Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2024

Derivative Instruments [Line Items]

Notional Amounts Of Derivative Instruments

As of September 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	1,841	2024-2026	15,595	2024-2025	156,626	2024-2032	3,150	2024-2025
IPL	675	2024-2026	5,385	2024-2025	67,817	2024-2030	—	—
WPL	1,166	2024-2026	10,210	2024-2025	88,809	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
	September 30, 2024	December 31, 2023	September 30, 2024	December 31, 2023	September 30, 2024	December 31, 2023
Current derivative assets	$51	$44	$37	$30	$14	$14
Non-current derivative assets	31	44	18	24	13	20
Current derivative liabilities	31	51	14	22	17	29
Non-current derivative liabilities	45	47	6	8	39	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
September 30, 2024
Derivative assets	$82	$63	$55	$45	$27	$18
Derivative liabilities	76	57	20	10	56	47
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 September 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	1,841	2024-2026	15,595	2024-2025	156,626	2024-2032	3,150	2024-2025
IPL	675	2024-2026	5,385	2024-2025	67,817	2024-2030	—	—
WPL	1,166	2024-2026	10,210	2024-2025	88,809	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
	September 30, 2024	December 31, 2023	September 30, 2024	December 31, 2023	September 30, 2024	December 31, 2023
Current derivative assets	$51	$44	$37	$30	$14	$14
Non-current derivative assets	31	44	18	24	13	20
Current derivative liabilities	31	51	14	22	17	29
Non-current derivative liabilities	45	47	6	8	39	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
September 30, 2024
Derivative assets	$82	$63	$55	$45	$27	$18
Derivative liabilities	76	57	20	10	56	47
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 September 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	1,841	2024-2026	15,595	2024-2025	156,626	2024-2032	3,150	2024-2025
IPL	675	2024-2026	5,385	2024-2025	67,817	2024-2030	—	—
WPL	1,166	2024-2026	10,210	2024-2025	88,809	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
	September 30, 2024	December 31, 2023	September 30, 2024	December 31, 2023	September 30, 2024	December 31, 2023
Current derivative assets	$51	$44	$37	$30	$14	$14
Non-current derivative assets	31	44	18	24	13	20
Current derivative liabilities	31	51	14	22	17	29
Non-current derivative liabilities	45	47	6	8	39	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
September 30, 2024
Derivative assets	$82	$63	$55	$45	$27	$18
Derivative liabilities	76	57	20	10	56	47
December 31, 2023
Derivative assets	88	47	54	32	34	15
Derivative liabilities	98	57	30	8	68	49