Iowa Utilities Board Reschedules Ratemaking Hearings on Proposed Sutherland Generating Station Unit 4

Iowa Utilities Board Reschedules Ratemaking Hearings on Proposed Sutherland Generating Station Unit 4

		Alliant Energy is the parent company of two public utility companies--Interstate Power and Light Company (IPL) and Wisconsin Power and Light Company (WPL)--and of Alliant Energy Resources, Inc. (AER), the parent company of Alliant Energy's non-regulated operations. (PRNewsFoto/ALLIANT ENERGY CORPORATION) MADISON, WI UNITED STATES

IUB also streamlines other elements to expedite process CEDAR RAPIDS, Iowa, Sept. 29 /PRNewswire-FirstCall/ -- Interstate Power and Light Company (IPL), a subsidiary of Alliant Energy Corporation (NYSE: LNT), indicated today that the Iowa Utilities Board (IUB) has rescheduled its ratemaking principles hearings related to IPL's proposed Sutherland Generating Station Unit 4 from October 6, 2008 to December 1, 2008. The change allows the Iowa Office of Consumer Advocate and other interveners additional time to analyze filings made by IPL on September 12, 2008, which responded to the IUB's request for additional information and updated the cost estimate of the project. (Logo: http://www.newscom.com/cgi-bin/prnh/20020405/LNTLOGO) "We expect the change in the IUB ratemaking hearing schedule will not significantly impact our plans to begin construction of the Sutherland Generating Station Unit 4 in the first quarter of 2009," states Tom Aller, President-IPL. "Our company recently submitted updated information on load forecasts and operational and financial models that are a part of this ratemaking principles proceeding. That information further confirms our case as to why we believe Sutherland Generating Station Unit 4 is in the best interest of our customers, partners and Iowa. While we anxiously await the opportunity to further discuss our plans for Sutherland Generating Station Unit 4, we respect the IUB's decision to reschedule and appreciate their efforts to expedite the process." As part of the change in the hearing schedule, the IUB also streamlined the timing of other elements of the docket in an effort to expedite the process as much as possible. IPL expects an IUB decision on the ratemaking principles during the first quarter of 2009. Iowa statute requires the IUB to issue a ruling on ratemaking principles that are to be applicable for any baseload generating facility over 300 megawatts. Ratemaking principles define how construction costs will be recovered in utility rates throughout the life of the generating facility. IPL received the IUB's written approval of the Sutherland Generating Station Unit 4's siting application in August 2008. Approval of both the siting application and ratemaking principles application are necessary before construction begins. IPL also expects a decision on its Sutherland Generating Station Unit 4 air permit application from the Iowa Department of Natural Resources by the end of 2008 or early 2009. About Alliant Energy 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 electric and natural gas service is the company's primary focus. Interstate Power and Light, the company's Iowa and Minnesota utility subsidiary, serves approximately 530,000 electric and 235,000 natural gas customers. Alliant Energy 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. These forward-looking statements can be identified as such because the statements include words such as "expects," "believe" or other words of similar import. Similarly, statements that describe future plans or strategies are also forward-looking statements. 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 or local government actions, including inability to obtain all necessary approvals and permits; unanticipated construction issues, delays or expenditures; current or future litigation, regulatory investigations, proceedings or inquiries that could impede the implementation of the IPL's plans; failure of equipment and technology to perform as expected; the inability to find partners for co-ownership of Sutherland Generating Station Unit 4 or partners to enter into purchased power arrangements of output of Sutherland #4; changes to IPL's access to capital markets; political conditions in IPL's service territories; and economic conditions in IPL's service territory. 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 and IPL undertake no obligation to update publicly such statements to reflect subsequent events or circumstances. ANR400-08