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):   February 4, 2003


                          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)


                4902 N. Biltmore Lane, Madison, Wisconsin 53718
         ------------------------------------------------------------
         (Address of principal executive offices, including zip code)


                                 (608) 458-3311
                        -------------------------------
                        (Registrant's telephone number)





Item 7.    Financial Statements and Exhibits.
------     ---------------------------------

           (a)   Not applicable.

           (b)   Not applicable.

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

                 (99.1)  Alliant  Energy   Corporation   Press  Release  dated
                         February 4, 2003.

Item 9.    Regulation FD Disclosure.
------     ------------------------

           On  February  4, 2003,  Alliant  Energy  Corporation  issued a press
release  announcing  its  earnings  for  the  fourth  quarter  and  year  ended
December 31,  2002.  A copy of such press  release is furnished as Exhibit 99.1
and is incorporated by reference herein.

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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:  February 4, 2003       By: /s/ John E. Kratchmer
                                  -----------------------------------
                                  John E. Kratchmer
                                    Vice President-Controller and
                                    Chief Accounting Officer



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                          ALLIANT ENERGY CORPORATION

                  Exhibit Index to Current Report on Form 8-K
                            Dated February 4, 2003


Exhibit
Number
------

(99.1)     Alliant Energy Corporation Press Release dated February 4, 2003.



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