Derivative Instruments (Tables)

6 Months Ended

Jun. 30, 2024

Derivative Instruments [Line Items]

Notional Amounts Of Derivative Instruments

As of June 30, 2024, gross notional amounts and settlement/delivery years related to outstanding swap contracts, option contracts, physical forward contracts and FTRs that were accounted for as commodity derivative instruments were as follows (units in thousands):

	Electricity		FTRs		Natural Gas		Diesel Fuel
	MWhs	Years	MWhs	Years	Dths	Years	Gallons	Years
Alliant Energy	1,563	2024-2026	22,363	2024-2025	181,348	2024-2032	3,150	2024-2025
IPL	706	2024-2026	7,387	2024-2025	81,924	2024-2030	—	—
WPL	857	2024-2026	14,976	2024-2025	99,424	2024-2032	3,150	2024-2025

Fair Value Of Financial Instruments

Derivative instruments are recorded at fair value each reporting date on the balance sheets as assets or liabilities as follows (in millions):

	Alliant Energy		IPL		WPL
	June 30, 2024	December 31, 2023	June 30, 2024	December 31, 2023	June 30, 2024	December 31, 2023
Current derivative assets	$68	$44	$52	$30	$16	$14
Non-current derivative assets	35	44	20	24	15	20
Current derivative liabilities	42	51	22	22	20	29
Non-current derivative liabilities	49	47	9	8	40	39

Balance Sheet Offsetting

However, if the fair value amounts of derivative instruments by counterparty were netted, derivative assets and derivative liabilities related to commodity contracts would have been presented on the balance sheets as follows (in millions):

	Alliant Energy		IPL		WPL
	Gross		Gross		Gross
	(as reported)	Net	(as reported)	Net	(as reported)	Net
June 30, 2024
Derivative assets	$103	$75	$72	$56	$31	$19
Derivative liabilities	91	63	31	15	60	48
December 31, 2023
Derivative assets	88	47	54	32	34	15
Derivative liabilities	98	57	30	8	68	49

IPL [Member]

Derivative Instruments [Line Items]

Notional Amounts Of Derivative Instruments

As of June 30, 2024, gross notional amounts and settlement/delivery years related to outstanding swap contracts, option contracts, physical forward contracts and FTRs that were accounted for as commodity derivative instruments were as follows (units in thousands):

	Electricity		FTRs		Natural Gas		Diesel Fuel
	MWhs	Years	MWhs	Years	Dths	Years	Gallons	Years
Alliant Energy	1,563	2024-2026	22,363	2024-2025	181,348	2024-2032	3,150	2024-2025
IPL	706	2024-2026	7,387	2024-2025	81,924	2024-2030	—	—
WPL	857	2024-2026	14,976	2024-2025	99,424	2024-2032	3,150	2024-2025

Fair Value Of Financial Instruments

Derivative instruments are recorded at fair value each reporting date on the balance sheets as assets or liabilities as follows (in millions):

	Alliant Energy		IPL		WPL
	June 30, 2024	December 31, 2023	June 30, 2024	December 31, 2023	June 30, 2024	December 31, 2023
Current derivative assets	$68	$44	$52	$30	$16	$14
Non-current derivative assets	35	44	20	24	15	20
Current derivative liabilities	42	51	22	22	20	29
Non-current derivative liabilities	49	47	9	8	40	39

Balance Sheet Offsetting

However, if the fair value amounts of derivative instruments by counterparty were netted, derivative assets and derivative liabilities related to commodity contracts would have been presented on the balance sheets as follows (in millions):

	Alliant Energy		IPL		WPL
	Gross		Gross		Gross
	(as reported)	Net	(as reported)	Net	(as reported)	Net
June 30, 2024
Derivative assets	$103	$75	$72	$56	$31	$19
Derivative liabilities	91	63	31	15	60	48
December 31, 2023
Derivative assets	88	47	54	32	34	15
Derivative liabilities	98	57	30	8	68	49

WPL [Member]

Derivative Instruments [Line Items]

Notional Amounts Of Derivative Instruments

As of June 30, 2024, gross notional amounts and settlement/delivery years related to outstanding swap contracts, option contracts, physical forward contracts and FTRs that were accounted for as commodity derivative instruments were as follows (units in thousands):

	Electricity		FTRs		Natural Gas		Diesel Fuel
	MWhs	Years	MWhs	Years	Dths	Years	Gallons	Years
Alliant Energy	1,563	2024-2026	22,363	2024-2025	181,348	2024-2032	3,150	2024-2025
IPL	706	2024-2026	7,387	2024-2025	81,924	2024-2030	—	—
WPL	857	2024-2026	14,976	2024-2025	99,424	2024-2032	3,150	2024-2025

Fair Value Of Financial Instruments

Derivative instruments are recorded at fair value each reporting date on the balance sheets as assets or liabilities as follows (in millions):

	Alliant Energy		IPL		WPL
	June 30, 2024	December 31, 2023	June 30, 2024	December 31, 2023	June 30, 2024	December 31, 2023
Current derivative assets	$68	$44	$52	$30	$16	$14
Non-current derivative assets	35	44	20	24	15	20
Current derivative liabilities	42	51	22	22	20	29
Non-current derivative liabilities	49	47	9	8	40	39

Balance Sheet Offsetting

However, if the fair value amounts of derivative instruments by counterparty were netted, derivative assets and derivative liabilities related to commodity contracts would have been presented on the balance sheets as follows (in millions):

	Alliant Energy		IPL		WPL
	Gross		Gross		Gross
	(as reported)	Net	(as reported)	Net	(as reported)	Net
June 30, 2024
Derivative assets	$103	$75	$72	$56	$31	$19
Derivative liabilities	91	63	31	15	60	48
December 31, 2023
Derivative assets	88	47	54	32	34	15
Derivative liabilities	98	57	30	8	68	49