
Less: Noncontrolling interests													70
Add: Preferred stock dividend													39
Net Income													$	1,234

(a)Gas Utilities and Infrastructure includes $3 million, recorded within Equity in earnings (losses) of unconsolidated affiliates on the Condensed Consolidated Statements of Operations, related to gas pipeline investments. See Note 3 for additional information. Other includes $8 million recorded within Impairment of assets and other charges, $1 million within Operations, maintenance and other on the Condensed Consolidated Statements of Operations, related to the workplace and workforce realignment. See Note 1 for additional information. Electric Utilities and Infrastructure includes $160 million recorded within Impairment of assets and other charges, $77 million within Other Income and expenses, $5 million within Operations, maintenance and other, $13 million within Regulated electric operating revenues and $3 million within Interest expense on the Duke Energy Carolinas' Condensed Consolidated Statement of Operations related to the 2018 South Carolina rate cases and the CCR settlement and insurance proceeds distributed in accordance with that agreement; it also includes $42 million recorded within Impairment of assets and other charges, $34 million within Other Income and expenses, $7 million within Operations, maintenance, and other, $15 million within Regulated electric operating revenues and $5 million within Interest expense on the Duke Energy Progress' Condensed Consolidated Statement of Operations. See Notes 3 and 4 for more information.

(b)Electric Utilities and Infrastructure includes $19 million recorded within Impairment charges and $8 million recorded within Operations, maintenance and other on the Duke Energy Carolinas' Condensed Consolidated Statements of Operations related to a partial settlement in the Duke Energy Carolinas' 2019 North Carolina rate case and $8 million recorded within Operations, maintenance and other on Duke Energy Progress' Condensed Consolidated Statements of Operation related to a partial settlement in the Duke Energy Progress' 2019 North Carolina rate case. See Note 3 for more information. Additionally, Electric Utilities and Infrastructure includes $5 million of Impairment charges related to gas pipeline assets recorded on Duke Energy Progress' Condensed Consolidated Statement of Operations. Gas Utilities and Infrastructure includes $78 million recorded within Equity in earnings (losses) of unconsolidated affiliates on the Condensed Consolidated Statements of Operations and $7 million in Impairment charges recorded on the Piedmont Condensed Consolidated Statements of Operations related to gas pipeline investments.

	Nine Months Ended September 30, 2021
	Electric		Gas				Total
	Utilities and		Utilities and		Commercial		Reportable
(in millions)	Infrastructure		Infrastructure		Renewables		Segments		Other		Eliminations		Total
Unaffiliated revenues	$	17,161	$	1,323	$	355	$	18,839	$	20	$	—	$	18,859
Intersegment revenues	24		68		—		92		61		(153)		—
Total revenues	$	17,185	$	1,391	$	355	$	18,931	$	81	$	(153)	$	18,859
Segment income (loss)(a)	$	3,180	$	259	$	152	$	3,591	$	(521)	$	—	$	3,070
Less: Noncontrolling interests													247
Add: Preferred stock dividend													92
Net Income													$	2,915

	Nine Months Ended September 30, 2020
	Electric		Gas				Total
	Utilities and		Utilities and		Commercial		Reportable
(in millions)	Infrastructure		Infrastructure		Renewables		Segments		Other		Eliminations		Total
Unaffiliated revenues	$	16,571	$	1,122	$	378	$	18,071	$	20	$	—	$	18,091
Intersegment revenues	25		72		—		97		53		(150)		—
Total revenues	$	16,596	$	1,194	$	378	$	18,168	$	73	$	(150)	$	18,091
Segment income (loss)(b)	$	2,839	$	(1,400)	$	207	$	1,646	$	(299)	$	—	$	1,347
Less: Noncontrolling interests													208
Add: Preferred stock dividend													93
Net Income													$	1,232

(a)Gas Utilities and Infrastructure includes $19 million, recorded within Equity in earnings (losses) of unconsolidated affiliates on the Condensed Consolidated Statements of Operations, related to gas pipeline investments. See Note 3 for additional information. Commercial Renewables includes a $35 million loss related to Texas Storm Uri, of which ($8 million) is recorded within Nonregulated electric and other revenues, $2 million within Operations, maintenance and other, $29 million within Equity in earnings (losses) of unconsolidated affiliates and $12 million within Loss Attributable to Noncontrolling Interests on the Condensed Consolidated Statements of Operations. See Note 4 for additional information. Other includes $139 million recorded within Impairment of assets and other charges, $28 million within Operations, maintenance and other, and $17 million within Depreciation and amortization on the Condensed Consolidated Statements of Operations, related to the workplace and workplace realignment. See Note 1 for additional information. Electric Utilities and Infrastructure includes $160 million recorded within Impairment of assets and other charges, $77 million within Other Income and expenses, $5 million within Operations, maintenance and other, $13 million within regulated operating revenues and $3 million within interest expense on the Duke Energy Carolinas' Condensed Consolidated Statement of Operations related to the 2018 South Carolina rate cases and the CCR settlement and insurance proceeds distributed in accordance with that agreement; it also includes $42 million recorded within Impairment of assets and other charges, $34 million within Other Income and expenses, $7 million within Operations, maintenance, and other, $15 million within Regulated electric operating revenues and $5 million within interest expense on the Duke Energy Progress' Condensed Consolidated Statement of Operations. See Notes 3 and 4 for more information.

(b)Gas Utilities and Infrastructure includes $2 billion recorded within Equity in earnings (losses) of unconsolidated affiliates on the Condensed Consolidated Statements of Operations, related to gas pipeline investments. See Note 3 for additional information. Other includes a $98 million reversal, included in Operations, maintenance and other on the Condensed Consolidated Statements of Operations, of 2018 severance costs due to a partial settlement in the Duke Energy Carolinas' 2019 North Carolina rate case. See Note 3 for additional information. Electric Utilities and Infrastructure includes $19 million recorded within Impairment charges and $8 million recorded within Operations, maintenance and other on the Duke Energy Carolinas' Condensed Consolidated Statements of Operations related to a partial settlement in the Duke Energy Carolinas' 2019 North Carolina rate case and $8 million recorded within Operations, maintenance and other on Duke Energy Progress' Condensed Consolidated Statements of Operation related to a partial settlement in the Duke Energy Progress' 2019 North Carolina rate case. See Note 3 for more information. Additionally, Electric Utilities and Infrastructure includes $5 million of Impairment charges related to gas pipeline assets recorded on Duke Energy Progress' Condensed Consolidated Statement of Operations in the prior year.

Duke Energy Ohio

Segment Reporting Information [Line Items]

Business Segment Data

	Three Months Ended September 30, 2021
	Electric		Gas		Total
	Utilities and		Utilities and		Reportable
(in millions)	Infrastructure		Infrastructure		Segments		Other		Eliminations		Total
Total revenues	$	413	$	93	$	506	$	—	$	—	$	506
Segment income/Net (loss) income	$	48	$	11	$	59	$	(1)	$	—	$	58
Segment assets	$	6,716	$	3,783	$	10,499	$	27	$	(21)	$	10,505

	Three Months Ended September 30, 2020
	Electric		Gas		Total
	Utilities and		Utilities and		Reportable
(in millions)	Infrastructure		Infrastructure		Segments		Other		Total
Total revenues	$	394	$	79	$	473	$	—	$	473
Segment income/Net (loss) income	$	63	$	9	$	72	$	(2)	$	70

	Nine Months Ended September 30, 2021
	Electric		Gas		Total
	Utilities and		Utilities and		Reportable
(in millions)	Infrastructure		Infrastructure		Segments		Other		Total
Total revenues	$	1,119	$	375	$	1,494	$	—	$	1,494
Segment income/Net (loss) income	$	122	$	77	$	199	$	(11)	$	188

	Nine Months Ended September 30, 2020
	Electric		Gas		Total
	Utilities and		Utilities and		Reportable
(in millions)	Infrastructure		Infrastructure		Segments		Other		Total
Total revenues	$	1,070	$	324	$	1,394	$	—	$	1,394
Segment income/Net (loss) income	$	137	$	68	$	205	$	(4)	$	201

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Regulatory Matters (Tables)

9 Months Ended

Sep. 30, 2021

Regulated Operations [Abstract]

Schedule of Potential Plant Retirements

The table below contains the net carrying value of generating facilities planned for retirement or included in recent IRPs as evaluated for potential retirement. Dollar amounts in the table below are included in Net property, plant and equipment on the Condensed Consolidated Balance Sheets as of September 30, 2021, and exclude capitalized asset retirement costs.

		Remaining Net
	Capacity	Book Value
	(in MW)	(in millions)
Duke Energy Carolinas
Allen Steam Station Units 1-2(a)	324	$	19
Allen Steam Station Units 4-5(b)	516	362
Cliffside Unit 5(b)	544	367
Duke Energy Progress
Mayo Unit 1(b)	704	640
Roxboro Units 3-4(b)	1,392	465
Duke Energy Florida
Crystal River Units 4-5(c)	1,410	1,658
Duke Energy Indiana (d)
Gibson Units 1-5(e)	2,822	1,814
Cayuga Units 1-2(e)	995	713
Total Duke Energy	8,707	$	6,038

(a)As part of the 2015 resolution of a lawsuit involving alleged New Source Review violations, Duke Energy Carolinas must retire Allen Steam Station Units 1 through 3 by December 31, 2024. The long-term energy options considered in the IRP could result in retirement of these units earlier than their current estimated useful lives. Unit 3 with a capacity of 270 MW and a net book value of $26 million at December 31, 2020, was retired in March 2021.

(b)These units were included in the IRP filed by Duke Energy Carolinas and Duke Energy Progress in North Carolina and South Carolina on September 1, 2020. The long-term energy options considered in the IRP could result in retirement of these units earlier than their current estimated useful lives. In 2019, Duke Energy Carolinas and Duke Energy Progress filed North Carolina rate cases that included depreciation studies that accelerate end-of-life dates for these plants. The NCUC issued orders in the 2019 rate cases of Duke Energy Carolinas and Duke Energy Progress on March 31, 2021, and April 16, 2021, respectively, in which the proposals to shorten the remaining depreciable lives of these units were denied, while indicating the IRP proceeding was the appropriate proceeding for the review of generating plant retirements.

(c)On January 14, 2021, Duke Energy Florida filed a settlement agreement with the FPSC, which proposed depreciation rates reflecting retirement dates for Duke Energy Florida's last two coal-fired generating facilities, Crystal River Units 4-5, eight years ahead of schedule in 2034 rather than in 2042. The settlement was approved by the FPSC on May 4, 2021.

(d)Gallagher Units 2 and 4 with a total capacity of 280 MW and a total net book value of $102 million at December 31, 2020, were retired on June 1, 2021.

(e)The rate case filed July 2, 2019, included proposed depreciation rates reflecting retirement dates from 2026 to 2038. The depreciation rates reflecting these updated retirement dates were approved by the IURC as part of the rate case order issued on June 29, 2020.

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Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2021

Commitments and Contingencies Disclosure [Abstract]

Schedule of Reserves

The following table contains information regarding reserves for probable and estimable costs related to the various environmental sites. These reserves are recorded in Other within Other Noncurrent Liabilities on the Condensed Consolidated Balance Sheets.

(in millions)	September 30, 2021		December 31, 2020
Reserves for Environmental Remediation
Duke Energy	$	74	$	75
Duke Energy Carolinas	19		19
Progress Energy	17		19
Duke Energy Progress	6		6
Duke Energy Florida	11		12
Duke Energy Ohio	21		22
Duke Energy Indiana	5		6
Piedmont	12		10

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Debt and Credit Facilities (Tables)

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

The following table summarizes significant debt issuances (in millions).

				Nine Months Ended September 30, 2021
						Duke		Duke		Duke
	Maturity	Interest		Duke		Energy		Energy		Energy
Issuance Date	Date	Rate		Energy		(Parent)		Carolinas		Progress		Piedmont
Unsecured Debt
March 2021(a)	March 2031	2.500	%	$	350	$	—	$	—	$	—	$	350
June 2021(b)(c)	June 2023	2.500	%	500		500		—		—		—
June 2021(c)	June 2031	2.550	%	1,000		1,000		—		—		—
June 2021(c)	June 2041	3.300	%	750		750		—		—		—
June 2021(c)	June 2051	3.500	%	750		750		—		—		—
September 2021(d)	January 2082	3.250	%	500		500		—		—		—
First Mortgage Bonds
April 2021(e)	April 2031	2.550	%	550		—		550		—		—
April 2021(e)	April 2051	3.450	%	450		—		450		—		—
August 2021(f)	August 2031	2.000	%	650		—		—		650		—
August 2021(f)	August 2051	2.900	%	450		—		—		450		—
Total issuances				$	5,950	$	3,500	$	1,000	$	1,100	$	350

(a)Debt issued to repay at maturity $160 million senior unsecured notes due June 2021, pay down short-term debt and for general corporate purposes.

(b)Debt issuance has a floating interest rate.

(c)Debt issued to repay $1.75 billion of Duke Energy (Parent) 2021 debt maturities, to repay a portion of short-term debt and for general corporate purposes.

(d)Debt issued to repay in October 2021 $500 million of Duke Energy (Parent) unsecured notes. The interest rate resets every five years.

(e)Debt issued to repay at maturity $500 million first mortgage bonds due June 2021, pay down short-term debt and for general company purposes.

(f)Debt issued to repay at maturity a total of $600 million first mortgage bonds due September 2021, pay down short-term debt and for general company purposes.

The following table shows the significant components of Current maturities of long-term debt on the Condensed Consolidated Balance Sheets. The Duke Energy Registrants currently anticipate satisfying these obligations with cash on hand and proceeds from additional borrowings.

(in millions)	Maturity Date	Interest Rate		September 30, 2021
Unsecured Debt
Duke Energy (Parent)(a)	October 2021	5.125	%	500
Duke Energy Florida(b)	November 2021	0.372	%	200
Duke Energy Progress(b)	February 2022	0.305	%	700
Duke Energy (Parent)	March 2022	3.227	%	300
Duke Energy (Parent)(b)	March 2022	0.764	%	300
Progress Energy	April 2022	3.150	%	450
Duke Energy (Parent)	August 2022	3.050	%	500
Duke Energy (Parent)	August 2022	2.400	%	500
First Mortgage Bonds
Duke Energy Indiana	January 2022	8.850	%	53
Duke Energy Carolinas	May 2022	3.350	%	350
Duke Energy Progress	May 2022	2.800	%	500
Other(c)				520
Current maturities of long-term debt				$	4,873

(a)Junior unsecured notes due January 2073 were redeemed on October 7, 2021.

(b)Debt has a floating interest rate.

(c)Includes finance lease obligations, amortizing debt, tax-exempt bonds with mandatory put options and small bullet maturities.

Schedule Of Line Of Credit Facilities

The table below includes the current borrowing sublimits and available capacity under these credit facilities.

	September 30, 2021
			Duke		Duke		Duke		Duke		Duke		Duke
	Duke		Energy		Energy		Energy		Energy		Energy		Energy
(in millions)	Energy		(Parent)		Carolinas		Progress		Florida		Ohio		Indiana		Piedmont
Facility size(a)	$	8,000	$	2,650	$	1,275	$	1,150	$	850	$	775	$	600	$	700
Reduction to backstop issuances
Commercial paper(b)	(1,611)		389		(375)		(253)		(527)		(419)		(150)		(276)
Outstanding letters of credit	(31)		(25)		(4)		(2)		—		—		—		—
Tax-exempt bonds	(81)		—		—		—		—		—		(81)		—
Available capacity under the Master Credit Facility	$	6,277	$	3,014	$	896	$	895	$	323	$	356	$	369	$	424

(a)Represents the sublimit of each borrower.

(b)Duke Energy issued $625 million of commercial paper and loaned the proceeds through the money pool to Duke Energy Carolinas, Duke Energy Progress, Duke Energy Ohio and Duke Energy Indiana. The balances are classified as Long-Term Debt Payable to Affiliated Companies on the Condensed Consolidated Balance Sheets.

	September 30, 2021
(in millions)	Facility size		Amount drawn
Duke Energy (Parent) Three-Year Revolving Credit Facility(a)	$	1,000	$	500

(a)During March 2021, Duke Energy extended the maturity date of the Three-Year Revolving Credit Facility from May 2022 to May 2024.

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Goodwill (Tables)

9 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill By Reportable Operating Segment

The following table presents the goodwill by reportable segment included on Duke Energy's Condensed Consolidated Balance Sheets at September 30, 2021, and December 31, 2020.

	Electric Utilities		Gas Utilities		Commercial
(in millions)	and Infrastructure		and Infrastructure		Renewables		Total
Goodwill balance	$	17,379	$	1,924	$	122	$	19,425
Accumulated impairment charges	—		—		(122)		(122)
Goodwill, adjusted for accumulated impairment charges	$	17,379	$	1,924	$	—	$	19,303

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Related Party Transactions (Tables)

9 Months Ended

Sep. 30, 2021

Related Party Transactions [Abstract]

Schedule of Related Party Transactions, Other Revenue and Expense

Material amounts related to transactions with related parties included on the Condensed Consolidated Statements of Operations and Comprehensive Income are presented in the following table.

	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2021		2020		2021		2020
Duke Energy Carolinas
Corporate governance and shared service expenses(a)	$	207	$	198	$	653	$	528
Indemnification coverages(b)	6		5		18		15
Joint Dispatch Agreement (JDA) revenue(c)	6		6		32		16
JDA expense(c)	68		28		133		72
Intercompany natural gas purchases(d)	14		10		43		26
Progress Energy
Corporate governance and shared service expenses(a)	$	201	$	185	$	615	$	520
Indemnification coverages(b)	10		9		31		27
JDA revenue(c)	68		28		133		72
JDA expense(c)	6		6		32		16
Intercompany natural gas purchases(d)	19		18		56		56
Duke Energy Progress
Corporate governance and shared service expenses(a)	$	121	$	113	$	367	$	301
Indemnification coverages(b)	4		4		14		13
JDA revenue(c)	68		28		133		72
JDA expense(c)	6		6		32		16
Intercompany natural gas purchases(d)	19		18		56		56
Duke Energy Florida
Corporate governance and shared service expenses(a)	$	80	$	72	$	248	$	219
Indemnification coverages(b)	6		5		17		14
Duke Energy Ohio
Corporate governance and shared service expenses(a)	$	79	$	80	$	237	$	241
Indemnification coverages(b)	1		1		3		3
Duke Energy Indiana
Corporate governance and shared service expenses(a)	$	96	$	102	$	302	$	300
Indemnification coverages(b)	2		2		6		6
Piedmont
Corporate governance and shared service expenses(a)	$	32	$	31	$	101	$	102
Indemnification coverages(b)	1		1		3		2
Intercompany natural gas sales(d)	33		28		99		82
Natural gas storage and transportation costs(e)	6		6		17		17

(a)The Subsidiary Registrants are charged their proportionate share of corporate governance and other shared services costs, primarily related to human resources, employee benefits, information technology, legal and accounting fees, as well as other third-party costs. These amounts are primarily recorded in Operation, maintenance and other and Impairment of assets and other charges on the Condensed Consolidated Statements of Operations and Comprehensive Income.

(b)The Subsidiary Registrants incur expenses related to certain indemnification coverages through Bison, Duke Energy’s wholly owned captive insurance subsidiary. These expenses are recorded in Operation, maintenance and other on the Condensed Consolidated Statements of Operations and Comprehensive Income.

(c)Duke Energy Carolinas and Duke Energy Progress participate in a JDA, which allows the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power and expenses from the purchase of power pursuant to the JDA are recorded in Operating Revenues and Fuel used in electric generation and purchased power, respectively, on the Condensed Consolidated Statements of Operations and Comprehensive Income.

(d)Piedmont provides long-term natural gas delivery service to certain Duke Energy Carolinas and Duke Energy Progress natural gas-fired generation facilities. Piedmont records the sales in Operating revenues, and Duke Energy Carolinas and Duke Energy Progress record the related purchases as a component of Fuel used in electric generation and purchased power on their respective Condensed Consolidated Statements of Operations and Comprehensive Income.

(e)Piedmont has related party transactions as a customer of its equity method investments in Pine Needle LNG Company, LLC, Hardy Storage Company, LLC and Cardinal Pipeline Company, LLC natural gas storage and transportation facilities. These expenses are included in Cost of natural gas on Piedmont's Condensed Consolidated Statements of Operations and Comprehensive Income.The following table includes the balance of intercompany income tax receivables and payables for the Subsidiary Registrants.

	Duke				Duke		Duke		Duke		Duke
	Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
September 30, 2021
Intercompany income tax receivable	$	—	$	36	$	—	$	8	$	1	$	—	$	14
Intercompany income tax payable	133		—		51		—		—		17		—
December 31, 2020
Intercompany income tax receivable	$	—	$	—	$	—	$	—	$	—	$	9	$	10
Intercompany income tax payable	31		33		46		35		2		—		—

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Derivatives and Hedging (Tables)

9 Months Ended

Sep. 30, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Notional Amounts of Outstanding Derivative Positions

The following table shows notional amounts of outstanding derivatives related to interest rate risk.

	September 30, 2021
			Duke				Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio
Cash flow hedges	$	2,094	$	—	$	—	$	—	$	—	$	—
Undesignated contracts	1,371		350		900		400		500		27
Total notional amount(a)	$	3,465	$	350	$	900	$	400	$	500	$	27

	December 31, 2020
			Duke				Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio
Cash flow hedges	$	632	$	—	$	—	$	—	$	—	$	—
Undesignated contracts	1,177		400		750		750		—		27
Total notional amount(a)	$	1,809	$	400	$	750	$	750	$	—	$	27

(a)Duke Energy includes amounts related to consolidated VIEs of $594 million in cash flow hedges and $94 million in undesignated contracts as of September 30, 2021, and $632 million in cash flow hedges as of December 31, 2020.

The tables below include volumes of outstanding commodity derivatives. Amounts disclosed represent the absolute value of notional volumes of commodity contracts excluding NPNS. The Duke Energy Registrants have netted contractual amounts where offsetting purchase and sale contracts exist with identical delivery locations and times of delivery. Where all commodity positions are perfectly offset, no quantities are shown.

