Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2020

Public Utilities, General Disclosures [Line Items]

Schedule of Regulatory Assets

The following tables present the regulatory assets and liabilities recorded on the Consolidated Balance Sheets of Duke Energy and Progress Energy. See separate tables below for balances by individual registrant.

	Duke Energy				Progress Energy
	December 31,				December 31,
(in millions)	2020		2019		2020		2019
Regulatory Assets
AROs – coal ash	$	3,408	$	4,084	$	1,357	$	1,843
AROs – nuclear and other	754		739		685		668
Accrued pension and OPEB	2,317		2,391		875		897
Storm cost deferrals	1,102		1,399		893		1,214
Nuclear asset securitized balance, net	991		1,042		991		1,042
Debt fair value adjustment	950		1,019		—		—
Retired generation facilities	417		331		363		266
Post-in-service carrying costs (PISCC) and deferred operating expenses	402		329		51		33
Deferred asset – Lee and Harris COLA	356		388		32		38
Hedge costs deferrals	351		356		148		129
Advanced metering infrastructure (AMI)	311		338		102		114
Demand side management (DSM)/Energy Efficiency (EE)	288		343		241		241
Vacation accrual	221		214		42		41
Deferred fuel and purchased power	213		528		162		305
COR settlement	128		133		33		35
NCEMPA deferrals	124		72		124		72
Nuclear deferral	123		107		35		40
Derivatives – natural gas supply contracts	122		117		—		—
CEP deferral	117		76		—		—
Amounts due from customers	110		36		—		—
Qualifying facility contract buyouts	107		121		107		121
Customer connect project	105		65		55		37
Manufactured gas plant (MGP)	104		102		—		—
ABSAT, coal ash basin closure	98		65		27		15
Deferred pipeline integrity costs	92		79		—		—
Deferred severance charges	86		—		29		—
Incremental COVID-19 expenses	76		—		23		—
Other	589		544		158		141
Total regulatory assets	14,062		15,018		6,533		7,292
Less: current portion	1,641		1,796		758		946
Total noncurrent regulatory assets	$	12,421	$	13,222	$	5,775	$	6,346
Regulatory Liabilities
Net regulatory liability related to income taxes	$	7,368	$	7,872	$	2,411	$	2,595
Costs of removal	5,883		5,756		2,666		2,561
AROs – nuclear and other	1,512		1,100		—		—
Provision for rate refunds	344		370		123		123
Accrued pension and OPEB	177		176		—		—
Amounts to be refunded to customers	51		34		—		—
Deferred fuel and purchased power	18		1		—		1
Other	1,053		739		491		275
Total regulatory liabilities	16,406		16,048		5,691		5,555
Less: current portion	1,377		784		640		330
Total noncurrent regulatory liabilities	$	15,029	$	15,264	$	5,051	$	5,225

Schedule Of Regulatory Liabilities

The following tables present the regulatory assets and liabilities recorded on the Consolidated Balance Sheets of Duke Energy and Progress Energy. See separate tables below for balances by individual registrant.

