Common Equity (Tables)

6 Months Ended

Jun. 30, 2015

Stockholders' Equity Note [Abstract]

Common Share Activity

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

Shares outstanding, January 1, 2015	110,935,680
At-the-market offering program	2,186,617
Shareowner Direct Plan	107,412
Equity-based compensation plans (Note 9(b))	56,378
Other	(22,463	)
Shares outstanding, June 30, 2015	113,263,624