Regulatory Matters (Tables)

6 Months Ended

Jun. 30, 2025

Regulatory assets were comprised of the following items (in millions):


	Alliant Energy		IPL		WPL
	June 30, 2025	December 31, 2024	June 30, 2025	December 31, 2024	June 30, 2025	December 31, 2024
Tax-related	$1,030	$989	$897	$870	$133	$119
AROs	427	401	296	281	131	120
Pension and OPEB costs	306	315	153	157	153	158
Assets retired early	167	180	157	168	10	12
Derivatives	57	60	14	15	43	45
Non-service pension and OPEB costs	54	51	20	19	34	32
Commodity cost recovery	49	68	10	2	39	66
WPL’s Western Wisconsin gas distribution expansion investments	40	42	—	—	40	42


Other	157	168	68	74	89	94
	$2,287	$2,274	$1,615	$1,586	$672	$688

Regulatory liabilities were comprised of the following items (in millions):

Regulatory assets were comprised of the following items (in millions):


	Alliant Energy		IPL		WPL
	June 30, 2025	December 31, 2024	June 30, 2025	December 31, 2024	June 30, 2025	December 31, 2024
Tax-related	$1,030	$989	$897	$870	$133	$119
AROs	427	401	296	281	131	120
Pension and OPEB costs	306	315	153	157	153	158
Assets retired early	167	180	157	168	10	12
Derivatives	57	60	14	15	43	45
Non-service pension and OPEB costs	54	51	20	19	34	32
Commodity cost recovery	49	68	10	2	39	66
WPL’s Western Wisconsin gas distribution expansion investments	40	42	—	—	40	42


Other	157	168	68	74	89	94
	$2,287	$2,274	$1,615	$1,586	$672	$688

Regulatory liabilities were comprised of the following items (in millions):

Regulatory assets were comprised of the following items (in millions):


	Alliant Energy		IPL		WPL
	June 30, 2025	December 31, 2024	June 30, 2025	December 31, 2024	June 30, 2025	December 31, 2024
Tax-related	$1,030	$989	$897	$870	$133	$119
AROs	427	401	296	281	131	120
Pension and OPEB costs	306	315	153	157	153	158
Assets retired early	167	180	157	168	10	12
Derivatives	57	60	14	15	43	45
Non-service pension and OPEB costs	54	51	20	19	34	32
Commodity cost recovery	49	68	10	2	39	66
WPL’s Western Wisconsin gas distribution expansion investments	40	42	—	—	40	42


Other	157	168	68	74	89	94
	$2,287	$2,274	$1,615	$1,586	$672	$688

Regulatory liabilities were comprised of the following items (in millions):