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
April 1, 2004 through June 30, 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  ("WPL"),  Interstate  Power and Light Company
("IPL"),  and Alliant Energy Corporate  Services,  Inc.( "Services") that during
the period from April 1, 2004 through June 30, 2004 (the "Reporting Period"):

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



                                           
                    April        May        June      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:

      April        -
      May          -
      June         -
      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

                                      -1-

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



                                                                
                     April              May                June              Quarter
               ------------------------------------------------------------------------
Begin Balance   $  122,500,000     $  128,000,000     $  30,000,000     $ 122,500,000
CP Issued       $  344,500,000     $  210,500,000     $ 122,000,000     $ 677,000,000
CP Matured      $  339,000,000     $  308,500,000     $ 131,500,000     $ 779,000,000
Ending Balance  $  128,000,000     $   30,000,000     $  20,500,000     $  20,500,000



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

      April      1.124%
      May        1.128%
      June       1.130%
      Quarter    1.126%

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   $ 149,000,000    $ 149,000,000      $ 250,000,000
WP&L  (**)      $        0   $  74,000,000    $  74,000,000               NA
SERVICES (***)  $  201,425   $           0    $     201,425               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        $  201,425     $       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:    August 3, 2004

                             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