form10k123109exh21pt1.htm

EX-21.1 9 form10k123109exh21pt1.htm FORM 10-K 12/31/09 EXHIBIT 21.1 form10k123109exh21pt1.htm

EXHIBIT 21.1

ALLIANT ENERGY CORPORATION

SUBSIDIARIES OF THE REGISTRANT

The following are deemed to be significant subsidiaries of Alliant Energy Corporation as of Dec. 31, 2009:

Name of Subsidiary		State of Incorporation

Interstate Power and Light Company		Iowa

Wisconsin Power and Light Company		Wisconsin