Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2024

Derivative Instruments [Line Items]

Notional Amounts Of Derivative Instruments

As of March 31, 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
	MWhs	Years	MWhs	Years	Dths	Years
Alliant Energy	1,412	2024-2026	4,162	2024	173,746	2024-2032
IPL	673	2024-2026	1,444	2024	78,790	2024-2030
WPL	739	2024-2026	2,718	2024	94,956	2024-2032

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
	March 31, 2024	December 31, 2023	March 31, 2024	December 31, 2023	March 31, 2024	December 31, 2023
Current derivative assets	$16	$44	$12	$30	$4	$14
Non-current derivative assets	40	44	22	24	18	20
Current derivative liabilities	49	51	23	22	26	29
Non-current derivative liabilities	45	47	7	8	38	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
March 31, 2024
Derivative assets	$56	$26	$34	$17	$22	$9
Derivative liabilities	94	64	30	13	64	51
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 March 31, 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
	MWhs	Years	MWhs	Years	Dths	Years
Alliant Energy	1,412	2024-2026	4,162	2024	173,746	2024-2032
IPL	673	2024-2026	1,444	2024	78,790	2024-2030
WPL	739	2024-2026	2,718	2024	94,956	2024-2032

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
	March 31, 2024	December 31, 2023	March 31, 2024	December 31, 2023	March 31, 2024	December 31, 2023
Current derivative assets	$16	$44	$12	$30	$4	$14
Non-current derivative assets	40	44	22	24	18	20
Current derivative liabilities	49	51	23	22	26	29
Non-current derivative liabilities	45	47	7	8	38	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
March 31, 2024
Derivative assets	$56	$26	$34	$17	$22	$9
Derivative liabilities	94	64	30	13	64	51
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 March 31, 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
	MWhs	Years	MWhs	Years	Dths	Years
Alliant Energy	1,412	2024-2026	4,162	2024	173,746	2024-2032
IPL	673	2024-2026	1,444	2024	78,790	2024-2030
WPL	739	2024-2026	2,718	2024	94,956	2024-2032

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
	March 31, 2024	December 31, 2023	March 31, 2024	December 31, 2023	March 31, 2024	December 31, 2023
Current derivative assets	$16	$44	$12	$30	$4	$14
Non-current derivative assets	40	44	22	24	18	20
Current derivative liabilities	49	51	23	22	26	29
Non-current derivative liabilities	45	47	7	8	38	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
March 31, 2024
Derivative assets	$56	$26	$34	$17	$22	$9
Derivative liabilities	94	64	30	13	64	51
December 31, 2023
Derivative assets	88	47	54	32	34	15
Derivative liabilities	98	57	30	8	68	49