FILER:

COMPANY DATA:
COMPANY CONFORMED NAME:                 ALLIANT ENERGY CORPORATION
CENTRAL INDEX KEY:
STANDARD INDUSTRIAL CLASSIFICATION:     ELECTRIC AND OTHER SERVICES COMB. [4931]
IRS NUMBER:                             391380265
STATE OF INCORPORATION:                 WI
FISCAL YEAR END:                        12/31

FILING VALUES:
FORM TYPE:                              35-CERT
SEC ACT:
SEC FILE NUMBER:                        070-10052
FILM NUMBER:

BUSINESS ADDRESS:
STREET 1:                               4902 N Biltmore Lane
CITY:                                   MADISON
STATE:                                  WI
ZIP:                                    53718
BUSINESS PHONE:                         608-458-3311

MAILING ADDRESS
STREET 1:                               P. O. BOX  77007
CITY:                                   MADISON
STATE:                                  WI
ZIP:                                    53707






                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington D. C. 20549

PUBLIC UTILITY HOLDING COMPANY ACT OF 1935
File No. 70-10052

REPORT PERIOD
January 1, 2004 through March 31, 2004

In the Matter of

ALLIANT ENERGY CORPORATION, ET AL

     ALLIANT ENERGY  CORPORATION  ("AEC") hereby certifies on behalf of itself ,
Wisconsin Power and Light Company,  Interstate  Power and Light Company ("IPL"),
and Alliant Energy Corporate Services,  Inc.( "Services") that during the period
from January 1, 2004 through March 31, 2004 (the "Reporting Period"):


1(a). Alliant Energy Corporation issued commercial paper as follows:


                                                   
                  January        February        March        Quarter
               ----------------------------------------------------------
Begin Balance    $     0         $     0        $     0       $     0
CP Issued        $     0         $     0        $     0       $     0
CP Matured       $     0         $     0        $     0       $     0
Ending Balance   $     0         $     0        $     0       $     0



1(b).Weighted  Average for the interest rate for the period for short-term  debt
was as follows:


                     
           January       -
           February      -
           March         -
           Quarter       -
 

1(c). Alliant Energy Corporation borrowed from Banks as follows:

           N/A

1(d).The  weighted  average interest rate for the period for the bank borrowings
was as follows:

           N/A

2(a). Interstate Power and Light Company issued commercial paper as follows:


                                                       
                 January          February          March          Quarter
               ----------------------------------------------------------------
Begin Balance    $ 107,500,000   $ 129,000,000    $ 139,500,000   $ 107,500,000
CP Issued        $ 276,500,000   $ 219,500,000    $ 163,500,000   $ 659,500,000
CP Matured       $ 255,000,000   $ 209,000,000    $ 180,500,000   $ 644,500,000
Ending Balance   $ 129,000,000   $ 139,500,000    $ 122,500,000   $ 122,500,000


2(b).  Weighted Average for the interest rate for the period for short-term debt
was as follows:


                     
           January      1.165%
           February     1.133%
           March        1.122%
           Quarter      1.140%


3(a). For each of the companies  participating  in the Utility Money Pool during
the Reporting  Period,  the maximum  principal  amount of short-term  borrowings
outstanding  from the Utility  Money Pool,  sources other than the Utility Money
Pool,  and the  maximum  total  short-term  borrowings  outstanding  during  the
Reporting Period,  and the Securities and Exchange  Commission ("SEC") borrowing
limit  for  each  participant  as of the  end of the  Reporting  Period  were as
follows:



                                                    
                              Maximum
               Maximum        Other           Maximum
               Money Pool     Short-Term       Total             SEC
Company        Borrowings     Borrowings      Borrowings         Limit

IPL (*)         $        0     $ 141,500,000  $ 141,500,000    $  250,000,000
WP&L     (**)   $        0     $  21,000,000  $  21,000,000             NA
SERVICES (***)  $  905,637     $           0  $     905,637             NA


     (*)  IPL ceased borrowing from the Money Pool as of October 11, 2002.

     (**) All borrowings by WP&L from the Money Pool are exempt under Rule 52(a)
          and  are  shown  here  for  information   purposes  only.  WPL  ceased
          borrowings from the Money Pool as of July 25, 2002.

     (***)Borrowings  by Services are exempt under Rule 52(b) and are shown here
          for information purposes only.

4.  During  the  Reporting  Period,  the  weighted  average  interest  rate  for
borrowings through the Money Pool was .99%.

5. The maximum amount of AEC's short-term borrowings on behalf of itself and the
above named  participants in the Utility Money Pool during the Reporting Period,
and its SEC limit as of the end of the Reporting Period, were as follows:



             Maximum         Maximum         Maximum
             Loans to        Corporate       Short-Term       SEC
             Money Pool      Borrowings      Borrowings       Limit
                                                  
AEC        $  905,637       $       0        $       0       $ 1,000,000,000


________________

     Said  transactions  have been carried out in accordance  with the terms and
conditions   of,   and  for  the   purpose   represented   in,   the   Form  U-1
Application-Declaration,  as amended,  of AEC, et al, in File  70-10052,  and in
accordance  with the terms and conditions of the SEC's order dated June 21,2002,
permitting said Application-Declaration to become effective.




        DATED:  May 10, 2004

                                   ALLIANT ENERGY CORPORATION
                                   INTERSTATE POWER AND LIGHT COMPANY
                                   ALLIANT ENERGY CORPORATE SERVICES INC.

                                   BY:  ALLIANT ENERGY CORPORATION


                                    /s/ Thomas L Hanson
                            BY:  ------------------------------------------
                                   Thomas L. Hanson
                                   Vice President, Treasurer