	September 30, 2021
		Duke		Duke	Duke	Duke
	Duke	Energy	Progress	Energy	Energy	Energy
	Energy	Carolinas	Energy	Progress	Ohio	Indiana	Piedmont
Electricity (GWh)(a)	29,044	—	—	—	3,004	15,881	—
Natural gas (millions of dekatherms)	772	230	190	190	—	7	345

	December 31, 2020
		Duke		Duke	Duke	Duke
	Duke	Energy	Progress	Energy	Energy	Energy
	Energy	Carolinas	Energy	Progress	Ohio	Indiana	Piedmont
Electricity (GWh)(a)	35,409	—	—	—	2,559	10,802	—
Natural gas (millions of dekatherms)	678	145	158	158	—	2	373

(a)Duke Energy includes 10,159 GWh and 22,048 GWh related to cash flow hedges as of September 30, 2021, and December 31, 2020, respectively.

Location And Fair Value Of Derivatives Recognized in the Condensed Consolidated Balance Sheets

The following tables show the fair value and balance sheet location of derivative instruments. Although derivatives subject to master netting arrangements are netted on the Condensed Consolidated Balance Sheets, the fair values presented below are shown gross and cash collateral on the derivatives has not been netted against the fair values shown.

Derivative Assets	September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Commodity Contracts
Not Designated as Hedging Instruments
Current	$	359	$	171	$	135	$	135	$	—	$	4	$	36	$	12
Noncurrent	177		100		78		78		—		—		—		—
Total Derivative Assets – Commodity Contracts	$	536	$	271	$	213	$	213	$	—	$	4	$	36	$	12
Interest Rate Contracts
Designated as Hedging Instruments
Current	$	2	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Noncurrent	3		—		—		—		—		—		—		—
Not Designated as Hedging Instruments
Current	$	2	$	—	$	2	$	2	$	—	$	—	$	—	$	—
Total Derivative Assets – Interest Rate Contracts	$	7	$	—	$	2	$	2	$	—	$	—	$	—	$	—
Total Derivative Assets	$	543	$	271	$	215	$	215	$	—	$	4	$	36	$	12

Derivative Liabilities	September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Commodity Contracts
Designated as Hedging Instruments
Current	$	37	$	—	$	—	$	—	$	—	$	—	$	—	—
Noncurrent	120		—		—		—		—		—		—		—
Not Designated as Hedging Instruments
Current	$	33	$	12	$	—	$	—	$	—	$	—	$	2	$	20
Noncurrent	128		—		—		—		—		—		—		128
Total Derivative Liabilities – Commodity Contracts	$	318	$	12	$	—	$	—	$	—	$	—	$	2	$	148
Interest Rate Contracts
Designated as Hedging Instruments
Current	$	45	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Noncurrent	29		—		—		—		—		—		—		—
Not Designated as Hedging Instruments
Current	19		6		12		—		12		1		—		—
Noncurrent	4		—		—		—		—		4		—		—
Total Derivative Liabilities – Interest Rate Contracts	$	97	$	6	$	12	$	—	$	12	$	5	$	—	$	—
Total Derivative Liabilities	$	415	$	18	$	12	$	—	$	12	$	5	$	2	$	148

Derivative Assets	December 31, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Commodity Contracts
Not Designated as Hedging Instruments
Current	$	30	$	14	$	9	$	9	$	—	$	1	$	6	$	1
Noncurrent	13		6		6		6		—		—		—		—
Total Derivative Assets – Commodity Contracts	$	43	$	20	$	15	$	15	$	—	$	1	$	6	$	1
Interest Rate Contracts
Not Designated as Hedging Instruments
Current	$	18	$	—	$	18	$	18	$	—	$	—	$	—	$	—
Total Derivative Assets – Interest Rate Contracts	$	18	$	—	$	18	$	18	$	—	$	—	$	—	$	—
Total Derivative Assets	$	61	$	20	$	33	$	33	$	—	$	1	$	6	$	1

Derivative Liabilities	December 31, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Commodity Contracts
Designated as Hedging Instruments
Current	$	14	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Noncurrent	70		—		—		—		—		—		—		—
Not Designated as Hedging Instruments
Current	$	30	$	13	$	2	$	2	$	—	$	—	$	1	$	15
Noncurrent	137		3		27		12		—		—		—		107
Total Derivative Liabilities – Commodity Contracts	$	251	$	16	$	29	$	14	$	—	$	—	$	1	$	122
Interest Rate Contracts
Designated as Hedging Instruments
Current	$	15	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Noncurrent	48		—		—		—		—		—		—		—
Not Designated as Hedging Instruments
Current	5		4		—		—		—		1		—		—
Noncurrent	5		—		—		—		—		5		—		—
Total Derivative Liabilities – Interest Rate Contracts	$	73	$	4	$	—	$	—	$	—	$	6	$	—	$	—
Total Derivative Liabilities	$	324	$	20	$	29	$	14	$	—	$	6	$	1	$	122

Offsetting Assets

The following tables present the line items on the Condensed Consolidated Balance Sheets where derivatives are reported. Substantially all of Duke Energy's outstanding derivative contracts are subject to enforceable master netting arrangements. The gross amounts offset in the tables below show the effect of these netting arrangements on financial position, and include collateral posted to offset the net position. The amounts shown are calculated by counterparty. Accounts receivable or accounts payable may also be available to offset exposures in the event of bankruptcy. These amounts are not included in the tables below.

Derivative Assets	September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Current
Gross amounts recognized	$	363	$	171	$	137	$	137	$	—	$	4	$	36	$	12
Gross amounts offset	(143)		(87)		(56)		(56)		—		—		—		—
Net amounts presented in Current Assets: Other	$	220	$	84	$	81	$	81	$	—	$	4	$	36	$	12
Noncurrent
Gross amounts recognized	$	180	$	100	$	78	$	78	$	—	$	—	$	—	$	—
Gross amounts offset	(71)		(45)		(26)		(26)		—		—		—		—
Net amounts presented in Other Noncurrent Assets: Other	$	109	$	55	$	52	$	52	$	—	$	—	$	—	$	—

Derivative Liabilities	September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Current
Gross amounts recognized	$	134	$	18	$	12	$	—	$	12	$	1	$	2	$	20
Gross amounts offset	—		—		—		—		—		—		—		—
Net amounts presented in Current Liabilities: Other	$	134	$	18	$	12	$	—	$	12	$	1	$	2	$	20
Noncurrent
Gross amounts recognized	$	281	$	—	$	—	$	—	$	—	$	4	$	—	$	128
Gross amounts offset	—		—		—		—		—		—		—		—
Net amounts presented in Other Noncurrent Liabilities: Other	$	281	$	—	$	—	$	—	$	—	$	4	$	—	$	128

Derivative Assets	December 31, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Current
Gross amounts recognized	$	48	$	14	$	27	$	27	$	—	$	1	$	6	$	1
Gross amounts offset	(3)		(2)		(2)		(2)		—		—		—		—
Net amounts presented in Current Assets: Other	$	45	$	12	$	25	$	25	$	—	$	1	$	6	$	1
Noncurrent
Gross amounts recognized	$	13	$	6	$	6	$	6	$	—	$	—	$	—	$	—
Gross amounts offset	(5)		(1)		(4)		(4)		—		—		—		—
Net amounts presented in Other Noncurrent Assets: Other	$	8	$	5	$	2	$	2	$	—	$	—	$	—	$	—

Derivative Liabilities	December 31, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Current
Gross amounts recognized	$	64	$	17	$	2	$	2	$	—	$	1	$	1	$	15
Gross amounts offset	(3)		(2)		(2)		(2)		—		—		—		—
Net amounts presented in Current Liabilities: Other	$	61	$	15	$	—	$	—	$	—	$	1	$	1	$	15
Noncurrent
Gross amounts recognized	$	260	$	3	$	27	$	12	$	—	$	5	$	—	$	107
Gross amounts offset	(5)		(1)		(4)		(4)		—		—		—		—
Net amounts presented in Other Noncurrent Liabilities: Other	$	255	$	2	$	23	$	8	$	—	$	5	$	—	$	107

Offsetting Liabilities

The following tables present the line items on the Condensed Consolidated Balance Sheets where derivatives are reported. Substantially all of Duke Energy's outstanding derivative contracts are subject to enforceable master netting arrangements. The gross amounts offset in the tables below show the effect of these netting arrangements on financial position, and include collateral posted to offset the net position. The amounts shown are calculated by counterparty. Accounts receivable or accounts payable may also be available to offset exposures in the event of bankruptcy. These amounts are not included in the tables below.

Derivative Assets	September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Current
Gross amounts recognized	$	363	$	171	$	137	$	137	$	—	$	4	$	36	$	12
Gross amounts offset	(143)		(87)		(56)		(56)		—		—		—		—
Net amounts presented in Current Assets: Other	$	220	$	84	$	81	$	81	$	—	$	4	$	36	$	12
Noncurrent
Gross amounts recognized	$	180	$	100	$	78	$	78	$	—	$	—	$	—	$	—
Gross amounts offset	(71)		(45)		(26)		(26)		—		—		—		—
Net amounts presented in Other Noncurrent Assets: Other	$	109	$	55	$	52	$	52	$	—	$	—	$	—	$	—

Derivative Liabilities	September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Current
Gross amounts recognized	$	134	$	18	$	12	$	—	$	12	$	1	$	2	$	20
Gross amounts offset	—		—		—		—		—		—		—		—
Net amounts presented in Current Liabilities: Other	$	134	$	18	$	12	$	—	$	12	$	1	$	2	$	20
Noncurrent
Gross amounts recognized	$	281	$	—	$	—	$	—	$	—	$	4	$	—	$	128
Gross amounts offset	—		—		—		—		—		—		—		—
Net amounts presented in Other Noncurrent Liabilities: Other	$	281	$	—	$	—	$	—	$	—	$	4	$	—	$	128

Derivative Assets	December 31, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Current
Gross amounts recognized	$	48	$	14	$	27	$	27	$	—	$	1	$	6	$	1
Gross amounts offset	(3)		(2)		(2)		(2)		—		—		—		—
Net amounts presented in Current Assets: Other	$	45	$	12	$	25	$	25	$	—	$	1	$	6	$	1
Noncurrent
Gross amounts recognized	$	13	$	6	$	6	$	6	$	—	$	—	$	—	$	—
Gross amounts offset	(5)		(1)		(4)		(4)		—		—		—		—
Net amounts presented in Other Noncurrent Assets: Other	$	8	$	5	$	2	$	2	$	—	$	—	$	—	$	—

Derivative Liabilities	December 31, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Current
Gross amounts recognized	$	64	$	17	$	2	$	2	$	—	$	1	$	1	$	15
Gross amounts offset	(3)		(2)		(2)		(2)		—		—		—		—
Net amounts presented in Current Liabilities: Other	$	61	$	15	$	—	$	—	$	—	$	1	$	1	$	15
Noncurrent
Gross amounts recognized	$	260	$	3	$	27	$	12	$	—	$	5	$	—	$	107
Gross amounts offset	(5)		(1)		(4)		(4)		—		—		—		—
Net amounts presented in Other Noncurrent Liabilities: Other	$	255	$	2	$	23	$	8	$	—	$	5	$	—	$	107

XML

Investments in Debt and Equity Securities (Tables)

9 Months Ended

Sep. 30, 2021

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Trading, and Equity Securities, FV-NI

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	164	$	—	$	—	$	177
Equity securities	4,700		35		6,754		4,138		54		6,235
Corporate debt securities	44		5		847		76		1		806
Municipal bonds	13		1		296		22		—		370
U.S. government bonds	34		8		1,605		51		—		1,361
Other debt securities	4		1		195		8		—		180
Total NDTF Investments	$	4,795	$	50	$	9,861	$	4,295	$	55	$	9,129
Other Investments
Cash and cash equivalents	$	—	$	—	$	87	$	—	$	—	$	127
Equity securities	83		—		145		79		—		146
Corporate debt securities	4		1		130		8		—		110
Municipal bonds	3		1		69		5		—		86
U.S. government bonds	—		—		50		—		—		42
Other debt securities	—		—		34		—		—		47
Total Other Investments	$	90	$	2	$	515	$	92	$	—	$	558
Total Investments	$	4,885	$	52	$	10,376	$	4,387	$	55	$	9,687

Debt Securities, Available-for-sale

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	164	$	—	$	—	$	177
Equity securities	4,700		35		6,754		4,138		54		6,235
Corporate debt securities	44		5		847		76		1		806
Municipal bonds	13		1		296		22		—		370
U.S. government bonds	34		8		1,605		51		—		1,361
Other debt securities	4		1		195		8		—		180
Total NDTF Investments	$	4,795	$	50	$	9,861	$	4,295	$	55	$	9,129
Other Investments
Cash and cash equivalents	$	—	$	—	$	87	$	—	$	—	$	127
Equity securities	83		—		145		79		—		146
Corporate debt securities	4		1		130		8		—		110
Municipal bonds	3		1		69		5		—		86
U.S. government bonds	—		—		50		—		—		42
Other debt securities	—		—		34		—		—		47
Total Other Investments	$	90	$	2	$	515	$	92	$	—	$	558
Total Investments	$	4,885	$	52	$	10,376	$	4,387	$	55	$	9,687

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2021, and 2020, were as follows.

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
FV-NI:
Realized gains	$	34	$	13	$	320	$	338
Realized losses	40		16		100		148
AFS:
Realized gains	17		26		51		73
Realized losses	15		19		46		38

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.

	September 30, 2021
			Duke				Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Indiana
Due in one year or less	$	151	$	3	$	121	$	22	$	99	$	5
Due after one through five years	954		343		548		244		304		18
Due after five through 10 years	639		268		286		247		39		8
Due after 10 years	1,482		847		553		517		36		15
Total	$	3,226	$	1,461	$	1,508	$	1,030	$	478	$	46

Duke Energy Carolinas

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Trading, and Equity Securities, FV-NI

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	60	$	—	$	—	$	30
Equity securities	2,725		14		3,912		2,442		23		3,685
Corporate debt securities	27		3		495		49		1		510
Municipal bonds	1		—		24		6		—		91
U.S. government bonds	18		2		752		25		—		475
Other debt securities	4		1		190		7		—		174
Total NDTF Investments	$	2,775	$	20	$	5,433	$	2,529	$	24	$	4,965

Debt Securities, Available-for-sale

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	60	$	—	$	—	$	30
Equity securities	2,725		14		3,912		2,442		23		3,685
Corporate debt securities	27		3		495		49		1		510
Municipal bonds	1		—		24		6		—		91
U.S. government bonds	18		2		752		25		—		475
Other debt securities	4		1		190		7		—		174
Total NDTF Investments	$	2,775	$	20	$	5,433	$	2,529	$	24	$	4,965

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2021, and 2020, were as follows.

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
FV-NI:
Realized gains	$	25	$	10	$	243	$	46
Realized losses	29		12		68		82
AFS:
Realized gains	10		20		35		50
Realized losses	10		17		32		30

Progress Energy

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Trading, and Equity Securities, FV-NI

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	104	$	—	$	—	$	147
Equity securities	1,975		21		2,842		1,696		31		2,550
Corporate debt securities	17		2		352		27		—		296
Municipal bonds	12		1		272		16		—		279
U.S. government bonds	16		6		853		26		—		886
Other debt securities	—		—		5		1		—		6
Total NDTF Investments	$	2,020	$	30	$	4,428	$	1,766	$	31	$	4,164
Other Investments
Cash and cash equivalents	$	—	$	—	$	18	$	—	$	—	$	106
Municipal bonds	2		—		26		3		—		26
Total Other Investments	$	2	$	—	$	44	$	3	$	—	$	132
Total Investments	$	2,022	$	30	$	4,472	$	1,769	$	31	$	4,296

Debt Securities, Available-for-sale

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	104	$	—	$	—	$	147
Equity securities	1,975		21		2,842		1,696		31		2,550
Corporate debt securities	17		2		352		27		—		296
Municipal bonds	12		1		272		16		—		279
U.S. government bonds	16		6		853		26		—		886
Other debt securities	—		—		5		1		—		6
Total NDTF Investments	$	2,020	$	30	$	4,428	$	1,766	$	31	$	4,164
Other Investments
Cash and cash equivalents	$	—	$	—	$	18	$	—	$	—	$	106
Municipal bonds	2		—		26		3		—		26
Total Other Investments	$	2	$	—	$	44	$	3	$	—	$	132
Total Investments	$	2,022	$	30	$	4,472	$	1,769	$	31	$	4,296

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2021, and 2020, were as follows.

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
FV-NI:
Realized gains	$	9	$	3	$	77	$	292
Realized losses	11		4		32		66
AFS:
Realized gains	7		6		14		17
Realized losses	6		2		12		7

Duke Energy Progress

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Trading, and Equity Securities, FV-NI

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	92	$	—	$	—	$	76
Equity securities	1,882		21		2,736		1,617		31		2,459
Corporate debt securities	17		2		287		27		—		296
Municipal bonds	12		1		272		16		—		279
U.S. government bonds	16		2		466		26		—		412
Other debt securities	—		—		5		1		—		6
Total NDTF Investments	$	1,927	$	26	$	3,858	$	1,687	$	31	$	3,528
Other Investments
Cash and cash equivalents	$	—	$	—	$	16	$	—	$	—	$	1
Total Other Investments	$	—	$	—	$	16	$	—	$	—	$	1
Total Investments	$	1,927	$	26	$	3,874	$	1,687	$	31	$	3,529

Debt Securities, Available-for-sale

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	92	$	—	$	—	$	76
Equity securities	1,882		21		2,736		1,617		31		2,459
Corporate debt securities	17		2		287		27		—		296
Municipal bonds	12		1		272		16		—		279
U.S. government bonds	16		2		466		26		—		412
Other debt securities	—		—		5		1		—		6
Total NDTF Investments	$	1,927	$	26	$	3,858	$	1,687	$	31	$	3,528
Other Investments
Cash and cash equivalents	$	—	$	—	$	16	$	—	$	—	$	1
Total Other Investments	$	—	$	—	$	16	$	—	$	—	$	1
Total Investments	$	1,927	$	26	$	3,874	$	1,687	$	31	$	3,529

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2021, and 2020, were as follows.

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
FV-NI:
Realized gains	$	9	$	3	$	76	$	43
Realized losses	11		4		31		51
AFS:
Realized gains	6		6		13		17
Realized losses	5		2		11		7

Duke Energy Florida

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Trading, and Equity Securities, FV-NI

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	12	$	—	$	—	$	71
Equity securities	93		—		106		79		—		91
Corporate debt securities	—		—		65		—		—		—
U.S. government bonds	—		4		387		—		—		474
Total NDTF Investments(a)	$	93	$	4	$	570	$	79	$	—	$	636
Other Investments
Cash and cash equivalents	$	—	$	—	$	1	$	—	$	—	$	1
Municipal bonds	2		—		26		3		—		26
Total Other Investments	$	2	$	—	$	27	$	3	$	—	$	27
Total Investments	$	95	$	4	$	597	$	82	$	—	$	663

(a)During the nine months ended September 30, 2021, and the year ended December 31, 2020, Duke Energy Florida received reimbursements from the NDTF for costs related to ongoing decommissioning activity of Crystal River Unit 3.

Debt Securities, Available-for-sale

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	12	$	—	$	—	$	71
Equity securities	93		—		106		79		—		91
Corporate debt securities	—		—		65		—		—		—
U.S. government bonds	—		4		387		—		—		474
Total NDTF Investments(a)	$	93	$	4	$	570	$	79	$	—	$	636
Other Investments
Cash and cash equivalents	$	—	$	—	$	1	$	—	$	—	$	1
Municipal bonds	2		—		26		3		—		26
Total Other Investments	$	2	$	—	$	27	$	3	$	—	$	27
Total Investments	$	95	$	4	$	597	$	82	$	—	$	663

(a)During the nine months ended September 30, 2021, and the year ended December 31, 2020, Duke Energy Florida received reimbursements from the NDTF for costs related to ongoing decommissioning activity of Crystal River Unit 3.

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2021, and 2020, were as follows:

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
FV-NI:
Realized gains	$	—	$	—	$	1	$	249
Realized losses	—		—		1		15
AFS:
Realized gains	1		—		1		—
Realized losses	1		—		1		—

Duke Energy Indiana

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Trading, and Equity Securities, FV-NI

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are measured at FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
Investments
Cash and cash equivalents	$	—	$	—	$	19	$	—	$	—	$	1
Equity securities	56		—		90		58		—		97
Corporate debt securities	—		—		5		—		—		3
Municipal bonds	1		1		36		1		—		38
U.S. government bonds	—		—		5		—		—		4
Total Investments	$	57	$	1	$	155	$	59	$	—	$	143

Debt Securities, Available-for-sale

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are measured at FV-NI and debt investments are classified as AFS.

	September 30, 2021						December 31, 2020
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
Investments
Cash and cash equivalents	$	—	$	—	$	19	$	—	$	—	$	1
Equity securities	56		—		90		58		—		97
Corporate debt securities	—		—		5		—		—		3
Municipal bonds	1		1		36		1		—		38
U.S. government bonds	—		—		5		—		—		4
Total Investments	$	57	$	1	$	155	$	59	$	—	$	143

XML

Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2021

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. Derivative amounts in the tables below for all Duke Energy Registrants exclude cash collateral, which is disclosed in Note 8. See Note 9 for additional information related to investments by major security type for the Duke Energy Registrants.

	September 30, 2021
(in millions)	Total Fair Value		Level 1		Level 2		Level 3		Not Categorized
NDTF cash and cash equivalents	$	164	$	164	$	—	$	—	$	—
NDTF equity securities	6,754		6,705		—		—		49
NDTF debt securities	2,943		998		1,945		—		—
Other equity securities	145		145		—		—		—
Other debt securities	283		45		238		—		—
Other cash and cash equivalents	87		87		—		—		—
Derivative assets	543		27		490		26		—
Total assets	10,919		8,171		2,673		26		49
Derivative liabilities	(415)		(2)		(256)		(157)		—
Net assets (liabilities)	$	10,504	$	8,169	$	2,417	$	(131)	$	49

	December 31, 2020
(in millions)	Total Fair Value		Level 1		Level 2		Level 3		Not Categorized
NDTF cash and cash equivalents	$	177	$	177	$	—	$	—	$	—
NDTF equity securities	6,235		6,189		—		—		46
NDTF debt securities	2,717		874		1,843		—		—
Other equity securities	146		146		—		—		—
Other debt securities	285		37		248		—		—
Other cash and cash equivalents	127		127		—		—		—
Derivative assets	61		1		53		7		—
Total assets	9,748		7,551		2,144		7		46
Derivative liabilities	(324)		—		(240)		(84)		—
Net assets (liabilities)	$	9,424	$	7,551	$	1,904	$	(77)	$	46

Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs

The following tables provide reconciliations of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements.

