Press Release

Alliant Energy Corporation announces expiration of tender offer for the exchangeable senior notes due 2030

Madison, Wis. – October 16, 2009 – Alliant Energy Corporation (NYSE:LNT) announced today the expiration of its previously announced cash tender offer and consent solicitation for any and all of the outstanding Exchangeable Senior Notes due 2030 (the “Notes”) (CUSIP Nos. 018803403, 018803205 and 018803304).  The offer expired as of 5:00 p.m., New York City time, on October 15, 2009.  As of the expiration date, Alliant Energy had received valid tenders and consents from holders of $402,479,715 aggregate principal amount of Notes (or 5,940,660 Notes), representing 99.99% of the $402,500,040 aggregate principal amount of Notes (or 5,940,960 Notes) outstanding prior to the tender offer. 

Alliant Energy has previously made payment of $238,775,679 for $402,344,215 aggregate principal amount of Notes (or 5,938,660 Notes) tendered prior to the September 28, 2009 early tender date.  Holders who validly tendered their Notes after the early tender date and prior to the expiration date of the tender offer will receive total consideration of $40.00 per Note plus accrued and unpaid interest from the last payment date to, but not including, the settlement date.  Alliant Energy expects to make payment today, October 16, 2009 for such Notes.

Following the tender offer, there will be a total of $20,325 aggregate principal amount of Notes (or 300 Notes) outstanding.

Citi served as the dealer manager and Global Bondholder Services Corporation served as the information agent and the depositary for the tender offer and the consent solicitation.

 
This release is for informational purposes only and is neither an offer to purchase, a solicitation of an offer to sell, or a solicitation of consents with respect to, the Notes, nor a recommendation regarding the tender offer and/or consent solicitation. The tender offer and the consent solicitation were made upon the terms and subject to the conditions set forth in the Offer to Purchase and Consent Solicitation Statement dated September 16, 2009 and related Letter of Transmittal and Consent, each as amended by Alliant Energy’s press release dated September 29, 2009. 

Media Contact:  Rob Crain, (608) 458-4469
Investor Relations:  Susan Gille, (608) 458-3956