SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


*********************************************
In the Matter of  
Alliant Energy Corporation, et al.                      CERTIFICATE
File No. 70-9891                                        PURSUANT TO
(Public Utility Holding Company Act of 1935)            RULE 24
*********************************************






     This Certificate of Notification  (the  "Certificate")  is filed by Alliant
Energy Corporation  ("Alliant  Energy"),  a registered holding company under the
Public  Utility  Holding  Company Act of 1935,  as amended (the "Act"),  and its
wholly-owned  subsidiary,  Alliant  Energy  Resources,  Inc.  ("Resources"),  in
connection    with    the    transactions    proposed    in   the    Form    U-1
Application-Declaration (the "Application-Declaration"),  as amended, of Alliant
Energy and Resources (collectively, the "Applicants") in File No. 70-9891. These
transactions were authorized by order of the Securities and Exchange  Commission
(the  "Commission")  dated  October  3, 2001 (the  "Order"),  as  amended.  

     This  Certificate is for the period covering October 1, 2004 - December 31,
2004 (hereinafter referred to as the "period").

     The Applicants  hereby certify the matters set forth below pursuant to Rule
24 of the rules under the Act:

1.   A computation in accordance with rule 53(a) setting forth Alliant  Energy's
     "aggregate  investment" in all EWGs and FUCOs, its  "consolidated  retained
     earnings" and a  calculation  of the amount  remaining  under the Requested
     EWG/FUCO Investment Authority.
 
     ANSWER:

     See  attached Exhibit A


2.   A chart showing Alliant Energy's  aggregate  investment in each EWG or FUCO
     compared to the Requested EWG/FUCO Investment  Authority.  The chart should
     also  identify  any new EWG or FUCO,  compared  to the  Requested  EWG/FUCO
     Investment Authority,  in which Alliant Energy has invested or committed to
     invest during the preceding quarter.
        
     ANSWER:
        
     See  attached Exhibit A

                                      -1-

        
        
3.   The consolidated  capitalization ratio of Alliant Energy, with consolidated
     debt to  include  all  short-term  debt and all  other  system  debt,  both
     recourse and nonrecourse, including debt of EWGs and FUCOs.
        
     ANSWER:
        
     See  attached Exhibit B
        
        
4.   The market-to-book ratio of Alliant Energy's common stock.

     ANSWER:
        
     See  attached Exhibit C


5.   Analysis of the growth in  consolidated  retained  earnings that segregates
     total  earnings  growth of EWGs and FUCOs from that  attributable  to other
     subsidiaries of Alliant Energy.

     ANSWER:

     See  attached Exhibit D


6.   A statement of revenues and net income for each EWG and FUCO for the twelve
     months ending as of the end of that quarter.

     ANSWER:

     See  attached Exhibit E


7.   The sales of any common stock or preferred securities by Alliant Energy and
     the purchase  price per share and the market price per share at the date of
     the agreement of sale.

     ANSWER:

     There were no shares issued under a continuous  equity offering program and
     no shares issued as restricted stock in this period.

                                      -2-



8.   The total  number  of  shares of  Alliant  Energy  common  stock  issued or
     issuable under options granted during the quarter under employment  benefit
     plans and dividend  reinvestment plans including any employee benefit plans
     or dividend reinvestment plans later adopted.

     ANSWER:
        
     See  attached Exhibit F


9.   If a guaranty is issued during the quarter, the name of the guarantor,  the
     name of the  beneficiary of the guaranty and the amount,  terms and purpose
     of the guaranty.

     ANSWER:

     See  attached Exhibits G


10.  The amount and terms of any Alliant Energy  indebtedness  issued during the
     quarter.

     ANSWER:
       
     None 


11.  The  amount  and  terms of any  financings  consummated  by any  Nonutility
     Subsidiary that is not exempt under rule 52.

     ANSWER:
        
     None 
         
        
12.  The notional  amount and  principal  terms of any  Interest  Rate Hedges or
     Anticipatory Hedges entered into during the quarter and the identity of the
     other parties to the transaction.

     ANSWER:

     None 
        
        
13.  The name, parent company and amount invested in any intermediate subsidiary
     or financing, subsidiary during the quarter and the amount and terms of any
     securities issued by those subsidiaries during the quarter.

                                      -3-


     ANSWER:

     See  attached Exhibit H


14.  A list of U-6B-2  forms  filed  with the  Commission  during  the  quarter,
     including the name of filing entity and the date of the filing.
        
     ANSWER:
        
     Alliant Energy Corporate Services, Inc. filed a U-6B-2 on November 9, 2004.
     Wisconsin  Power and Light  Company,  Inc.  filed a U-6B-2 on November  10,
     2004.
        

15.  Consolidated  balance  sheets  as of the end of the  quarter  and  separate
     balance  sheets as of the end of the  quarter for each  company,  including
     Alliant Energy, that has engaged in jurisdictional  financing  transactions
     during the quarter.

     ANSWER:

     Incorporated by reference to Alliant  Energy's Form 10-K for the year ended
     December 31, 2004.


16.  A table  showing,  as of the end of the quarter,  the dollar and percentage
     components  of the capital  structure of Alliant  Energy on a  consolidated
     basis and of each Utility Subsidiary.

     ANSWER:

     See  attached Exhibit I


17.  A retained earnings analysis of Alliant Energy on a consolidated  basis and
     of each Utility Subsidiary detailing gross earnings, goodwill amortization,
     dividends  paid  out of each  capital  account  and the  resulting  capital
     account balances at the end of the quarter.