	Derivatives (net)
	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2021		2020		2021		2020
Balance at beginning of period	$	(131)	$	(92)	$	(77)	$	(102)
Total pretax realized or unrealized losses included in comprehensive income	(11)		(102)		(86)		(102)
Purchases, sales, issuances and settlements:
Purchases	—		—		21		14
Settlements	4		(3)		(4)		(18)
Total gains (losses) included on the Condensed Consolidated Balance Sheet	7		(6)		15		5
Balance at end of period	$	(131)	$	(203)	$	(131)	$	(203)

Quantitative Information Table - Level 3

The following tables include quantitative information about the Duke Energy Registrants' derivatives classified as Level 3.

	September 30, 2021
										Weighted
	Fair Value									Average
Investment Type	(in millions)		Valuation Technique	Unobservable Input	Range					Range
Duke Energy
Electricity contracts	$	(157)	RTO forward pricing	Forward electricity curves – price per MWh	$	18.02	-	$	143.85	$	38.43
Duke Energy Ohio
FTRs	2		RTO auction pricing	FTR price – per MWh	0.06		-	1.27		0.71
Duke Energy Indiana
FTRs	24		RTO auction pricing	FTR price – per MWh	(1.11)		-	8.55		1.61
Duke Energy
Total Level 3 derivatives	$	(131)

	December 31, 2020
									Weighted
	Fair Value								Average
Investment Type	(in millions)		Valuation Technique	Unobservable Input	Range				Range
Duke Energy
Electricity contracts	$	(84)	Discounted cash flow	Forward electricity curves – price per MWh	$	14.68	-	$151.84	$28.84
Duke Energy Ohio
FTRs	1		RTO auction pricing	FTR price – per MWh	0.25		-	1.68	0.79
Duke Energy Indiana
FTRs	6		RTO auction pricing	FTR price – per MWh	(2.40)		-	7.41	1.05
Duke Energy
Total Level 3 derivatives	$	(77)

Schedule Of Long Term Debt Fair Value

The fair value and book value of long-term debt, including current maturities, is summarized in the following table. Estimates determined are not necessarily indicative of amounts that could have been settled in current markets. Fair value of long-term debt uses Level 2 measurements.

	September 30, 2021				December 31, 2020
(in millions)	Book Value		Fair Value		Book Value		Fair Value
Duke Energy(a)	$	62,802	$	69,381	$	59,863	$	69,292
Duke Energy Carolinas	12,975		14,964		12,218		14,917
Progress Energy	19,488		22,593		19,264		23,470
Duke Energy Progress	9,848		10,915		9,258		10,862
Duke Energy Florida	7,549		8,932		7,915		9,756
Duke Energy Ohio	3,092		3,517		3,089		3,650
Duke Energy Indiana	4,092		4,883		4,091		5,204
Piedmont	2,968		3,320		2,780		3,306

(a)Book value of long-term debt includes $1.3 billion at September 30, 2021, and December 31, 2020, of net unamortized debt discount and premium of purchase accounting adjustments related to the mergers with Progress Energy and Piedmont that are excluded from fair value of long-term debt.

Duke Energy Carolinas

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.

	September 30, 2021
(in millions)	Total Fair Value		Level 1		Level 2		Not Categorized
NDTF cash and cash equivalents	$	60	$	60	$	—	$	—
NDTF equity securities	3,912		3,863		—		49
NDTF debt securities	1,461		359		1,102		—
Derivative assets	271		—		271		—
Total assets	5,704		4,282		1,373		49
Derivative liabilities	(18)		—		(18)		—
Net assets	$	5,686	$	4,282	$	1,355	$	49

	December 31, 2020
(in millions)	Total Fair Value		Level 1		Level 2		Not Categorized
NDTF cash and cash equivalents	$	30	$	30	$	—	$	—
NDTF equity securities	3,685		3,639		—		46
NDTF debt securities	1,250		192		1,058		—
Derivative assets	20		—		20		—
Total assets	4,985		3,861		1,078		46
Derivative liabilities	(20)		—		(20)		—
Net assets	$	4,965	$	3,861	$	1,058	$	46

Progress Energy

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.

	September 30, 2021						December 31, 2020
(in millions)	Total Fair Value		Level 1		Level 2		Total Fair Value		Level 1		Level 2
NDTF cash and cash equivalents	$	104	$	104	$	—	$	147	$	147	$	—
NDTF equity securities	2,842		2,842		—		2,550		2,550		—
NDTF debt securities	1,482		639		843		1,467		682		785
Other debt securities	26		—		26		26		—		26
Other cash and cash equivalents	18		18		—		106		106		—
Derivative assets	215		—		215		33		—		33
Total assets	4,687		3,603		1,084		4,329		3,485		844
Derivative liabilities	(12)		—		(12)		(29)		—		(29)
Net assets	$	4,675	$	3,603	$	1,072	$	4,300	$	3,485	$	815

Duke Energy Progress

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.

	September 30, 2021						December 31, 2020
(in millions)	Total Fair Value		Level 1		Level 2		Total Fair Value		Level 1		Level 2
NDTF cash and cash equivalents	$	92	$	92	$	—	$	76	$	76	$	—
NDTF equity securities	2,736		2,736		—		2,459		2,459		—
NDTF debt securities	1,030		278		752		993		237		756
Other cash and cash equivalents	16		16		—		1		1		—
Derivative assets	215		—		215		33		—		33
Total assets	4,089		3,122		967		3,562		2,773		789
Derivative liabilities	—		—		—		(14)		—		(14)
Net assets	$	4,089	$	3,122	$	967	$	3,548	$	2,773	$	775

Duke Energy Florida

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.

	September 30, 2021						December 31, 2020
(in millions)	Total Fair Value		Level 1		Level 2		Total Fair Value		Level 1		Level 2
NDTF cash and cash equivalents	$	12	$	12	$	—	$	71	$	71	$	—
NDTF equity securities	106		106		—		91		91		—
NDTF debt securities	452		361		91		474		445		29
Other debt securities	26		—		26		26		—		26
Other cash and cash equivalents	1		1		—		1		1		—
Total assets	597		480		117		663		608		55
Derivative liabilities	(12)		—		(12)		—		—		—
Net assets	$	585	$	480	$	105	$	663	$	608	$	55

Duke Energy Indiana

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.

	September 30, 2021								December 31, 2020
(in millions)	Total Fair Value		Level 1		Level 2		Level 3		Total Fair Value		Level 1		Level 2		Level 3
Other equity securities	$	90	$	90	$	—	$	—	$	97	$	97	$	—	$	—
Other debt securities	46		—		46		—		45		—		45		—
Other cash and cash equivalents	19		19		—		—		1		1		—		—
Derivative assets	36		12		—		24		6		—		—		6
Total assets	191		121		46		24		149		98		45		6
Derivative liabilities	(2)		(2)		—		—		(1)		(1)		—		—
Net assets	$	189	$	119	$	46	$	24	$	148	$	97	$	45	$	6

Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs

The following table provides a reconciliation of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements.

	Derivatives (net)
	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2021		2020		2021		2020
Balance at beginning of period	$	22	$	10	$	6	$	11
Purchases, sales, issuances and settlements:
Purchases	—		—		18		10
Settlements	(3)		(3)		(12)		(13)
Total gains included on the Condensed Consolidated Balance Sheet	5		1		12		—
Balance at end of period	$	24	$	8	$	24	$	8

Piedmont

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.

	September 30, 2021						December 31, 2020
(in millions)	Total Fair Value		Level 1		Level 2		Total Fair Value		Level 1		Level 2
Derivative assets	$	12	$	12	$	—	$	1	$	1	$	—
Derivative liabilities	(148)		—		(148)		(122)		—		(122)
Net (liabilities) assets	$	(136)	$	12	$	(148)	$	(121)	$	1	$	(122)

Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs

The following table provides a reconciliation of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements.

	Derivatives (net)
	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2021		2020		2021		2020
Balance at beginning of period	$	—	$	(105)	$	—	$	(117)
Total (losses) gains and settlements	—		(6)		—		6
Balance at end of period	$	—	$	(111)	$	—	$	(111)

XML

Variable Interest Entities (Tables)

9 Months Ended

Sep. 30, 2021

VIE primary beneficiary

Variable Interest Entities [Line Items]

Schedule Of Variable Interest Entities

The following table summarizes the amounts and expiration dates of the credit facilities and associated restricted receivables described above.

	Duke Energy
			Duke Energy		Duke Energy		Duke Energy
			Carolinas		Progress		Florida
(in millions)	CRC		DERF		DEPR		DEFR
Expiration date	February 2023		December 2022		April 2023		April 2023
Credit facility amount	$	350	$	475	$	350	$	250
Amounts borrowed at September 30, 2021	350		475		350		250
Amounts borrowed at December 31, 2020	350		364		250		250
Restricted Receivables at September 30, 2021	535		915		532		443
Restricted Receivables at December 31, 2020	547		696		500		397

VIE not primary beneficiary

Variable Interest Entities [Line Items]

Schedule Of Variable Interest Entities

The following tables summarize the impact of non-consolidated VIEs on the Condensed Consolidated Balance Sheets.

	September 30, 2021
	Duke Energy						Duke		Duke
	Pipeline		Commercial				Energy		Energy
(in millions)	Investments		Renewables		Total		Ohio		Indiana
Receivables from affiliated companies	$	—	$	—	$	—	$	47	$	77
Investments in equity method unconsolidated affiliates	15		465		480		—		—
Deferred tax asset	58		—		58		—		—
Total assets	$	73	$	465	$	538	$	47	$	77
Other current liabilities	61		3		64		—		—
Other noncurrent liabilities	63		3		66		—		—
Total liabilities	$	124	$	6	$	130	$	—	$	—
Net (liabilities) assets	$	(51)	$	459	$	408	$	47	$	77

	December 31, 2020
	Duke Energy						Duke		Duke
	Pipeline		Commercial				Energy		Energy
(in millions)	Investments		Renewables		Total		Ohio		Indiana
Receivables from affiliated companies	$	—	$	—	$	—	$	83	$	110
Investments in equity method unconsolidated affiliates	—		530		530		—		—
Other noncurrent assets	31		—		31		—		—
Total assets	$	31	$	530	$	561	$	83	$	110
Other current liabilities	928		5		933		—		—
Other noncurrent liabilities	8		10		18		—		—
Total liabilities	$	936	$	15	$	951	$	—	$	—
Net assets (liabilities)	$	(905)	$	515	$	(390)	$	83	$	110

DEFPF | VIE primary beneficiary

Variable Interest Entities [Line Items]

Schedule Of Variable Interest Entities

The following table summarizes the impact of DEFPF on Duke Energy Florida's Condensed Consolidated Balance Sheets.

(in millions)	September 30, 2021		December 31, 2020
Receivables of VIEs	$	6	$	4
Regulatory Assets: Current	54		53
Current Assets: Other	17		39
Other Noncurrent Assets: Regulatory assets	896		937
Current Liabilities: Other	2		10
Current maturities of long-term debt	56		55
Long-Term Debt	946		1,002

Commercial Renewables | VIE primary beneficiary

Variable Interest Entities [Line Items]

Schedule Of Variable Interest Entities

The table below presents material balances reported on Duke Energy's Condensed Consolidated Balance Sheets related to Commercial Renewables VIEs.

(in millions)	September 30, 2021		December 31, 2020
Current Assets: Other	$	330	$	257
Property, Plant and Equipment: Cost	7,315		6,394
Accumulated depreciation and amortization	(1,414)		(1,242)
Other Noncurrent Assets: Other	110		67
Current maturities of long-term debt	165		167
Long-Term Debt	1,552		1,569
Other Noncurrent Liabilities: AROs	167		148
Other Noncurrent Liabilities: Other	341		316

CRC | VIE not primary beneficiary

Variable Interest Entities [Line Items]

Schedule Of Variable Interest Entities

The following table shows the gross and net receivables sold.

	Duke Energy Ohio				Duke Energy Indiana
(in millions)	September 30, 2021		December 31, 2020		September 30, 2021		December 31, 2020
Receivables sold	$	218	$	270	$	328	$	344
Less: Retained interests	47		83		77		110
Net receivables sold	$	171	$	187	$	251	$	234

The following table shows sales and cash flows related to receivables sold.

	Duke Energy Ohio								Duke Energy Indiana
	Three Months Ended				Nine Months Ended				Three Months Ended				Nine Months Ended
	September 30,				September 30,				September 30,				September 30,
(in millions)	2021		2020		2021		2020		2021		2020		2021		2020
Sales
Receivables sold	$	486	$	462	$	1,490	$	1,428	$	794	$	717	$	2,176	$	1,947
Loss recognized on sale	2		2		7		8		4		3		10		9
Cash flows
Cash proceeds from receivables sold	$	490	$	449	$	1,519	$	1,439	$	798	$	689	$	2,199	$	1,941
Collection fees received	—		1		1		1		—		—		1		1
Return received on retained interests	1		1		3		3		1		1		4		4

XML

Revenue (Tables)

9 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction

Supplemental requirements contracts that include contracted blocks of energy and capacity at contractually fixed prices have the following estimated remaining performance obligations:

	Remaining Performance Obligations
(in millions)	2021		2022		2023		2024		2025		Thereafter		Total
Progress Energy	$	24	$	107	$	44	$	45	$	7	$	51	$	278
Duke Energy Progress	2		8		8		8		—		—		26
Duke Energy Florida	22		99		36		37		7		51		252
Duke Energy Indiana	—		1		9		14		15		25		64

Estimated remaining performance obligations are as follows:

	Remaining Performance Obligations
(in millions)	2021		2022		2023		2024		2025		Thereafter		Total
Piedmont	$	17	$	67	$	64	$	61	$	60	$	336	$	605

Disaggregation of Revenue

Disaggregated revenues are presented as follows:

	Three Months Ended September 30, 2021
			Duke				Duke		Duke		Duke		Duke
(in millions)	Duke		Energy		Progress		Energy		Energy		Energy		Energy
By market or type of customer	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Electric Utilities and Infrastructure
Residential	$	2,955	$	892	$	1,525	$	619	$	906	$	223	$	316	$	—
General	1,873		685		826		400		426		119		240		—
Industrial	861		360		264		195		69		35		202		—
Wholesale	619		111		399		324		75		19		89		—
Other revenues	252		72		198		118		80		17		23		—
Total Electric Utilities and Infrastructure revenue from contracts with customers	$	6,560	$	2,120	$	3,212	$	1,656	$	1,556	$	413	$	870	$	—
Gas Utilities and Infrastructure
Residential	$	129	$	—	$	—	$	—	$	—	$	62	$	—	$	66
Commercial	78		—		—		—		—		24		—		58
Industrial	30		—		—		—		—		3		—		26
Power Generation	—		—		—		—		—		—		—		23
Other revenues	33		—		—		—		—		4		—		9
Total Gas Utilities and Infrastructure revenue from contracts with customers	$	270	$	—	$	—	$	—	$	—	$	93	$	—	$	182
Commercial Renewables
Revenue from contracts with customers	$	56	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other
Revenue from contracts with customers	$	8	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Total revenue from contracts with customers	$	6,894	$	2,120	$	3,212	$	1,656	$	1,556	$	506	$	870	$	182
Other revenue sources(a)	$	57	$	(16)	$	21	$	11	$	5	$	—	$	16	$	13
Total revenues	$	6,951	$	2,104	$	3,233	$	1,667	$	1,561	$	506	$	886	$	195

(a)Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues.

	Three Months Ended September 30, 2020
			Duke				Duke		Duke		Duke		Duke
(in millions)	Duke		Energy		Progress		Energy		Energy		Energy		Energy
By market or type of customer	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Electric Utilities and Infrastructure
Residential	$	2,936	$	883	$	1,550	$	616	$	934	$	213	$	289	$	—
General	1,804		664		805		384		421		119		212		—
Industrial	797		342		245		179		66		35		175		—
Wholesale	603		117		412		358		54		10		64		—
Other revenues	238		62		167		75		92		23		22		—
Total Electric Utilities and Infrastructure revenue from contracts with customers	$	6,378	$	2,068	$	3,179	$	1,612	$	1,567	$	400	$	762	$	—
Gas Utilities and Infrastructure
Residential	$	112	$	—	$	—	$	—	$	—	$	55	$	—	$	57
Commercial	64		—		—		—		—		20		—		44
Industrial	24		—		—		—		—		3		—		22
Power Generation	—		—		—		—		—		—		—		10
Other revenues	16		—		—		—		—		3		—		11
Total Gas Utilities and Infrastructure revenue from contracts with customers	$	216	$	—	$	—	$	—	$	—	$	81	$	—	$	144
Commercial Renewables
Revenue from contracts with customers	$	57	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other
Revenue from contracts with customers	$	7	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Total revenue from contracts with customers	$	6,658	$	2,068	$	3,179	$	1,612	$	1,567	$	481	$	762	$	144
Other revenue sources(a)	$	63	$	(10)	$	18	$	14	$	—	$	(8)	$	(1)	$	18
Total revenues	$	6,721	$	2,058	$	3,197	$	1,626	$	1,567	$	473	$	761	$	162

(a)Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues.

	Nine Months Ended September 30, 2021
			Duke				Duke		Duke		Duke		Duke
(in millions)	Duke		Energy		Progress		Energy		Energy		Energy		Energy
By market or type of customer	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Electric Utilities and Infrastructure
Residential	$	7,753	$	2,368	$	3,903	$	1,657	$	2,246	$	589	$	894	$	—
General	4,805		1,685		2,170		1,036		1,134		329		619		—
Industrial	2,228		872		700		500		200		99		558		—
Wholesale	1,644		341		1,056		901		155		45		202		—
Other revenues	712		208		509		272		237		61		64		—
Total Electric Utilities and Infrastructure revenue from contracts with customers	$	17,142	$	5,474	$	8,338	$	4,366	$	3,972	$	1,123	$	2,337	$	—
Gas Utilities and Infrastructure
Residential	$	747	$	—	$	—	$	—	$	—	$	241	$	—	$	505
Commercial	373		—		—		—		—		99		—		273
Industrial	110		—		—		—		—		14		—		96
Power Generation	—		—		—		—		—		—		—		69
Other revenues	100		—		—		—		—		21		—		34
Total Gas Utilities and Infrastructure revenue from contracts with customers	$	1,330	$	—	$	—	$	—	$	—	$	375	$	—	$	977
Commercial Renewables
Revenue from contracts with customers	$	163	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other
Revenue from contracts with customers	$	20	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Total Revenue from contracts with customers	$	18,655	$	5,474	$	8,338	$	4,366	$	3,972	$	1,498	$	2,337	$	977
Other revenue sources(a)	$	204	$	(44)	$	79	$	51	$	15	$	(4)	$	29	$	39
Total revenues	$	18,859	$	5,430	$	8,417	$	4,417	$	3,987	$	1,494	$	2,366	$	1,016

(a)Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues.

	Nine Months Ended September 30, 2020
			Duke				Duke		Duke		Duke		Duke
(in millions)	Duke		Energy		Progress		Energy		Energy		Energy		Energy
By market or type of customer	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Electric Utilities and Infrastructure
Residential	$	7,451	$	2,316	$	3,792	$	1,578	$	2,214	$	558	$	785	$	—
General	4,691		1,720		2,080		1,001		1,079		336		554		—
Industrial	2,148		871		673		487		186		103		502		—
Wholesale	1,535		332		1,018		877		141		22		163		—
Other revenues	713		184		476		208		268		62		63		—
Total Electric Utilities and Infrastructure revenue from contracts with customers	$	16,538	$	5,423	$	8,039	$	4,151	$	3,888	$	1,081	$	2,067	$	—
Gas Utilities and Infrastructure
Residential	$	631	$	—	$	—	$	—	$	—	$	214	$	—	$	417
Commercial	308		—		—		—		—		86		—		222
Industrial	92		—		—		—		—		12		—		80
Power Generation	—		—		—		—		—		—		—		27
Other revenues	58		—		—		—		—		12		—		46
Total Gas Utilities and Infrastructure revenue from contracts with customers	$	1,089	$	—	$	—	$	—	$	—	$	324	$	—	$	792
Commercial Renewables
Revenue from contracts with customers	$	170	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other
Revenue from contracts with customers	$	20	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Total Revenue from contracts with customers	$	17,817	$	5,423	$	8,039	$	4,151	$	3,888	$	1,405	$	2,067	$	792
Other revenue sources(a)	$	274	$	(7)	$	78	$	56	$	9	$	(11)	$	3	$	79
Total revenues	$	18,091	$	5,416	$	8,117	$	4,207	$	3,897	$	1,394	$	2,070	$	871

(a)Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues.

Reserve for Credit Losses for Trade and Other Receivables

The following table presents the reserve for credit losses for trade and other receivables based on adoption of the new standard.

	Three Months Ended September 30, 2020 and 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Balance at June 30, 2020	$	102	$	14	$	29	$	14	$	14	$	5	$	3	$	6
Write-Offs	12		(2)		15		13		2		—		—		—
Credit Loss Expense	(9)		—		(16)		(15)		—		—		—		3
Other Adjustments	28		10		9		9		—		—		—		—
Balance at September 30, 2020	$	133	$	22	$	37	$	21	$	16	$	5	$	3	$	9
Balance at June 30, 2021	$	123	$	42	$	36	$	21	$	16	$	4	$	3	$	13
Write-Offs	(13)		(3)		(6)		(3)		(3)		—		—		(4)
Credit Loss Expense	11		4		6		3		3		—		—		2
Other Adjustments	2		(1)		—		—		—		—		—		4
Balance at September 30, 2021	$	123	$	42	$	36	$	21	$	16	$	4	$	3	$	15
	Nine Months Ended September 30, 2020 and 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Balance at December 31, 2019	$	76	$	10	$	16	$	8	$	7	$	4	$	3	$	6
Cumulative Change in Accounting Principle	5		1		2		1		1		—		—		1
Write-Offs	(7)		(8)		8		8		—		—		—		(5)
Credit Loss Expense	24		9		2		(5)		8		1		—		7
Other Adjustments	35		10		9		9		—		—		—		—
Balance at September 30, 2020	$	133	$	22	$	37	$	21	$	16	$	5	$	3	$	9
Balance at December 31, 2020	$	146	$	23	$	37	$	23	$	14	$	4	$	3	$	12
Write-Offs	(39)		(10)		(20)		(11)		(9)		—		—		(7)
Credit Loss Expense	40		20		19		9		10		—		—		6
Other Adjustments	(24)		9		—		—		1		—		—		4
Balance at September 30, 2021	$	123	$	42	$	36	$	21	$	16	$	4	$	3	$	15

Aging of Trade Receivables

The aging of trade receivables is presented in the table below. Duke Energy considers receivables greater than 30 days outstanding past due.