	Duke Energy				Progress Energy
	December 31,				December 31,
(in millions)	2020		2019		2020		2019
Regulatory Assets
AROs – coal ash	$	3,408	$	4,084	$	1,357	$	1,843
AROs – nuclear and other	754		739		685		668
Accrued pension and OPEB	2,317		2,391		875		897
Storm cost deferrals	1,102		1,399		893		1,214
Nuclear asset securitized balance, net	991		1,042		991		1,042
Debt fair value adjustment	950		1,019		—		—
Retired generation facilities	417		331		363		266
Post-in-service carrying costs (PISCC) and deferred operating expenses	402		329		51		33
Deferred asset – Lee and Harris COLA	356		388		32		38
Hedge costs deferrals	351		356		148		129
Advanced metering infrastructure (AMI)	311		338		102		114
Demand side management (DSM)/Energy Efficiency (EE)	288		343		241		241
Vacation accrual	221		214		42		41
Deferred fuel and purchased power	213		528		162		305
COR settlement	128		133		33		35
NCEMPA deferrals	124		72		124		72
Nuclear deferral	123		107		35		40
Derivatives – natural gas supply contracts	122		117		—		—
CEP deferral	117		76		—		—
Amounts due from customers	110		36		—		—
Qualifying facility contract buyouts	107		121		107		121
Customer connect project	105		65		55		37
Manufactured gas plant (MGP)	104		102		—		—
ABSAT, coal ash basin closure	98		65		27		15
Deferred pipeline integrity costs	92		79		—		—
Deferred severance charges	86		—		29		—
Incremental COVID-19 expenses	76		—		23		—
Other	589		544		158		141
Total regulatory assets	14,062		15,018		6,533		7,292
Less: current portion	1,641		1,796		758		946
Total noncurrent regulatory assets	$	12,421	$	13,222	$	5,775	$	6,346
Regulatory Liabilities
Net regulatory liability related to income taxes	$	7,368	$	7,872	$	2,411	$	2,595
Costs of removal	5,883		5,756		2,666		2,561
AROs – nuclear and other	1,512		1,100		—		—
Provision for rate refunds	344		370		123		123
Accrued pension and OPEB	177		176		—		—
Amounts to be refunded to customers	51		34		—		—
Deferred fuel and purchased power	18		1		—		1
Other	1,053		739		491		275
Total regulatory liabilities	16,406		16,048		5,691		5,555
Less: current portion	1,377		784		640		330
Total noncurrent regulatory liabilities	$	15,029	$	15,264	$	5,051	$	5,225

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 Consolidated Balance Sheets as of December 31, 2020, and exclude capitalized asset retirement costs.

		Remaining Net
	Capacity	Book Value
	(in MW)	(in millions)
Duke Energy Carolinas
Allen Steam Station Units 1-3(a)	604	$	113
Allen Steam Station Units 4-5(b)	526	338
Cliffside Unit 5(b)	546	350
Duke Energy Progress
Mayo Unit 1(b)	746	676
Roxboro Units 3-4(b)	1,409	484
Duke Energy Florida
Crystal River Units 4-5(c)	1,430	1,696
Duke Energy Indiana
Gallagher Units 2 and 4(d)	280	102
Gibson Units 1-5(e)	2,845	1,866
Cayuga Units 1-2(e)	1,005	777
Total Duke Energy	9,391	$	6,402

(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, is expected to be retired in March 2021.

(b)    These units are 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. A decision by NCUC is expected by the end of the first quarter 2021.

(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, in support of Duke Energy's carbon reduction goals. A request for the FPSC to hold a hearing has been made and a decision by the FPSC is expected in the second quarter 2021.

(d)    Duke Energy Indiana committed to either retire or stop burning coal at Gallagher Units 2 and 4 by December 31, 2022, as part of the 2016 settlement of Edwardsport IGCC matters. In February 2021, upon approval by MISO of a new retirement date, Duke Energy Indiana determined it would modify the retirement date to June 1, 2021.

(e)    On July 1, 2019, Duke Energy Indiana filed its 2018 IRP with the IURC. The 2018 IRP included scenarios evaluating the potential retirement of coal-fired generating units at Gibson and Cayuga. 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.

Duke Energy Carolinas

Public Utilities, General Disclosures [Line Items]

Schedule of Regulatory Assets

The following tables present the regulatory assets and liabilities recorded on Duke Energy Carolinas' Consolidated Balance Sheets.

