Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2019

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)	2019		2018		2019		2018
Regulatory Assets
AROs – coal ash	$	4,084	$	4,255	$	1,843	$	2,061
AROs – nuclear and other	739		772		668		601
Accrued pension and OPEB	2,391		2,654		897		1,074
Storm cost deferrals	1,399		1,117		1,214		953
Nuclear asset securitized balance, net	1,042		1,093		1,042		1,093
Debt fair value adjustment	1,019		1,099		—		—
Deferred fuel and purchased power	528		838		305		600
Deferred asset – Lee and Harris COLA	388		426		38		43
Hedge costs deferrals	356		204		129		74
Demand side management (DSM)/Energy Efficiency (EE)	343		449		241		256
Advanced metering infrastructure (AMI)	338		367		114		127
Retired generation facilities	331		402		266		324
Post-in-service carrying costs (PISCC) and deferred operating expenses	329		320		33		36
Vacation accrual	214		213		41		41
Derivatives – natural gas supply contracts	117		141		—		—
Nuclear deferral	107		133		40		46
Manufactured gas plant (MGP)	102		99		—		—
Deferred pipeline integrity costs	79		65		—		—
NCEMPA deferrals	72		50		72		50
East Bend deferrals	44		47		—		—
Transmission expansion obligation	36		39		—		—
Amounts due from customers	36		24		—		—
Grid modernization	28		31		—		—
Other	896		784		349		322
Total regulatory assets	15,018		15,622		7,292		7,701
Less: current portion	1,796		2,005		946		1,137
Total noncurrent regulatory assets	$	13,222	$	13,617	$	6,346	$	6,564
Regulatory Liabilities
Net regulatory liability related to income taxes	$	7,872	$	8,058	$	2,595	$	2,710
Costs of removal	5,756		5,421		2,561		2,135
AROs – nuclear and other	1,100		538		—		—
Accrued pension and OPEB	176		301		—		149
Amounts to be refunded to customers	34		34		—		—
Deferred fuel and purchased power	1		16		1		16
Other	1,109		1,064		398		319
Total regulatory liabilities	16,048		15,432		5,555		5,329
Less: current portion	784		598		330		280
Total noncurrent regulatory liabilities	$	15,264	$	14,834	$	5,225	$	5,049

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)	2019		2018		2019		2018
Regulatory Assets
AROs – coal ash	$	4,084	$	4,255	$	1,843	$	2,061
AROs – nuclear and other	739		772		668		601
Accrued pension and OPEB	2,391		2,654		897		1,074
Storm cost deferrals	1,399		1,117		1,214		953
Nuclear asset securitized balance, net	1,042		1,093		1,042		1,093
Debt fair value adjustment	1,019		1,099		—		—
Deferred fuel and purchased power	528		838		305		600
Deferred asset – Lee and Harris COLA	388		426		38		43
Hedge costs deferrals	356		204		129		74
Demand side management (DSM)/Energy Efficiency (EE)	343		449		241		256
Advanced metering infrastructure (AMI)	338		367		114		127
Retired generation facilities	331		402		266		324
Post-in-service carrying costs (PISCC) and deferred operating expenses	329		320		33		36
Vacation accrual	214		213		41		41
Derivatives – natural gas supply contracts	117		141		—		—
Nuclear deferral	107		133		40		46
Manufactured gas plant (MGP)	102		99		—		—
Deferred pipeline integrity costs	79		65		—		—
NCEMPA deferrals	72		50		72		50
East Bend deferrals	44		47		—		—
Transmission expansion obligation	36		39		—		—
Amounts due from customers	36		24		—		—
Grid modernization	28		31		—		—
Other	896		784		349		322
Total regulatory assets	15,018		15,622		7,292		7,701
Less: current portion	1,796		2,005		946		1,137
Total noncurrent regulatory assets	$	13,222	$	13,617	$	6,346	$	6,564
Regulatory Liabilities
Net regulatory liability related to income taxes	$	7,872	$	8,058	$	2,595	$	2,710
Costs of removal	5,756		5,421		2,561		2,135
AROs – nuclear and other	1,100		538		—		—
Accrued pension and OPEB	176		301		—		149
Amounts to be refunded to customers	34		34		—		—
Deferred fuel and purchased power	1		16		1		16
Other	1,109		1,064		398		319
Total regulatory liabilities	16,048		15,432		5,555		5,329
Less: current portion	784		598		330		280
Total noncurrent regulatory liabilities	$	15,264	$	14,834	$	5,225	$	5,049

