Common Equity (Tables)

6 Months Ended

Jun. 30, 2018

Stockholders' Equity Note [Abstract]

Common Share Activity

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

Shares outstanding, January 1, 2018	231,348,646
At-the-market offering program	2,144,178
Shareowner Direct Plan issuances	313,429
Equity-based compensation plans (Note 10(b))	5,078
Other	(38,423	)
Shares outstanding, June 30, 2018	233,772,908