Common Equity (Tables)

6 Months Ended

Jun. 30, 2012

Stockholders' Equity Note [Abstract]

Common Share Activity

A summary of Alliant Energy’s common stock activity during the six months ended June 30, 2012 was as follows:

Shares outstanding, January 1	111,018,821
Equity incentive plans (Note 5(b))	8,937
Other (a)	(51,616	)
Shares outstanding, June 30	110,976,142

(a) Includes shares transferred from employees to Alliant Energy to satisfy tax withholding requirements in connection with the vesting of certain restricted stock under the equity incentive plans.