Recent Press Release

Wisconsin Power and Light Company receives interim order in fuel and purchased power cost rate adjustment request

MADISON, WI – April 25, 2008 – Wisconsin Power and Light Company (WPL), a subsidiary of Alliant Energy Corporation (NYSE: LNT) received an interim order yesterday from the Public Service Commission of Wisconsin (PSCW) in the company’s fuel-only rate case. In its order, the PSCW granted WPL authority to increase rates for electric service on an interim basis by $15.6 million (1.58%) annually. The rate change is effective today and will affect virtually all retail electric customers.

WPL filed a fuel-only rate case last month because actual fuel and purchased power costs through February of this year, combined with projections of continued higher fuel and purchased power costs for the remainder of 2008, significantly exceed the amounts currently recovered in base rates.

“Fuel and purchased power costs have proven to be volatile in recent years,” said Barbara Swan, WPL President. “WPL’s ability to recover these prudent costs in a timely manner ensures fairness to customers and shareowners alike.”

The PSCW is expected to hold a public hearing regarding final rate relief as part of its full proceedings on the fuel-only rate case prior to issuing its final order. The interim rate increase will remain in effect until the final order is issued. If the amount collected in interim rates is greater than final rates, customers will receive a refund with interest.

The amount of the interim increase will vary depending on usage and customer class. However, a typical residential customer using 600 kWh of electricity per month will see a monthly increase of approximately 86 cents on their electric bills.

Media Contact: Rob Crain (608) 458-4469
Investor Relations Contact: Jamie Freeman (608) 458-3274