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, 2019, 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)	585		$	152
Duke Energy Indiana
Gallagher Units 2 and 4(b)	280		114
Gibson Units 1-5(c)	3,132		1,697
Cayuga Units 1-2(c)	1,005		974
Total Duke Energy	$	5,002	$	2,937

(a) Duke Energy Carolinas will retire Allen Steam Station Units 1 through 3 by December 31, 2024, as part of the resolution of a lawsuit involving alleged New Source Review violations.

(b) 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.

(c)

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, includes proposed depreciation rates reflecting retirement dates from 2026 to 2038.

Progress Energy

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)	2019		2018		2019		2018
Regulatory Assets
AROs – coal ash	$	4,084	$	4,255	$	1,843	$	2,061
AROs – nuclear and other	739		772		668		601
Accrued pension and OPEB	2,391		2,654		897		1,074
Storm cost deferrals	1,399		1,117		1,214		953
Nuclear asset securitized balance, net	1,042		1,093		1,042		1,093
Debt fair value adjustment	1,019		1,099		—		—
Deferred fuel and purchased power	528		838		305		600
Deferred asset – Lee and Harris COLA	388		426		38		43
Hedge costs deferrals	356		204		129		74
Demand side management (DSM)/Energy Efficiency (EE)	343		449		241		256
Advanced metering infrastructure (AMI)	338		367		114		127
Retired generation facilities	331		402		266		324
Post-in-service carrying costs (PISCC) and deferred operating expenses	329		320		33		36
Vacation accrual	214		213		41		41
Derivatives – natural gas supply contracts	117		141		—		—
Nuclear deferral	107		133		40		46
Manufactured gas plant (MGP)	102		99		—		—
Deferred pipeline integrity costs	79		65		—		—
NCEMPA deferrals	72		50		72		50
East Bend deferrals	44		47		—		—
Transmission expansion obligation	36		39		—		—
Amounts due from customers	36		24		—		—
Grid modernization	28		31		—		—
Other	896		784		349		322
Total regulatory assets	15,018		15,622		7,292		7,701
Less: current portion	1,796		2,005		946		1,137
Total noncurrent regulatory assets	$	13,222	$	13,617	$	6,346	$	6,564
Regulatory Liabilities
Net regulatory liability related to income taxes	$	7,872	$	8,058	$	2,595	$	2,710
Costs of removal	5,756		5,421		2,561		2,135
AROs – nuclear and other	1,100		538		—		—
Accrued pension and OPEB	176		301		—		149
Amounts to be refunded to customers	34		34		—		—
Deferred fuel and purchased power	1		16		1		16
Other	1,109		1,064		398		319
Total regulatory liabilities	16,048		15,432		5,555		5,329
Less: current portion	784		598		330		280
Total noncurrent regulatory liabilities	$	15,264	$	14,834	$	5,225	$	5,049

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)	2019		2018		2019		2018
Regulatory Assets
AROs – coal ash	$	4,084	$	4,255	$	1,843	$	2,061
AROs – nuclear and other	739		772		668		601
Accrued pension and OPEB	2,391		2,654		897		1,074
Storm cost deferrals	1,399		1,117		1,214		953
Nuclear asset securitized balance, net	1,042		1,093		1,042		1,093
Debt fair value adjustment	1,019		1,099		—		—
Deferred fuel and purchased power	528		838		305		600
Deferred asset – Lee and Harris COLA	388		426		38		43
Hedge costs deferrals	356		204		129		74
Demand side management (DSM)/Energy Efficiency (EE)	343		449		241		256
Advanced metering infrastructure (AMI)	338		367		114		127
Retired generation facilities	331		402		266		324
Post-in-service carrying costs (PISCC) and deferred operating expenses	329		320		33		36
Vacation accrual	214		213		41		41
Derivatives – natural gas supply contracts	117		141		—		—
Nuclear deferral	107		133		40		46
Manufactured gas plant (MGP)	102		99		—		—
Deferred pipeline integrity costs	79		65		—		—
NCEMPA deferrals	72		50		72		50
East Bend deferrals	44		47		—		—
Transmission expansion obligation	36		39		—		—
Amounts due from customers	36		24		—		—
Grid modernization	28		31		—		—
Other	896		784		349		322
Total regulatory assets	15,018		15,622		7,292		7,701
Less: current portion	1,796		2,005		946		1,137
Total noncurrent regulatory assets	$	13,222	$	13,617	$	6,346	$	6,564
Regulatory Liabilities
Net regulatory liability related to income taxes	$	7,872	$	8,058	$	2,595	$	2,710
Costs of removal	5,756		5,421		2,561		2,135
AROs – nuclear and other	1,100		538		—		—
Accrued pension and OPEB	176		301		—		149
Amounts to be refunded to customers	34		34		—		—
Deferred fuel and purchased power	1		16		1		16
Other	1,109		1,064		398		319
Total regulatory liabilities	16,048		15,432		5,555		5,329
Less: current portion	784		598		330		280
Total noncurrent regulatory liabilities	$	15,264	$	14,834	$	5,225	$	5,049

