Consent of Independent Public Accountants As independent public accountants, we hereby consent to the incorporation by reference in this registration statement of our reports on the Alliant Energy Corporation financial statements and schedules, dated January 25, 2002, included in the Alliant Energy Corporation Form 10-K for the year ended December 31, 2001, and to all references to our firm included in this registration statement on Form S-8. /s/ Arthur Andersen LLP ARTHUR ANDERSEN LLP Milwaukee, Wisconsin May 14, 2002