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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2025

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 10. See Note 11 for additional information related to investments by major security type for the Duke Energy Registrants.

			September 30, 2025
(in millions)			Total Fair Value			Level 1			Level 2			Level 3			Not Categorized
NDTF cash and cash equivalents			$	172		$	172		$	—		$	—		$	—
NDTF equity securities			8,435			8,408			3			—			24
NDTF debt securities			4,170			1,439			2,731			—			—
Other equity securities			134			134			—			—			—
Other debt securities			244			52			192			—			—
Other cash and cash equivalents			76			76			—			—			—
Derivative assets			360			4			344			12			—
Total assets			13,591			10,285			3,270			12			24
Derivative liabilities			(248)			(2)			(246)			—			—
Net assets			$	13,343		$	10,283		$	3,024		$	12		$	24

			December 31, 2024
(in millions)			Total Fair Value			Level 1			Level 2			Level 3			Not Categorized
NDTF cash and cash equivalents			$	139		$	139		$	—		$	—		$	—
NDTF equity securities			8,233			8,203			2			—			28
NDTF debt securities			3,060			1,022			2,038			—			—
Other equity securities			160			160			—			—			—
Other debt securities			266			52			214			—			—
Other cash and cash equivalents			47			47			—			—			—
Derivative assets			434			2			423			9			—
Total assets			12,339			9,625			2,677			9			28
Derivative liabilities			(319)			(3)			(316)			—			—
Net assets			$	12,020		$	9,622		$	2,361		$	9		$	28

Reconciliation of Assets and Liabilities Measured At Fair Value on a Recurring Basis Using Unobservable Inputs

The following table provides 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)			2025						2024						2025						2024
Balance at beginning of period			$	14					$	35					$	9					$	15
Purchases, sales, issuances and settlements:
Purchases			—						—						14						29
Settlements			(4)						(13)						(2)						(36)
Total gains (losses) included on the Condensed Consolidated Balance Sheet			2						(5)						(9)						9
Balance at end of period			$	12					$	17					$	12					$	17

Quantitative Information Table - Level 3

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

			September 30, 2025
																					Weighted
			Fair Value																		Average
Investment Type			(in millions)			Valuation Technique			Unobservable Input			Range									Range
Duke Energy Ohio
FTRs			$	1		RTO auction pricing			FTR price – per MWh			$	—		-			$	1.14		$	0.22
Duke Energy Indiana
FTRs			11			RTO auction pricing			FTR price – per MWh			(2.13)			-			12.29			1.01
Duke Energy
Total Level 3 derivatives			$	12

December 31, 2024

Weighted

Fair Value

Average

Investment Type

(in millions)

Valuation Technique

Unobservable Input

Range

Range

Duke Energy Ohio

FTRs

$

1

RTO auction pricing

FTR price – per MWh

$

—

–

$

1.13

$

0.48

Duke Energy Indiana

FTRs

8

RTO auction pricing

FTR price – per MWh

(0.63)

–

9.24

0.94

Duke Energy

Total Level 3 derivatives

$

9

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, 2025												December 31, 2024
(in millions)			Book Value						Fair Value						Book Value						Fair Value
Duke Energy(a)			$	85,753					$	78,926					$	80,689					$	73,440
Duke Energy Carolinas			18,221						16,747						17,490						15,975
Progress Energy			26,084						24,179						24,496						22,548
Duke Energy Progress			13,897						12,449						12,504						11,009
Duke Energy Florida			10,542						9,943						10,348						9,752
Duke Energy Ohio			4,514						4,251						4,165						3,871
Duke Energy Indiana			5,096						4,643						4,798						4,329
Piedmont			4,305						4,030						4,003						3,584

(a)Book value of long-term debt includes $941 million and $1 billion at September 30, 2025, and December 31, 2024, respectively, 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, 2025
(in millions)			Total Fair Value			Level 1			Level 2						Not Categorized
NDTF cash and cash equivalents			$	84		$	84		$	—					$	—
NDTF equity securities			4,856			4,829			3						24
NDTF debt securities			2,329			747			1,582						—
Derivative assets			77			—			77						—
Total assets			7,346			5,660			1,662						24
Derivative liabilities			(79)			—			(79)						—
Net assets			$	7,267		$	5,660		$	1,583					$	24

			December 31, 2024
(in millions)			Total Fair Value			Level 1			Level 2						Not Categorized
NDTF cash and cash equivalents			$	62		$	62		$	—					$	—
NDTF equity securities			4,751			4,721			2						28
NDTF debt securities			1,651			520			1,131						—
Derivative assets			94			—			94						—
Total assets			6,558			5,303			1,227						28
Derivative liabilities			(88)			—			(88)						—
Net assets			$	6,470		$	5,303		$	1,139					$	28

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 table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.