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)	2019		2018		a Return	Period Ends
Regulatory Assets(a)
AROs – coal ash	$	1,696	$	1,725	(i)	(b)
Accrued pension and OPEB	477		581			(j)
Storm cost deferrals	178		160		Yes	(b)
Deferred fuel and purchased power	222		196		(f)	2021
Deferred asset – Lee COLA	350		383			(b)
Hedge costs deferrals(c)	198		101		Yes	2041
DSM/EE	100		169		(h)	(h)
AMI	166		176		Yes	(b)
Retired generation facilities(c)	16		21		Yes	2023
PISCC(c)	33		34		Yes	(b)
Vacation accrual	80		78		(e)	2020
Nuclear deferral	67		87			2021
Other	327		266			(b)
Total regulatory assets	3,910		3,977
Less: current portion	550		520
Total noncurrent regulatory assets	$	3,360	$	3,457
Regulatory Liabilities(a)
Net regulatory liability related to income taxes(d)	$	3,060	$	3,082		(b)
Costs of removal(c)	1,936		1,968		Yes	(g)
AROs – nuclear and other	1,100		538			(b)
Accrued pension and OPEB	39		38			(j)
Other	543		572			(b)
Total regulatory liabilities	6,678		6,198
Less: current portion	255		199
Total noncurrent regulatory liabilities	$	6,423	$	5,999

(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 24.

(e) Earns a return on outstanding balance in North Carolina.

(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) Recovered over the life of the associated assets.

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

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

(j)

Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 23 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)	2019		2018		a Return	Period Ends
Regulatory Assets(a)
AROs – coal ash	$	1,696	$	1,725	(i)	(b)
Accrued pension and OPEB	477		581			(j)
Storm cost deferrals	178		160		Yes	(b)
Deferred fuel and purchased power	222		196		(f)	2021
Deferred asset – Lee COLA	350		383			(b)
Hedge costs deferrals(c)	198		101		Yes	2041
DSM/EE	100		169		(h)	(h)
AMI	166		176		Yes	(b)
Retired generation facilities(c)	16		21		Yes	2023
PISCC(c)	33		34		Yes	(b)
Vacation accrual	80		78		(e)	2020
Nuclear deferral	67		87			2021
Other	327		266			(b)
Total regulatory assets	3,910		3,977
Less: current portion	550		520
Total noncurrent regulatory assets	$	3,360	$	3,457
Regulatory Liabilities(a)
Net regulatory liability related to income taxes(d)	$	3,060	$	3,082		(b)
Costs of removal(c)	1,936		1,968		Yes	(g)
AROs – nuclear and other	1,100		538			(b)
Accrued pension and OPEB	39		38			(j)
Other	543		572			(b)
Total regulatory liabilities	6,678		6,198
Less: current portion	255		199
Total noncurrent regulatory liabilities	$	6,423	$	5,999

(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 24.

(e) Earns a return on outstanding balance in North Carolina.

(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) Recovered over the life of the associated assets.

