Asset Retirement Obligations (Tables)

6 Months Ended

Jun. 30, 2024

Asset Retirement Obligation [Abstract]

Schedule of Asset Retirement Obligations

The following table presents the AROs recorded on the Condensed Consolidated Balance Sheets.

	June 30, 2024
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Decommissioning of nuclear power facilities(a)	$	4,608	$	1,999	$	2,603	$	2,455	$	148	$	—	$	—	$	—
Closure of ash impoundments	5,473		2,058		2,091		2,067		24		71		1,253		—
Other	273		55		97		34		63		65		29		27
Total ARO	$	10,354	$	4,112	$	4,791	$	4,556	$	235	$	136	$	1,282	$	27
Less: Current portion	636		252		215		214		1		7		162		—
Total noncurrent ARO	$	9,718	$	3,860	$	4,576	$	4,342	$	234	$	129	$	1,120	$	27

Schedule of Change in Asset Retirement Obligation

The following table presents the change in liability associated with AROs for the Duke Energy Registrants.

			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, 2023(a)	$	9,156	$	4,013	$	4,145	$	3,870	$	275	$	136	$	809	$	26
Accretion expense(b)	204		90		96		91		5		3		17		1
Liabilities settled(c)	(306)		(95)		(167)		(120)		(47)		(3)		(40)		—
Revisions in estimates of cash flows(d)	1,300		104		717		715		2		—		496		—
Balance at June 30, 2024	$	10,354	$	4,112	$	4,791	$	4,556	$	235	$	136	$	1,282	$	27

(a)Primarily relates to decommissioning nuclear power facilities, closure of ash impoundments, asbestos removal, closure of landfills at fossil generation facilities, retirement of natural gas mains and removal of renewable energy generation assets.

(b)For the six months ended June 30, 2024, substantially all accretion expense relates to Duke Energy's regulated operations and has been deferred in accordance with regulatory accounting treatment.

(c)Primarily relates to ash impoundment closures and nuclear decommissioning.

(d)The revision amounts represent the change in discounted cash flows for estimated closure costs as evaluated on a site-by-site basis. The increases primarily relate to additional scope requirements to regulate the disposal of CCR in landfills and surface impoundments as a result of the 2024 CCR Rule, including an increase in groundwater monitoring wells.