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Leases (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Operating Lease Rent Expense

Rental expenses associated with operating leases were as follows (in millions):



	Alliant Energy						IPL						WPL
	2012		2011		2010		2012		2011		2010		2012		2011		2010
Operating lease rental expenses (excluding contingent rentals)		$69		$70		$70		$4		$4		$4		$64		$63		$63
Contingent rentals (primarily related to certain PPAs)	6		5		5		—		1		1		5		4		4
		$75		$75		$75		$4		$5		$5		$69		$67		$67

Schedule of Future Minimum Rental Payments for Operating Leases

At December 31, 2012, future minimum operating lease payments, excluding contingent rentals, were as follows (in millions):



	2013		2014		2015		2016		2017		Thereafter		Total
Alliant Energy		$9		$13		$5		$3		$2		$24		$56
IPL	4		3		3		2		2		16		30
WPL	4		9		2		1		—		—		16

IPL [Member]

Schedule of Operating Lease Rent Expense

At December 31, 2012, future minimum operating lease payments, excluding contingent rentals, were as follows (in millions):



	2013		2014		2015		2016		2017		Thereafter		Total
Alliant Energy		$9		$13		$5		$3		$2		$24		$56
IPL	4		3		3		2		2		16		30
WPL	4		9		2		1		—		—		16

Rental expenses associated with operating leases were as follows (in millions):



	Alliant Energy						IPL						WPL
	2012		2011		2010		2012		2011		2010		2012		2011		2010
Operating lease rental expenses (excluding contingent rentals)		$69		$70		$70		$4		$4		$4		$64		$63		$63
Contingent rentals (primarily related to certain PPAs)	6		5		5		—		1		1		5		4		4
		$75		$75		$75		$4		$5		$5		$69		$67		$67

WPL [Member]

Schedule of Operating Lease Rent Expense

Rental expenses associated with operating leases were as follows (in millions):



	Alliant Energy						IPL						WPL
	2012		2011		2010		2012		2011		2010		2012		2011		2010
Operating lease rental expenses (excluding contingent rentals)		$69		$70		$70		$4		$4		$4		$64		$63		$63
Contingent rentals (primarily related to certain PPAs)	6		5		5		—		1		1		5		4		4
		$75		$75		$75		$4		$5		$5		$69		$67		$67

At December 31, 2012, future minimum operating lease payments, excluding contingent rentals, were as follows (in millions):



	2013		2014		2015		2016		2017		Thereafter		Total
Alliant Energy		$9		$13		$5		$3		$2		$24		$56
IPL	4		3		3		2		2		16		30
WPL	4		9		2		1		—		—		16

WPL [Member] | Sheboygan Falls Energy Facility [Member]

Schedule of Operating Lease Rent Expense

SFEF lease expenses were included in WPL’s Consolidated Statements of Income as follows (in millions):



	2012		2011		2010
Interest expense		$11.3		$11.7		$12.0
Depreciation and amortization	6.2		6.2		6.2
		$17.5		$17.9		$18.2

Schedule of Future Minimum Lease Payments for Capital Leases

At December 31, 2012, WPL’s estimated future minimum capital lease payments for SFEF were as follows (in millions):



	2013	2014	2015	2016	2017	Thereafter	Total	Less: amount representing interest	Present value of minimum capital lease payments
SFEF	$15	$15	$15	$15	$15	$113	$188	$85	$103

- Definition

Tabular disclosure of a lessee's leasing arrangements including: (1) the basis on which contingent rental payments are determined, (2) the existence and terms of renewal or purchase options and escalation clauses, (3) restrictions imposed by lease arrangements, such as those concerning dividends, additional debt, and further leasing, (4) rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. Disclosure may also include the specific period used to amortize material leasehold improvements made at the inception of the lease or during the lease term. Additionally, for operating leases having initial or remaining noncancelable lease terms in excess of one year: (a) future minimum rental payments required as of the date of the latest balance sheet presented, in the aggregate and for each of the five succeeding fiscal years, (b) the total of minimum rentals to be received in the future under noncancelable subleases as of the date of the latest balance sheet presented, and (c) for all operating leases, rental expense for each period for which an income statement is presented, with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included.

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