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

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

(j)

Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 23 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)	2019		2018		a Return	Period Ends
Regulatory Assets(a)
AROs – coal ash	$	1,834	$	2,051	(h)	(b)
AROs – nuclear and other	509		429			(c)
Accrued pension and OPEB	423		542			(k)
Storm cost deferrals(d)	801		571		Yes	(b)
Deferred fuel and purchased power	266		397		(f)	2021
Deferred asset – Harris COLA	38		43
Hedge costs deferrals	85		54			(b)
DSM/EE(e)	216		235		(i)	(i)
AMI	61		67			(b)
Retired generation facilities	83		105		Yes	(b)
PISCC and deferred operating expenses	33		36		Yes	2054
Vacation accrual	41		41			2020
Nuclear deferral	40		46			2021
NCEMPA deferrals	72		50		(g)	2042
Other	176		147			(b)
Total regulatory assets	4,678		4,814
Less: current portion	526		703
Total noncurrent regulatory assets	$	4,152	$	4,111
Regulatory Liabilities(a)
Net regulatory liability related to income taxes(l)	$	1,802	$	1,863		(b)
Costs of removal	2,294		1,878		Yes	(j)
Accrued pension and OPEB	—		93			(k)
Other	372		299			(b)
Total regulatory liabilities	4,468		4,133
Less: current portion	236		178
Total noncurrent regulatory liabilities	$	4,232	$	3,955

(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 23 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.

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)	2019		2018		a Return	Period Ends
Regulatory Assets(a)
AROs – coal ash	$	1,834	$	2,051	(h)	(b)
AROs – nuclear and other	509		429			(c)
Accrued pension and OPEB	423		542			(k)
Storm cost deferrals(d)	801		571		Yes	(b)
Deferred fuel and purchased power	266		397		(f)	2021
Deferred asset – Harris COLA	38		43
Hedge costs deferrals	85		54			(b)
DSM/EE(e)	216		235		(i)	(i)
AMI	61		67			(b)
Retired generation facilities	83		105		Yes	(b)
PISCC and deferred operating expenses	33		36		Yes	2054
Vacation accrual	41		41			2020
Nuclear deferral	40		46			2021
NCEMPA deferrals	72		50		(g)	2042
Other	176		147			(b)
Total regulatory assets	4,678		4,814
Less: current portion	526		703
Total noncurrent regulatory assets	$	4,152	$	4,111
Regulatory Liabilities(a)
Net regulatory liability related to income taxes(l)	$	1,802	$	1,863		(b)
Costs of removal	2,294		1,878		Yes	(j)
Accrued pension and OPEB	—		93			(k)
Other	372		299			(b)
Total regulatory liabilities	4,468		4,133
Less: current portion	236		178
Total noncurrent regulatory liabilities	$	4,232	$	3,955

(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 23 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.

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)	2019		2018		a Return	Period Ends
Regulatory Assets(a)
AROs – coal ash(c)	$	9	$	10		(b)
AROs – nuclear and other(c)	159		172			(b)
Accrued pension and OPEB(c)	474		532		Yes	(g)
Storm cost deferrals(c)	413		382		(e)	2021
Nuclear asset securitized balance, net	1,042		1,093			2036
Deferred fuel and purchased power	39		203		(f)	2021
Hedge costs deferrals	44		20			2038
DSM/EE(c)	25		21		Yes	2024
AMI(c)	53		60		Yes	2032
Retired generation facilities(c)	183		219		Yes	(b)
Other	172		176		(d)	(b)
Total regulatory assets	2,613		2,888
Less: current portion	419		434
Total noncurrent regulatory assets	$	2,194	$	2,454
Regulatory Liabilities(a)
Net regulatory liability related to income taxes(c)	$	793	$	847		(b)
Costs of removal(c)	267		257		(d)	(b)
Accrued pension and OPEB	—		56		Yes	(g)
Deferred fuel and purchased power(c)	1		16		(f)	2021
Other	26		20		(d)	(b)
Total regulatory liabilities	1,087		1,196
Less: current portion	94		102
Total noncurrent regulatory liabilities	$	993	$	1,094