	December 31,				Earns/Pays	Recovery/Refund
(in millions)	2020		2019		a Return	Period Ends
Regulatory Assets(a)
AROs – coal ash	$	1,414	$	1,696	(h)	(b)
Accrued pension and OPEB(c)	427		477		Yes	(i)
Storm cost deferrals	205		178		Yes	(b)
Retired generation facilities(c)	11		16		Yes	2023
PISCC(c)	32		33		Yes	(b)
Deferred asset – Lee COLA	324		350			(b)
Hedge costs deferrals(c)	174		198		Yes	2041
AMI	154		166		Yes	(b)
DSM/EE	46		100		(g)	(g)
Vacation accrual	84		80			2021
Deferred fuel and purchased power	42		222		(e)	2022
COR settlement	95		98		Yes	(b)
Nuclear deferral	88		67			2022
Customer connect project	50		28		Yes	(b)
ABSAT, coal ash basin closure	71		50		Yes	(b)
Deferred severance charges	57		—			2022
Incremental COVID-19 expenses	31		—		Yes	(b)
Other	164		151			(b)
Total regulatory assets	3,469		3,910
Less: current portion	473		550
Total noncurrent regulatory assets	$	2,996	$	3,360
Regulatory Liabilities(a)
Net regulatory liability related to income taxes(d)	$	2,874	$	3,060		(b)
Costs of removal(c)	1,975		1,936		Yes	(f)
AROs – nuclear and other	1,512		1,100			(b)
Provision for rate refunds(c)	170		175		Yes
Accrued pension and OPEB(c)	32		39		Yes	(i)
Deferred fuel and purchased power	18		—		(e)	2020
Other	427		368			(b)
Total regulatory liabilities	7,008		6,678
Less: current portion	473		255
Total noncurrent regulatory liabilities	$	6,535	$	6,423

(a)    Regulatory assets and liabilities are excluded from rate base unless otherwise noted.

(b)    The expected recovery or refund period varies or has not been determined.

(c)     Included in rate base.

(d)    Includes regulatory liabilities related to the change in the federal tax rate as a result of the Tax Act and the change in the North Carolina tax rate, both discussed in Note 23. Portions are included in rate base.

(e)    Pays interest on over-recovered costs in North Carolina. Includes certain purchased power costs in North Carolina and South Carolina and costs of distributed energy in South Carolina.

(f)    Recovered over the life of the associated assets.

(g)    Includes incentives on DSM/EE investments and is recovered through an annual rider mechanism.

(h)    Earns a debt and equity return on coal ash expenditures for North Carolina and South Carolina retail customers as permitted by various regulatory orders.

(i)    Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail.

Schedule Of Regulatory Liabilities

The following tables present the regulatory assets and liabilities recorded on Duke Energy Carolinas' Consolidated Balance Sheets.

	December 31,				Earns/Pays	Recovery/Refund
(in millions)	2020		2019		a Return	Period Ends
Regulatory Assets(a)
AROs – coal ash	$	1,414	$	1,696	(h)	(b)
Accrued pension and OPEB(c)	427		477		Yes	(i)
Storm cost deferrals	205		178		Yes	(b)
Retired generation facilities(c)	11		16		Yes	2023
PISCC(c)	32		33		Yes	(b)
Deferred asset – Lee COLA	324		350			(b)
Hedge costs deferrals(c)	174		198		Yes	2041
AMI	154		166		Yes	(b)
DSM/EE	46		100		(g)	(g)
Vacation accrual	84		80			2021
Deferred fuel and purchased power	42		222		(e)	2022
COR settlement	95		98		Yes	(b)
Nuclear deferral	88		67			2022
Customer connect project	50		28		Yes	(b)
ABSAT, coal ash basin closure	71		50		Yes	(b)
Deferred severance charges	57		—			2022
Incremental COVID-19 expenses	31		—		Yes	(b)
Other	164		151			(b)
Total regulatory assets	3,469		3,910
Less: current portion	473		550
Total noncurrent regulatory assets	$	2,996	$	3,360
Regulatory Liabilities(a)
Net regulatory liability related to income taxes(d)	$	2,874	$	3,060		(b)
Costs of removal(c)	1,975		1,936		Yes	(f)
AROs – nuclear and other	1,512		1,100			(b)
Provision for rate refunds(c)	170		175		Yes
Accrued pension and OPEB(c)	32		39		Yes	(i)
Deferred fuel and purchased power	18		—		(e)	2020
Other	427		368			(b)
Total regulatory liabilities	7,008		6,678
Less: current portion	473		255
Total noncurrent regulatory liabilities	$	6,535	$	6,423

(a)    Regulatory assets and liabilities are excluded from rate base unless otherwise noted.

(b)    The expected recovery or refund period varies or has not been determined.

(c)     Included in rate base.

(d)    Includes regulatory liabilities related to the change in the federal tax rate as a result of the Tax Act and the change in the North Carolina tax rate, both discussed in Note 23. Portions are included in rate base.

