WISCONSIN POWER AND LIGHT COMPANY (a Wisconsin corporation) 6.375% DEBENTURES DUE 2037 PURCHASE AGREEMENT Dated: August 8, 2007Purchase Agreement • August 9th, 2007 • Wisconsin Power & Light Co • Electric & other services combined • New York
Wisconsin Power and Light Company, a Wisconsin corporation (the “Company”), confirms its agreement with Banc of America Securities LLC (“Banc of America”), Merrill Lynch & Co., Merrill Lynch, Pierce, Fenner & Smith Incorporated (“Merrill Lynch”), and each of the other underwriters named in Schedule A hereto (collectively, the “Underwriters”, which term shall also include any underwriter substituted as hereinafter provided in Section 10 hereof), for whom Banc of America and Merrill Lynch are acting as representatives (in such capacity, the “Representatives”), with respect to the issue and sale by the Company and the purchase by the Underwriters, acting severally and not jointly, of the respective principal amounts set forth on Schedule A of $300,000,000 aggregate principal amount of the Company’s 6.375% Debentures due 2037 (the “Securities”). The Securities will be issued pursuant to an indenture dated as of June 20, 1997 (the “Base Indenture”) between the Company and U.S. Bank National