	September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Unbilled Revenue(a)(b)	$	826	$	308	$	242	$	125	$	117	$	5	$	27	$	7
0-30 days	2,201		689		910		521		388		65		41		80
30-60 days	194		74		63		37		26		7		5		6
60-90 days	57		30		14		6		8		1		1		3
90+ days	161		68		27		5		22		31		10		9
Deferred Payment Arrangements(c)	113		66		29		21		8		2		—		6
Trade and Other Receivables	$	3,552	$	1,235	$	1,285	$	715	$	569	$	111	$	84	$	111

	December 31, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Unbilled Revenue(a)(b)	$	969	$	328	$	283	$	167	$	116	$	2	$	16	$	86
0-30 days	1,789		445		707		398		307		60		26		149
30-60 days	185		80		54		25		29		8		3		8
60-90 days	22		1		10		4		6		2		1		3
90+ days	119		16		32		9		23		30		12		9
Deferred Payment Arrangements(c)	215		96		80		52		28		—		—		7
Trade and Other Receivables	$	3,299	$	966	$	1,166	$	655	$	509	$	102	$	58	$	262

(a)Unbilled revenues are recognized by applying customer billing rates to the estimated volumes of energy or natural gas delivered but not yet billed and are included within Receivables and Receivables of VIEs on the Condensed Consolidated Balance Sheets.

(b)Duke Energy Ohio and Duke Energy Indiana sell, on a revolving basis, nearly all of their retail accounts receivable, including receivables for unbilled revenues, to an affiliate, CRC, and account for the transfers of receivables as sales. Accordingly, the receivables sold are not reflected on the Condensed Consolidated Balance Sheets of Duke Energy Ohio and Duke Energy Indiana. See Note 11 for further information. These receivables for unbilled revenues are $64 million and $115 million for Duke Energy Ohio and Duke Energy Indiana, respectively, as of September 30, 2021, and $87 million and $134 million for Duke Energy Ohio and Duke Energy Indiana, respectively, as of December 31, 2020.

(c)Due to certain customer financial hardships created by the COVID-19 pandemic and resulting stay-at-home orders, Duke Energy permitted customers to defer payment of past-due amounts through an installment payment plan over a period of several months.

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Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Schedule Of Earnings Per Share

The following table presents Duke Energy’s basic and diluted EPS calculations, the weighted average number of common shares outstanding and common and preferred share dividends declared.

	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions, except per share amounts)	2021		2020		2021		2020
Net income available to Duke Energy common stockholders	$	1,366	$	1,265	$	3,070	$	1,347
Accumulated preferred stock dividends adjustment	12		12		12		13
Less: Impact of participating securities	1		1		3		2
Income from continuing operations available to Duke Energy common stockholders	$	1,377	$	1,276	$	3,079	$	1,358
Weighted average common shares outstanding – basic and diluted	769		735		769		735
EPS available to Duke Energy common stockholders
Basic and diluted	$	1.79	$	1.74	$	4.00	$	1.85
Potentially dilutive items excluded from the calculation(a)	2		2		2		2
Dividends declared per common share	$	0.985	$	0.965	$	2.915	$	2.855
Dividends declared on Series A preferred stock per depositary share(b)	$	0.359	$	0.359	$	1.078	$	1.078
Dividends declared on Series B preferred stock per share(c)	$	24.375	$	24.375	$	48.750	$	49.292

(a)Performance stock awards were not included in the dilutive securities calculation because the performance measures related to the awards had not been met.

(b)5.75% Series A Cumulative Redeemable Perpetual Preferred Stock dividends are payable quarterly in arrears on the 16th day of March, June, September and December. The preferred stock has a $25 liquidation preference per depositary share.

(c)4.875% Series B Fixed-Rate Reset Cumulative Redeemable Perpetual Preferred Stock dividends are payable semiannually in arrears on the 16th day of March and September. The preferred stock has a $1,000 liquidation preference per share.

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Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2021

Qualified Pension Plans

Defined Benefit Plan Disclosure [Line Items]

Components of Net Periodic Pension Costs

The following tables include the components of net periodic pension costs for qualified pension plans.

	Three Months Ended September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Service cost	$	43	$	14	$	13	$	7	$	5	$	2	$	2	$	1
Interest cost on projected benefit obligation	55		13		17		8		10		2		5		2
Expected return on plan assets	(139)		(36)		(47)		(21)		(25)		(7)		(10)		(5)
Amortization of actuarial loss	33		7		10		5		5		2		3		2
Amortization of prior service credit	(7)		(2)		(1)		—		(1)		—		—		(1)
Amortization of settlement charges	2		1		1		—		—		—		—		1
Net periodic pension costs	$	(13)	$	(3)	$	(7)	$	(1)	$	(6)	$	(1)	$	—	$	—

	Three Months Ended September 30, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Service cost	$	41	$	12	$	12	$	6	$	5	$	1	$	2	$	1
Interest cost on projected benefit obligation	67		16		21		10		12		4		6		2
Expected return on plan assets	(143)		(36)		(48)		(22)		(25)		(7)		(11)		(5)
Amortization of actuarial loss	32		7		10		4		6		2		3		2
Amortization of prior service credit	(8)		(2)		—		—		—		—		—		(2)
Amortization of settlement charges	11		6		5		5		1		—		1		1
Net periodic pension costs	$	—	$	3	$	—	$	3	$	(1)	$	—	$	1	$	(1)

	Nine Months Ended September 30, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Service cost	$	131	$	42	$	38	$	22	$	16	$	4	$	7	$	4
Interest cost on projected benefit obligation	165		38		52		23		29		9		14		6
Expected return on plan assets	(418)		(106)		(141)		(63)		(76)		(21)		(30)		(15)
Amortization of actuarial loss	100		22		29		14		15		5		10		7
Amortization of prior service credit	(22)		(6)		(2)		(1)		(1)		—		(1)		(6)
Amortization of settlement charges	6		4		2		1		—		—		—		1
Net periodic pension costs	$	(38)	$	(6)	$	(22)	$	(4)	$	(17)	$	(3)	$	—	$	(3)

	Nine Months Ended September 30, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Service cost	$	124	$	38	$	36	$	20	$	16	$	3	$	6	$	4
Interest cost on projected benefit obligation	202		47		64		29		35		12		17		7
Expected return on plan assets	(429)		(108)		(143)		(66)		(76)		(21)		(32)		(16)
Amortization of actuarial loss	96		21		30		13		17		5		9		7
Amortization of prior service credit	(24)		(6)		(2)		(1)		(1)		—		(1)		(7)
Amortization of settlement charges	16		8		6		6		1		—		1		1
Net periodic pension costs	$	(15)	$	—	$	(9)	$	1	$	(8)	$	(1)	$	—	$	(4)

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Income Taxes (Tables)

9 Months Ended

Sep. 30, 2021

Income Tax Disclosure [Abstract]

Summary of Effective Tax Rates

The ETRs from continuing operations for each of the Duke Energy Registrants are included in the following table.

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Duke Energy	6.6	%	7.8	%	6.7	%	(6.4)	%
Duke Energy Carolinas	2.9	%	12.0	%	3.6	%	13.6	%
Progress Energy	12.9	%	10.4	%	11.5	%	13.4	%
Duke Energy Progress	6.3	%	3.1	%	5.9	%	10.0	%
Duke Energy Florida	19.1	%	21.4	%	19.1	%	20.3	%
Duke Energy Ohio	13.4	%	16.7	%	15.3	%	16.6	%
Duke Energy Indiana	15.8	%	19.6	%	16.3	%	19.4	%
Piedmont	25.0	%	16.7	%	8.4	%	3.7	%

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Organization and Basis of Presentation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Noncontrolling Interest [Line Items]
Other current liabilities	$ 2,239	$ 2,239		$ 2,936
Charges related to reduction in physical workspace	9	184
Impairment of assets and other charges
Noncontrolling Interest [Line Items]
Charges related to reduction in physical workspace	8	139
Operation, maintenance and other
Noncontrolling Interest [Line Items]
Charges related to reduction in physical workspace	1	28
Depreciation and amortization
Noncontrolling Interest [Line Items]
Charges related to reduction in physical workspace		17
Forecast
Noncontrolling Interest [Line Items]
Charges related to reduction in physical workspace			$ 200
ACP
Noncontrolling Interest [Line Items]
Other current liabilities	$ 36	$ 36		$ 936

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Organization and Basis of Presentation (Schedule of Allocated Losses from Subsidiaries, Noncontrolling Interest) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Allocated losses to noncontrolling tax equity members utilizing the HLBV method	$ 119	$ 59	$ 217	$ 187
Allocated losses to noncontrolling members based on pro rata shares of ownership	10	11	30	21
Total Noncontrolling Interest Allocated Losses	$ 129	$ 70	$ 247	$ 208

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Organization and Basis of Presentation (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Current Assets
Cash and cash equivalents	$ 548	$ 259
Other	194	194
Other Noncurrent Assets
Other	1	103
Total cash, cash equivalents and restricted cash	743	556	$ 600	$ 573
Progress Energy
Current Assets
Cash and cash equivalents	102	59
Other	17	39
Other Noncurrent Assets
Other		102
Total cash, cash equivalents and restricted cash	119	200	188	126
Duke Energy Florida
Current Assets
Cash and cash equivalents	40	11
Other	17	39
Other Noncurrent Assets
Total cash, cash equivalents and restricted cash	$ 57	$ 50	$ 35	$ 56

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Organization and Basis of Presentation (Schedule of Inventory) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Public Utilities, Inventory [Line Items]
Inventory	$ 2,900	$ 3,167
Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	2,317	2,312
Coal
Public Utilities, Inventory [Line Items]
Inventory	312	561
Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	271	294
Duke Energy Carolinas
Public Utilities, Inventory [Line Items]
Inventory	969	1,010
Duke Energy Carolinas | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	779	785
Duke Energy Carolinas | Coal
Public Utilities, Inventory [Line Items]
Inventory	152	186
Duke Energy Carolinas | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	38	39
Progress Energy
Public Utilities, Inventory [Line Items]
Inventory	1,255	1,375
Progress Energy | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	1,009	999
Progress Energy | Coal
Public Utilities, Inventory [Line Items]
Inventory	89	193
Progress Energy | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	157	183
Duke Energy Progress
Public Utilities, Inventory [Line Items]
Inventory	815	911
Duke Energy Progress | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	674	673
Duke Energy Progress | Coal
Public Utilities, Inventory [Line Items]
Inventory	45	131
Duke Energy Progress | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	96	107
Duke Energy Florida
Public Utilities, Inventory [Line Items]
Inventory	439	464
Duke Energy Florida | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	336	325
Duke Energy Florida | Coal
Public Utilities, Inventory [Line Items]
Inventory	43	63
Duke Energy Florida | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	60	76
Duke Energy Ohio
Public Utilities, Inventory [Line Items]
Inventory	114	110
Duke Energy Ohio | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	85	78
Duke Energy Ohio | Coal
Public Utilities, Inventory [Line Items]
Inventory	10	16
Duke Energy Ohio | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	19	16
Duke Energy Indiana
Public Utilities, Inventory [Line Items]
Inventory	367	473
Duke Energy Indiana | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	305	307
Duke Energy Indiana | Coal
Public Utilities, Inventory [Line Items]
Inventory	61	165
Duke Energy Indiana | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	1	1
Piedmont
Public Utilities, Inventory [Line Items]
Inventory	68	68
Piedmont | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	11	12
Piedmont | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	$ 57	$ 56

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Organization and Basis of Presentation (Schedule of New Accounting Pronouncements) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	$ 47,951	$ 51,240	$ 49,545	$ 49,184	$ 47,295	$ 46,611
Accounting Standards Update [Extensible List]	ASU 2016-13
Progress Energy
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	$ 15,593	16,882	16,942	16,241	16,429	16,221
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	4,108	3,293	2,687	2,471	3,260	2,707
Retained Earnings | Progress Energy
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	6,465	$ 7,743	$ 7,809	$ 7,109	$ 7,296	$ 7,090
Cumulative Change in Accounting Principle | Retained Earnings | Revision of Prior Period, Accounting Standards Update, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	120
Cumulative Change in Accounting Principle | Retained Earnings | Revision of Prior Period, Accounting Standards Update, Adjustment | Duke Energy Carolinas
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	16
Cumulative Change in Accounting Principle | Retained Earnings | Revision of Prior Period, Accounting Standards Update, Adjustment | Progress Energy
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	2
Cumulative Change in Accounting Principle | Retained Earnings | Revision of Prior Period, Accounting Standards Update, Adjustment | Duke Energy Progress
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	1
Cumulative Change in Accounting Principle | Retained Earnings | Revision of Prior Period, Accounting Standards Update, Adjustment | Duke Energy Florida
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	1
Cumulative Change in Accounting Principle | Retained Earnings | Revision of Prior Period, Accounting Standards Update, Adjustment | Piedmont
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	$ 1

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Business Segments (Narrative) (Details) $ in Millions				3 Months Ended	9 Months Ended
		Sep. 08, 2021 USD ($)	Jan. 28, 2021 USD ($) closing	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($) segment
Segment Reporting Information [Line Items]
Sale of noncontrolling interest	[1]			$ 999	$ 999
Noncontrolling Interests
Segment Reporting Information [Line Items]
Sale of noncontrolling interest	[1]			454	$ 454
Duke Energy Indiana | Noncontrolling Interests
Segment Reporting Information [Line Items]
Percentage sold			19.90%
Number of closings | closing			2
Value of sale of parent interest		$ 1,025	$ 2,000
Ownership interest sold		11.05%
Proceed of purchase price for exchange in interest		50.00%
Transaction costs		$ 27
Sale of noncontrolling interest		$ 545
Duke Energy Ohio
Segment Reporting Information [Line Items]
Number of reportable segments | segment					2
Wind and solar | Nonregulated
Segment Reporting Information [Line Items]
Renewable merchant plants				$ 206	$ 206
Joint owner ownership percentage				50.00%	50.00%

[1] Relates to the sale of a noncontrolling interest in Duke Energy Indiana. See Note 2 for additional discussion.

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Business Segments (Business Segment Data) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Operating revenues	$ 6,951	$ 6,721	$ 18,859	$ 18,091
Segment income (loss)	1,366	1,265	3,070	1,347
Less: Noncontrolling interests	129	70	247	208
Add: Preferred stock dividend	39	39	92	93
Net Income	1,276	1,234	2,915	1,232
Segment assets	167,007		167,007		$ 162,388
Equity in earnings (losses) of unconsolidated affiliates	22	(80)	14	(2,004)
Impairment of assets and other charges	211	28	342	36
Income (loss) before taxes	1,366	1,339	3,125	1,158
Nonregulated electric and other	193	192	573	574
Incurred costs	1,507	1,450	4,319	4,142
Duke Energy Carolinas
Segment Reporting Information [Line Items]
Operating revenues	2,104	2,058	5,430	5,416
Segment assets	46,221		46,221		45,048
Impairment of assets and other charges	163	20	238	22
Income (loss) before taxes	549	631	1,110	1,306
Incurred costs	471	402	1,347	1,218
Duke Energy Progress
Segment Reporting Information [Line Items]
Operating revenues	1,667	1,626	4,417	4,207
Segment assets	34,557		34,557		33,733
Impairment of assets and other charges	42	5	60	5
Income (loss) before taxes	400	357	850	790
Incurred costs	368	348	1,092	970
Piedmont
Segment Reporting Information [Line Items]
Operating revenues	195	162	1,016	871
Segment assets	9,024		9,024		8,615
Equity in earnings (losses) of unconsolidated affiliates			7	7
Impairment of assets and other charges	4	7	9	7
Income (loss) before taxes	(32)	(30)	191	161
Incurred costs	77	75	231	234
Duke Energy Ohio
Segment Reporting Information [Line Items]
Operating revenues	506	473	1,494	1,394
Segment income (loss)	58	70	188	201
Segment assets	10,505		10,505		$ 10,025
Impairment of assets and other charges			5
Income (loss) before taxes	67	84	222	241
Incurred costs	116	115	335	333
Impairment charges
Segment Reporting Information [Line Items]
Impairment of assets and other charges			139
Operations, maintenance and other
Segment Reporting Information [Line Items]
Impairment of assets and other charges			28
Depreciation and amortization
Segment Reporting Information [Line Items]
Impairment of assets and other charges			17
Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	6,560	6,371	17,161	16,571
Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	266	217	1,323	1,122
Gas Utilities and Infrastructure | Asset Impairment for Regulatory Action
Segment Reporting Information [Line Items]
Equity in earnings (losses) of unconsolidated affiliates			(19)
Commercial Renewables
Segment Reporting Information [Line Items]
Operating revenues	117	126	355	378
Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	6,943	6,714	18,839	18,071
Other
Segment Reporting Information [Line Items]
Operating revenues	8	7	20	20
Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	6,569	6,379	17,185	16,596
Segment income (loss)	1,425	1,381	3,180	2,839
Segment assets	141,565		141,565
Operating Segments | Electric Utilities and Infrastructure | Duke Energy Ohio
Segment Reporting Information [Line Items]
Operating revenues	413	394	1,119	1,070
Segment income (loss)	48	63	122	137
Segment assets	6,716		6,716
Operating Segments | Electric Utilities and Infrastructure | Impairment charges | Duke Energy Carolinas
Segment Reporting Information [Line Items]
Impairment of assets and other charges	160	19	160	19
Operating Segments | Electric Utilities and Infrastructure | Impairment charges | Duke Energy Progress
Segment Reporting Information [Line Items]
Impairment of assets and other charges	42		42
Operating Segments | Electric Utilities and Infrastructure | Impairment charges | Duke Energy Progress | ACP
Segment Reporting Information [Line Items]
Impairment of assets and other charges		5		5
Operating Segments | Electric Utilities and Infrastructure | Operations, maintenance and other | Duke Energy Carolinas
Segment Reporting Information [Line Items]
Income (loss) before taxes	5	8	5	8
Operating Segments | Electric Utilities and Infrastructure | Operations, maintenance and other | Duke Energy Progress
Segment Reporting Information [Line Items]
Income (loss) before taxes	7		7
Operating Segments | Electric Utilities and Infrastructure | Other income and expense | Duke Energy Carolinas
Segment Reporting Information [Line Items]
Income (loss) before taxes	77		77
Operating Segments | Electric Utilities and Infrastructure | Other income and expense | Duke Energy Progress
Segment Reporting Information [Line Items]
Income (loss) before taxes	34		34
Operating Segments | Electric Utilities and Infrastructure | Regulated electric operating revenues | Duke Energy Carolinas
Segment Reporting Information [Line Items]
Income (loss) before taxes	13		13
Operating Segments | Electric Utilities and Infrastructure | Regulated electric operating revenues | Duke Energy Progress
Segment Reporting Information [Line Items]
Income (loss) before taxes	15		15
Operating Segments | Electric Utilities and Infrastructure | Interest expense | Duke Energy Carolinas
Segment Reporting Information [Line Items]
Income (loss) before taxes	3		3
Operating Segments | Electric Utilities and Infrastructure | Interest expense | Duke Energy Progress
Segment Reporting Information [Line Items]
Income (loss) before taxes	5		5
Operating Segments | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	289	241	1,391	1,194
Segment income (loss)	(3)	(73)	259	(1,400)
Segment assets	14,692		14,692
Equity in earnings (losses) of unconsolidated affiliates	3	78		2,000
Operating Segments | Gas Utilities and Infrastructure | Duke Energy Ohio
Segment Reporting Information [Line Items]
Operating revenues	93	79	375	324
Segment income (loss)	11	9	77	68
Segment assets	3,783		3,783
Operating Segments | Gas Utilities and Infrastructure | Impairment charges
Segment Reporting Information [Line Items]
Impairment of assets and other charges	8
Operating Segments | Gas Utilities and Infrastructure | Impairment charges | Piedmont
Segment Reporting Information [Line Items]
Impairment of assets and other charges		7
Operating Segments | Gas Utilities and Infrastructure | Operations, maintenance and other
Segment Reporting Information [Line Items]
Income (loss) before taxes	1
Operating Segments | Commercial Renewables
Segment Reporting Information [Line Items]
Operating revenues	117	126	355	378
Segment income (loss)	78	60	152	207
Segment assets	7,037		7,037
Operating Segments | Commercial Renewables | Texas Storm Uri
Segment Reporting Information [Line Items]
Less: Noncontrolling interests			12
Equity in earnings (losses) of unconsolidated affiliates			29
Income (loss) before taxes			(35)
Nonregulated electric and other			8
Incurred costs			2
Operating Segments | Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	6,975	6,746	18,931	18,168
Segment income (loss)	1,500	1,368	3,591	1,646
Segment assets	163,294		163,294
Operating Segments | Total Reportable Segments | Duke Energy Ohio
Segment Reporting Information [Line Items]
Operating revenues	506	473	1,494	1,394
Segment income (loss)	59	72	199	205
Segment assets	10,499		10,499
Other | Operations, maintenance and other
Segment Reporting Information [Line Items]
Income (loss) before taxes				98
Other | Other
Segment Reporting Information [Line Items]
Operating revenues	28	24	81	73
Segment income (loss)	(134)	(103)	(521)	(299)
Segment assets	3,717		3,717
Other | Other | Duke Energy Ohio
Segment Reporting Information [Line Items]
Segment income (loss)	(1)	(2)	(11)	(4)
Segment assets	27		27
Eliminations
Segment Reporting Information [Line Items]
Operating revenues	(52)	(49)	(153)	(150)
Segment assets	(4)		(4)
Eliminations | Duke Energy Ohio
Segment Reporting Information [Line Items]
Segment assets	(21)		(21)
Eliminations | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	9	8	24	25
Eliminations | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	23	24	68	72
Eliminations | Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	32	32	92	97
Eliminations | Other
Segment Reporting Information [Line Items]
Operating revenues	$ 20	$ 17	$ 61	$ 53