(e)    Pays interest on over-recovered costs in North Carolina. Includes certain purchased power costs in North Carolina and South Carolina and costs of distributed energy in South Carolina.

(f)    Recovered over the life of the associated assets.

(g)    Includes incentives on DSM/EE investments and is recovered through an annual rider mechanism.

(h)    Earns a debt and equity return on coal ash expenditures for North Carolina and South Carolina retail customers as permitted by various regulatory orders.

(i)    Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail.

Duke Energy Progress

Public Utilities, General Disclosures [Line Items]

Schedule of Regulatory Assets

The following tables present the regulatory assets and liabilities recorded on Duke Energy Progress' Consolidated Balance Sheets.

	December 31,				Earns/Pays	Recovery/Refund
(in millions)	2020		2019		a Return	Period Ends
Regulatory Assets(a)
AROs – coal ash	$	1,347	$	1,834	(h)	(b)
AROs – nuclear and other	683		509			(c)
Accrued pension and OPEB	393		423			(k)
Storm cost deferrals(d)	785		801		Yes	(b)
Retired generation facilities	189		83		Yes	(b)
PISCC and deferred operating expenses	51		33		Yes	2054
Deferred asset – Harris COLA	32		38			(b)
Hedge costs deferrals	89		85			(b)
AMI	57		61		Yes	(b)
DSM/EE(e)	224		216		(i)	(i)
Vacation accrual	42		41			2021
Deferred fuel and purchased power	158		266		(f)	2022
COR settlement	33		35		Yes	(e)
NCEMPA deferrals	124		72		(g)	2042
Nuclear deferral	35		40			2022
Customer connect project	25		17		Yes	(b)
ABSAT, coal ash basin closure	27		15		Yes	(b)
Deferred severance charges	29		—			2022
Incremental COVID-19 expenses	23		—		Yes	(b)
Other	122		109			(b)
Total regulatory assets	4,468		4,678
Less: current portion	492		526
Total noncurrent regulatory assets	$	3,976	$	4,152
Regulatory Liabilities(a)
Net regulatory liability related to income taxes(l)	$	1,662	$	1,802		(b)
Costs of removal	2,666		2,294		Yes	(j)
Provision for rate refunds	123		123		Yes
Other	473		249			(b)
Total regulatory liabilities	4,924		4,468
Less: current portion	530		236
Total noncurrent regulatory liabilities	$	4,394	$	4,232

(a)    Regulatory assets and liabilities are excluded from rate base unless otherwise noted.

(b)    The expected recovery or refund period varies or has not been determined.

(c)    Recovery period for costs related to nuclear facilities runs through the decommissioning period of each unit.

(d)    South Carolina storm costs are included in rate base.

(e)    Included in rate base.

(f)    Pays interest on over-recovered costs in North Carolina. Includes certain purchased power costs in North Carolina and South Carolina and costs of distributed energy in South Carolina.

(g)    South Carolina retail allocated costs are earning a return.

(h)    Earns a debt and equity return on coal ash expenditures for North Carolina and South Carolina retail customers as permitted by various regulatory orders.

(i)    Includes incentives on DSM/EE investments and is recovered through an annual rider mechanism.

(j)    Recovered over the life of the associated assets.

(k)    Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail.

(l)    Includes regulatory liabilities related to the change in the federal tax rate as a result of the Tax Act and the change in the North Carolina tax rate, both discussed in Note 23. Portions are included in rate base.

Schedule Of Regulatory Liabilities

The following tables present the regulatory assets and liabilities recorded on Duke Energy Progress' Consolidated Balance Sheets.

