Debt (Tables)

3 Months Ended

Mar. 31, 2023

Short-term Debt [Line Items]

Other Short-Term Borrowings

Information regarding Alliant Energy’s, IPL’s and WPL’s commercial paper classified as short-term debt was as follows (dollars in millions):

March 31, 2023	Alliant Energy	IPL	WPL
Amount outstanding	$60	$—	$60
Weighted average interest rates	5.1%	N/A	5.1%
Available credit facility capacity	$940	$250	$240

	Alliant Energy		WPL
Three Months Ended March 31	2023	2022	2023	2022
Maximum amount outstanding (based on daily outstanding balances)	$793	$577	$349	$252
Average amount outstanding (based on daily outstanding balances)	$574	$443	$304	$205
Weighted average interest rates	4.8%	0.3%	4.8%	0.3%

IPL [Member]

Short-term Debt [Line Items]

Other Short-Term Borrowings

Information regarding Alliant Energy’s, IPL’s and WPL’s commercial paper classified as short-term debt was as follows (dollars in millions):

March 31, 2023	Alliant Energy	IPL	WPL
Amount outstanding	$60	$—	$60
Weighted average interest rates	5.1%	N/A	5.1%
Available credit facility capacity	$940	$250	$240

	Alliant Energy		WPL
Three Months Ended March 31	2023	2022	2023	2022
Maximum amount outstanding (based on daily outstanding balances)	$793	$577	$349	$252
Average amount outstanding (based on daily outstanding balances)	$574	$443	$304	$205
Weighted average interest rates	4.8%	0.3%	4.8%	0.3%

WPL [Member]

Short-term Debt [Line Items]

Other Short-Term Borrowings

Information regarding Alliant Energy’s, IPL’s and WPL’s commercial paper classified as short-term debt was as follows (dollars in millions):

March 31, 2023	Alliant Energy	IPL	WPL
Amount outstanding	$60	$—	$60
Weighted average interest rates	5.1%	N/A	5.1%
Available credit facility capacity	$940	$250	$240

	Alliant Energy		WPL
Three Months Ended March 31	2023	2022	2023	2022
Maximum amount outstanding (based on daily outstanding balances)	$793	$577	$349	$252
Average amount outstanding (based on daily outstanding balances)	$574	$443	$304	$205
Weighted average interest rates	4.8%	0.3%	4.8%	0.3%