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Regulatory Matters (Duke Energy Carolinas and Duke Energy Progress) (Details) - USD ($) $ in Millions			3 Months Ended			9 Months Ended
	Jan. 27, 2021	Jan. 22, 2021	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges			$ 211		$ 28	$ 342	$ 36
Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges			163		20	238	22
Duke Energy Carolinas | 20-year storm recovery bond
Public Utilities, General Disclosures [Line Items]
Facility term	20 years
Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges			$ 42		$ 5	$ 60	$ 5
Duke Energy Progress | 20-year storm recovery bond
Public Utilities, General Disclosures [Line Items]
Facility term	20 years
CCR Settlement Agreement | Duke Energy Carolinas and Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Recovery costs not sought		$ 1,000
Recovery costs amortization period		5 years
Equity return on deferred coal ash cost future cases		1.50%
CCR Settlement Agreement | Duke Energy Carolinas and Duke Energy Progress | NCUC
Public Utilities, General Disclosures [Line Items]
Public utilities, requested equity capital structure, percentage		48.00%
Public utilities, requested debt capital structure, percentage		52.00%
CCR Settlement Agreement | Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges				$ 454
Reversal of regulated electric operating revenues				50
CCR Settlement Agreement | Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges				494
Reversal of regulated electric operating revenues				$ 102
2020 North Carolina Storm Securitization Filings | Duke Energy Carolinas | NCUC | Storm costs
Public Utilities, General Disclosures [Line Items]
Regulatory assets	$ 287
2020 North Carolina Storm Securitization Filings | Duke Energy Progress | NCUC | Storm costs
Public Utilities, General Disclosures [Line Items]
Regulatory assets	$ 920

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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Carolinas) (Details) $ in Millions												3 Months Ended		9 Months Ended
	Sep. 27, 2021 contention	Jul. 28, 2021	Jun. 07, 2021	Jun. 06, 2021	May 21, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2019 USD ($)	May 21, 2019 USD ($)	Nov. 08, 2018 USD ($)	Feb. 28, 2018	Aug. 25, 2017 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges												$ 211	$ 28	$ 342	$ 36
Other income and expenses, net												238	127	$ 493	310
Nuclear Regulatory Commission
Public Utilities, General Disclosures [Line Items]
Operating license extension														20 years
Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges												163	$ 20	$ 238	$ 22
Duke Energy Carolinas | NCUC | 2017 North Carolina Rate Case
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount											$ 647
Requested return on equity, percent										9.90%
Public utilities, requested equity capital structure, percentage										52.00%
Public utilities, requested debt capital structure, percentage										48.00%
Duke Energy Carolinas | NCUC | 2019 North Carolina Rate Case
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount							$ 291
Requested rate increase, percentage							6.00%
Requested rate increase (decrease), gross amount							$ 445
Requested rate increase (decrease), rider reduction							$ 154
Duke Energy Carolinas | NCUC | 2019 North Carolina Rate Case, additional Agreement and Stipulation of Partial Settlement
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage						9.60%
Public utilities, approved equity capital structure, percentage						52.00%
Public utilities, approved debt capital structure, percentage						48.00%
Approved rate increase, amount					$ 33
Duke Energy Carolinas | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount									$ 168
Approved return on equity percentage								9.50%
Public utilities, approved equity capital structure, percentage								53.00%
Public utilities, approved debt capital structure, percentage								47.00%
Change in tax rate, deferred tax liability, income tax benefit								$ 66
Measurement period adjustment, income tax expense (benefit)								$ 45
Duke Energy Carolinas | PSCSC | South Carolina Rate Case 2018 | North Carolina Department of Revenue | State and local jurisdiction
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period								5 years
State and local taxes reduction amount								$ 17
Duke Energy Carolinas | Nuclear Regulatory Commission | Oconee Nuclear Station Subsequent License Renewal
Public Utilities, General Disclosures [Line Items]
Comment period		60 days
Number of contentions | contention	3
Duke Energy Carolinas | Nuclear Regulatory Commission | Oconee Nuclear Station Subsequent License Renewal | Oconee Nuclear Station
Public Utilities, General Disclosures [Line Items]
Operating license extension			20 years
Operating license			80 years	60 years
Duke Energy Carolinas | Grid Improvement | NCUC | 2019 North Carolina Rate Case, additional Agreement and Stipulation of Partial Settlement
Public Utilities, General Disclosures [Line Items]
Regulatory assets						$ 800
Duke Energy Carolinas | Storm costs | NCUC | 2019 North Carolina Rate Case, additional Agreement and Stipulation of Partial Settlement
Public Utilities, General Disclosures [Line Items]
Regulatory assets						$ 213
Duke Energy Carolinas | Deferred project costs | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory assets								$ 125
Regulatory asset, amortization period								12 years
Duke Energy Carolinas | Asset retirement obligations - coal ash | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory assets								$ 96
Regulatory asset, amortization period								5 years
Recovery costs denied								$ 115
Impairment of assets and other charges												160		160
Other income and expenses, net												$ 31		$ 31
Duke Energy Carolinas | Asset retirement obligations - unprotected EDIT, Property, Plant and Equipment | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period								20 years
Duke Energy Carolinas | Asset retirement obligations - unprotected EDIT | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period								5 years
Duke Energy Carolinas | Asset retirement obligations - deferred revenue | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period								5 years

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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Progress) (Details) $ in Millions										3 Months Ended		9 Months Ended
	May 21, 2021 USD ($)	Apr. 16, 2021 USD ($)	Oct. 16, 2020	Oct. 30, 2019 USD ($)	Oct. 11, 2019	May 21, 2019 USD ($)	Nov. 08, 2018 USD ($)	Nov. 22, 2017	Jun. 01, 2017 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jul. 27, 2020 MW
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges										$ 211	$ 28	$ 342	$ 36
Other income and expenses, net										238	127	493	310
Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges										42	$ 5	60	$ 5
Duke Energy Progress | Western Carolinas Modernization Plan
Public Utilities, General Disclosures [Line Items]
Generation capacity (MW) | MW														5
Duke Energy Progress | NCUC | 2017 North Carolina Rate Case
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount									$ 477
Requested rate increase (decrease), amended amount									$ 420
Requested return on equity, percent								9.90%
Public utilities, requested equity capital structure, percentage								52.00%
Public utilities, requested debt capital structure, percentage								48.00%
Duke Energy Progress | NCUC | 2019 North Carolina Rate Case
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount				$ 464
Requested rate increase, percentage				12.30%
Requested rate increase (decrease), gross amount				$ 586
Rider reduction				122
Requested rate increase (decrease), rider reduction				$ 120
Approved rate increase, amount	$ 178
Duke Energy Progress | NCUC | 2019 North Carolina Rate Case, additional Agreement and Stipulation of Partial Settlement
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage		9.60%
Public utilities, approved equity capital structure, percentage		52.00%
Public utilities, approved debt capital structure, percentage		48.00%
Duke Energy Progress | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount							$ 59
Approved return on equity percentage						9.50%
Public utilities, approved equity capital structure, percentage						53.00%
Public utilities, approved debt capital structure, percentage						47.00%
Change in tax rate, deferred tax liability, income tax benefit						$ 17
Measurement period adjustment, income tax expense (benefit)						12
Duke Energy Progress | FERC | FERC Return on Equity Complaint, NCEMPA
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage					11.00%
Duke Energy Progress | FERC | FERC Return on Equity Complaint, NCEMC
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage			11.00%
Duke Energy Progress | State and local jurisdiction | North Carolina Department of Revenue | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
State and local taxes increase amount						12
Duke Energy Progress | Grid Improvement | NCUC | 2019 North Carolina Rate Case, additional Agreement and Stipulation of Partial Settlement
Public Utilities, General Disclosures [Line Items]
Regulatory assets		$ 400
Duke Energy Progress | Storm costs | NCUC | 2019 North Carolina Rate Case, additional Agreement and Stipulation of Partial Settlement
Public Utilities, General Disclosures [Line Items]
Regulatory assets		$ 714
Duke Energy Progress | Asset retirement obligations - coal ash | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory assets						$ 4
Regulatory asset, amortization period						5 years
Recovery costs denied						$ 65
Impairment of assets and other charges										42		42
Other income and expenses, net										$ 6		$ 6
Duke Energy Progress | Asset retirement obligations - unprotected EDIT, Property, Plant and Equipment | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period						20 years
Duke Energy Progress | Asset retirement obligations - unprotected EDIT | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period						5 years
Duke Energy Progress | Asset retirement obligations - deferred revenue | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period						3 years

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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Florida) (Details) - Duke Energy Florida			12 Months Ended
	May 04, 2021 USD ($)	Jul. 01, 2020 USD ($) plant MW	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	May 19, 2020 USD ($)	Dec. 19, 2019 USD ($)	Nov. 22, 2019 USD ($)	Apr. 30, 2019 USD ($)
FPSC
Public Utilities, General Disclosures [Line Items]
Number of solar plants | plant		10
Generation capacity (MW) | MW		750
2021 Settlement | FPSC
Public Utilities, General Disclosures [Line Items]
Public utilities, approved equity capital structure, percentage	53.00%
Public utilities, approved debt capital structure, percentage	47.00%
Public utilities, basis points, increase, percentage	0.25%
Contract with customer, asset, after allowance for credit loss, noncurrent	$ 173,000,000
Future investment in infrastructure	$ 1,000,000,000
2021 Settlement | FPSC | US Treasury Securities
Public Utilities, General Disclosures [Line Items]
Public utilities, basis points, increase, percentage	0.50%
2021 Settlement | FPSC | Minimum
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage	8.85%
2021 Settlement | FPSC | Minimum | US Treasury Securities
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage	9.85%
2021 Settlement | FPSC | Maximum
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage	10.85%
2021 Settlement | FPSC | Maximum | US Treasury Securities
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage	10.10%
2021 Settlement | FPSC | Weighted Average
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage	9.85%
2021 Settlement | FPSC | Subsequent event
Public Utilities, General Disclosures [Line Items]
Approved rate increase, amount			$ 79,000,000	$ 49,000,000	$ 67,000,000
Hurricane Michael storm damage
Public Utilities, General Disclosures [Line Items]
Estimated storm costs - capital and operation maintenance						$ 80,000,000
Hurricane Michael storm damage | FPSC
Public Utilities, General Disclosures [Line Items]
Estimated storm costs - capital and operation maintenance											$ 223,000,000
Amount of recovery costs sought								$ 188,000,000		$ 191,000,000
Requested supplemental true-up								$ 3,000,000
Hurricane Dorian storm damage | FPSC
Public Utilities, General Disclosures [Line Items]
Estimated storm costs - capital and operation maintenance									$ 169,000,000
Actual storm costs - capital and operation maintenance							$ 145,000,000
Solar Project
Public Utilities, General Disclosures [Line Items]
Estimated cost of facilities		$ 1,000,000,000
Estimated cost of facilities period		4 years

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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Ohio) (Details) $ in Millions				9 Months Ended
	Oct. 08, 2021 USD ($)	Oct. 01, 2021 USD ($)	Jun. 01, 2021 USD ($)	Sep. 30, 2021 USD ($) site	Dec. 31, 2020 USD ($)	Nov. 18, 2020 USD ($) order	Jul. 23, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jan. 01, 2020 plant	Nov. 21, 2019 condition	Jul. 12, 2019 USD ($)	Mar. 29, 2019 USD ($)	Sep. 28, 2018 USD ($)
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net				$ 110,236	$ 106,782
Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Number of nuclear generating facilities eligible for funding | plant									2
Public utilities, property, plant and equipment, net				8,429	8,009
Duke Energy Ohio | Duke Energy Ohio Electric Base Rate Case | PUCO | Subsequent event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		$ 55
Requested return on equity, percent		10.30%
Requested rate increase, percentage		3.30%
Duke Energy Ohio | Energy Efficiency Cost Recovery
Public Utilities, General Disclosures [Line Items]
Number of orders issued on application for rehearing | order						2
Shared savings cap						$ 8
Duke Energy Ohio | Natural Gas Pipeline extension | OPSB | Minimum
Public Utilities, General Disclosures [Line Items]
Estimated capital cost excluding AFUDC				185
Number of conditions on construction | condition										41
Duke Energy Ohio | Natural Gas Pipeline extension | OPSB | Maximum
Public Utilities, General Disclosures [Line Items]
Estimated capital cost excluding AFUDC				$ 205
Duke Energy Ohio | MGP Cost Recovery - 2009 Through 2012 | PUCO
Public Utilities, General Disclosures [Line Items]
Number of environmental remediation sites | site				2
Regulatory assets				$ 55
Duke Energy Ohio | MGP Cost Recovery - 2013 Through 2017 | PUCO
Public Utilities, General Disclosures [Line Items]
Regulatory assets													$ 26
Duke Energy Ohio | MGP Cost Recovery - 2013 Through 2017 | PUCO | MGP Costs - regulatory disallowance
Public Utilities, General Disclosures [Line Items]
Regulatory assets													$ 12
Duke Energy Ohio | MGP Cost Recovery - 2018 | PUCO
Public Utilities, General Disclosures [Line Items]
Regulatory assets												$ 20
Duke Energy Ohio | MGP Cost Recovery - 2018 | PUCO | MGP Costs - regulatory disallowance
Public Utilities, General Disclosures [Line Items]
Regulatory assets											$ 11
Duke Energy Ohio | MGP Cost Recovery - 2019 | PUCO
Public Utilities, General Disclosures [Line Items]
Regulatory assets								$ 39
Duke Energy Ohio | MGP Cost Recovery - 2019 | PUCO | MGP Costs - regulatory disallowance
Public Utilities, General Disclosures [Line Items]
Regulatory assets							$ 4
Duke Energy Ohio | Midwest Propane Caverns
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net				$ 27	$ 27
Duke Energy Kentucky | Duke Energy Kentucky Gas Base Rate Case | KPSC
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 15
Requested rate increase, percentage			13.00%
Duke Energy Kentucky | Duke Energy Kentucky Gas Base Rate Case | KPSC | Subsequent event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 9
Annual rate increase cap, percentage	5.00%
Base rate case-stay out period	4 years
Duke Energy Kentucky | Duke Energy Kentucky Gas Base Rate Case | KPSC | Subsequent event | Public Utilities, Natural Gas Base Rates
Public Utilities, General Disclosures [Line Items]
Requested rate increase, percentage	9.375%
Duke Energy Kentucky | Duke Energy Kentucky Gas Base Rate Case | KPSC | Subsequent event | Public Utilities, Natural Gas Riders
Public Utilities, General Disclosures [Line Items]
Requested rate increase, percentage	9.30%

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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Indiana) (Details) - Duke Energy Indiana - IURC - Indiana rate case 2019 - USD ($) $ in Millions	Jul. 28, 2021	Jun. 29, 2020	Dec. 04, 2019	Jul. 02, 2019	Dec. 31, 2020
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount				$ 395
Requested rate increase, percentage, net of tax			15.60%
Requested rate increase (decrease), amended amount			$ 396
Approved rate increase, amount		$ 146
Rate base					$ 10,200
Reduction of requested rate increase		$ 200
Reduction due to depreciation methodology		50.00%
Reduction due to approved return on equity		20.00%
Requested return on equity, percent		10.40%
Reduction due to earnings adjustments		20.00%
Estimated percentage of total rate increase, step one		75.00%
Estimated percentage of total rate increase, step two	25.00%
Approved return on equity percentage	9.70%	9.70%
Public utilities, approved equity capital structure, percentage	54.00%

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Regulatory Matters (Regulatory Matters Narrative - Piedmont) (Details) - Piedmont - USD ($) $ in Millions						1 Months Ended
	Sep. 07, 2021	Jul. 28, 2021	May 06, 2021	Mar. 22, 2021	Jul. 02, 2020	Dec. 31, 2020
2020 Tennessee Rate Case | TPUC
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount					$ 30	$ 26
Increase in annual revenue, percent					15.00%
Approved rate increase, amount			$ 16
Approved return on equity percentage			9.80%
2021 North Carolina Rate Case | NCUC
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 67			$ 109
Increase in annual revenue, percent				10.00%
Plants rolled into base rate				70.00%
Requested rate increase (decrease), amended amount		$ 97
Requested return on equity, percent	9.60%
Public utilities, requested equity capital structure, percentage	51.60%
Public utilities, requested debt capital structure, percentage	48.40%

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Regulatory Matters (Other Regulatory Matters) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Feb. 28, 2021	Dec. 31, 2020
Public Utilities, General Disclosures [Line Items]
Equity in (earnings) losses of unconsolidated affiliates		$ (22)	$ 80	$ (14)	$ 2,004
Other current liabilities		2,239		2,239			$ 2,936
Asset retirement obligations		673		673			718
ACP
Public Utilities, General Disclosures [Line Items]
Other current liabilities		36		36			$ 936
ACP | ACP
Public Utilities, General Disclosures [Line Items]
Equity in (earnings) losses of unconsolidated affiliates	$ 2,100
Other current liabilities		36		36
Other noncurrent liabilities		63		63
ACP | ACP | Current liabilities
Public Utilities, General Disclosures [Line Items]
Guarantor obligations settled						$ 855
Asset retirement obligations		$ 99		$ 99
ACP
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage		47.00%		47.00%

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Regulatory Matters (Schedule of Net Carrying Value Of Facilities and Megawatt Capacity) (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) MW	Dec. 31, 2034 asset	Dec. 31, 2020 USD ($) MW
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net	$ 110,236		$ 106,782
Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net	33,920		33,187
Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net	23,328		22,987
Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net	17,461		16,563
Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net	$ 11,770		$ 11,721
Generation facilities to be retired
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	8,707
Public utilities, property, plant and equipment, net	$ 6,038
Generation facilities to be retired | Duke Energy Carolinas | Allen Steam Station Units 1-2
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	324
Public utilities, property, plant and equipment, net	$ 19
Generation facilities to be retired | Duke Energy Carolinas | Allen Steam Station Units 4-5
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	516
Public utilities, property, plant and equipment, net	$ 362
Generation facilities to be retired | Duke Energy Carolinas | Cliffside Unit 5
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	544
Public utilities, property, plant and equipment, net	$ 367
Generation facilities to be retired | Duke Energy Carolinas | Allen Steam Station 3
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW			270
Public utilities, property, plant and equipment, net			$ 26
Generation facilities to be retired | Duke Energy Progress | Mayo Unit 1
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	704
Public utilities, property, plant and equipment, net	$ 640
Generation facilities to be retired | Duke Energy Progress | Roxboro Units 3-4
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	1,392
Public utilities, property, plant and equipment, net	$ 465
Generation facilities to be retired | Duke Energy Florida | Crystal River Units 4-5
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	1,410
Public utilities, property, plant and equipment, net	$ 1,658
Generation facilities to be retired | Duke Energy Florida | Crystal River Units 4 and 5 | Forecast
Public Utilities, General Disclosures [Line Items]
Facilities retiring ahead of schedule | asset		2
Facilities retiring ahead of schedule, years ahead		8 years
Generation facilities to be retired | Duke Energy Indiana | Gibson Units 1-5
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	2,822
Public utilities, property, plant and equipment, net	$ 1,814
Generation facilities to be retired | Duke Energy Indiana | Cayuga Units 1-2
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	995
Public utilities, property, plant and equipment, net	$ 713
Generation facilities to be retired | Duke Energy Indiana | Gallagher Units 2 and 4
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW			280
Public utilities, property, plant and equipment, net			$ 102

XML

Commitments and Contingencies (Schedule of Environmental Loss Contingencies) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	$ 74	$ 75
Duke Energy Carolinas
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	19	19
Progress Energy
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	17	19
Duke Energy Progress
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	6	6
Duke Energy Florida
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	11	12
Duke Energy Ohio
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	21	22
Duke Energy Indiana
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	5	6
Piedmont
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	$ 12	$ 10

XML

Commitments and Contingencies (Narrative) (Details) $ in Millions		9 Months Ended	56 Months Ended
	Jun. 16, 2021 people	Sep. 30, 2021 USD ($) claim case plant	Oct. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Texas Storm Uri Tort Litigation
Loss Contingencies [Line Items]
Number of state court actions filed | case		30
Coal Ash Insurance Coverage Litigation
Loss Contingencies [Line Items]
Number of NC and SC Plants with Ash Basins | plant		15
Duke Energy Carolinas and Duke Energy Progress | Coal Ash Insurance Coverage Litigation | Subsequent event
Loss Contingencies [Line Items]
Proceeds from legal settlements			$ 418
Duke Energy Carolinas | Ruben Villano, et al. v. Duke Energy Carolinas, LLC | Pending Litigation
Loss Contingencies [Line Items]
Number of individuals | people	9
Number of survivors | people	4
Number of deceased individuals | people	5
Duke Energy Carolinas | Asbestos-related Injuries and Damages Claims
Loss Contingencies [Line Items]
Asbestos-related injuries and damages reserves		$ 508		$ 572
Reinsurance retention policy, excess retention, amount reinsured		697
Probable insurance recoveries		$ 644		704
Duke Energy Carolinas | Asbestos-related Injuries and Damages Claims | Non-malignant cases
Loss Contingencies [Line Items]
Loss contingency, pending claims, number | claim		74
Asbestos-related injuries and damages reserves		$ 15
Duke Energy Carolinas | Asbestos-related Injuries and Damages Claims | Malignant cases
Loss Contingencies [Line Items]
Loss contingency, pending claims, number | claim		58
Asbestos-related injuries and damages reserves		$ 21
Duke Energy and Duke Energy Carolinas | ASU 2016-13
Loss Contingencies [Line Items]
Reserve for credit losses for insurance receivables		$ 15		$ 15

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Commitments and Contingencies (Narrative 2) (Details) - Spent Nuclear Fuel Matters $ in Millions	Jun. 18, 2018 USD ($)
Duke Energy Progress
Gain Contingencies [Line Items]
Gain contingency, unrecorded amount	$ 100
Duke Energy Florida
Gain Contingencies [Line Items]
Gain contingency, unrecorded amount	$ 200