	December 31,				Earns/Pays	Recovery/Refund
(in millions)	2020		2019		a Return	Period Ends
Regulatory Assets(a)
AROs – coal ash	$	1,347	$	1,834	(h)	(b)
AROs – nuclear and other	683		509			(c)
Accrued pension and OPEB	393		423			(k)
Storm cost deferrals(d)	785		801		Yes	(b)
Retired generation facilities	189		83		Yes	(b)
PISCC and deferred operating expenses	51		33		Yes	2054
Deferred asset – Harris COLA	32		38			(b)
Hedge costs deferrals	89		85			(b)
AMI	57		61		Yes	(b)
DSM/EE(e)	224		216		(i)	(i)
Vacation accrual	42		41			2021
Deferred fuel and purchased power	158		266		(f)	2022
COR settlement	33		35		Yes	(e)
NCEMPA deferrals	124		72		(g)	2042
Nuclear deferral	35		40			2022
Customer connect project	25		17		Yes	(b)
ABSAT, coal ash basin closure	27		15		Yes	(b)
Deferred severance charges	29		—			2022
Incremental COVID-19 expenses	23		—		Yes	(b)
Other	122		109			(b)
Total regulatory assets	4,468		4,678
Less: current portion	492		526
Total noncurrent regulatory assets	$	3,976	$	4,152
Regulatory Liabilities(a)
Net regulatory liability related to income taxes(l)	$	1,662	$	1,802		(b)
Costs of removal	2,666		2,294		Yes	(j)
Provision for rate refunds	123		123		Yes
Other	473		249			(b)
Total regulatory liabilities	4,924		4,468
Less: current portion	530		236
Total noncurrent regulatory liabilities	$	4,394	$	4,232

(a)    Regulatory assets and liabilities are excluded from rate base unless otherwise noted.

(b)    The expected recovery or refund period varies or has not been determined.

(c)    Recovery period for costs related to nuclear facilities runs through the decommissioning period of each unit.

(d)    South Carolina storm costs are included in rate base.

(e)    Included in rate base.

(f)    Pays interest on over-recovered costs in North Carolina. Includes certain purchased power costs in North Carolina and South Carolina and costs of distributed energy in South Carolina.

(g)    South Carolina retail allocated costs are earning a return.

(h)    Earns a debt and equity return on coal ash expenditures for North Carolina and South Carolina retail customers as permitted by various regulatory orders.

(i)    Includes incentives on DSM/EE investments and is recovered through an annual rider mechanism.

(j)    Recovered over the life of the associated assets.

(k)    Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail.

(l)    Includes regulatory liabilities related to the change in the federal tax rate as a result of the Tax Act and the change in the North Carolina tax rate, both discussed in Note 23. Portions are included in rate base.

Duke Energy Florida

Public Utilities, General Disclosures [Line Items]

Schedule of Regulatory Assets

The following tables present the regulatory assets and liabilities recorded on Duke Energy Florida's Consolidated Balance Sheets.

	December 31,				Earns/Pays	Recovery/Refund
(in millions)	2020		2019		a Return	Period Ends
Regulatory Assets(a)
AROs – coal ash(c)	$	10	$	9		(b)
AROs – nuclear and other(c)	2		159		Yes	(b)
Accrued pension and OPEB(c)	482		474		Yes	(g)
Storm cost deferrals(c)	108		413		(e)	(b)
Nuclear asset securitized balance, net	991		1,042			2036
Retired generation facilities(c)	174		183		Yes	(b)
Hedge costs deferrals	59		44		Yes	2038
AMI(c)	45		53		Yes	2032
DSM/EE(c)	17		25		Yes	2025
Deferred fuel and purchased power	4		39		(f)	2022
Qualifying facility contract buyouts	107		121		Yes	2034
Customer connect project	30		20			2037
Other	35		31		(d)	(b)
Total regulatory assets	2,064		2,613
Less: current portion	265		419
Total noncurrent regulatory assets	$	1,799	$	2,194
Regulatory Liabilities(a)
Net regulatory liability related to income taxes(c)	$	749	$	793		(b)
Costs of removal(c)	—		267		(d)	(b)
Deferred fuel and purchased power(c)	—		1		(f)
Other	19		26		(d)	(b)
Total regulatory liabilities	768		1,087
Less: current portion	110		94
Total noncurrent regulatory liabilities	$	658	$	993

(a)    Regulatory assets and liabilities are excluded from rate base unless otherwise noted.

(b)    The expected recovery or refund period varies or has not been determined.

(c)    Included in rate base.

(d)    Certain costs earn/pay a return.

(e)    Earns a debt return/interest once collections begin.

(f)    Earns commercial paper rate.

(g)    Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail.

Schedule Of Regulatory Liabilities

The following tables present the regulatory assets and liabilities recorded on Duke Energy Florida's Consolidated Balance Sheets.

