Debt

9 Months Ended

Sep. 30, 2021

Debt [Line Items]

Debt

DEBT

NOTE 7(a) Short-term Debt - In the third quarter of 2021, Alliant Energy, IPL and WPL reallocated credit facility capacity amounts to $500 million for Alliant Energy at the parent company level, $100 million for IPL and $400 million for WPL, within the $1 billion total commitment. Information regarding Alliant Energy’s, IPL’s and WPL’s commercial paper, and Alliant Energy’s and WPL’s borrowings under the single credit facility, which currently expires in August 2023, classified as short-term debt was as follows (dollars in millions):

September 30, 2021	Alliant Energy	IPL	WPL
Amount outstanding	$316	$—	$3
Weighted average interest rates	0.2%	N/A	0.1%
Available credit facility capacity	$684	$100	$397

	Alliant Energy		IPL		WPL
Three Months Ended September 30	2021	2020	2021	2020	2021	2020
Maximum amount outstanding (based on daily outstanding balances)	$648	$422	$8	$—	$320	$139
Average amount outstanding (based on daily outstanding balances)	$560	$252	$—	$—	$221	$83
Weighted average interest rates	0.2%	0.2%	0.2%	N/A	0.1%	0.2%
Nine Months Ended September 30
Maximum amount outstanding (based on daily outstanding balances)	$648	$463	$19	$8	$320	$212
Average amount outstanding (based on daily outstanding balances)	$479	$252	$—	$—	$196	$86
Weighted average interest rates	0.2%	1.1%	0.2%	0.5%	0.1%	1.2%

NOTE 7(b) Long-term Debt - In September 2021, WPL issued $300 million of 1.95% debentures due 2031. The debentures were issued as green bonds, and an amount equal to or in excess of the net proceeds will be disbursed for the construction and development of WPL’s wind and solar EGUs.

IPL [Member]

Debt [Line Items]

Debt

DEBT

NOTE 7(a) Short-term Debt - In the third quarter of 2021, Alliant Energy, IPL and WPL reallocated credit facility capacity amounts to $500 million for Alliant Energy at the parent company level, $100 million for IPL and $400 million for WPL, within the $1 billion total commitment. Information regarding Alliant Energy’s, IPL’s and WPL’s commercial paper, and Alliant Energy’s and WPL’s borrowings under the single credit facility, which currently expires in August 2023, classified as short-term debt was as follows (dollars in millions):

September 30, 2021	Alliant Energy	IPL	WPL
Amount outstanding	$316	$—	$3
Weighted average interest rates	0.2%	N/A	0.1%
Available credit facility capacity	$684	$100	$397

	Alliant Energy		IPL		WPL
Three Months Ended September 30	2021	2020	2021	2020	2021	2020
Maximum amount outstanding (based on daily outstanding balances)	$648	$422	$8	$—	$320	$139
Average amount outstanding (based on daily outstanding balances)	$560	$252	$—	$—	$221	$83
Weighted average interest rates	0.2%	0.2%	0.2%	N/A	0.1%	0.2%
Nine Months Ended September 30
Maximum amount outstanding (based on daily outstanding balances)	$648	$463	$19	$8	$320	$212
Average amount outstanding (based on daily outstanding balances)	$479	$252	$—	$—	$196	$86
Weighted average interest rates	0.2%	1.1%	0.2%	0.5%	0.1%	1.2%

NOTE 7(b) Long-term Debt - In September 2021, WPL issued $300 million of 1.95% debentures due 2031. The debentures were issued as green bonds, and an amount equal to or in excess of the net proceeds will be disbursed for the construction and development of WPL’s wind and solar EGUs.

WPL [Member]

Debt [Line Items]

Debt

DEBT

NOTE 7(a) Short-term Debt - In the third quarter of 2021, Alliant Energy, IPL and WPL reallocated credit facility capacity amounts to $500 million for Alliant Energy at the parent company level, $100 million for IPL and $400 million for WPL, within the $1 billion total commitment. Information regarding Alliant Energy’s, IPL’s and WPL’s commercial paper, and Alliant Energy’s and WPL’s borrowings under the single credit facility, which currently expires in August 2023, classified as short-term debt was as follows (dollars in millions):

September 30, 2021	Alliant Energy	IPL	WPL
Amount outstanding	$316	$—	$3
Weighted average interest rates	0.2%	N/A	0.1%
Available credit facility capacity	$684	$100	$397

	Alliant Energy		IPL		WPL
Three Months Ended September 30	2021	2020	2021	2020	2021	2020
Maximum amount outstanding (based on daily outstanding balances)	$648	$422	$8	$—	$320	$139
Average amount outstanding (based on daily outstanding balances)	$560	$252	$—	$—	$221	$83
Weighted average interest rates	0.2%	0.2%	0.2%	N/A	0.1%	0.2%
Nine Months Ended September 30
Maximum amount outstanding (based on daily outstanding balances)	$648	$463	$19	$8	$320	$212
Average amount outstanding (based on daily outstanding balances)	$479	$252	$—	$—	$196	$86
Weighted average interest rates	0.2%	1.1%	0.2%	0.5%	0.1%	1.2%

NOTE 7(b) Long-term Debt - In September 2021, WPL issued $300 million of 1.95% debentures due 2031. The debentures were issued as green bonds, and an amount equal to or in excess of the net proceeds will be disbursed for the construction and development of WPL’s wind and solar EGUs.