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Debt and Credit Facilities (Summary of Debt Issuances) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Debt issuances	$ 5,950,000,000
Repayments of long-term debt	3,696,000,000	$ 3,468,000,000
Duke Energy (Parent)
Debt Instrument [Line Items]
Debt issuances	3,500,000,000
Repayments of long-term debt	1,750,000,000
Duke Energy Carolinas
Debt Instrument [Line Items]
Debt issuances	1,000,000,000
Repayments of long-term debt	616,000,000	457,000,000
Duke Energy Progress
Debt Instrument [Line Items]
Debt issuances	1,100,000,000
Repayments of long-term debt	605,000,000	$ 985,000,000
Piedmont
Debt Instrument [Line Items]
Debt issuances	350,000,000
Repayments of long-term debt	160,000,000
Unsecured Debt
Debt Instrument [Line Items]
Repayments of long-term debt	$ 160,000,000
Unsecured Debt | March 2021 Notes Due March 2031
Debt Instrument [Line Items]
Interest Rate	2.50%
Debt issuances	$ 350,000,000
Unsecured Debt | June 2021 Notes Due June 2023
Debt Instrument [Line Items]
Interest Rate	2.50%
Debt issuances	$ 500,000,000
Unsecured Debt | June 2021 Notes Due June 2031
Debt Instrument [Line Items]
Interest Rate	2.55%
Debt issuances	$ 1,000,000,000
Unsecured Debt | June 2021 Notes Due June 2041
Debt Instrument [Line Items]
Interest Rate	3.30%
Debt issuances	$ 750,000,000
Unsecured Debt | June 2021 Notes Due June 2051
Debt Instrument [Line Items]
Interest Rate	3.50%
Debt issuances	$ 750,000,000
Unsecured Debt | September 2021 Notes Due September 2081
Debt Instrument [Line Items]
Interest Rate	3.25%
Debt issuances	$ 500,000,000
Repayments of long-term debt	$ 500,000,000
Interest rate reset period	5 years
Unsecured Debt | Duke Energy (Parent) | June 2021 Notes Due June 2023
Debt Instrument [Line Items]
Debt issuances	$ 500,000,000
Unsecured Debt | Duke Energy (Parent) | June 2021 Notes Due June 2031
Debt Instrument [Line Items]
Debt issuances	1,000,000,000
Unsecured Debt | Duke Energy (Parent) | June 2021 Notes Due June 2041
Debt Instrument [Line Items]
Debt issuances	750,000,000
Unsecured Debt | Duke Energy (Parent) | June 2021 Notes Due June 2051
Debt Instrument [Line Items]
Debt issuances	750,000,000
Unsecured Debt | Duke Energy (Parent) | September 2021 Notes Due September 2081
Debt Instrument [Line Items]
Debt issuances	500,000,000
Unsecured Debt | Piedmont | March 2021 Notes Due March 2031
Debt Instrument [Line Items]
Debt issuances	$ 350,000,000
First Mortgage Bonds | April 2021 Notes Due April 2031
Debt Instrument [Line Items]
Interest Rate	2.55%
Debt issuances	$ 550,000,000
First Mortgage Bonds | April 2021 Notes Due April 2051
Debt Instrument [Line Items]
Interest Rate	3.45%
Debt issuances	$ 450,000,000
First Mortgage Bonds | August 2021 Notes Due August 2031
Debt Instrument [Line Items]
Interest Rate	2.00%
Debt issuances	$ 650,000,000
First Mortgage Bonds | August 2021 Notes Due August 2051
Debt Instrument [Line Items]
Interest Rate	2.90%
Debt issuances	$ 450,000,000
First Mortgage Bonds | Duke Energy Carolinas | April 2021 Notes Due April 2031
Debt Instrument [Line Items]
Debt issuances	550,000,000
First Mortgage Bonds | Duke Energy Carolinas | April 2021 Notes Due April 2051
Debt Instrument [Line Items]
Debt issuances	450,000,000
First Mortgage Bonds | Duke Energy Carolinas | Bonds maturing June 2021, 3.900% interest rate
Debt Instrument [Line Items]
Repayments of long-term debt	500,000,000
First Mortgage Bonds | Duke Energy Progress
Debt Instrument [Line Items]
Repayments of long-term debt	600,000,000
First Mortgage Bonds | Duke Energy Progress | August 2021 Notes Due August 2031
Debt Instrument [Line Items]
Debt issuances	650,000,000
First Mortgage Bonds | Duke Energy Progress | August 2021 Notes Due August 2051
Debt Instrument [Line Items]
Debt issuances	$ 450,000,000

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Debt and Credit Facilities (Summary of Current Maturities of Long-term Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 4,873	$ 4,238
Other debt securities
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 520
Duke Energy (Parent) | Debt Maturing October 2021, 5.125% interest rate | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	5.125%
Current maturities of long-term debt	$ 500
Duke Energy (Parent) | Debt Maturing March 2022, 3.227% interest rate | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	3.227%
Current maturities of long-term debt	$ 300
Duke Energy (Parent) | Debt Maturing March 2022, 0.775%, floating interest rate | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	0.764%
Current maturities of long-term debt	$ 300
Duke Energy (Parent) | Debt Maturing August 2022, 3.050% interest rate | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	3.05%
Current maturities of long-term debt	$ 500
Duke Energy (Parent) | Debt Maturing August 2022, 2.400% interest rate | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	2.40%
Current maturities of long-term debt	$ 500
Duke Energy Florida
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 276	823
Duke Energy Florida | Debt Maturing November 2021, 0.391%, floating interest rate | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	0.372%
Current maturities of long-term debt	$ 200
Duke Energy Progress
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 1,207	603
Duke Energy Progress | Debt Maturing February 2022, 0.305%, floating interest rate | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	0.305%
Current maturities of long-term debt	$ 700
Duke Energy Progress | Debt Maturing May 2022, 2.800%, interest rate | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	2.80%
Current maturities of long-term debt	$ 500
Progress Energy
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 1,932	1,426
Progress Energy | Debt Maturing April 2022, 3.150% interest rate | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	3.15%
Current maturities of long-term debt	$ 450
Duke Energy Indiana
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 151	70
Duke Energy Indiana | Debt Maturing January 2022, 8.850% interest rate | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	8.85%
Current maturities of long-term debt	$ 53
Duke Energy Carolinas
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 357	$ 506
Duke Energy Carolinas | Debt Maturing May 2022, 3.350% interest rate | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	3.35%
Current maturities of long-term debt	$ 350

XML

Debt and Credit Facilities (Narrative) (Details) - Master Credit Facility - USD ($)	1 Months Ended
	Oct. 31, 2021	Sep. 30, 2021	Mar. 31, 2021
Debt Instrument [Line Items]
Facility size		$ 8,000,000,000	$ 8,000,000,000
Duke Energy Ohio
Debt Instrument [Line Items]
Facility size		775,000,000
Duke Energy Indiana
Debt Instrument [Line Items]
Facility size		$ 600,000,000
Subsequent event | Term Loan Facility | Duke Energy Ohio
Debt Instrument [Line Items]
Facility size	$ 100,000,000
Facility term	2 years
Subsequent event | Term Loan Facility | Duke Energy Kentucky
Debt Instrument [Line Items]
Facility size	$ 50,000,000
Facility term	2 years
Subsequent event | Term Loan Facility | Duke Energy Indiana
Debt Instrument [Line Items]
Facility size	$ 300,000,000
Facility term	2 years

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Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - Master Credit Facility - USD ($)	Sep. 30, 2021	Mar. 31, 2021
Line of Credit Facility [Line Items]
Facility size	$ 8,000,000,000	$ 8,000,000,000
Commercial paper	(1,611,000,000)
Outstanding letters of credit	(31,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity under the Master Credit Facility	6,277,000,000
Duke Energy Carolinas
Line of Credit Facility [Line Items]
Facility size	1,275,000,000
Commercial paper	(375,000,000)
Outstanding letters of credit	(4,000,000)
Available capacity under the Master Credit Facility	896,000,000
Duke Energy Progress
Line of Credit Facility [Line Items]
Facility size	1,150,000,000
Commercial paper	(253,000,000)
Outstanding letters of credit	(2,000,000)
Available capacity under the Master Credit Facility	895,000,000
Duke Energy Florida
Line of Credit Facility [Line Items]
Facility size	850,000,000
Commercial paper	(527,000,000)
Available capacity under the Master Credit Facility	323,000,000
Duke Energy Ohio
Line of Credit Facility [Line Items]
Facility size	775,000,000
Commercial paper	(419,000,000)
Available capacity under the Master Credit Facility	356,000,000
Duke Energy Indiana
Line of Credit Facility [Line Items]
Facility size	600,000,000
Commercial paper	(150,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity under the Master Credit Facility	369,000,000
Piedmont
Line of Credit Facility [Line Items]
Facility size	700,000,000
Commercial paper	(276,000,000)
Available capacity under the Master Credit Facility	424,000,000
Duke Energy (Parent) | Proceeds loaned to subsidiary registrants
Line of Credit Facility [Line Items]
Commercial paper	(625,000,000)
Duke Energy (Parent) | Duke Energy (Parent)
Line of Credit Facility [Line Items]
Facility size	2,650,000,000
Commercial paper	389,000,000
Outstanding letters of credit	(25,000,000)
Available capacity under the Master Credit Facility	$ 3,014,000,000

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Debt and Credit Facilities (Schedule of Other Credit Facilities) (Details) - Master Credit Facility - USD ($)	9 Months Ended
	Sep. 30, 2021	Mar. 31, 2021
Line of Credit Facility [Line Items]
Facility size	$ 8,000,000,000	$ 8,000,000,000
Duke Energy (Parent) Three-Year Revolving Credit Facility | Duke Energy (Parent)
Line of Credit Facility [Line Items]
Facility size	1,000,000,000
Amount drawn	$ 500,000,000
Facility term	3 years

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Goodwill (Rollforward of Goodwill) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill balance	$ 19,425	$ 19,425
Accumulated impairment charges	(122)	(122)
Goodwill, adjusted for accumulated impairment charges	19,303	19,303
Electric Utilities and Infrastructure
Goodwill [Line Items]
Goodwill balance	17,379	17,379
Goodwill, adjusted for accumulated impairment charges	17,379	17,379
Gas Utilities and Infrastructure
Goodwill [Line Items]
Goodwill balance	1,924	1,924
Goodwill, adjusted for accumulated impairment charges	1,924	1,924
Commercial Renewables
Goodwill [Line Items]
Goodwill balance	122	122
Accumulated impairment charges	$ (122)	$ (122)

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Goodwill (Narrative) (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill	$ 19,303,000,000	$ 19,303,000,000
Accumulated impairment charges	122,000,000	122,000,000
Electric Utilities and Infrastructure
Goodwill [Line Items]
Goodwill	17,379,000,000	17,379,000,000
Gas Utilities and Infrastructure
Goodwill [Line Items]
Goodwill	1,924,000,000	1,924,000,000
Duke Energy Ohio
Goodwill [Line Items]
Goodwill	920,000,000	920,000,000
Accumulated impairment charges	216,000,000	216,000,000
Duke Energy Ohio | Electric Utilities and Infrastructure
Goodwill [Line Items]
Goodwill	596,000,000	596,000,000
Duke Energy Ohio | Gas Utilities and Infrastructure
Goodwill [Line Items]
Goodwill	324,000,000	324,000,000
Progress Energy
Goodwill [Line Items]
Goodwill	3,655,000,000	3,655,000,000
Progress Energy | Electric Utilities and Infrastructure
Goodwill [Line Items]
Accumulated impairment charges	0	0
Piedmont
Goodwill [Line Items]
Goodwill	49,000,000	49,000,000
Piedmont | Gas Utilities and Infrastructure
Goodwill [Line Items]
Accumulated impairment charges	$ 0	$ 0

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Related Party Transactions (Other Revenue and Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Duke Energy Carolinas | Corporate governance and shared service expenses | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	$ 207	$ 198	$ 653	$ 528
Duke Energy Carolinas | Indemnification coverages | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	6	5	18	15
Duke Energy Carolinas | JDA | Duke Energy Progress
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	68	28	133	72
Related party transaction, other revenues from transactions with related party	6	6	32	16
Duke Energy Carolinas | Intercompany natural gas purchases and sales | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	14	10	43	26
Progress Energy | Corporate governance and shared service expenses | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	201	185	615	520
Progress Energy | Indemnification coverages | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	10	9	31	27
Progress Energy | JDA | Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	6	6	32	16
Related party transaction, other revenues from transactions with related party	68	28	133	72
Progress Energy | Intercompany natural gas purchases and sales | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	19	18	56	56
Duke Energy Progress | Corporate governance and shared service expenses | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	121	113	367	301
Duke Energy Progress | Indemnification coverages | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	4	4	14	13
Duke Energy Progress | JDA | Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	6	6	32	16
Related party transaction, other revenues from transactions with related party	68	28	133	72
Duke Energy Progress | Intercompany natural gas purchases and sales | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	19	18	56	56
Duke Energy Florida | Corporate governance and shared service expenses | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	80	72	248	219
Duke Energy Florida | Indemnification coverages | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	6	5	17	14
Duke Energy Ohio | Corporate governance and shared service expenses | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	79	80	237	241
Duke Energy Ohio | Indemnification coverages | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1	1	3	3
Duke Energy Indiana | Corporate governance and shared service expenses | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	96	102	302	300
Duke Energy Indiana | Indemnification coverages | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	2	2	6	6
Piedmont | Corporate governance and shared service expenses | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	32	31	101	102
Piedmont | Indemnification coverages | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1	1	3	2
Piedmont | Intercompany natural gas purchases and sales | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, other revenues from transactions with related party	33	28	99	82
Piedmont | Natural gas storage and transportation costs | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	$ 6	$ 6	$ 17	$ 17

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Related Party Transactions (Intercompany Income Taxes) (Details) - Affiliated Entity - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Duke Energy Carolinas
Related Party Transaction [Line Items]
Intercompany income tax payable	$ 133	$ 31
Progress Energy
Related Party Transaction [Line Items]
Intercompany income tax receivable	36
Intercompany income tax payable		33
Duke Energy Progress
Related Party Transaction [Line Items]
Intercompany income tax payable	51	46
Duke Energy Florida
Related Party Transaction [Line Items]
Intercompany income tax receivable	8
Intercompany income tax payable		35
Duke Energy Ohio
Related Party Transaction [Line Items]
Intercompany income tax receivable	1
Intercompany income tax payable		2
Duke Energy Indiana
Related Party Transaction [Line Items]
Intercompany income tax receivable		9
Intercompany income tax payable	17
Piedmont
Related Party Transaction [Line Items]
Intercompany income tax receivable	$ 14	$ 10

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Derivatives and Hedging (Notional Amounts of Derivative Instruments) (Details) Mcf in Millions, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) GWh Mcf	Dec. 31, 2020 USD ($) GWh Mcf
Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 3,465	$ 1,809
Commodity contracts | Cash flow hedges
Derivative [Line Items]
Notional amount, energy measure (in gigawatt-hours) | GWh	10,159	22,048
Commodity contracts | Electricity (GWh)(a)
Derivative [Line Items]
Notional amount, energy measure (in gigawatt-hours) | GWh	29,044	35,409
Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	772	678
Designated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 2,094	$ 632
Designated contracts | Interest Rate Contracts | VIE primary beneficiary
Derivative [Line Items]
Notional amount	594	632
Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	1,371	1,177
Undesignated contracts | Interest Rate Contracts | VIE primary beneficiary
Derivative [Line Items]
Notional amount	94
Duke Energy Carolinas | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 350	$ 400
Duke Energy Carolinas | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	230	145
Duke Energy Carolinas | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 350	$ 400
Progress Energy | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 900	$ 750
Progress Energy | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	190	158
Progress Energy | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 900	$ 750
Duke Energy Progress | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 400	$ 750
Duke Energy Progress | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	190	158
Duke Energy Progress | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 400	$ 750
Duke Energy Florida | Interest Rate Contracts
Derivative [Line Items]
Notional amount	500
Duke Energy Florida | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	500
Duke Energy Ohio | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 27	$ 27
Duke Energy Ohio | Commodity contracts | Electricity (GWh)(a)
Derivative [Line Items]
Notional amount, energy measure (in gigawatt-hours) | GWh	3,004	2,559
Duke Energy Ohio | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 27	$ 27
Duke Energy Indiana | Commodity contracts | Electricity (GWh)(a)
Derivative [Line Items]
Notional amount, energy measure (in gigawatt-hours) | GWh	15,881	10,802
Duke Energy Indiana | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	7	2
Piedmont | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	345	373

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Derivatives and Hedging (Location and Fair Value Amounts of Derivatives Reflected in the Condensed Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	$ 543	$ 61
Location and fair value amounts of derivatives (Liability)	415	324
Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	363	48
Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	180	13
Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	134	64
Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	281	260
Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	536	43
Location and fair value amounts of derivatives (Liability)	318	251
Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	7	18
Location and fair value amounts of derivatives (Liability)	97	73
Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	359	30
Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	177	13
Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	33	30
Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	128	137
Not Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	2	18
Not Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	19	5
Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	4	5
Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	37	14
Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	120	70
Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	2
Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	3
Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	45	15
Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	29	48
Duke Energy Carolinas
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	271	20
Location and fair value amounts of derivatives (Liability)	18	20
Duke Energy Carolinas | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	171	14
Duke Energy Carolinas | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	100	6
Duke Energy Carolinas | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	18	17
Duke Energy Carolinas | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		3
Duke Energy Carolinas | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	271	20
Location and fair value amounts of derivatives (Liability)	12	16
Duke Energy Carolinas | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	6	4
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	171	14
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	100	6
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	12	13
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		3
Duke Energy Carolinas | Not Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	6	4
Progress Energy
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	215	33
Location and fair value amounts of derivatives (Liability)	12	29
Progress Energy | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	137	27
Progress Energy | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	78	6
Progress Energy | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	12	2
Progress Energy | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		27
Progress Energy | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	213	15
Location and fair value amounts of derivatives (Liability)		29
Progress Energy | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	2	18
Location and fair value amounts of derivatives (Liability)	12
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	135	9
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	78	6
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		2
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		27
Progress Energy | Not Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	2	18
Progress Energy | Not Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	12
Duke Energy Progress
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	215	33
Location and fair value amounts of derivatives (Liability)		14
Duke Energy Progress | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	137	27
Duke Energy Progress | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	78	6
Duke Energy Progress | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		2
Duke Energy Progress | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		12
Duke Energy Progress | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	213	15
Location and fair value amounts of derivatives (Liability)		14
Duke Energy Progress | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	2	18
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	135	9
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	78	6
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		2
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		12
Duke Energy Progress | Not Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	2	18
Duke Energy Florida
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	12
Duke Energy Florida | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	12
Duke Energy Florida | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	12
Duke Energy Florida | Not Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	12
Duke Energy Ohio
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	4	1
Location and fair value amounts of derivatives (Liability)	5	6
Duke Energy Ohio | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	4	1
Duke Energy Ohio | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	1	1
Duke Energy Ohio | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	4	5
Duke Energy Ohio | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	4	1
Duke Energy Ohio | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	5	6
Duke Energy Ohio | Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	4	1
Duke Energy Ohio | Not Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	1	1
Duke Energy Ohio | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	4	5
Duke Energy Indiana
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	36	6
Location and fair value amounts of derivatives (Liability)	2	1
Duke Energy Indiana | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	36	6
Duke Energy Indiana | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	2	1
Duke Energy Indiana | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	36	6
Location and fair value amounts of derivatives (Liability)	2	1
Duke Energy Indiana | Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	36	6
Duke Energy Indiana | Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	2	1
Piedmont
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	12	1
Location and fair value amounts of derivatives (Liability)	148	122
Piedmont | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	12	1
Piedmont | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	20	15
Piedmont | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	128	107
Piedmont | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	12	1
Location and fair value amounts of derivatives (Liability)	148	122
Piedmont | Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	12	1
Piedmont | Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	20	15
Piedmont | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	$ 128	$ 107

XML

Derivatives and Hedging (Schedule of Offsetting Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 543	$ 61
Net amounts recognized on the Condensed Consolidated Balance Sheet	543	61
Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	363	48
Gross amounts offset	(143)	(3)
Net amounts recognized on the Condensed Consolidated Balance Sheet	220	45
Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	180	13
Gross amounts offset	(71)	(5)
Net amounts recognized on the Condensed Consolidated Balance Sheet	109	8
Duke Energy Carolinas
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	271	20
Net amounts recognized on the Condensed Consolidated Balance Sheet	271	20
Duke Energy Carolinas | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	171	14
Gross amounts offset	(87)	(2)
Net amounts recognized on the Condensed Consolidated Balance Sheet	84	12
Duke Energy Carolinas | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	100	6
Gross amounts offset	(45)	(1)
Net amounts recognized on the Condensed Consolidated Balance Sheet	55	5
Progress Energy
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	215	33
Net amounts recognized on the Condensed Consolidated Balance Sheet	215	33
Progress Energy | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	137	27
Gross amounts offset	(56)	(2)
Net amounts recognized on the Condensed Consolidated Balance Sheet	81	25
Progress Energy | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	78	6
Gross amounts offset	(26)	(4)
Net amounts recognized on the Condensed Consolidated Balance Sheet	52	2
Duke Energy Progress
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	215	33
Net amounts recognized on the Condensed Consolidated Balance Sheet	215	33
Duke Energy Progress | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	137	27
Gross amounts offset	(56)	(2)
Net amounts recognized on the Condensed Consolidated Balance Sheet	81	25
Duke Energy Progress | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	78	6
Gross amounts offset	(26)	(4)
Net amounts recognized on the Condensed Consolidated Balance Sheet	52	2
Duke Energy Ohio
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	4	1
Duke Energy Ohio | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	4	1
Net amounts recognized on the Condensed Consolidated Balance Sheet	4	1
Duke Energy Indiana
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	36	6
Net amounts recognized on the Condensed Consolidated Balance Sheet	36	6
Duke Energy Indiana | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	36	6
Net amounts recognized on the Condensed Consolidated Balance Sheet	36	6
Piedmont
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	12	1
Net amounts recognized on the Condensed Consolidated Balance Sheet	12	1
Piedmont | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	12	1
Net amounts recognized on the Condensed Consolidated Balance Sheet	$ 12	$ 1

