Commitments And Contingencies (Tables)

9 Months Ended

Sep. 30, 2020

Commitments and Contingencies [Line Items]

Other Purchase Commitments

At September 30, 2020, related minimum future commitments were as follows (in millions):

	Alliant Energy		IPL		WPL
Natural gas		$983		$508		$475
Coal (a)	125		70		55
Other (b)	111		49		31
		$1,219		$627		$561

(a) 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 September 30, 2020 regarding expected future usage, which is subject to change.

(b)

Includes individual commitments incurred during the normal course of business that exceeded $1 million at September 30, 2020.

MGP Site Estimated Future Costs And Recorded Liabilities

At September 30, 2020, 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 September 30, 2020, such amounts for WPL were not material.

	Alliant Energy				IPL
Range of estimated future costs		$12	-	$29		$9	-	$24
Current and non-current environmental liabilities	16				13

IPL [Member]

Commitments and Contingencies [Line Items]

Other Purchase Commitments

At September 30, 2020, related minimum future commitments were as follows (in millions):

	Alliant Energy		IPL		WPL
Natural gas		$983		$508		$475
Coal (a)	125		70		55
Other (b)	111		49		31
		$1,219		$627		$561

(a) 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 September 30, 2020 regarding expected future usage, which is subject to change.

(b)

Includes individual commitments incurred during the normal course of business that exceeded $1 million at September 30, 2020.

MGP Site Estimated Future Costs And Recorded Liabilities

At September 30, 2020, 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 September 30, 2020, such amounts for WPL were not material.

	Alliant Energy				IPL
Range of estimated future costs		$12	-	$29		$9	-	$24
Current and non-current environmental liabilities	16				13

WPL [Member]

Commitments and Contingencies [Line Items]

Other Purchase Commitments

At September 30, 2020, related minimum future commitments were as follows (in millions):

	Alliant Energy		IPL		WPL
Natural gas		$983		$508		$475
Coal (a)	125		70		55
Other (b)	111		49		31
		$1,219		$627		$561

(a) 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 September 30, 2020 regarding expected future usage, which is subject to change.

(b)

Includes individual commitments incurred during the normal course of business that exceeded $1 million at September 30, 2020.