Commitments And Contingencies (Tables)

9 Months Ended

Sep. 30, 2012

Commitments and Contingencies Disclosure [Abstract]

Operating Expense Purchase Obligations

At September 30, 2012, minimum future commitments related to these operating expense purchase obligations were as follows (in millions):

	Alliant Energy		IPL		WPL
Purchased power (a):
Duane Arnold Energy Center (DAEC) (IPL)		$271		$271		$—
Kewaunee Nuclear Power Plant (Kewaunee) (WPL)	95		—		95
Other	63		4		59
	429		275		154
Natural gas	344		208		136
Coal (b)	302		79		52
SO2 emission allowances	34		34		—
Other (c)	22		9		13
		$1,131		$605		$355

(a) Includes payments required by PPAs for capacity rights and minimum quantities of MWhs required to be purchased. Excludes contracts that are considered operating leases.

(b) Corporate Services entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments of $171 million that have not been directly assigned to IPL and WPL since the specific needs of each utility were not yet known as of September 30, 2012.

(c) Includes individual commitments incurred during the normal course of business that exceeded $1 million at September 30, 2012.