XML

Derivatives and Hedging (Schedule of Offsetting Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 415	$ 324
Net amounts recognized on the Condensed Consolidated Balance Sheet	415	324
Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	134	64
Gross amounts offset		(3)
Net amounts recognized on the Condensed Consolidated Balance Sheet	134	61
Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	281	260
Gross amounts offset		(5)
Net amounts recognized on the Condensed Consolidated Balance Sheet	281	255
Duke Energy Carolinas
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	18	20
Net amounts recognized on the Condensed Consolidated Balance Sheet	18	20
Duke Energy Carolinas | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	18	17
Gross amounts offset		(2)
Net amounts recognized on the Condensed Consolidated Balance Sheet	18	15
Duke Energy Carolinas | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized		3
Gross amounts offset		(1)
Net amounts recognized on the Condensed Consolidated Balance Sheet		2
Progress Energy
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	12	29
Net amounts recognized on the Condensed Consolidated Balance Sheet	12	29
Progress Energy | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	12	2
Gross amounts offset		(2)
Net amounts recognized on the Condensed Consolidated Balance Sheet	12
Progress Energy | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized		27
Gross amounts offset		(4)
Net amounts recognized on the Condensed Consolidated Balance Sheet		23
Duke Energy Progress
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized		14
Net amounts recognized on the Condensed Consolidated Balance Sheet		14
Duke Energy Progress | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized		2
Gross amounts offset		(2)
Duke Energy Progress | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized		12
Gross amounts offset		(4)
Net amounts recognized on the Condensed Consolidated Balance Sheet		8
Duke Energy Florida
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	12
Net amounts recognized on the Condensed Consolidated Balance Sheet	12
Duke Energy Florida | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	12
Net amounts recognized on the Condensed Consolidated Balance Sheet	12
Duke Energy Ohio
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	5	6
Duke Energy Ohio | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	1	1
Net amounts recognized on the Condensed Consolidated Balance Sheet	1	1
Duke Energy Ohio | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	4	5
Net amounts recognized on the Condensed Consolidated Balance Sheet	4	5
Duke Energy Indiana
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	2	1
Net amounts recognized on the Condensed Consolidated Balance Sheet	2	1
Duke Energy Indiana | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	2	1
Net amounts recognized on the Condensed Consolidated Balance Sheet	2	1
Piedmont
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	148	122
Net amounts recognized on the Condensed Consolidated Balance Sheet	148	122
Piedmont | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	20	15
Net amounts recognized on the Condensed Consolidated Balance Sheet	20	15
Piedmont | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	128	107
Net amounts recognized on the Condensed Consolidated Balance Sheet	$ 128	$ 107

XML

Investments in Debt and Equity Securities (Estimated Fair Value of Investments in Debt and Equity Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale
Estimated Fair Value	$ 3,226
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	4,885	$ 4,387
Unrealized Holding Losses	52	55
Estimated Fair Value	10,376	9,687
Duke Energy Carolinas
Debt Securities, Available-for-sale
Estimated Fair Value	1,461
Progress Energy
Debt Securities, Available-for-sale
Estimated Fair Value	1,508
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	2,022	1,769
Unrealized Holding Losses	30	31
Estimated Fair Value	4,472	4,296
Duke Energy Progress
Debt Securities, Available-for-sale
Estimated Fair Value	1,030
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	1,927	1,687
Unrealized Holding Losses	26	31
Estimated Fair Value	3,874	3,529
Duke Energy Florida
Debt Securities, Available-for-sale
Estimated Fair Value	478
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	95	82
Unrealized Holding Losses	4
Estimated Fair Value	597	663
Duke Energy Indiana
Debt Securities, Available-for-sale
Estimated Fair Value	46
NDTF
Available-for-sale Securities
Cash and cash equivalents	164	177
Equity Securities, FV-NI
Equity Securities, FV-NI, Accumulated Unrealized Gain	4,700	4,138
Equity Securities, FV-NI, Accumulated Unrealized Loss	35	54
Equity securities, FV-NI	6,754	6,235
Debt Securities, Available-for-sale
Estimated Fair Value	2,943	2,717
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	4,795	4,295
Unrealized Holding Losses	50	55
Estimated Fair Value	9,861	9,129
NDTF | Duke Energy Carolinas
Available-for-sale Securities
Cash and cash equivalents	60	30
Equity Securities, FV-NI
Equity Securities, FV-NI, Accumulated Unrealized Gain	2,725	2,442
Equity Securities, FV-NI, Accumulated Unrealized Loss	14	23
Equity securities, FV-NI	3,912	3,685
Debt Securities, Available-for-sale
Estimated Fair Value	1,461	1,250
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	2,775	2,529
Unrealized Holding Losses	20	24
Estimated Fair Value	5,433	4,965
NDTF | Progress Energy
Available-for-sale Securities
Cash and cash equivalents	104	147
Equity Securities, FV-NI
Equity Securities, FV-NI, Accumulated Unrealized Gain	1,975	1,696
Equity Securities, FV-NI, Accumulated Unrealized Loss	21	31
Equity securities, FV-NI	2,842	2,550
Debt Securities, Available-for-sale
Estimated Fair Value	1,482	1,467
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	2,020	1,766
Unrealized Holding Losses	30	31
Estimated Fair Value	4,428	4,164
NDTF | Duke Energy Progress
Available-for-sale Securities
Cash and cash equivalents	92	76
Equity Securities, FV-NI
Equity Securities, FV-NI, Accumulated Unrealized Gain	1,882	1,617
Equity Securities, FV-NI, Accumulated Unrealized Loss	21	31
Equity securities, FV-NI	2,736	2,459
Debt Securities, Available-for-sale
Estimated Fair Value	1,030	993
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	1,927	1,687
Unrealized Holding Losses	26	31
Estimated Fair Value	3,858	3,528
NDTF | Duke Energy Florida
Available-for-sale Securities
Cash and cash equivalents	12	71
Equity Securities, FV-NI
Equity Securities, FV-NI, Accumulated Unrealized Gain	93	79
Equity securities, FV-NI	106	91
Debt Securities, Available-for-sale
Estimated Fair Value	452	474
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	93	79
Unrealized Holding Losses	4
Estimated Fair Value	570	636
Other Investments
Available-for-sale Securities
Cash and cash equivalents	87	127
Equity Securities, FV-NI
Equity Securities, FV-NI, Accumulated Unrealized Gain	83	79
Equity securities, FV-NI	145	146
Debt Securities, Available-for-sale
Estimated Fair Value	283	285
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	90	92
Unrealized Holding Losses	2
Estimated Fair Value	515	558
Other Investments | Progress Energy
Available-for-sale Securities
Cash and cash equivalents	18	106
Debt Securities, Available-for-sale
Estimated Fair Value	26	26
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	2	3
Estimated Fair Value	44	132
Other Investments | Duke Energy Progress
Available-for-sale Securities
Cash and cash equivalents	16	1
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Estimated Fair Value	16	1
Other Investments | Duke Energy Florida
Available-for-sale Securities
Cash and cash equivalents	1	1
Debt Securities, Available-for-sale
Estimated Fair Value	26	26
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	2	3
Estimated Fair Value	27	27
Other Investments | Duke Energy Indiana
Available-for-sale Securities
Cash and cash equivalents	19	1
Equity Securities, FV-NI
Equity Securities, FV-NI, Accumulated Unrealized Gain	56	58
Equity securities, FV-NI	90	97
Debt Securities, Available-for-sale
Estimated Fair Value	46	45
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	57	59
Unrealized Holding Losses	1
Estimated Fair Value	155	143
Corporate debt securities | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	44	76
Gross Unrealized Holding Losses	5	1
Estimated Fair Value	847	806
Corporate debt securities | NDTF | Duke Energy Carolinas
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	27	49
Gross Unrealized Holding Losses	3	1
Estimated Fair Value	495	510
Corporate debt securities | NDTF | Progress Energy
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	17	27
Gross Unrealized Holding Losses	2
Estimated Fair Value	352	296
Corporate debt securities | NDTF | Duke Energy Progress
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	17	27
Gross Unrealized Holding Losses	2
Estimated Fair Value	287	296
Corporate debt securities | NDTF | Duke Energy Florida
Debt Securities, Available-for-sale
Estimated Fair Value	65
Corporate debt securities | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	4	8
Gross Unrealized Holding Losses	1
Estimated Fair Value	130	110
Corporate debt securities | Other Investments | Duke Energy Indiana
Debt Securities, Available-for-sale
Estimated Fair Value	5	3
Municipal bonds | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	13	22
Gross Unrealized Holding Losses	1
Estimated Fair Value	296	370
Municipal bonds | NDTF | Duke Energy Carolinas
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	1	6
Estimated Fair Value	24	91
Municipal bonds | NDTF | Progress Energy
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	12	16
Gross Unrealized Holding Losses	1
Estimated Fair Value	272	279
Municipal bonds | NDTF | Duke Energy Progress
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	12	16
Gross Unrealized Holding Losses	1
Estimated Fair Value	272	279
Municipal bonds | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	3	5
Gross Unrealized Holding Losses	1
Estimated Fair Value	69	86
Municipal bonds | Other Investments | Progress Energy
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	2	3
Estimated Fair Value	26	26
Municipal bonds | Other Investments | Duke Energy Florida
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	2	3
Estimated Fair Value	26	26
Municipal bonds | Other Investments | Duke Energy Indiana
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	1	1
Gross Unrealized Holding Losses	1
Estimated Fair Value	36	38
U.S. government bonds | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	34	51
Gross Unrealized Holding Losses	8
Estimated Fair Value	1,605	1,361
U.S. government bonds | NDTF | Duke Energy Carolinas
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	18	25
Gross Unrealized Holding Losses	2
Estimated Fair Value	752	475
U.S. government bonds | NDTF | Progress Energy
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	16	26
Gross Unrealized Holding Losses	6
Estimated Fair Value	853	886
U.S. government bonds | NDTF | Duke Energy Progress
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	16	26
Gross Unrealized Holding Losses	2
Estimated Fair Value	466	412
U.S. government bonds | NDTF | Duke Energy Florida
Debt Securities, Available-for-sale
Gross Unrealized Holding Losses	4
Estimated Fair Value	387	474
U.S. government bonds | Other Investments
Debt Securities, Available-for-sale
Estimated Fair Value	50	42
U.S. government bonds | Other Investments | Duke Energy Indiana
Debt Securities, Available-for-sale
Estimated Fair Value	5	4
Other debt securities | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	4	8
Gross Unrealized Holding Losses	1
Estimated Fair Value	195	180
Other debt securities | NDTF | Duke Energy Carolinas
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	4	7
Gross Unrealized Holding Losses	1
Estimated Fair Value	190	174
Other debt securities | NDTF | Progress Energy
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains		1
Estimated Fair Value	5	6
Other debt securities | NDTF | Duke Energy Progress
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains		1
Estimated Fair Value	5	6
Other debt securities | Other Investments
Debt Securities, Available-for-sale
Estimated Fair Value	$ 34	$ 47

XML

Investments in Debt and Equity Securities (Realized Gains and Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
FV-NI:
Realized gains	$ 34	$ 13	$ 320	$ 338
Realized losses	40	16	100	148
AFS:
Realized gains	17	26	51	73
Realized losses	15	19	46	38
Duke Energy Carolinas
FV-NI:
Realized gains	25	10	243	46
Realized losses	29	12	68	82
AFS:
Realized gains	10	20	35	50
Realized losses	10	17	32	30
Progress Energy
FV-NI:
Realized gains	9	3	77	292
Realized losses	11	4	32	66
AFS:
Realized gains	7	6	14	17
Realized losses	6	2	12	7
Duke Energy Progress
FV-NI:
Realized gains	9	3	76	43
Realized losses	11	4	31	51
AFS:
Realized gains	6	6	13	17
Realized losses	5	$ 2	11	7
Duke Energy Florida
FV-NI:
Realized gains			1	249
Realized losses			1	$ 15
AFS:
Realized gains	1		1
Realized losses	$ 1		$ 1

XML

Investments in Debt and Equity Securities (Maturities) (Details) $ in Millions	Sep. 30, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	$ 151
Due after one through five years	954
Due after five through 10 years	639
Due after 10 years	1,482
Total	3,226
Duke Energy Carolinas
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	3
Due after one through five years	343
Due after five through 10 years	268
Due after 10 years	847
Total	1,461
Progress Energy
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	121
Due after one through five years	548
Due after five through 10 years	286
Due after 10 years	553
Total	1,508
Duke Energy Progress
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	22
Due after one through five years	244
Due after five through 10 years	247
Due after 10 years	517
Total	1,030
Duke Energy Florida
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	99
Due after one through five years	304
Due after five through 10 years	39
Due after 10 years	36
Total	478
Duke Energy Indiana
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	5
Due after one through five years	18
Due after five through 10 years	8
Due after 10 years	15
Total	$ 46

XML

Fair Value Measurements (Fair Value Measurement Amounts for Assets and Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	$ 3,226
Derivative assets	543	$ 61
Total assets	10,919	9,748
Derivative liabilities	(415)	(324)
Net assets (liabilities)	10,504	9,424
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	27	1
Total assets	8,171	7,551
Derivative liabilities	(2)
Net assets (liabilities)	8,169	7,551
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	490	53
Total assets	2,673	2,144
Derivative liabilities	(256)	(240)
Net assets (liabilities)	2,417	1,904
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	26	7
Total assets	26	7
Derivative liabilities	(157)	(84)
Net assets (liabilities)	(131)	(77)
Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	49	46
Net assets (liabilities)	49	46
NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	164	177
Equity securities, FV-NI	6,754	6,235
Debt securities, available-for-sale	2,943	2,717
NDTF | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	164	177
Debt securities, available-for-sale	998	874
NDTF | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,945	1,843
NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	6,754	6,235
NDTF equity securities | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	6,705	6,189
NDTF equity securities | Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	49	46
Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	87	127
Equity securities, FV-NI	145	146
Debt securities, available-for-sale	283	285
Other Investments | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	87	127
Equity securities, FV-NI	145	146
Debt securities, available-for-sale	45	37
Other Investments | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	238	248
Duke Energy Carolinas
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,461
Derivative assets	271	20
Total assets	5,704	4,985
Derivative liabilities	(18)	(20)
Net assets (liabilities)	5,686	4,965
Duke Energy Carolinas | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	4,282	3,861
Net assets (liabilities)	4,282	3,861
Duke Energy Carolinas | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	271	20
Total assets	1,373	1,078
Derivative liabilities	(18)	(20)
Net assets (liabilities)	1,355	1,058
Duke Energy Carolinas | Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	49	46
Net assets (liabilities)	49	46
Duke Energy Carolinas | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	60	30
Equity securities, FV-NI	3,912	3,685
Debt securities, available-for-sale	1,461	1,250
Duke Energy Carolinas | NDTF | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	60	30
Debt securities, available-for-sale	359	192
Duke Energy Carolinas | NDTF | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,102	1,058
Duke Energy Carolinas | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	3,912	3,685
Duke Energy Carolinas | NDTF equity securities | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	3,863	3,639
Duke Energy Carolinas | NDTF equity securities | Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	49	46
Progress Energy
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,508
Derivative assets	215	33
Total assets	4,687	4,329
Derivative liabilities	(12)	(29)
Net assets (liabilities)	4,675	4,300
Progress Energy | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	3,603	3,485
Net assets (liabilities)	3,603	3,485
Progress Energy | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	215	33
Total assets	1,084	844
Derivative liabilities	(12)	(29)
Net assets (liabilities)	1,072	815
Progress Energy | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	104	147
Equity securities, FV-NI	2,842	2,550
Debt securities, available-for-sale	1,482	1,467
Progress Energy | NDTF | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	104	147
Debt securities, available-for-sale	639	682
Progress Energy | NDTF | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	843	785
Progress Energy | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	2,842	2,550
Progress Energy | NDTF equity securities | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	2,842	2,550
Progress Energy | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	18	106
Debt securities, available-for-sale	26	26
Progress Energy | Other Investments | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	18	106
Progress Energy | Other Investments | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	26	26
Duke Energy Progress
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,030
Derivative assets	215	33
Total assets	4,089	3,562
Derivative liabilities		(14)
Net assets (liabilities)	4,089	3,548
Duke Energy Progress | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	3,122	2,773
Net assets (liabilities)	3,122	2,773
Duke Energy Progress | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	215	33
Total assets	967	789
Derivative liabilities		(14)
Net assets (liabilities)	967	775
Duke Energy Progress | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	92	76
Equity securities, FV-NI	2,736	2,459
Debt securities, available-for-sale	1,030	993
Duke Energy Progress | NDTF | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	92	76
Debt securities, available-for-sale	278	237
Duke Energy Progress | NDTF | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	752	756
Duke Energy Progress | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	2,736	2,459
Duke Energy Progress | NDTF equity securities | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	2,736	2,459
Duke Energy Progress | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	16	1
Duke Energy Progress | Other Investments | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	16	1
Duke Energy Florida
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	478
Total assets	597	663
Derivative liabilities	(12)
Net assets (liabilities)	585	663
Duke Energy Florida | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	480	608
Net assets (liabilities)	480	608
Duke Energy Florida | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	117	55
Derivative liabilities	(12)
Net assets (liabilities)	105	55
Duke Energy Florida | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	12	71
Equity securities, FV-NI	106	91
Debt securities, available-for-sale	452	474
Duke Energy Florida | NDTF | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	12	71
Debt securities, available-for-sale	361	445
Duke Energy Florida | NDTF | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	91	29
Duke Energy Florida | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	106	91
Duke Energy Florida | NDTF equity securities | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	106	91
Duke Energy Florida | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1	1
Debt securities, available-for-sale	26	26
Duke Energy Florida | Other Investments | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1	1
Duke Energy Florida | Other Investments | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	26	26
Duke Energy Indiana
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	46
Derivative assets	36	6
Total assets	191	149
Derivative liabilities	(2)	(1)
Net assets (liabilities)	189	148
Duke Energy Indiana | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	12
Total assets	121	98
Derivative liabilities	(2)	(1)
Net assets (liabilities)	119	97
Duke Energy Indiana | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	46	45
Net assets (liabilities)	46	45
Duke Energy Indiana | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	24	6
Total assets	24	6
Net assets (liabilities)	24	6
Duke Energy Indiana | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	19	1
Equity securities, FV-NI	90	97
Debt securities, available-for-sale	46	45
Duke Energy Indiana | Other Investments | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	19	1
Equity securities, FV-NI	90	97
Duke Energy Indiana | Other Investments | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	46	45
Piedmont
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	12	1
Derivative liabilities	(148)	(122)
Net assets (liabilities)	(136)	(121)
Piedmont | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	12	1
Net assets (liabilities)	12	1
Piedmont | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	(148)	(122)
Net assets (liabilities)	$ (148)	$ (122)

XML

Fair Value Measurements (Reconciliation of Assets and Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivatives (net)
Balance at beginning of period	$ (131)	$ (92)	$ (77)	$ (102)
Total pretax realized or unrealized losses included in comprehensive income	(11)	(102)	(86)	(102)
Purchases, sales, issuances and settlements:
Purchases			21	14
Settlements	4	(3)	(4)	(18)
Total gains (losses) included on the Condensed Consolidated Balance Sheet	7	(6)	15	5
Balance at end of period	(131)	(203)	(131)	(203)
Duke Energy Indiana
Derivatives (net)
Balance at beginning of period	22	10	6	11
Purchases, sales, issuances and settlements:
Purchases			18	10
Settlements	(3)	(3)	(12)	(13)
Total gains (losses) included on the Condensed Consolidated Balance Sheet	5	1	12
Balance at end of period	$ 24	8	$ 24	8
Piedmont
Derivatives (net)
Balance at beginning of period		(105)		(117)
Purchases, sales, issuances and settlements:
Total (losses) gains and settlements		(6)		6
Balance at end of period		$ (111)		$ (111)

XML

Fair Value Measurements (Quantitative Level 3 Fair Value Disclosures) (Details) $ in Millions	Sep. 30, 2021 USD ($) $ / MWh	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($) $ / MWh	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $	$ (131)	$ (131)	$ (77)	$ (203)	$ (92)	$ (102)
Electricity contracts | Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $			$ (84)
Electricity contracts | Discounted cash flow | Minimum
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu)			14.68
Electricity contracts | Discounted cash flow | Maximum
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu)			151.84
Electricity contracts | Discounted cash flow | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu)			28,840,000
Electricity contracts | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $	$ (157)
Electricity contracts | RTO auction pricing | Minimum
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu)	18.02
Electricity contracts | RTO auction pricing | Maximum
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu)	143.85
Electricity contracts | RTO auction pricing | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu)	38.43
Duke Energy Ohio | FTRs | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $	$ 2		$ 1
Duke Energy Ohio | FTRs | RTO auction pricing | Minimum
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu)	0.06		0.25
Duke Energy Ohio | FTRs | RTO auction pricing | Maximum
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu)	1.27		1.68
Duke Energy Ohio | FTRs | RTO auction pricing | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu)	0.71		0.79
Duke Energy Indiana
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $	$ 24	$ 22	$ 6	$ 8	$ 10	$ 11
Duke Energy Indiana | FTRs | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $	$ 24		$ 6
Duke Energy Indiana | FTRs | RTO auction pricing | Minimum
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu)	(1.11)		(2.40)
Duke Energy Indiana | FTRs | RTO auction pricing | Maximum
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu)	8.55		7.41
Duke Energy Indiana | FTRs | RTO auction pricing | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu)	1.61		1.05

XML

Fair Value Measurements (Other Fair Value Disclosure) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Book Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 62,802	$ 59,863
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	69,381	69,292
Piedmont Natural Gas and Progress Energy
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized debt discount (premium), net	1,300	1,300
Duke Energy Carolinas | Book Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	12,975	12,218
Duke Energy Carolinas | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	14,964	14,917
Progress Energy | Book Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	19,488	19,264
Progress Energy | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	22,593	23,470
Duke Energy Progress | Book Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	9,848	9,258
Duke Energy Progress | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	10,915	10,862
Duke Energy Florida | Book Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	7,549	7,915
Duke Energy Florida | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	8,932	9,756
Duke Energy Ohio | Book Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	3,092	3,089
Duke Energy Ohio | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	3,517	3,650
Duke Energy Indiana | Book Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	4,092	4,091
Duke Energy Indiana | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	4,883	5,204
Piedmont | Book Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	2,968	2,780
Piedmont | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 3,320	$ 3,306

XML

Variable Interest Entities (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Feb. 28, 2021
Variable Interest Entities [Line Items]
Equity in earnings (losses) of unconsolidated affiliates		$ 22,000,000	$ (80,000,000)	$ 14,000,000	$ (2,004,000,000)
ACP | ACP
Variable Interest Entities [Line Items]
Equity in earnings (losses) of unconsolidated affiliates	$ (2,100,000,000)
ACP | Current liabilities | ACP
Variable Interest Entities [Line Items]
Guarantor obligations settled							$ 855,000,000
VIE primary beneficiary
Variable Interest Entities [Line Items]
Variable interest entity, financial or other support, amount				$ 0		$ 0
VIE primary beneficiary | CRC
Variable Interest Entities [Line Items]
Percent of proceeds received as cash		75.00%		75.00%
Percent of proceeds received as subordinated note		25.00%		25.00%
Minimum equity balance required by Cinergy Receivables		$ 3,000,000		$ 3,000,000
VIE not primary beneficiary | ACP
Variable Interest Entities [Line Items]
Equity in earnings (losses) of unconsolidated affiliates			$ (163,000,000)		$ (4,505,000,000)
VIE not primary beneficiary | ACP
Variable Interest Entities [Line Items]
Variable interest entity ownership interest				47.00%
VIE not primary beneficiary | VIE With Ownership In Portfolio Of Wind Projects
Variable Interest Entities [Line Items]
Variable interest entity ownership interest				50.00%
VIE not primary beneficiary | OVEC
Variable Interest Entities [Line Items]
Variable interest entity ownership interest				9.00%

