INTERSTATE POWER AND LIGHT COMPANY (an Iowa corporation) 7.25% SENIOR DEBENTURES DUE 2018 PURCHASE AGREEMENT Dated: October 1, 2008Interstate Power and Light Company • October 2nd, 2008 • Alliant Energy Corp • Electric & other services combined • New York
Interstate Power and Light Company, an Iowa corporation (the “Company”), confirms its agreement with Barclays Capital Inc. (“Barclays”), Citigroup Global Markets Inc. (“Citi”) and J.P. Morgan Securities Inc. (“J.P. Morgan”), 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 Barclays, Citi and J.P. Morgan 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 $250,000,000 aggregate principal amount of the Company’s 7.25% Senior Debentures due 2018 (the “Securities”). The Securities will be issued pursuant to an indenture dated as of August 20, 2003 (the “Base Indenture”) between the Company and The Bank of New York Mellon Trust C
WISCONSIN POWER AND LIGHT COMPANY (a Wisconsin corporation) 7.60% DEBENTURES DUE 2038 PURCHASE AGREEMENT Dated: October 1, 2008Purchase Agreement • October 2nd, 2008 • Alliant Energy Corp • Electric & other services combined • New York
Wisconsin Power and Light Company, a Wisconsin corporation (the “Company”), confirms its agreement with Barclays Capital Inc. (“Barclays”), Citigroup Global Markets Inc. (“Citi”) and J.P. Morgan Securities Inc. (“J.P. Morgan”), 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 Barclays, Citi and J.P. Morgan 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 $250,000,000 aggregate principal amount of the Company’s 7.60% Debentures due 2038 (the “Securities”). The Securities will be issued pursuant to an indenture dated as of June 20, 1997 (the “Base Indenture”) between the Company and Wells Fargo Bank, National Association, a
