Alliant Energy Corporation Declares Common Stock Dividends

251st consecutive quarter of common stock dividend payouts

MADISON, Wis., July 15 /PRNewswire-FirstCall/ — Alliant Energy Corporation (NYSE:LNT) announced today that quarterly dividends on common stock were declared by the Board of Directors.

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The common stock dividend is $0.3500 per share payable August 15, 2008, to shareowners of record on July 31, 2008.

Dividends on common stock have been paid for 251 consecutive quarters since 1946.

Alliant Energy is an energy-services provider with subsidiaries serving approximately 1 million electric and over 400,000 natural gas customers. Providing its customers in the Midwest with regulated electric and natural gas service is the company’s primary focus. Alliant Energy, headquartered in Madison, Wis., is a Fortune 1000 company traded on the New York Stock Exchange under the symbol LNT. For more information, visit the company’s Web site at http://www.alliantenergy.com/.

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Source: Alliant Energy Corporation