[ALLIANT ENERGY LOGO]


                                                        Alliant Energy
                                                        Worldwide Headquarters
                                                        4902 North Biltmore Lane
                                                        P.O. Box 77007
                                                        Madison, WI  53707-1007
                                                        www.alliantenergy.com


News Release
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FOR IMMEDIATE RELEASE         Media Contacts:    Chris Schoenherr (608) 458-3924
                                                    Karen Whitmer (608) 458-4839
                              Investor Relations:       Eric Mott (608) 458-3391


ALLIANT ENERGY CFO ANNOUNCES RESIGNATION


MADISON, Wis.--August 28, 2003-- Alliant Energy Corp. (NYSE: LNT) today
announced its chief financial officer, Thomas M. Walker, has resigned to pursue
other business opportunities. The company named Eliot G. Protsch, executive vice
president - Energy Delivery and president, Interstate Power and Light to serve
as interim CFO, effective September 1, 2003.

"I want to personally thank Tom for his dedication and service throughout his
tenure here at Alliant Energy, particularly as we have successfully executed the
strategic actions we announced last November," said Erroll B. Davis, Jr.,
chairman, president and CEO of Alliant Energy. "We wish Tom the best as he moves
on to his next challenge."

Davis added that the company was fortunate that Eliot Protsch, an experienced
executive with a strong financial background, was able to step in and fill the
role of interim CFO until a permanent successor is named. Protsch will remain
president of Interstate Power and Light.

"We anticipate a smooth transition as Eliot assumes his new role and we select a
replacement in the coming weeks to assume Eliot's current energy delivery
operational responsibilities in the interim," said Davis

Alliant Energy is an energy-services provider that serves more than three
million customers worldwide. Providing its regulated customers in the Midwest
with electricity and natural gas service remains the company's primary focus.
Other key business platforms include the international energy market and
non-regulated domestic generation. 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.


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ANR-140-03