			September 30, 2025												December 31, 2024
(in millions)			Total Fair Value			Level 1			Level 2						Total Fair Value			Level 1			Level 2
NDTF cash and cash equivalents			$	88		$	88		$	—					$	77		$	77		$	—
NDTF equity securities			3,579			3,579			—						3,482			3,482			—
NDTF debt securities			1,841			692			1,149						1,409			502			907
Other debt securities			24			—			24						24			—			24
Other cash and cash equivalents			14			14			—						23			23			—
Derivative assets			72			—			72						127			—			127
Total assets			5,618			4,373			1,245						5,142			4,084			1,058
Derivative liabilities			(54)			—			(54)						(58)			—			(58)
Net assets			$	5,564		$	4,373		$	1,191					$	5,084		$	4,084		$	1,000

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 table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.

			September 30, 2025												December 31, 2024
(in millions)			Total Fair Value			Level 1			Level 2						Total Fair Value			Level 1			Level 2
NDTF cash and cash equivalents			$	72		$	72		$	—					$	54		$	54		$	—
NDTF equity securities			3,445			3,445			—						3,362			3,362			—
NDTF debt securities			1,685			577			1,108						1,221			365			856
Other cash and cash equivalents			9			9			—						16			16			—
Derivative assets			62			—			62						109			—			109
Total assets			5,273			4,103			1,170						4,762			3,797			965
Derivative liabilities			(36)			—			(36)						(57)			—			(57)
Net assets			$	5,237		$	4,103		$	1,134					$	4,705		$	3,797		$	908

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 table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.

			September 30, 2025												December 31, 2024
(in millions)			Total Fair Value			Level 1			Level 2						Total Fair Value			Level 1			Level 2
NDTF cash and cash equivalents			$	16		$	16		$	—					$	23		$	23		$	—
NDTF equity securities			134			134			—						120			120			—
NDTF debt securities			156			115			41						188			137			51
Other debt securities			24			—			24						24			—			24
Other cash and cash equivalents			1			1			—						3			3			—
Derivative assets			10			—			10						18			—			18
Total assets			341			266			75						376			283			93
Derivative liabilities			(18)			—			(18)						(1)			—			(1)
Net assets			$	323		$	266		$	57					$	375		$	283		$	92

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 table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.

			September 30, 2025															December 31, 2024
(in millions)			Total Fair Value			Level 1			Level 2			Level 3						Total Fair Value			Level 1			Level 2			Level 3
Other equity securities			$	51		$	51		$	—		$	—					$	89		$	89		$	—		$	—
Other debt securities			28			—			28			—						56			—			56			—
Other cash and cash equivalents			1			1			—			—						1			1			—			—
Derivative assets			14			3			—			11						44			—			36			8
Total assets			94			55			28			11						190			90			92			8
Derivative liabilities			(7)			(2)			(5)			—						(3)			(3)			—			—
Net assets			$	87		$	53		$	23		$	11					$	187		$	87		$	92		$	8

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)			2025						2024						2025						2024
Balance at beginning of period			$	13					$	33					$	8					$	13
Purchases, sales, issuances and settlements:
Purchases			—						—						12						27
Settlements			(3)						(13)						—						(33)
Total gains (losses) included on the Condensed Consolidated Balance Sheet			1						(5)						(9)						8
Balance at end of period			$	11					$	15					$	11					$	15

Piedmont

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value Measurement amounts for Assets and Liabilities

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

			September 30, 2025												December 31, 2024
(in millions)			Total Fair Value			Level 1			Level 2									Total Fair Value			Level 1			Level 2
Derivative assets			$	1		$	1		$	—								$	1		$	1		$	—
Derivative liabilities			(78)			—			(78)									(94)			—			(94)
Net (liabilities) assets			$	(77)		$	1		$	(78)								$	(93)		$	1		$	(94)

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