	December 31,				Earns/Pays	Recovery/Refund
(in millions)	2020		2019		a Return	Period Ends
Regulatory Assets(a)
AROs – coal ash(c)	$	10	$	9		(b)
AROs – nuclear and other(c)	2		159		Yes	(b)
Accrued pension and OPEB(c)	482		474		Yes	(g)
Storm cost deferrals(c)	108		413		(e)	(b)
Nuclear asset securitized balance, net	991		1,042			2036
Retired generation facilities(c)	174		183		Yes	(b)
Hedge costs deferrals	59		44		Yes	2038
AMI(c)	45		53		Yes	2032
DSM/EE(c)	17		25		Yes	2025
Deferred fuel and purchased power	4		39		(f)	2022
Qualifying facility contract buyouts	107		121		Yes	2034
Customer connect project	30		20			2037
Other	35		31		(d)	(b)
Total regulatory assets	2,064		2,613
Less: current portion	265		419
Total noncurrent regulatory assets	$	1,799	$	2,194
Regulatory Liabilities(a)
Net regulatory liability related to income taxes(c)	$	749	$	793		(b)
Costs of removal(c)	—		267		(d)	(b)
Deferred fuel and purchased power(c)	—		1		(f)
Other	19		26		(d)	(b)
Total regulatory liabilities	768		1,087
Less: current portion	110		94
Total noncurrent regulatory liabilities	$	658	$	993

(a)    Regulatory assets and liabilities are excluded from rate base unless otherwise noted.

(b)    The expected recovery or refund period varies or has not been determined.

(c)    Included in rate base.

(d)    Certain costs earn/pay a return.

(e)    Earns a debt return/interest once collections begin.

(f)    Earns commercial paper rate.

(g)    Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail.

Duke Energy Ohio

Public Utilities, General Disclosures [Line Items]

Schedule of Regulatory Assets

The following tables present the regulatory assets and liabilities recorded on Duke Energy Ohio's Consolidated Balance Sheets.

	December 31,				Earns/Pays	Recovery/Refund
(in millions)	2020		2019		a Return	Period Ends
Regulatory Assets(a)
AROs – coal ash	$	22	$	16	Yes	(b)
Accrued pension and OPEB	149		155			(g)
Storm cost deferrals	4		7			2023
PISCC and deferred operating expenses(c)	16		17		Yes	2083
Hedge costs deferrals	7		6			(b)
AMI	36		40			(b)
DSM/EE	1		2		(f)	(e)
Vacation accrual	6		5			2021
Deferred fuel and purchased power	—		1			2021
CEP deferral	117		76		Yes	(b)
MGP	104		102			(b)
Deferred pipeline integrity costs	21		17		Yes	(b)
Other	166		154			(b)
Total regulatory assets	649		598
Less: current portion	39		49
Total noncurrent regulatory assets	$	610	$	549
Regulatory Liabilities(a)
Net regulatory liability related to income taxes	$	628	$	654		(b)
Costs of removal	68		86			(d)
Provision for rate refunds	45		31			(b)
Accrued pension and OPEB	17		16			(g)
Other	55		40			(b)
Total regulatory liabilities	813		827
Less: current portion	65		64
Total noncurrent regulatory liabilities	$	748	$	763

(a)    Regulatory assets and liabilities are excluded from rate base unless otherwise noted.

(b)    The expected recovery or refund period varies or has not been determined.

(c)    Included in rate base.

(d)    Recovery over the life of the associated assets.

(e)    Recovered via a rider mechanism.

(f)    Includes incentives on DSM/EE investments.

(g)    Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail.

Schedule Of Regulatory Liabilities

The following tables present the regulatory assets and liabilities recorded on Duke Energy Ohio's Consolidated Balance Sheets.

