EX-21 5 form10k123103exh21.htm EXHIBIT 21 Form 10-K 12/31/03 Exhibit 21

EXHIBIT 21

ALLIANT ENERGY CORPORATION
SUBSIDIARIES OF THE REGISTRANT

The following are deemed to be significant subsidiaries of Alliant Energy Corporation as of Dec. 31, 2003:

Name of Subsidiary State of Incorporation
 
Interstate Power and Light Company Iowa
 
Wisconsin Power and Light Company Wisconsin
 
Alliant Energy Resources, Inc. Wisconsin
 
       Alliant Energy International, Inc. Iowa
 
       Alliant Energy Investments, Inc. Iowa