Common Equity (Tables)

9 Months Ended

Sep. 30, 2013

Stockholders' Equity Note [Abstract]

Common Share Activity

A summary of Alliant Energy’s common stock activity was as follows:

Shares outstanding, January 1, 2013	110,987,400
Equity-based compensation plans (Note 5(b))	(23,374	)
Other	(20,357	)
Shares outstanding, September 30, 2013	110,943,669