	December 31,				Earns/Pays	Recovery/Refund
(in millions)	2020		2019		a Return	Period Ends
Regulatory Assets(a)
AROs – coal ash	$	22	$	16	Yes	(b)
Accrued pension and OPEB	149		155			(g)
Storm cost deferrals	4		7			2023
PISCC and deferred operating expenses(c)	16		17		Yes	2083
Hedge costs deferrals	7		6			(b)
AMI	36		40			(b)
DSM/EE	1		2		(f)	(e)
Vacation accrual	6		5			2021
Deferred fuel and purchased power	—		1			2021
CEP deferral	117		76		Yes	(b)
MGP	104		102			(b)
Deferred pipeline integrity costs	21		17		Yes	(b)
Other	166		154			(b)
Total regulatory assets	649		598
Less: current portion	39		49
Total noncurrent regulatory assets	$	610	$	549
Regulatory Liabilities(a)
Net regulatory liability related to income taxes	$	628	$	654		(b)
Costs of removal	68		86			(d)
Provision for rate refunds	45		31			(b)
Accrued pension and OPEB	17		16			(g)
Other	55		40			(b)
Total regulatory liabilities	813		827
Less: current portion	65		64
Total noncurrent regulatory liabilities	$	748	$	763

(a)    Regulatory assets and liabilities are excluded from rate base unless otherwise noted.

(b)    The expected recovery or refund period varies or has not been determined.

(c)    Included in rate base.

(d)    Recovery over the life of the associated assets.

(e)    Recovered via a rider mechanism.

(f)    Includes incentives on DSM/EE investments.

(g)    Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail.

Schedule of MISO Exit Fee Obligations

The following table provides a reconciliation of the beginning and ending balance of Duke Energy Ohio’s recorded liability for its exit obligation and share of MTEP costs recorded in Other within Current Liabilities and Other Noncurrent Liabilities on the Consolidated Balance Sheets. The retail portions of MTEP costs billed by MISO are recovered by Duke Energy Ohio through a non-bypassable rider. As of December 31, 2020, and 2019, $37 million and $40 million, respectively, are recorded in Regulatory assets on Duke Energy Ohio's Consolidated Balance Sheets.

			Provisions/		Cash
(in millions)	December 31, 2019		Adjustments		Reductions		December 31, 2020
Duke Energy Ohio	$	54	$	(1)	$	(3)	$	50

Duke Energy Indiana

Public Utilities, General Disclosures [Line Items]

Schedule of Regulatory Assets

The following tables present the regulatory assets and liabilities recorded on Duke Energy Indiana's Consolidated Balance Sheets.

	December 31,				Earns/Pays	Recovery/Refund
(in millions)	2020		2019		a Return	Period Ends
Regulatory Assets(a)
AROs – coal ash	$	615	$	529	Yes	(b)
Accrued pension and OPEB	245		243			(e)
Retired generation facilities(c)	43		49		Yes	2030
PISCC and deferred operating expenses(c)	303		246		Yes	(b)
Hedge costs deferrals	22		23			(b)
AMI	19		18			2031
Vacation accrual	12		12			2021
Deferred fuel and purchased power	9		—			2021
Other	60		52			(b)
Total regulatory assets	1,328		1,172
Less: current portion	125		90
Total noncurrent regulatory assets	$	1,203	$	1,082
Regulatory Liabilities(a)
Net regulatory liability related to income taxes	$	956	$	1,008		(b)
Costs of removal	599		599			(d)
Accrued pension and OPEB	100		90			(e)
Amounts to be refunded to customers	17		—			(b)
Other	66		43			(b)
Total regulatory liabilities	1,738		1,740
Less: current portion	111		55
Total noncurrent regulatory liabilities	$	1,627	$	1,685

(a)    Regulatory assets and liabilities are excluded from rate base unless otherwise noted.

(b)    The expected recovery or refund period varies or has not been determined.

(c)    Included in rate base.

(d)    Refunded over the life of the associated assets.

(e)    Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail.

Schedule Of Regulatory Liabilities

The following tables present the regulatory assets and liabilities recorded on Duke Energy Indiana's Consolidated Balance Sheets.

