Commitments And Contingencies (Tables)

12 Months Ended

Dec. 31, 2019

Long-term Purchase Commitment [Line Items]

Other Purchase Commitments

At December 31, 2019, the related minimum future commitments were as follows (in millions):

Alliant Energy	2020		2021		2022		2023		2024		Thereafter		Total
Purchased power (a)		$111		$—		$—		$—		$—		$—		$111
Natural gas	257		183		139		109		77		187		952
Coal (b)	75		27		10		10		—		—		122
Other (c)	56		13		11		9		7		12		108
		$499		$223		$160		$128		$84		$199		$1,293

IPL	2020		2021		2022		2023		2024		Thereafter		Total
Purchased power (a)		$110		$—		$—		$—		$—		$—		$110
Natural gas	135		101		77		67		55		89		524
Coal (b)	46		21		10		10		—		—		87
Other (c)	24		4		4		3		1		10		46
		$315		$126		$91		$80		$56		$99		$767

WPL	2020		2021		2022		2023		2024		Thereafter		Total
Purchased power		$1		$—		$—		$—		$—		$—		$1
Natural gas	122		82		62		42		22		98		428
Coal (b)	29		6		—		—		—		—		35
Other (c)	24		1		1		1		1		1		29
		$176		$89		$63		$43		$23		$99		$493

(a) Includes payments required by PPAs for capacity rights and minimum quantities of MWhs required to be purchased. As a result of an amendment to shorten the term of the DAEC PPA, Alliant Energy’s and IPL’s amounts include minimum future commitments related to IPL’s purchase of capacity and the resulting energy from DAEC through September 2020, and do not include the September 2020 buyout payment of $110 million.

(b) Corporate Services has historically entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments. Such commitments were assigned to IPL and WPL based on information available as of December 31, 2019 regarding expected future usage, which is subject to change.

(c)

Includes individual commitments incurred during the normal course of business that exceeded $1 million at December 31, 2019.

Schedule of Environmental Liabilities

At December 31, 2019, estimated future costs expected to be incurred for the investigation, remediation and monitoring of the MGP sites, as well as environmental liabilities recorded on the balance sheets for these sites, which are not discounted, were as follows (in millions). At December 31, 2019, such amounts for WPL were not material.

	Alliant Energy				IPL
Range of estimated future costs		$14	-	$30		$12	-	$25
Current and non-current environmental liabilities	18				15

IPL [Member]

Long-term Purchase Commitment [Line Items]

Other Purchase Commitments

At December 31, 2019, the related minimum future commitments were as follows (in millions):

Alliant Energy	2020		2021		2022		2023		2024		Thereafter		Total
Purchased power (a)		$111		$—		$—		$—		$—		$—		$111
Natural gas	257		183		139		109		77		187		952
Coal (b)	75		27		10		10		—		—		122
Other (c)	56		13		11		9		7		12		108
		$499		$223		$160		$128		$84		$199		$1,293

IPL	2020		2021		2022		2023		2024		Thereafter		Total
Purchased power (a)		$110		$—		$—		$—		$—		$—		$110
Natural gas	135		101		77		67		55		89		524
Coal (b)	46		21		10		10		—		—		87
Other (c)	24		4		4		3		1		10		46
		$315		$126		$91		$80		$56		$99		$767

WPL	2020		2021		2022		2023		2024		Thereafter		Total
Purchased power		$1		$—		$—		$—		$—		$—		$1
Natural gas	122		82		62		42		22		98		428
Coal (b)	29		6		—		—		—		—		35
Other (c)	24		1		1		1		1		1		29
		$176		$89		$63		$43		$23		$99		$493

(a) Includes payments required by PPAs for capacity rights and minimum quantities of MWhs required to be purchased. As a result of an amendment to shorten the term of the DAEC PPA, Alliant Energy’s and IPL’s amounts include minimum future commitments related to IPL’s purchase of capacity and the resulting energy from DAEC through September 2020, and do not include the September 2020 buyout payment of $110 million.

(b) Corporate Services has historically entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments. Such commitments were assigned to IPL and WPL based on information available as of December 31, 2019 regarding expected future usage, which is subject to change.

(c)

Includes individual commitments incurred during the normal course of business that exceeded $1 million at December 31, 2019.

Schedule of Environmental Liabilities

At December 31, 2019, estimated future costs expected to be incurred for the investigation, remediation and monitoring of the MGP sites, as well as environmental liabilities recorded on the balance sheets for these sites, which are not discounted, were as follows (in millions). At December 31, 2019, such amounts for WPL were not material.

	Alliant Energy				IPL
Range of estimated future costs		$14	-	$30		$12	-	$25
Current and non-current environmental liabilities	18				15

WPL [Member]

Long-term Purchase Commitment [Line Items]

Other Purchase Commitments

At December 31, 2019, the related minimum future commitments were as follows (in millions):

Alliant Energy	2020		2021		2022		2023		2024		Thereafter		Total
Purchased power (a)		$111		$—		$—		$—		$—		$—		$111
Natural gas	257		183		139		109		77		187		952
Coal (b)	75		27		10		10		—		—		122
Other (c)	56		13		11		9		7		12		108
		$499		$223		$160		$128		$84		$199		$1,293

IPL	2020		2021		2022		2023		2024		Thereafter		Total
Purchased power (a)		$110		$—		$—		$—		$—		$—		$110
Natural gas	135		101		77		67		55		89		524
Coal (b)	46		21		10		10		—		—		87
Other (c)	24		4		4		3		1		10		46
		$315		$126		$91		$80		$56		$99		$767

WPL	2020		2021		2022		2023		2024		Thereafter		Total
Purchased power		$1		$—		$—		$—		$—		$—		$1
Natural gas	122		82		62		42		22		98		428
Coal (b)	29		6		—		—		—		—		35
Other (c)	24		1		1		1		1		1		29
		$176		$89		$63		$43		$23		$99		$493

(a) Includes payments required by PPAs for capacity rights and minimum quantities of MWhs required to be purchased. As a result of an amendment to shorten the term of the DAEC PPA, Alliant Energy’s and IPL’s amounts include minimum future commitments related to IPL’s purchase of capacity and the resulting energy from DAEC through September 2020, and do not include the September 2020 buyout payment of $110 million.

(b) Corporate Services has historically entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments. Such commitments were assigned to IPL and WPL based on information available as of December 31, 2019 regarding expected future usage, which is subject to change.

(c)

Includes individual commitments incurred during the normal course of business that exceeded $1 million at December 31, 2019.