CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by reference in this Registration Statement on Form S-3 of our report dated March 1, 2006, relating to the consolidated financial statements and financial statement schedule of Interstate Power and Light Company, appearing in the Annual Report on Form 10-K of Interstate Power and Light Company for the year ended December 31, 2005 and to the reference to us under the heading “Experts” in the Prospectus, which is part of this Registration Statement.
/s/ Deloitte & Touche LLP
Milwaukee, Wisconsin
September 7, 2006