(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 23 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)	2019		2018		a Return	Period Ends
Regulatory Assets(a)
AROs – coal ash(c)	$	9	$	10		(b)
AROs – nuclear and other(c)	159		172			(b)
Accrued pension and OPEB(c)	474		532		Yes	(g)
Storm cost deferrals(c)	413		382		(e)	2021
Nuclear asset securitized balance, net	1,042		1,093			2036
Deferred fuel and purchased power	39		203		(f)	2021
Hedge costs deferrals	44		20			2038
DSM/EE(c)	25		21		Yes	2024
AMI(c)	53		60		Yes	2032
Retired generation facilities(c)	183		219		Yes	(b)
Other	172		176		(d)	(b)
Total regulatory assets	2,613		2,888
Less: current portion	419		434
Total noncurrent regulatory assets	$	2,194	$	2,454
Regulatory Liabilities(a)
Net regulatory liability related to income taxes(c)	$	793	$	847		(b)
Costs of removal(c)	267		257		(d)	(b)
Accrued pension and OPEB	—		56		Yes	(g)
Deferred fuel and purchased power(c)	1		16		(f)	2021
Other	26		20		(d)	(b)
Total regulatory liabilities	1,087		1,196
Less: current portion	94		102
Total noncurrent regulatory liabilities	$	993	$	1,094

(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 23 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)	2019		2018		a Return	Period Ends
Regulatory Assets(a)
AROs – coal ash	$	16	$	20	Yes	(b)
Accrued pension and OPEB	155		146			(g)
Storm cost deferrals	7		4			2023
Deferred fuel and purchased power	1		2			2020
Hedge costs deferrals	6		5			(b)
DSM/EE	2		10		(f)	(e)
AMI	40		46			(b)
PISCC and deferred operating expenses(c)	17		17		Yes	2083
Vacation accrual	5		5			2020
MGP	102		99			(b)
Deferred pipeline integrity costs	17		14		Yes	(b)
East Bend deferrals	44		47		Yes	(b)
Transmission expansion obligation	40		43			(e)
Grid modernization	28		31		Yes	(b) (c)
Other	118		75			(b)
Total regulatory assets	598		564
Less: current portion	49		33
Total noncurrent regulatory assets	$	549	$	531
Regulatory Liabilities(a)
Net regulatory liability related to income taxes	$	654	$	678		(b)
Costs of removal	86		126			(d)
Accrued pension and OPEB	16		18			(g)
Other	71		75			(b)
Total regulatory liabilities	827		897
Less: current portion	64		57
Total noncurrent regulatory liabilities	$	763	$	840

(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 23 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)	2019		2018		a Return	Period Ends
Regulatory Assets(a)
AROs – coal ash	$	16	$	20	Yes	(b)
Accrued pension and OPEB	155		146			(g)
Storm cost deferrals	7		4			2023
Deferred fuel and purchased power	1		2			2020
Hedge costs deferrals	6		5			(b)
DSM/EE	2		10		(f)	(e)
AMI	40		46			(b)
PISCC and deferred operating expenses(c)	17		17		Yes	2083
Vacation accrual	5		5			2020
MGP	102		99			(b)
Deferred pipeline integrity costs	17		14		Yes	(b)
East Bend deferrals	44		47		Yes	(b)
Transmission expansion obligation	40		43			(e)
Grid modernization	28		31		Yes	(b) (c)
Other	118		75			(b)
Total regulatory assets	598		564
Less: current portion	49		33
Total noncurrent regulatory assets	$	549	$	531
Regulatory Liabilities(a)
Net regulatory liability related to income taxes	$	654	$	678		(b)
Costs of removal	86		126			(d)
Accrued pension and OPEB	16		18			(g)
Other	71		75			(b)
Total regulatory liabilities	827		897
Less: current portion	64		57
Total noncurrent regulatory liabilities	$	763	$	840

(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 23 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, 2019, and 2018, $40 million and $43 million, respectively, are recorded in Regulatory assets on Duke Energy Ohio's Consolidated Balance Sheets.

