Exhibit 32.1

 Written Statement of the Chief Executive Officer and Chief Financial Officer
                   Pursuant to 18 U.S.C. Section 1350

Solely for the purposes of complying with 18 U.S.C. Section 1350, as adopted
pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, we, the
undersigned Chief Executive Officer and Chief Financial Officer of Alliant
Energy Corporation (the "Company"), hereby certify, based on our knowledge,
that the Quarterly Report on Form 10-Q of the Company for the quarter ended
June 30, 2003 (the "Report") fully complies with the requirements of Section
13(a) of the Securities Exchange Act of 1934 and that information contained
in the Report fairly presents, in all material respects, the financial
condition and results of operations of the Company.




/s/ Erroll B. Davis, Jr.
- ------------------------
Erroll B. Davis, Jr.
Chairman, President and Chief Executive Officer




/s/ Thomas M. Walker
- --------------------
Thomas M. Walker
Executive Vice President and Chief Financial Officer

August 14, 2003