XML

Variable Interest Entities (Schedule of Accounts Receivable Securitizations) (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Variable Interest Entities [Line Items]
Long-Term Debt	$ 57,929,000,000	$ 55,625,000,000
Duke Energy Carolinas
Variable Interest Entities [Line Items]
Long-Term Debt	12,318,000,000	11,412,000,000
Duke Energy Progress
Variable Interest Entities [Line Items]
Long-Term Debt	8,491,000,000	8,505,000,000
Duke Energy Florida
Variable Interest Entities [Line Items]
Long-Term Debt	7,273,000,000	7,092,000,000
CRC | VIE primary beneficiary
Variable Interest Entities [Line Items]
Facility size	350,000,000
Long-Term Debt	350,000,000	350,000,000
Accounts receivable from securitization	535,000,000	547,000,000
DERF | Duke Energy Carolinas | VIE primary beneficiary
Variable Interest Entities [Line Items]
Facility size	475,000,000
Long-Term Debt	475,000,000	364,000,000
Accounts receivable from securitization	915,000,000	696,000,000
DEPR | Duke Energy Progress | VIE primary beneficiary
Variable Interest Entities [Line Items]
Facility size	350,000,000
Long-Term Debt	350,000,000	250,000,000
Accounts receivable from securitization	532,000,000	500,000,000
DEFR | Duke Energy Florida | VIE primary beneficiary
Variable Interest Entities [Line Items]
Facility size	250,000,000
Long-Term Debt	250,000,000	250,000,000
Accounts receivable from securitization	$ 443,000,000	$ 397,000,000

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Variable Interest Entities (Schedule of Consolidated VIEs) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Variable Interest Entities [Line Items]
Regulatory Assets: Current	$ 1,791	$ 1,641
Current Assets: Other	768	462
Other Noncurrent Assets: Regulatory assets	12,247	12,421
Property, Plant and Equipment: Cost	160,652	155,580
Accumulated depreciation and amortization	(50,543)	(48,827)
Other Noncurrent Assets: Other	3,686	3,601
Current Liabilities: Other	2,239	2,936
Current maturities of long-term debt	4,873	4,238
Long-Term Debt	57,929	55,625
Other Noncurrent Liabilities: AROs	12,278	12,286
Other Noncurrent Liabilities: Other	1,714	1,719
Duke Energy Florida
Variable Interest Entities [Line Items]
Regulatory Assets: Current	365	265
Current Assets: Other	35	41
Other Noncurrent Assets: Regulatory assets	1,829	1,799
Property, Plant and Equipment: Cost	23,300	22,123
Accumulated depreciation and amortization	(5,839)	(5,560)
Other Noncurrent Assets: Other	351	335
Current Liabilities: Other	403	374
Current maturities of long-term debt	276	823
Long-Term Debt	7,273	7,092
Other Noncurrent Liabilities: AROs	443	514
Other Noncurrent Liabilities: Other	265	209
DEFPF | Duke Energy Florida | VIE primary beneficiary
Variable Interest Entities [Line Items]
Receivables of VIEs	6	4
Regulatory Assets: Current	54	53
Current Assets: Other	17	39
Other Noncurrent Assets: Regulatory assets	896	937
Current Liabilities: Other	2	10
Current maturities of long-term debt	56	55
Long-Term Debt	946	1,002
Commercial Renewables | VIE primary beneficiary
Variable Interest Entities [Line Items]
Current Assets: Other	330	257
Property, Plant and Equipment: Cost	7,315	6,394
Accumulated depreciation and amortization	(1,414)	(1,242)
Other Noncurrent Assets: Other	110	67
Current maturities of long-term debt	165	167
Long-Term Debt	1,552	1,569
Other Noncurrent Liabilities: AROs	167	148
Other Noncurrent Liabilities: Other	$ 341	$ 316

XML

Variable Interest Entities (Schedule of Non-Consolidated VIEs) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	$ 951	$ 961
Other noncurrent assets	3,686	3,601
Total Assets	167,007	162,388
Other current liabilities	2,239	2,936
Other, noncurrent liabilities	1,714	1,719
VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	480	530
Other noncurrent assets		31
Deferred tax asset	58
Total Assets	538	561
Other current liabilities	64	933
Other, noncurrent liabilities	66	18
Total liabilities	130	951
Net assets	408	(390)
Duke Energy Ohio
Variable Interest Entities [Line Items]
Other noncurrent assets	83	72
Total Assets	10,505	10,025
Other current liabilities	68	70
Other, noncurrent liabilities	92	99
Duke Energy Ohio | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Receivables from affiliated companies	47	83
Total Assets	47	83
Net assets	47	83
Duke Energy Indiana
Variable Interest Entities [Line Items]
Other noncurrent assets	276	253
Total Assets	14,428	14,041
Other current liabilities	104	83
Other, noncurrent liabilities	53	30
Duke Energy Indiana | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Receivables from affiliated companies	77	110
Total Assets	77	110
Net assets	77	110
Pipeline Investments | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	15
Other noncurrent assets		31
Deferred tax asset	58
Total Assets	73	31
Other current liabilities	61	928
Other, noncurrent liabilities	63	8
Total liabilities	124	936
Net assets	(51)	(905)
Commercial Renewables | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	465	530
Total Assets	465	530
Other current liabilities	3	5
Other, noncurrent liabilities	3	10
Total liabilities	6	15
Net assets	$ 459	$ 515

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Variable Interest Entities (Receivables Sold) (Details) - VIE not primary beneficiary - CRC - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Duke Energy Ohio
Variable Interest Entities [Line Items]
Receivables sold	$ 218	$ 270
Less: Retained interests	47	83
Net receivables sold	171	187
Duke Energy Indiana
Variable Interest Entities [Line Items]
Receivables sold	328	344
Less: Retained interests	77	110
Net receivables sold	$ 251	$ 234

XML

Variable Interest Entities (Sales and Cash Flows) (Details) - VIE not primary beneficiary - CRC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Duke Energy Ohio
Sales
Receivables sold	$ 486	$ 462	$ 1,490	$ 1,428
Loss recognized on sale	2	2	7	8
Cash flows
Cash proceeds from receivables sold	490	449	1,519	1,439
Collection fees received		1	1	1
Return received on retained interests	1	1	3	3
Duke Energy Indiana
Sales
Receivables sold	794	717	2,176	1,947
Loss recognized on sale	4	3	10	9
Cash flows
Cash proceeds from receivables sold	798	689	2,199	1,941
Collection fees received			1	1
Return received on retained interests	$ 1	$ 1	$ 4	$ 4

XML

Revenue (Remaining Performance Obligations) (Details) $ in Millions	Sep. 30, 2021 USD ($)
Progress Energy
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 278
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	6 months
Revenue, remaining performance obligation, amount	$ 24
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 107
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 44
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 45
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 7
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period
Revenue, remaining performance obligation, amount	$ 51
Duke Energy Progress
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 26
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	6 months
Revenue, remaining performance obligation, amount	$ 2
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 8
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 8
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 8
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period
Duke Energy Florida
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 252
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	6 months
Revenue, remaining performance obligation, amount	$ 22
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 99
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 36
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 37
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 7
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period
Revenue, remaining performance obligation, amount	$ 51
Duke Energy Indiana
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 64
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	6 months
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 1
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 9
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 14
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 15
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period
Revenue, remaining performance obligation, amount	$ 25
Piedmont
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 605
Piedmont | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	6 months
Revenue, remaining performance obligation, amount	$ 17
Piedmont | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 67
Piedmont | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 64
Piedmont | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 61
Piedmont | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 60
Piedmont | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period
Revenue, remaining performance obligation, amount	$ 336

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Revenue (Remaining Performance Obligations Total) (Details) $ in Millions	Sep. 30, 2021 USD ($)
Progress Energy
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 278
Duke Energy Progress
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	26
Duke Energy Florida
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	252
Duke Energy Indiana
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	64
Piedmont
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 605

XML

Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 6,894	$ 6,658	$ 18,655	$ 17,817
Revenue from sources other than contracts with customers	57	63	204	274
Total operating revenues	6,951	6,721	18,859	18,091
Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6,560	6,378	17,142	16,538
Total operating revenues	6,560	6,371	17,161	16,571
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,955	2,936	7,753	7,451
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,873	1,804	4,805	4,691
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	861	797	2,228	2,148
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	619	603	1,644	1,535
Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	252	238	712	713
Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	270	216	1,330	1,089
Total operating revenues	266	217	1,323	1,122
Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	129	112	747	631
Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	78	64	373	308
Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	30	24	110	92
Gas Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	33	16	100	58
Commercial Renewables
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	56	57	163	170
Total operating revenues	117	126	355	378
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	8	7	20	20
Total operating revenues	8	7	20	20
Duke Energy Carolinas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,120	2,068	5,474	5,423
Revenue from sources other than contracts with customers	(16)	(10)	(44)	(7)
Total operating revenues	2,104	2,058	5,430	5,416
Duke Energy Carolinas | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,120	2,068	5,474	5,423
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	892	883	2,368	2,316
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	685	664	1,685	1,720
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	360	342	872	871
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	111	117	341	332
Duke Energy Carolinas | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	72	62	208	184
Progress Energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,212	3,179	8,338	8,039
Revenue from sources other than contracts with customers	21	18	79	78
Total operating revenues	3,233	3,197	8,417	8,117
Progress Energy | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,212	3,179	8,338	8,039
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,525	1,550	3,903	3,792
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	826	805	2,170	2,080
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	264	245	700	673
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	399	412	1,056	1,018
Progress Energy | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	198	167	509	476
Duke Energy Progress
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,656	1,612	4,366	4,151
Revenue from sources other than contracts with customers	11	14	51	56
Total operating revenues	1,667	1,626	4,417	4,207
Duke Energy Progress | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,656	1,612	4,366	4,151
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	619	616	1,657	1,578
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	400	384	1,036	1,001
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	195	179	500	487
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	324	358	901	877
Duke Energy Progress | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	118	75	272	208
Duke Energy Florida
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,556	1,567	3,972	3,888
Revenue from sources other than contracts with customers	5		15	9
Total operating revenues	1,561	1,567	3,987	3,897
Duke Energy Florida | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,556	1,567	3,972	3,888
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	906	934	2,246	2,214
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	426	421	1,134	1,079
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	69	66	200	186
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	75	54	155	141
Duke Energy Florida | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	80	92	237	268
Duke Energy Ohio
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	506	481	1,498	1,405
Revenue from sources other than contracts with customers		(8)	(4)	(11)
Total operating revenues	506	473	1,494	1,394
Duke Energy Ohio | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	413	400	1,123	1,081
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	223	213	589	558
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	119	119	329	336
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	35	35	99	103
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	19	10	45	22
Duke Energy Ohio | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	17	23	61	62
Duke Energy Ohio | Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	93	81	375	324
Duke Energy Ohio | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	62	55	241	214
Duke Energy Ohio | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	24	20	99	86
Duke Energy Ohio | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3	3	14	12
Duke Energy Ohio | Gas Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4	3	21	12
Duke Energy Indiana
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	870	762	2,337	2,067
Revenue from sources other than contracts with customers	16	(1)	29	3
Total operating revenues	886	761	2,366	2,070
Duke Energy Indiana | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	870	762	2,337	2,067
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	316	289	894	785
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	240	212	619	554
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	202	175	558	502
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	89	64	202	163
Duke Energy Indiana | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	23	22	64	63
Piedmont
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	182	144	977	792
Revenue from sources other than contracts with customers	13	18	39	79
Total operating revenues	195	162	1,016	871
Piedmont | Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	182	144	977	792
Piedmont | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	66	57	505	417
Piedmont | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	58	44	273	222
Piedmont | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	26	22	96	80
Piedmont | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Power Generation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	23	10	69	27
Piedmont | Gas Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 9	$ 11	$ 34	$ 46

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Revenue (Reserve for Credit Losses for Trade and Other Receivables) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 123	$ 102	$ 146	$ 76
Cumulative Change in Accounting Principle	123	133	123	133
Write-Offs	(13)	12	(39)	(7)
Credit Loss Expense	11	(9)	40	24
Other Adjustments	2	28	(24)	35
Ending balance	123	133	123	133
Duke Energy Carolinas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	42	14	23	10
Cumulative Change in Accounting Principle	42	22	42	22
Write-Offs	(3)	(2)	(10)	(8)
Credit Loss Expense	4		20	9
Other Adjustments	(1)	10	9	10
Ending balance	42	22	42	22
Progress Energy
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	36	29	37	16
Cumulative Change in Accounting Principle	36	37	36	37
Write-Offs	(6)	15	(20)	8
Credit Loss Expense	6	(16)	19	2
Other Adjustments		9		9
Ending balance	36	37	36	37
Duke Energy Progress
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	21	14	23	8
Cumulative Change in Accounting Principle	21	21	21	21
Write-Offs	(3)	13	(11)	8
Credit Loss Expense	3	(15)	9	(5)
Other Adjustments		9		9
Ending balance	21	21	21	21
Duke Energy Florida
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	16	14	14	7
Cumulative Change in Accounting Principle	16	16	16	16
Write-Offs	(3)	2	(9)
Credit Loss Expense	3		10	8
Other Adjustments			1
Ending balance	16	16	16	16
Duke Energy Ohio
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4	5	4	4
Cumulative Change in Accounting Principle	4	5	4	5
Credit Loss Expense				1
Ending balance	4	5	4	5
Duke Energy Indiana
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3	3	3	3
Cumulative Change in Accounting Principle	3	3	3	3
Ending balance	3	3	3	3
Piedmont
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	13	6	12	6
Cumulative Change in Accounting Principle	15	9	15	9
Write-Offs	(4)		(7)	(5)
Credit Loss Expense	2	3	6	7
Other Adjustments	4		4
Ending balance	$ 15	$ 9	$ 15	9
Cumulative Change in Accounting Principle
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				5
Cumulative Change in Accounting Principle
Cumulative Change in Accounting Principle | Duke Energy Carolinas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				1
Cumulative Change in Accounting Principle
Cumulative Change in Accounting Principle | Progress Energy
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				2
Cumulative Change in Accounting Principle
Cumulative Change in Accounting Principle | Duke Energy Progress
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				1
Cumulative Change in Accounting Principle
Cumulative Change in Accounting Principle | Duke Energy Florida
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				1
Cumulative Change in Accounting Principle
Cumulative Change in Accounting Principle | Piedmont
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				$ 1
Cumulative Change in Accounting Principle

XML

Revenue (Aging of Trade Receivables) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	$ 826	$ 969
Trade and Other Receivables, not past due	2,201	1,789
Deferred Payment Arrangements	113	215
Trade and Other Receivables	3,552	3,299
30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	194	185
60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	57	22
90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	161	119
Duke Energy Carolinas
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	308	328
Trade and Other Receivables, not past due	689	445
Deferred Payment Arrangements	66	96
Trade and Other Receivables	1,235	966
Duke Energy Carolinas | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	74	80
Duke Energy Carolinas | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	30	1
Duke Energy Carolinas | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	68	16
Progress Energy
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	242	283
Trade and Other Receivables, not past due	910	707
Deferred Payment Arrangements	29	80
Trade and Other Receivables	1,285	1,166
Progress Energy | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	63	54
Progress Energy | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	14	10
Progress Energy | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	27	32
Duke Energy Progress
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	125	167
Trade and Other Receivables, not past due	521	398
Deferred Payment Arrangements	21	52
Trade and Other Receivables	715	655
Duke Energy Progress | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	37	25
Duke Energy Progress | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	6	4
Duke Energy Progress | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	5	9
Duke Energy Florida
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	117	116
Trade and Other Receivables, not past due	388	307
Deferred Payment Arrangements	8	28
Trade and Other Receivables	569	509
Duke Energy Florida | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	26	29
Duke Energy Florida | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	8	6
Duke Energy Florida | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	22	23
Duke Energy Ohio
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	5	2
Trade and Other Receivables, not past due	65	60
Deferred Payment Arrangements	2
Trade and Other Receivables	111	102
Duke Energy Ohio | CRC
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	64	87
Duke Energy Ohio | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	7	8
Duke Energy Ohio | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	1	2
Duke Energy Ohio | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	31	30
Duke Energy Indiana
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	27	16
Trade and Other Receivables, not past due	41	26
Trade and Other Receivables	84	58
Duke Energy Indiana | CRC
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	115	134
Duke Energy Indiana | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	5	3
Duke Energy Indiana | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	1	1
Duke Energy Indiana | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	10	12
Piedmont
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	7	86
Trade and Other Receivables, not past due	80	149
Deferred Payment Arrangements	6	7
Trade and Other Receivables	111	262
Piedmont | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	6	8
Piedmont | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	3	3
Piedmont | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	$ 9	$ 9

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Stockholders' Equity (Earnings Per Share Data) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Class of Stock [Line Items]
Net income available to Duke Energy common stockholders	$ 1,366	$ 1,265	$ 3,070	$ 1,347
Accumulated preferred stock dividends adjustment	12	12	12	13
Less: Impact of participating securities	1	1	3	2
Income from continuing operations available to Duke Energy common stockholders	$ 1,377	$ 1,276	$ 3,079	$ 1,358
Weighted average common shares outstanding – basic (in shares)	769	735	769	735
Diluted (in shares)	769	735	769	735
EPS available to Duke Energy common stockholders
Basic (in usd per share)	$ 1.79	$ 1.74	$ 4.00	$ 1.85
Diluted (in usd per share)	$ 1.79	$ 1.74	$ 4.00	$ 1.85
Potentially dilutive items excluded from the calculation (in shares)	2	2	2	2
Common Stock
EPS available to Duke Energy common stockholders
Dividends declared per common share (in usd per share)	$ 0.985	$ 0.965	$ 2.915	$ 2.855
Preferred stock, Series A
EPS available to Duke Energy common stockholders
Dividends declared on preferred stock per depositary share (in usd per share)	0.359	0.359	$ 1.078	1.078
Cumulative dividend rate per annum			5.75%
Liquidation preference per share (in usd per share)	25		$ 25
Preferred stock, Series B
EPS available to Duke Energy common stockholders
Dividends declared on preferred stock per depositary share (in usd per share)	24.375	$ 24.375	$ 48.750	$ 49.292
Cumulative dividend rate per annum			4.875%
Liquidation preference per share (in usd per share)	$ 1,000		$ 1,000

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Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - Qualified Pension Plans - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 43	$ 41	$ 131	$ 124
Interest cost on projected benefit obligation	55	67	165	202
Expected return on plan assets	(139)	(143)	(418)	(429)
Amortization of actuarial loss	33	32	100	96
Amortization of prior service credit	(7)	(8)	(22)	(24)
Amortization of settlement charges	2	11	6	16
Net periodic pension costs	(13)		(38)	(15)
Duke Energy Carolinas
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	14	12	42	38
Interest cost on projected benefit obligation	13	16	38	47
Expected return on plan assets	(36)	(36)	(106)	(108)
Amortization of actuarial loss	7	7	22	21
Amortization of prior service credit	(2)	(2)	(6)	(6)
Amortization of settlement charges	1	6	4	8
Net periodic pension costs	(3)	3	(6)	0
Progress Energy
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	13	12	38	36
Interest cost on projected benefit obligation	17	21	52	64
Expected return on plan assets	(47)	(48)	(141)	(143)
Amortization of actuarial loss	10	10	29	30
Amortization of prior service credit	(1)		(2)	(2)
Amortization of settlement charges	1	5	2	6
Net periodic pension costs	(7)		(22)	(9)
Duke Energy Progress
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	7	6	22	20
Interest cost on projected benefit obligation	8	10	23	29
Expected return on plan assets	(21)	(22)	(63)	(66)
Amortization of actuarial loss	5	4	14	13
Amortization of prior service credit			(1)	(1)
Amortization of settlement charges		5	1	6
Net periodic pension costs	(1)	3	(4)	1
Duke Energy Florida
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	5	5	16	16
Interest cost on projected benefit obligation	10	12	29	35
Expected return on plan assets	(25)	(25)	(76)	(76)
Amortization of actuarial loss	5	6	15	17
Amortization of prior service credit	(1)		(1)	(1)
Amortization of settlement charges		1		1
Net periodic pension costs	(6)	(1)	(17)	(8)
Duke Energy Ohio
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	2	1	4	3
Interest cost on projected benefit obligation	2	4	9	12
Expected return on plan assets	(7)	(7)	(21)	(21)
Amortization of actuarial loss	2	2	5	5
Net periodic pension costs	(1)		(3)	(1)
Duke Energy Indiana
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	2	2	7	6
Interest cost on projected benefit obligation	5	6	14	17
Expected return on plan assets	(10)	(11)	(30)	(32)
Amortization of actuarial loss	3	3	10	9
Amortization of prior service credit			(1)	(1)
Amortization of settlement charges		1		1
Net periodic pension costs		1
Piedmont
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	1	4	4
Interest cost on projected benefit obligation	2	2	6	7
Expected return on plan assets	(5)	(5)	(15)	(16)
Amortization of actuarial loss	2	2	7	7
Amortization of prior service credit	(1)	(2)	(6)	(7)
Amortization of settlement charges	$ 1	1	1	1
Net periodic pension costs		$ (1)	$ (3)	$ (4)

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Income Taxes (Effective Tax Rates) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Effective tax rate	6.60%	7.80%	6.70%	(6.40%)
Duke Energy Carolinas
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Effective tax rate	2.90%	12.00%	3.60%	13.60%
Progress Energy
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Effective tax rate	12.90%	10.40%	11.50%	13.40%
Duke Energy Progress
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Effective tax rate	6.30%	3.10%	5.90%	10.00%
Duke Energy Florida
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Effective tax rate	19.10%	21.40%	19.10%	20.30%
Duke Energy Ohio
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Effective tax rate	13.40%	16.70%	15.30%	16.60%
Duke Energy Indiana
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Effective tax rate	15.80%	19.60%	16.30%	19.40%
Piedmont
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Effective tax rate	25.00%	16.70%	8.40%	3.70%