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):              April 21, 2000


                           Alliant Energy Corporation
             ------------------------------------------------------
             (Exact name of registrant as specified in its charter)


   Wisconsin                       1-9894                         39-1380265
- ---------------               ----------------               -------------------
(State or other               (Commission File                  (IRS Employer
jurisdiction of                    Number)                   Identification No.)
incorporation)


              222 West Washington Avenue, Madison, Wisconsin 53703
          ------------------------------------------------------------
          (Address of principal executive offices, including zip code)


                                 (608) 252-3311
                         -------------------------------
                         (Registrant's telephone number)







Item 5.   Other Events.

          On April 21, 2000,  Alliant Energy  Corporation issued a press release
announcing  its earnings for the first  quarter  ended March 31, 2000. A copy of
such press  release is filed as Exhibit  99.1 and is  incorporated  by reference
herein.


Item 7.   Financial Statements and Exhibits.

          (a)  Not applicable.

          (b)  Not applicable.

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

               (99.1)  Alliant Energy Corporation Press Release dated April 21,
                       2000.



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                                   SIGNATURES

          Pursuant to the  requirements of the Securities  Exchange Act of 1934,
the  registrant  has duly  caused  this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                         ALLIANT ENERGY CORPORATION



Date:  May 1, 2000                       By:  /s/ Daniel A. Doyle
                                            ------------------------------------
                                            Daniel A. Doyle
                                            Vice President, Chief Accounting and
                                              Financial Planning Officer



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                           ALLIANT ENERGY CORPORATION

                   Exhibit Index to Current Report on Form 8-K
                              Dated April 21, 2000


Exhibit
Number
- -------

(99.1)            Alliant Energy Corporation Press Release dated April 21, 2000.



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