Leases (Tables)

12 Months Ended

Dec. 31, 2011


	Alliant Energy						IPL						WPL
	2011		2010		2009		2011		2010		2009		2011		2010		2009
Operating lease rental expenses (excluding contingent rentals)	$	72	$	73	$	79	$	4	$	4	$	4	$	63	$	63	$	68
Contingent rentals related to certain PPAs		4		4		7		—		—		—		4		4		7
Other contingent rentals		1		1		1		1		1		1		—		—		—

	$	77	$	78	$	87	$	5	$	5	$	5	$	67	$	67	$	75

Future Minimum Operating Lease Payments, Excluding Contingent Rentals


	2012		2013		2014		2015		2016		Thereafter		Total
Alliant Energy
Riverside Energy Center (Riverside) PPA (a)	$	59	$	17	$	—	$	—	$	—	$	—	$	76
Synthetic leases (b)		43		2		4		1		—		—		50
Other		8		9		4		4		3		20		48

	$	110	$	28	$	8	$	5	$	3	$	20	$	174

IPL
Operating leases	$	4	$	4	$	3	$	3	$	2	$	17	$	33

WPL
Riverside PPA (a)	$	59	$	17	$	—	$	—	$	—	$	—	$	76
Synthetic leases (b)		1		2		4		1		—		—		8
Other		4		5		1		—		—		1		11

	$	64	$	24	$	5	$	1	$	—	$	1	$	95

(a)

In November 2011, WPL filed a Certificate of Authority with the PSCW for the purchase of Riverside in the fourth quarter of 2012. A decision from the PSCW is expected in April 2012. If Riverside is purchased in the fourth quarter of 2012, capacity payments scheduled for 2013 will not occur. Refer to Note 20 for additional information on the Riverside PPA.

(b)

The synthetic leases relate to the financing of certain corporate headquarters (Alliant Energy) and utility railcars (Alliant Energy and WPL). The entities that lease these assets to Alliant Energy and WPL do not meet consolidation requirements and are not included on Alliant Energy's or WPL's Consolidated Balance Sheets. Alliant Energy and WPL have guaranteed the residual value of the related assets, which total $45 million and $4 million, respectively, in the aggregate. The guarantees extend through the maturity of each respective underlying lease with remaining terms up to four years. Residual value guarantee amounts have been included in the future minimum operating lease payments. Alliant Energy currently plans to exercise its option under the corporate headquarters lease and purchase the building at the expiration of the lease term in April 2012.

Future Minimum Capital Lease Payments


	2012		2013		2014		2015		2016		Thereafter		Total		Less: amount representing interest		Present value of net minimum capital lease payments
Capital leases	$	1	$	1	$	1	$	—	$	—	$	1	$	4	$	1	$	3

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

Schedule Of Operating Leases


	2011		2010		2009
Interest expense	$	11.7	$	12.0	$	12.3
Depreciation and amortization		6.2		6.2		6.2

	$	17.9	$	18.2	$	18.5

Future Minimum Capital Lease Payments


	2012		2013		2014		2015		2016		Thereafter		Total		Less: amount representing interest		Present value of net minimum capital lease payments
SFEF	$	15	$	15	$	15	$	15	$	15	$	128	$	203	$	96	$	107

- 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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