Exhibit 99.1

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Alliant Energy Corporation

Corporate Headquarters

4902 North Biltmore Lane

Suite 1000

Madison, WI 53718-2148

www.alliantenergy.com

News Release

FOR IMMEDIATE RELEASE    Media Contact:    Scott Reigstad (608) 458-3145
   Investor Relations:    Susan Gille (608) 458-3956

ALLIANT ENERGY ANNOUNCES 2010 RESULTS

MADISON, Wis. – February 10, 2011 – Alliant Energy Corporation (NYSE: LNT) today announced U.S. generally accepted accounting principles (GAAP) and non-GAAP consolidated earnings from continuing operations for 2010 and 2009 as follows:

 

     2010      2009  

Adjusted (non-GAAP) Operating Results from Continuing Operations:

     

Net Income ($ millions)

   $ 304.7       $ 213.7   

Earnings per share (EPS)

   $ 2.75       $ 1.95   

GAAP Earnings from Continuing Operations:

     

Net Income ($ millions)

   $ 289.3       $ 110.1   

Earnings per share (EPS)

   $ 2.62       $ 1.00   

Alliant Energy’s 2010 non-GAAP EPS from continuing operations were $2.75 per share, which was $0.80 per share higher than non-GAAP EPS from continuing operations for 2009. Earnings for Alliant Energy’s utility business were positively impacted by higher revenues due to retail rate increases and warmer weather in the summer of 2010 compared to the summer of 2009. The positive EPS drivers were partially offset by higher transmission service expense, higher incentive-related compensation costs, higher depreciation and operating expenses due to placing the Whispering Willow – East wind project in service in late 2009 and lower allowance for funds used during construction (AFUDC) due to lower wind construction work in progress balances.

“2010 was a challenging but successful year,” said Bill Harvey, Alliant Energy Chairman and CEO. “We completed two rate cases, in Iowa and Wisconsin, and made progress on a third case in Minnesota. In 2011, we expect to continue to see the earnings benefit of our rate base growth initiatives, while at the same time we anticipate the cost management plan in Iowa, and cost controls across the service territory, will help ensure we provide competitive rates to our customers.”

2010 non-GAAP EPS excludes net losses of $0.13 per share from adjustments consisting of regulatory-related charges and credits, healthcare legislation charges, restructuring and impairment charges and gains related to completion of federal income tax audits and a depreciation adjustment. 2009 non-GAAP EPS excludes net losses of $0.95 per share from adjustments consisting of a $1.16 per share charge from Alliant Energy’s tender offer for its exchangeable senior notes, proposed coal plant charges, restructuring and impairment charges and gains related to non-recurring state income tax impacts and regulatory-related credits. These adjustments, which relate to significant charges or gains that are not normally associated with ongoing operations, are provided as a supplement to results reported in accordance with GAAP. Adjusted, or non-GAAP, operating earnings for 2010 and 2009 do not include the following items (after tax) that were included in the reported GAAP earnings:

 

Page 1 of 11


The following information was filed by Alliant Energy Corp (LNT) on Thursday, February 10, 2011 as an 8K 2.02 statement, which is an earnings press release pertaining to results of operations and financial condition. It may be helpful to assess the quality of management by comparing the information in the press release to the information in the accompanying 10-K Annual Report statement of earnings and operation as management may choose to highlight particular information in the press release.

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