Alliant Energy Corporation Utility Subsidiaries Declare Preferred Stock Dividends

Quarterly dividends on preferred stock have been declared by the Board of Directors of Alliant Energy Corporation's LNT utility subsidiaries. The Board of Directors of Wisconsin Power and Light Company (WPL) has declared dividends for its preferred stock shareowners of record on November 30, 2010. The dividends, which are payable on December 15, 2010, are as follows: $1.10 per share on the 4.40% series $1.125 per share on the 4.50% series $1.19 per share on the 4.76% series $1.20 per share on the 4.80% series $1.24 per share on the 4.96% series $1.55 per share on the 6.20% series $0.40625 per share on the 6.50% series The Board of Directors of Interstate Power and Light Company (IPL) has declared dividends for its preferred stock shareowners of record on November 30, 2010. The dividends, which are payable on December 15, 2010, are as follows: $0.523438 per share on the 8.375% Series B Cumulative Preferred Stock $0.443750 per share on the 7.10% Series C Cumulative Preferred Stock