Alliant Energy Receives Approval to Bring More 'Green' Power to Wisconsin Power and Light Company Customers

200 megawatts of wind energy will help utility move further down path to greener future

Wisconsin Power and Light Company (WPL), a subsidiary of Alliant Energy Corporation (NYSE: LNT), today received approval from the Minnesota Public Utilities Commission (MPUC) to build phase one of the Bent Tree Wind Farm in Freeborn County, Minnesota. This was the final regulatory approval needed by WPL to begin construction.

"We are very pleased with the MPUC's decision today," said Barbara Swan, President-WPL. "The addition of Bent Tree to our wind portfolio helps pave the way for WPL to provide 12% of our retail energy supply from renewable energy sources by 2012, furthering our commitment to finding emissions-free sources of energy that complement our existing baseload generation."

WPL plans to develop approximately 200 megawatts (MW) of emissions-free wind energy on the Bent Tree Wind Farm site - enough energy to power approximately 50,000 homes. The MPUC approval comes three months after the Public Service Commission of Wisconsin (PSCW) approved the plan.

The 200 MW project will cost approximately $425 to $475 million, excluding allowance for funds used during construction, with commercial operation anticipated in 2011.

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. Wisconsin Power and Light, the company's Wisconsin utility subsidiary, serves approximately 450,000 electric and 175,000 natural gas customers. 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 www.alliantenergy.com.

This press release includes forward-looking statements. These forward- looking statements can be identified as such because the statements include words such as approximately, continue, committed, expected, anticipates 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 regulatory actions or local government actions which delay, prevent or alter the proposed plans, including inability to obtain all necessary approvals and permits; unanticipated construction issues, delays or expenditures, including increased costs of labor, materials and equipment; failure of equipment and technology to perform as expected; current or future litigation, regulatory investigations, proceedings or inquiries that could impede the implementation of WPL's plans; political conditions in WPL's service territories; changes to WPL's access to capital markets; and economic conditions in WPL'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 WPL undertake no obligation to update publicly such statements to reflect subsequent events or circumstances.

Source: Alliant Energy Corporation