Wisconsin Power and Light Company Announces Pricing of $250M Debt Offering

Wisconsin Power and Light Company ("WPL"), a subsidiary of Alliant Energy Corporation

, has priced a public offering of $250,000,000 aggregate principal amount of debentures. The debentures have an interest rate of 2.25% and will be due on November 15, 2022. WPL intends to apply the approximately $247.1 million in net proceeds from this offering to fund a portion of the purchase price of the Riverside Energy Center on or before December 31, 2012. The remainder of the purchase price is expected to be funded by an equity contribution of approximately $100 million from WPL's parent, Alliant Energy Corporation, and approximately $50 million from the proceeds from WPL issuing commercial paper. WPL may invest the net proceeds from this offering in short-term, high-quality instruments pending the funding of the Riverside Energy Center purchase. The offering was marketed through a group of underwriters, including Citigroup Global Markets Inc., Merrill Lynch, Pierce, Fenner & Smith Incorporated and Mitsubishi UFJ Securities (USA), Inc., as joint book-running managers. The offering is being made only by means of a prospectus supplement and accompanying prospectus, which are part of an automatic shelf registration statement WPL filed with the Securities and Exchange Commission, copies of which may be obtained from Citigroup Global Markets Inc. by calling 1-800-831-9146, from Merrill Lynch, Pierce, Fenner & Smith by calling 1-800-294-1322 or from Mitsubishi UFJ Securities (USA), Inc. by calling 877-649-6848. An electronic copy of the prospectus supplement and accompanying prospectus will be available from the Securities and Exchange Commission's website at www.sec.gov.