8-K

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 13, 2008

Commission File Number	Name of Registrant, State of Incorporation, Address of Principal Executive Offices and Telephone Number	IRS Employer Identification Number
1-9894	Alliant Energy Corporation	39-1380265
	(a Wisconsin corporation)
	4902 N. Biltmore Lane
	Madison, Wisconsin 53718
	Telephone (608) 458-3311
0-337	Wisconsin Power and Light Company	39-0714890
	(a Wisconsin corporation)
	4902 N. Biltmore Lane
	Madison, Wisconsin 53718
	Telephone (608) 458-3311

This combined Form 8-K is separately filed by Alliant Energy Corporation and Wisconsin 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:

[   ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

[   ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

[   ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

[   ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 8.01. Other Events.

        On March 13, 2008, Wisconsin Power and Light Company (“WPL”), a wholly owned subsidiary of Alliant Energy Corporation, issued a press release announcing that it has received a notice of intent to sue from the Sierra Club of Wisconsin. The notice claims that WPL did not file its application for renewal of an air permit at the Columbia Energy Center in Portage, Wisconsin with the Wisconsin Department of Natural Resources on a timely basis, and alleges that WPL is currently operating the Columbia Energy Center without the necessary air permit. A copy of the press release is furnished as Exhibit 99.1 and is incorporated by reference herein.

Item 9.01. Financial Statements and Exhibits.

(a) Not applicable.

(b) Not applicable.

(c) Not applicable.

(d) Exhibits. The following exhibit is being filed herewith:

(99.1) Wisconsin Power and Light Company Press Release dated March 13, 2008.

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SIGNATURES

        Pursuant to the requirements of the Securities Exchange Act of 1934, Alliant Energy Corporation and Wisconsin 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 14, 2008	By:  /s/ Barbara J. Swan
	Barbara J. Swan
	Executive Vice President and General Counsel
Date:  March 14, 2008	WISCONSIN POWER AND LIGHT COMPANY
	By:  /s/ Barbara J. Swan
	Barbara J. Swan
	President

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ALLIANT ENERGY CORPORATION
WISCONSIN POWER AND LIGHT COMPANY

Exhibit Index to Current Report on Form 8-K
Dated March 13, 2008

Exhibit No. Description

(99.1) Wisconsin Power and Light Company Press Release dated March 13, 2008.

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EX-99.1

Wisconsin Power and Light Company
An Alliant Energy Company
Corporate Headquarters
4902 North Biltmore Lane
P.O. Box 77007
Madison, WI 53707-1007
www.alliantenergy.com

News Release
FOR IMMEDIATE RELEASE	Media Contact: Rob Crain (608) 458-4469
	Investor Relations: Jamie Freeman (608) 458-3274

Wisconsin Power and Light Company receives notice of intent to sue

MADISON, WI – March 13, 2008 – Wisconsin Power and Light Company (WPL), a subsidiary of Alliant Energy Corporation (NYSE: LNT), has received a notice of intent to sue, on behalf of the Sierra Club of Wisconsin.

The notice claims that WPL did not file its application for renewal of an air permit at the Columbia Energy Center in Portage, Wisconsin with the Wisconsin Department of Natural Resources (WDNR) on a timely basis, and alleges that WPL is currently operating Columbia Energy Center without the necessary air permit. 

WPL continues to review the situation, but does not anticipate any material impacts to ongoing operations at the Columbia Energy Center. WPL is cooperating with the WDNR in the air permit renewal process.

The Columbia Energy Center is a 1,023 megawatt generating facility, located in Portage, Wisconsin. The facility is operated by WPL, and owned jointly by WPL, Wisconsin Public Service Corporation, and Madison Gas and Electric.

Alliant Energy is an energy-services provider with subsidiaries serving approximately 1 million electric and 400,000 natural gas customers. Providing its customers in the Midwest with regulated electric and natural gas service is the company’s primary focus. Wisconsin Power and Light, the company’s Wisconsin utility subsidiary, serves approximately 450,000 electric and 175,000 natural gas customers.  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.

This press release includes forward-looking statements. These forward-looking statements can be identified as such because the statements include the word “anticipate.” 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 or federal regulatory actions or local government actions, including inability to obtain all necessary approvals and permits current or future litigation, regulatory investigations, proceedings or inquiries. 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 WPL undertake no obligation to update publicly such statements to reflect subsequent events or circumstances.

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ANR 97-08