WISCONSIN POWER AND LIGHT COMPANY (a Wisconsin corporation) 3.000% DEBENTURES DUE 2029 UNDERWRITING AGREEMENT Dated: June 17, 2019Underwriting Agreement • June 24th, 2019 • 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., Mizuho Securities USA LLC, MUFG Securities Americas Inc. and Wells Fargo Securities, LLC, 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 Capital Inc., Mizuho Securities USA LLC, MUFG Securities Americas Inc. and Wells Fargo Securities, LLC 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 $350,000,000 aggregate principal amount of the Company’s 3.000% Debentures due 2029 (the “Securities”). The Securities will be issued pursuant to an indenture dated as of June 20, 1997 (the “Base Indent