	December 31,				Earns/Pays	Recovery/Refund
(in millions)	2020		2019		a Return	Period Ends
Regulatory Assets(a)
AROs – coal ash	$	615	$	529	Yes	(b)
Accrued pension and OPEB	245		243			(e)
Retired generation facilities(c)	43		49		Yes	2030
PISCC and deferred operating expenses(c)	303		246		Yes	(b)
Hedge costs deferrals	22		23			(b)
AMI	19		18			2031
Vacation accrual	12		12			2021
Deferred fuel and purchased power	9		—			2021
Other	60		52			(b)
Total regulatory assets	1,328		1,172
Less: current portion	125		90
Total noncurrent regulatory assets	$	1,203	$	1,082
Regulatory Liabilities(a)
Net regulatory liability related to income taxes	$	956	$	1,008		(b)
Costs of removal	599		599			(d)
Accrued pension and OPEB	100		90			(e)
Amounts to be refunded to customers	17		—			(b)
Other	66		43			(b)
Total regulatory liabilities	1,738		1,740
Less: current portion	111		55
Total noncurrent regulatory liabilities	$	1,627	$	1,685

(a)    Regulatory assets and liabilities are excluded from rate base unless otherwise noted.

(b)    The expected recovery or refund period varies or has not been determined.

(c)    Included in rate base.

(d)    Refunded over the life of the associated assets.

(e)    Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail.

Piedmont

Public Utilities, General Disclosures [Line Items]

Schedule of Regulatory Assets

The following tables present the regulatory assets and liabilities recorded on Piedmont's Consolidated Balance Sheets.

	December 31,				Earns/Pays	Recovery/Refund
(in millions)	2020		2019		a Return	Period Ends
Regulatory Assets(a)
AROs – nuclear and other	$	20	$	16		(d)
Accrued pension and OPEB(c)	88		90			(f)
Vacation accrual	12		12			2021
Derivatives – natural gas supply contracts(e)	122		117
Amounts due from customers	110		36		Yes	(b)
Deferred pipeline integrity costs(c)	71		62			2023
Other	32		30			(b)
Total regulatory assets	455		363
Less: current portion	153		73
Total noncurrent regulatory assets	$	302	$	290
Regulatory Liabilities(a)
Net regulatory liability related to income taxes	$	499	$	555		(b)
Costs of removal	575		574			(d)
Provision for rate refunds	6		41		Yes
Accrued pension and OPEB(c)	3		3			(f)
Amounts to be refunded to customers	34		34		Yes	(b)
Other	15		5			(b)
Total regulatory liabilities	1,132		1,212
Less: current portion	88		81
Total noncurrent regulatory liabilities	$	1,044	$	1,131

(a)    Regulatory assets and liabilities are excluded from rate base unless otherwise noted.

(b)    The expected recovery or refund period varies or has not been determined.

(c)    Included in rate base.

(d)    Recovery over the life of the associated assets.

(e)    Balance will fluctuate with changes in the market. Current contracts extend into 2031.

(f)    Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail.

Schedule Of Regulatory Liabilities

The following tables present the regulatory assets and liabilities recorded on Piedmont's Consolidated Balance Sheets.

	December 31,				Earns/Pays	Recovery/Refund
(in millions)	2020		2019		a Return	Period Ends
Regulatory Assets(a)
AROs – nuclear and other	$	20	$	16		(d)
Accrued pension and OPEB(c)	88		90			(f)
Vacation accrual	12		12			2021
Derivatives – natural gas supply contracts(e)	122		117
Amounts due from customers	110		36		Yes	(b)
Deferred pipeline integrity costs(c)	71		62			2023
Other	32		30			(b)
Total regulatory assets	455		363
Less: current portion	153		73
Total noncurrent regulatory assets	$	302	$	290
Regulatory Liabilities(a)
Net regulatory liability related to income taxes	$	499	$	555		(b)
Costs of removal	575		574			(d)
Provision for rate refunds	6		41		Yes
Accrued pension and OPEB(c)	3		3			(f)
Amounts to be refunded to customers	34		34		Yes	(b)
Other	15		5			(b)
Total regulatory liabilities	1,132		1,212
Less: current portion	88		81
Total noncurrent regulatory liabilities	$	1,044	$	1,131

(a)    Regulatory assets and liabilities are excluded from rate base unless otherwise noted.

(b)    The expected recovery or refund period varies or has not been determined.

(c)    Included in rate base.

(d)    Recovery over the life of the associated assets.

(e)    Balance will fluctuate with changes in the market. Current contracts extend into 2031.

(f)    Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail.