Leases (Tables)

3 Months Ended

Mar. 31, 2019

Leases [Line Items]

Schedule of Lease Details

Operating lease details are as follows (dollars in millions):

	Alliant Energy			IPL			WPL
March 31, 2019
Property, plant and equipment, net		$18			$10			$7
Other current liabilities		$3			$1			$1
Other liabilities	15			9			6
Total operating lease liabilities		$18			$10			$7
Three Months Ended March 31, 2019
Operating lease cost		$1			$—			$—
Weighted average remaining lease term	12 years			13 years			10 years
Weighted average discount rate	4		%	4		%	4		%

Schedule of Operating Lease Liability Maturities

As of March 31, 2019, expected maturities of lease liabilities were as follows (in millions):

	Remainder of 2019		2020		2021		2022		2023		Thereafter		Total		Less: amount representing interest		Present value of minimum lease payments
Operating Leases:
Alliant Energy		$2		$2		$2		$2		$2		$13		$23		$5		$18
IPL	1		1		1		1		1		9		14		4		10
WPL	1		1		1		1		1		3		8		1		7
WPL’s Finance Lease:
Sheboygan Falls Energy Facility	11		15		15		15		15		20		91		25		66

Schedule of Future Minimum Payments for Operating Leases

As of December 31, 2018, future minimum operating (excluding contingent rentals) and capital lease payments were as follows (in millions):

	2019		2020		2021		2022		2023		Thereafter		Total		Less: amount representing interest		Present value of minimum capital lease payments
Operating Leases:
Alliant Energy		$5		$5		$3		$3		$2		$12		$30
IPL	3		2		2		2		2		12		23
WPL	2		3		1		—		—		—		6
WPL’s Capital Lease:
Sheboygan Falls Energy Facility		$15		$15		$15		$15		$15		$19		$94		$26		$68

IPL [Member]

Leases [Line Items]

Schedule of Lease Details

Operating lease details are as follows (dollars in millions):

	Alliant Energy			IPL			WPL
March 31, 2019
Property, plant and equipment, net		$18			$10			$7
Other current liabilities		$3			$1			$1
Other liabilities	15			9			6
Total operating lease liabilities		$18			$10			$7
Three Months Ended March 31, 2019
Operating lease cost		$1			$—			$—
Weighted average remaining lease term	12 years			13 years			10 years
Weighted average discount rate	4		%	4		%	4		%

Schedule of Operating Lease Liability Maturities

As of March 31, 2019, expected maturities of lease liabilities were as follows (in millions):

	Remainder of 2019		2020		2021		2022		2023		Thereafter		Total		Less: amount representing interest		Present value of minimum lease payments
Operating Leases:
Alliant Energy		$2		$2		$2		$2		$2		$13		$23		$5		$18
IPL	1		1		1		1		1		9		14		4		10
WPL	1		1		1		1		1		3		8		1		7
WPL’s Finance Lease:
Sheboygan Falls Energy Facility	11		15		15		15		15		20		91		25		66

Schedule of Future Minimum Payments for Operating Leases

As of December 31, 2018, future minimum operating (excluding contingent rentals) and capital lease payments were as follows (in millions):

	2019		2020		2021		2022		2023		Thereafter		Total		Less: amount representing interest		Present value of minimum capital lease payments
Operating Leases:
Alliant Energy		$5		$5		$3		$3		$2		$12		$30
IPL	3		2		2		2		2		12		23
WPL	2		3		1		—		—		—		6
WPL’s Capital Lease:
Sheboygan Falls Energy Facility		$15		$15		$15		$15		$15		$19		$94		$26		$68

WPL [Member]

Leases [Line Items]

Schedule of Lease Details

WPL’s finance lease details are as follows (dollars in millions):

March 31, 2019
Property, plant and equipment, net		$37
Other current liabilities		$8
Finance lease obligations - Sheboygan Falls Energy Facility	58
Total finance lease liabilities		$66
Three Months Ended March 31, 2019
Depreciation expense		$1
Interest expense	2
Total finance lease expense		$3
Remaining lease term	6 years
Discount rate	11		%

Operating lease details are as follows (dollars in millions):

	Alliant Energy			IPL			WPL
March 31, 2019
Property, plant and equipment, net		$18			$10			$7
Other current liabilities		$3			$1			$1
Other liabilities	15			9			6
Total operating lease liabilities		$18			$10			$7
Three Months Ended March 31, 2019
Operating lease cost		$1			$—			$—
Weighted average remaining lease term	12 years			13 years			10 years
Weighted average discount rate	4		%	4		%	4		%

Schedule of Operating Lease Liability Maturities

As of March 31, 2019, expected maturities of lease liabilities were as follows (in millions):

	Remainder of 2019		2020		2021		2022		2023		Thereafter		Total		Less: amount representing interest		Present value of minimum lease payments
Operating Leases:
Alliant Energy		$2		$2		$2		$2		$2		$13		$23		$5		$18
IPL	1		1		1		1		1		9		14		4		10
WPL	1		1		1		1		1		3		8		1		7
WPL’s Finance Lease:
Sheboygan Falls Energy Facility	11		15		15		15		15		20		91		25		66

Schedule of Finance Lease Liability Maturities

As of March 31, 2019, expected maturities of lease liabilities were as follows (in millions):

	Remainder of 2019		2020		2021		2022		2023		Thereafter		Total		Less: amount representing interest		Present value of minimum lease payments
Operating Leases:
Alliant Energy		$2		$2		$2		$2		$2		$13		$23		$5		$18
IPL	1		1		1		1		1		9		14		4		10
WPL	1		1		1		1		1		3		8		1		7
WPL’s Finance Lease:
Sheboygan Falls Energy Facility	11		15		15		15		15		20		91		25		66

Schedule of Future Minimum Payments for Operating Leases

As of December 31, 2018, future minimum operating (excluding contingent rentals) and capital lease payments were as follows (in millions):

	2019		2020		2021		2022		2023		Thereafter		Total		Less: amount representing interest		Present value of minimum capital lease payments
Operating Leases:
Alliant Energy		$5		$5		$3		$3		$2		$12		$30
IPL	3		2		2		2		2		12		23
WPL	2		3		1		—		—		—		6
WPL’s Capital Lease:
Sheboygan Falls Energy Facility		$15		$15		$15		$15		$15		$19		$94		$26		$68

Schedule of Future Minimum Payments for Capital Leases

As of December 31, 2018, future minimum operating (excluding contingent rentals) and capital lease payments were as follows (in millions):

	2019		2020		2021		2022		2023		Thereafter		Total		Less: amount representing interest		Present value of minimum capital lease payments
Operating Leases:
Alliant Energy		$5		$5		$3		$3		$2		$12		$30
IPL	3		2		2		2		2		12		23
WPL	2		3		1		—		—		—		6
WPL’s Capital Lease:
Sheboygan Falls Energy Facility		$15		$15		$15		$15		$15		$19		$94		$26		$68