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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
 
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d) of
the Securities Exchange Act of 1934
 
Date of Report (Date of earliest event reported): March 17, 2009
         
        IRS Employer
Commission   Name of Registrant, State of Incorporation, Address of   Identification
File Number   Principal Executive Offices and Telephone Number   Number
         
1-9894   Alliant Energy Corporation   39-1380265
    (a Wisconsin corporation)    
    4902 N. Biltmore Lane    
    Madison, Wisconsin 53718    
    Telephone (608) 458-3311    
         
0-4117-1   Interstate Power and Light Company   42-0331370
    (an Iowa corporation)    
    Alliant Energy Tower    
    Cedar Rapids, Iowa 52401    
    Telephone (319) 786-4411    
This combined Form 8-K is separately furnished by Alliant Energy Corporation and Interstate Power and Light Company.
 
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
o   Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
 
o   Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
 
o   Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
 
o   Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
 
 

 


 

Item 7.01. Regulation FD Disclosure
     On March 17, 2009, Interstate Power and Light Company (“IPL”) filed a retail electric rate case with the Iowa Utilities Board (“IUB”). A summary of certain provisions of that filing can be found posted to Alliant Energy Corporation’s website at www.alliantenergy.com and furnished as Exhibit 99.1 hereto. The full testimony of the filing will be available on the IUB’s website at www.state.ia.us/government/com/util/.
Item 9.01. Financial Statements and Exhibits.
  (a)   Not applicable.
 
  (b)   Not applicable.
 
  (c)   Not applicable.
 
  (d)   Exhibits. The following exhibit is being furnished herewith:
 
      (99.1) Summary of Interstate Power and Light Company’s Retail Electric Rate Case Filing
Forward –Looking Statements
This Current Report on Form 8-K includes forward-looking statements. These forward-looking statements can be identified as such because the statements include words such as “proposing,” “anticipated” or other words of similar import. Similarly, statements that describe expected outcomes in the rate case filed with the IUB are forward-looking. Such statements are subject to certain risks and uncertainties that could cause actual results to differ materially from those currently anticipated. Actual results could be affected by the following factors, among others:
— state regulatory or governmental actions, and future regulatory proceedings, including regulatory decisions regarding IPL’s proposed rate increase;
— IPL’s ability to obtain adequate and timely rate relief to allow for, among other things, the recovery of operating costs, capital expenditures and deferred expenditures, the earning of reasonable rates of return and the payment of expected levels of dividends;
— economic and political conditions in IPL’s service territory; and
— the impact fuel and fuel-related prices and the effectiveness of continued cost control efforts and operating efficiencies.
These factors should be considered when evaluating the forward-looking statements and undue reliance should not be placed on such statements. The forward-looking statements included herein are made as of the date hereof and Alliant Energy and IPL undertake no obligation to update publicly such statements to reflect subsequent events or circumstances.

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SIGNATURES
     Pursuant to the requirements of the Securities Exchange Act of 1934, Alliant Energy Corporation and Interstate Power and Light Company have each duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
         
  ALLIANT ENERGY CORPORATION
 
 
Date: March 17, 2009  By:   /s/ Patricia L. Kampling    
    Patricia L. Kampling   
    Vice President - Chief Financial Officer and
Treasurer 
 
 
  INTERSTATE POWER AND LIGHT COMPANY
 
 
Date: March 17, 2009  By:   /s/ Patricia L. Kampling    
    Patricia L. Kampling   
    Vice President - Chief Financial Officer and
Treasurer 
 
 

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EXHIBIT INDEX
     
Exhibit No.   Description
99.1
  Summary of Interstate Power and Light Company’s Retail Electric Rate Case Filing

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