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, 2003 through March 31, 2003

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, 2003 through March 31, 2003 (the "Reporting Period"):


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


                                                                           
                       January             February              March             Quarter
                   --------------------------------------------------------------------------------
Begin Balance       $   135,500,000      $    55,000,000     $   124,000,000     $   135,500,000
CP Issued           $ 2,283,152,000      $ 1,570,475,000     $ 2,598,000,000     $ 6,451,627,000
CP Matured          $ 2,363,652,000      $ 1,501,475,000     $ 2,687,000,000     $ 6,552,127,000
Ending Balance      $    55,000,000      $   124,000,000     $    35,000,000     $    35,000,000





     1(b). The weighted  average interest rate for the period for all short term
debt was as follows:


                       
        January          1.904%
        February         2.003%
        March            2.000%
        Quarter          1.979%



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


                                                                          
                       January             February              March             Quarter
                   --------------------------------------------------------------------------------
Begin Balance       $    85,000,000      $  259,000,000      $ 168,000,000       $    85,000,000
CP Issued           $ 1,210,000,000      $  254,000,000      $ 620,000,000       $ 2,084,000,000
CP Matured          $(1,036,000,000)     $ (345,000,000)     $(553,000,000)      $(1,934,000,000)
Ending Balance      $   259,000,000      $  168,000,000      $ 235,000,000       $   235,000,000




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


                       
        January          4.545%
        February         4.620%
        March            4.522%
        Quarter          4.529%



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


                                                                        
                       January             February              March             Quarter
                   --------------------------------------------------------------------------------
Begin Balance       $           -        $            -      $    18,000,000     $            -
CP Issued           $           -        $   64,500,000      $   136,500,000     $  201,000,000
CP Matured          $           -        $   46,500,000      $    79,000,000     $  125,500,000
Ending Balance      $           -        $   18,000,000      $    75,500,000     $   75,500,000




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


                       
        January          0.000%
        February         1.466%
        March            1.453%
        Quarter          1.465%


     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        $ 75,500,000      $ 475,500,000      $ 250,000,000
WP&L      (**)      $           0        $ 73,000,000      $  73,000,000      $          NA
SERVICES (***)      $ 119,175,951        $          0      $ 119,175,951      $          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 3.291%.

     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                $  119,175,951        $ 244,824,049     $ 364,000,000      $ 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 2, 2003
         ---------------
                                   ALLIANT ENERGY CORPORATION
                                   INTERSTATE POWER AND LIGHT COMPANY
                                   ALLIANT ENERGY CORPORATE SERVICES INC.

                                   BY:  ALLIANT ENERGY CORPORATION



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