Webcast Alert: Alliant Energy Corporation Annual Meeting of Shareowners

MADISON, Wis., May 14 /PRNewswire-FirstCall/ — In conjunction with Alliant Energy Corporation’s (NYSE:LNT) Annual Meeting of Shareowners, you are invited to view and listen to its annual meeting that will be broadcast live over the Internet on Thursday, May 15, 2008 at 1:00 p.m. CT. Bill Harvey, Chairman, President and CEO of Alliant Energy Corporation will preside.

  What:      Alliant Energy Corporation Annual Meeting of Shareowners

  When:      Thursday, May 15, 2008 at 1:00 p.m. CT
  Where:     http://www.alliantenergy.com/investors

             Or http://www.vcall.com/IC/CEPage.asp?ID=126942
  How:       Live over the Internet — Simply log on to the web at the

             address above.

Alliant Energy Corporation is an energy-services provider with subsidiaries serving approximately 1 million electric and over 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/.

Minimum Requirements to listen to broadcast:

Internet Explorer v6.0 or higher, at least a 56 Kbps connection to the Internet and Microsoft Windows Media Player software v7.0 or higher, downloadable free from: http://www.microsoft.com/windows/windowsmedia/player/11/default.aspx.

(Logo: http://www.newscom.com/cgi-bin/prnh/20020405/LNTLOGO)

First Call Analyst:
FCMN Contact:

Source: Alliant Energy Corporation

CONTACT: media, Rob Crain, +1-608-458-4469, or investors, Jamie Freeman,
+1-608-458-3274, both of Alliant Energy Corporation

Web site: http://www.alliantenergy.com/