MADISON, Wis., Dec. 9 /PRNewswire-FirstCall/ -- Alliant Energy Corporation (NYSE:LNT) (the "Company") today announced that certain one-time regulatory-related charges are expected to be recorded in the fourth quarter of 2009. The impact of these one-time charges are anticipated to range between $0.10 and $0.15 per share. The charges relate to pre-certification, pre-construction and partner-related costs incurred for Wisconsin Power and Light Company's proposed Nelson Dewey #3 coal plant and Interstate Power and Light Company's ("IPL") proposed Sutherland Generating Station #4 ("Sutherland #4") coal plant. (Logo: http://www.newscom.com/cgi-bin/prnh/20020405/LNTLOGO) Plans to build Nelson Dewey #3 were rejected in the fourth quarter of 2008 and Sutherland #4 plans were cancelled in the first quarter of 2009. The charges are anticipated due, in part, to recent oral regulatory decisions to deny recovery of certain of these costs at Nelson Dewey #3, and an oral decision by the Minnesota Public Utilities Commission and on-going partner negotiations related to Sutherland #4. These charges do not include any impact from the pending IPL rate case. These one-time charges were not anticipated when the Company issued its utility earnings guidance in October 2009. Alliant Energy Corporation is the parent company of two public utility companies - Interstate Power and Light Company and Wisconsin Power and Light Company - and of Alliant Energy Resources, LLC (Resources), the parent company of Alliant Energy's non-regulated operations. Alliant Energy is an energy-services provider with subsidiaries serving approximately 1 million electric and 400,000 natural gas customers. Providing its customers in the Midwest with regulated electricity 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/. This press release contains forward-looking statements which can be identified as such because they include words such as "expected," "anticipated" and words of similar import. Such statements are subject to certain risks and uncertainties that could cause actual results to differ materially from those currently anticipated. Actual results could be affected by such factors as: state or federal regulatory actions, including allowing for, among other things, the recovery of operating costs, capital expenditures and deferred expenditures, including the rate case pending for Interstate Power and Light Company and the release of written orders concerning the charges; successful negotiation with Sutherland Generating Station #4 partners regarding costs; economic and political conditions in IPL's service territory; and current or future litigation, regulatory investigations, proceedings or inquiries. These factors should be considered when evaluating the forward-looking statements and undue reliance should not be placed on such statements. The forward-looking statements included herein are made as of the date hereof and Alliant Energy undertakes no obligation to update publicly such statements to reflect subsequent events or circumstances. http://www.newscom.com/cgi-bin/prnh/20020405/LNTLOGO http://photoarchive.ap.org/ DATASOURCE: Alliant Energy Corporation CONTACT: Media, Scott Reigstad, +1-608-458-3145, or Investors, Susan Gille, +1-608-458-3956, both for Alliant Energy Corporation Web Site: http://www.alliantenergy.com/

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