Alliant Energy Corporation Utility Subsidiaries Declare Preferred Stock Dividends

MADISON, Wis., Aug. 15 /PRNewswire-FirstCall/ — Quarterly dividends on preferred stock have been declared by the Board of Directors of Alliant Energy Corporation’s (NYSE:LNT) utility subsidiaries.

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Wisconsin Power and Light Company Preferred Stock Dividends

The Board of Directors of Wisconsin Power and Light Company (WPL) has declared dividends for its preferred stock shareowners of record on August 29, 2008. The dividends, which are payable on September 15, 2008, 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

Interstate Power and Light Company Preferred Stock Dividends

The Board of Directors of Interstate Power and Light Company (IPL) has declared dividends for its preferred stock shareowners of record on August 29, 2008. The dividends, which are payable on September 15, 2008, 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

WPL and IPL are subsidiaries of Alliant Energy Corporation.

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

CONTACT: Media, Rob Crain, +1-608-458-4469, or Investors, Jamie Freeman,
+1-608-458-3274, both of Alliant Energy Corporation

Web site: http://www.alliantenergy.com/