Exhibit 99.4

 Written Statement of the Executive Vice President 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, I, the
undersigned Executive Vice President and Chief Financial Officer of Interstate
Power and Light Company (the "Company"), hereby certify, based on my knowledge,
that the Quarterly Report on Form 10-Q of the Company for the quarter ended
March 31, 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/ Thomas M. Walker
--------------------
Thomas M. Walker
May 15, 2003

A signed original of this written statement required by Section 906 has been
provided to the Company and will be retained by the Company and furnished to
the Securities and Exchange Commission or its staff upon request.