Common Equity (Tables)

6 Months Ended

Jun. 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	392,906
Equity-based compensation plans (Note 9(b))	22,408
Shares outstanding, June 30, 2016	227,333,746