Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2022

Derivative [Line Items]

Notional Amounts of Derivative Instruments

As of December 31, 2022, 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		Coal
	MWhs	Years	MWhs	Years	Dths	Years	Tons	Years
Alliant Energy	1,132	2023-2025	9,046	2023	224,060	2023-2032	781	2023
IPL	589	2023-2025	3,999	2023	115,237	2023-2030	396	2023
WPL	543	2023	5,047	2023	108,823	2023-2032	385	2023

Fair Value of Financial Instruments

At December 31, the fair values of current derivative assets are included in “Other current assets,” non-current derivative assets are included in “Deferred charges and other,” current derivative liabilities are included in “Other current liabilities” and non-current derivative liabilities are included in “Other liabilities” on the balance sheets as follows (in millions):

	Alliant Energy		IPL		WPL
	2022	2021	2022	2021	2022	2021
Current derivative assets	$111	$113	$69	$48	$42	$65
Non-current derivative assets	126	63	69	36	57	27
Current derivative liabilities	59	8	40	4	19	4
Non-current derivative liabilities	20	1	6	—	14	1

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 at December 31 as follows:

	Alliant Energy		IPL		WPL
	Gross		Gross		Gross
	(as reported)	Net	(as reported)	Net	(as reported)	Net
2022
Derivative assets	$237	$193	$138	$108	$99	$85
Derivative liabilities	79	35	46	16	33	19
2021
Derivative assets	176	171	84	83	92	88
Derivative liabilities	9	4	4	3	5	1

IPL [Member]

Derivative [Line Items]

Notional Amounts of Derivative Instruments

As of December 31, 2022, 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		Coal
	MWhs	Years	MWhs	Years	Dths	Years	Tons	Years
Alliant Energy	1,132	2023-2025	9,046	2023	224,060	2023-2032	781	2023
IPL	589	2023-2025	3,999	2023	115,237	2023-2030	396	2023
WPL	543	2023	5,047	2023	108,823	2023-2032	385	2023

Fair Value of Financial Instruments

At December 31, the fair values of current derivative assets are included in “Other current assets,” non-current derivative assets are included in “Deferred charges and other,” current derivative liabilities are included in “Other current liabilities” and non-current derivative liabilities are included in “Other liabilities” on the balance sheets as follows (in millions):

	Alliant Energy		IPL		WPL
	2022	2021	2022	2021	2022	2021
Current derivative assets	$111	$113	$69	$48	$42	$65
Non-current derivative assets	126	63	69	36	57	27
Current derivative liabilities	59	8	40	4	19	4
Non-current derivative liabilities	20	1	6	—	14	1

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 at December 31 as follows:

	Alliant Energy		IPL		WPL
	Gross		Gross		Gross
	(as reported)	Net	(as reported)	Net	(as reported)	Net
2022
Derivative assets	$237	$193	$138	$108	$99	$85
Derivative liabilities	79	35	46	16	33	19
2021
Derivative assets	176	171	84	83	92	88
Derivative liabilities	9	4	4	3	5	1

WPL [Member]

Derivative [Line Items]

Notional Amounts of Derivative Instruments

As of December 31, 2022, 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		Coal
	MWhs	Years	MWhs	Years	Dths	Years	Tons	Years
Alliant Energy	1,132	2023-2025	9,046	2023	224,060	2023-2032	781	2023
IPL	589	2023-2025	3,999	2023	115,237	2023-2030	396	2023
WPL	543	2023	5,047	2023	108,823	2023-2032	385	2023

Fair Value of Financial Instruments

At December 31, the fair values of current derivative assets are included in “Other current assets,” non-current derivative assets are included in “Deferred charges and other,” current derivative liabilities are included in “Other current liabilities” and non-current derivative liabilities are included in “Other liabilities” on the balance sheets as follows (in millions):

	Alliant Energy		IPL		WPL
	2022	2021	2022	2021	2022	2021
Current derivative assets	$111	$113	$69	$48	$42	$65
Non-current derivative assets	126	63	69	36	57	27
Current derivative liabilities	59	8	40	4	19	4
Non-current derivative liabilities	20	1	6	—	14	1

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 at December 31 as follows:

	Alliant Energy		IPL		WPL
	Gross		Gross		Gross
	(as reported)	Net	(as reported)	Net	(as reported)	Net
2022
Derivative assets	$237	$193	$138	$108	$99	$85
Derivative liabilities	79	35	46	16	33	19
2021
Derivative assets	176	171	84	83	92	88
Derivative liabilities	9	4	4	3	5	1