Common Equity (Tables)

9 Months Ended

Sep. 30, 2017

Stockholders' Equity Note [Abstract]

Common Share Activity

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

Shares outstanding, January 1, 2017	227,673,654
At-the-market offering program	3,074,931
Shareowner Direct Plan issuances	496,437
Equity-based compensation plans (Note 9(b))	5,185
Other	(45,847	)
Shares outstanding, September 30, 2017	231,204,360