			Provisions/		Cash
(in millions)	December 31, 2018		Adjustments		Reductions			December 31, 2019
Duke Energy Ohio	$	58	$	—	$	(4	)	$	54

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)	2019		2018		a Return	Period Ends
Regulatory Assets(a)
AROs – coal ash	$	529	$	450		(b)
Accrued pension and OPEB	243		222			(f)
Deferred fuel and purchased power	—		40			2020
Hedge costs deferrals	23		24			(b)
DSM/EE	—		14		(e)	(e)
AMI(c)	18		18		Yes	(b)
Retired generation facilities(c)	49		57		Yes	2026
PISCC and deferred operating expenses(c)	246		233		Yes	(b)
Vacation accrual	12		11			2020
Other	52		88			(b)
Total regulatory assets	1,172		1,157
Less: current portion	90		175
Total noncurrent regulatory assets	$	1,082	$	982
Regulatory Liabilities(a)
Net regulatory liability related to income taxes	$	1,008	$	1,009		(b)
Costs of removal	599		628			(d)
Accrued pension and OPEB	90		67			(f)
Amounts to be refunded to customers	—		1			2020
Other	43		42			(b)
Total regulatory liabilities	1,740		1,747
Less: current portion	55		25
Total noncurrent regulatory liabilities	$	1,685	$	1,722

(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) Includes incentives on DSM/EE investments and is recovered through a tracker mechanism over a two-year period.

(f)

Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 23 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)	2019		2018		a Return	Period Ends
Regulatory Assets(a)
AROs – coal ash	$	529	$	450		(b)
Accrued pension and OPEB	243		222			(f)
Deferred fuel and purchased power	—		40			2020
Hedge costs deferrals	23		24			(b)
DSM/EE	—		14		(e)	(e)
AMI(c)	18		18		Yes	(b)
Retired generation facilities(c)	49		57		Yes	2026
PISCC and deferred operating expenses(c)	246		233		Yes	(b)
Vacation accrual	12		11			2020
Other	52		88			(b)
Total regulatory assets	1,172		1,157
Less: current portion	90		175
Total noncurrent regulatory assets	$	1,082	$	982
Regulatory Liabilities(a)
Net regulatory liability related to income taxes	$	1,008	$	1,009		(b)
Costs of removal	599		628			(d)
Accrued pension and OPEB	90		67			(f)
Amounts to be refunded to customers	—		1			2020
Other	43		42			(b)
Total regulatory liabilities	1,740		1,747
Less: current portion	55		25
Total noncurrent regulatory liabilities	$	1,685	$	1,722

(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) Includes incentives on DSM/EE investments and is recovered through a tracker mechanism over a two-year period.

(f)

Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 23 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)	2019		2018		a Return	Period Ends
Regulatory Assets(a)
AROs – nuclear and other	16		19			(d)
Accrued pension and OPEB(c)	90		99		Yes	(f)
Vacation accrual	12		12
Derivatives – natural gas supply contracts(e)	117		141
Deferred pipeline integrity costs(c)	62		51		Yes	(b)
Amounts due from customers	36		24		Yes	(b)
Other	30		11			(b)
Total regulatory assets	363		357
Less: current portion	73		54
Total noncurrent regulatory assets	$	290	$	303
Regulatory Liabilities(a)
Net regulatory liability related to income taxes	$	555	$	579		(b)
Costs of removal	574		564			(d)
Accrued pension and OPEB(c)	3		1		Yes	(f)
Amounts to be refunded to customers	34		33		Yes	(b)
Other	46		41			(b)
Total regulatory liabilities	1,212		1,218
Less: current portion	81		37
Total noncurrent regulatory liabilities	$	1,131	$	1,181

(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 23 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)	2019		2018		a Return	Period Ends
Regulatory Assets(a)
AROs – nuclear and other	16		19			(d)
Accrued pension and OPEB(c)	90		99		Yes	(f)
Vacation accrual	12		12
Derivatives – natural gas supply contracts(e)	117		141
Deferred pipeline integrity costs(c)	62		51		Yes	(b)
Amounts due from customers	36		24		Yes	(b)
Other	30		11			(b)
Total regulatory assets	363		357
Less: current portion	73		54
Total noncurrent regulatory assets	$	290	$	303
Regulatory Liabilities(a)
Net regulatory liability related to income taxes	$	555	$	579		(b)
Costs of removal	574		564			(d)
Accrued pension and OPEB(c)	3		1		Yes	(f)
Amounts to be refunded to customers	34		33		Yes	(b)
Other	46		41			(b)
Total regulatory liabilities	1,212		1,218
Less: current portion	81		37
Total noncurrent regulatory liabilities	$	1,131	$	1,181

(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 23 for additional detail.