Common Equity (Tables)

9 Months Ended

Sep. 30, 2016

Stockholders' Equity Note [Abstract]

Common Share Activity

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

Shares outstanding, January 1, 2016	226,918,432
Shareowner Direct Plan issuances	559,588
Equity-based compensation plans (Note 9(b))	22,408
Shares outstanding, September 30, 2016	227,500,428