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 Annual  Report on Form 10-K of the Company for the year ended  December
31, 2002 (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
March 25, 2003