     ANSWER:

     See  attached Exhibit J


18.  Registration statements filed under the Securities Act of 1933 with respect
     to  securities  that  are  subject  of this  Application  will be  filed or
     incorporated by reference as exhibits to the next  certificate  filed under
     rule 24.

                                      -4-


     ANSWER:

     None 


                               S I G N A T U R E
               
     Pursuant to the  requirements  of the Public Utility Holding Company Act of
1935, as amended, the undersigned companies have duly caused this Certificate to
be signed on their behalf by the undersigned thereunto duly authorized.
               
                               ALLIANT ENERGY CORPORATION 

                                                                            
                   By:         /s/ Thomas L Hanson               
                            ---------------------------------------------- 
                             Name:   Thomas L. Hanson
                             Title:  Vice President and Treasurer


March 22, 2005


                                      -5-


Alliant Energy Corporation
Certificate Pursuant to Rule 24
Exhibit A
Report Period:  October 1, 2004 - December 31, 2004

Item 1: A  computation  in  accordance  with rule 53(a)  setting  forth  Alliant
     Energy's  "aggregate  investment" in all EWGs and FUCOs, its  "consolidated
     retained  earnings" and a  calculation  of the amount  remaining  under the
     Requested EWG/FUCO Investment Authority.

Item 2: A chart showing  Alliant  Energy's  aggregate  investment in each EWG or
     FUCO compared to the Requested  EWG/FUCO  Investment  Authority.  The chart
     should  also  identify  any  new EWG or  FUCO,  compared  to the  Requested
     EWG/FUCO  Investment  Authority,  in which  Alliant  Energy has invested or
     committed to invest during the preceding quarter.

December 31, 2004 
                                                  


                                                                                                          
                                                                                                                  Aggregate 
                                                                            Investments      Commitments         Investment
                                                                          -------------------------------------------------------
                                                                                       (dollars in millions)

Alliant Energy Operaciones de Mexico, S. de R.L. de C.V.                  $        -        $         -       $         -
Alliant Energy Servicios de Mexico, S. de R.L. de C.V.                             -                  -                 -
Anhui New Energy Heat & Power Co. Ltd.                                          12.3                  -              12.3
Catleo Energia S.A.                                                                -                  -                 -
Companhia de Electricidade de Nova Friburgo S.A.                                   -                  -                 -
Companhia Energetica da Borborema S.A.                                             -                  -                 -
Companhia Forca e Luz Cataguazes-Leopoldina S.A.                                 1.0                  -               1.0
Empresa Energetica de Sergipe S.A.                                               0.2                  -               0.2
Hebei Wuan Peak Heat and Power Co. Ltd.                                          7.7                  -               7.7
Henan Anfeng Electric Power Co. Ltd.                                             9.0                  -               9.0
Henan Yongfeng Electric Power Co. Ltd.                                          11.0                  -              11.0
Infratil Ltd.                                                                   15.0                  -              15.0
Jiaxing JIES Heat & Power Co. Ltd.                                              13.4                  -              13.4
LDM Utility Co., S.A. de C.V.                                                   40.5                  -              40.5
Shijiazhuang Chengfeng Cogeneration Co. Ltd.                                    15.3                  -              15.3
Sociedade Anonima de Eletrificacao da Paraiba S.A.                              90.2                  -              90.2
Tai An Hua Feng Peak Heat and Power Co. Ltd.                                     6.3                  -               6.3
Tai An Xin Wen Peak Heat and Power Co. Ltd.                                        -                  -                 -
Tangshan Peak Heat & Power Co. Ltd.                                             48.5                  -              48.5
Tongxiang TIES Heat & Power Co. Ltd.                                            10.4                  -              10.4
TrustPower Ltd.                                                                 44.1                  -              44.1
Usina Termeletrica de Juiz De Fora S.A.                                         13.9                  -              13.9
Zouping Peak CHP Co. Ltd.                                                       15.9                  -              15.9
                                                                          ------------------------------------------------------
Aggregate Investments in Foreign Utility Companies (FUCOs)                     354.7                  -             354.7
                                                                          -------------------------------------------------------

Alliant Energy Neenah, LLC                                                      56.0                  -              56.0
Sheboygan Power, LLC                                                           113.2               27.1             140.3
Guarantee of the debt security of a 6 Mw low Btu gas electric generating 
 facility in Cedar Rapids, Iowa                                                    -                4.1               4.1
                                                                          -------------------------------------------------------
        Aggregate Investments in Electric Wholesale Generators (EWGs)          169.2               31.2             200.4
                                                                          -------------------------------------------------------
                                                                          
             Total Aggregate Investments in EWGs and FUCOs                $    523.9        $      31.2       $     555.1
                                                                          =======================================================
                                                                          
                                                                          
  
                                                                                               Balance at          Average
                                                                                               end of quarter      balance
                                                                          -------------------------------------------------------
                                                                                                                                 
Alliant Energy's consolidated retained earnings at March 31, 2004                           $     846.8    
Alliant Energy's consolidated retained earnings at June 30, 2004                                  805.9
Alliant Energy's consolidated retained earnings at September 30, 2004                             859.5
Alliant Energy's consolidated retained earnings at December 31, 2004                              871.9
                                                                          -------------------------------------------------------
Alliant Energy's "consolidated retained earnings" at December 31, 2004 
 (average of ending balance of four previous quarters)                                                              846.0
                                                                                                      ---------------------------
Amount remaining under the Requested EWG/FUCO Investment Authority.                                           $     290.9
                                                                                                      ===========================




                                      -6-



Alliant Energy Corporation
Certificate Pursuant to Rule 24
Exhibit B
Report Period:  October 1, 2004 - December 31, 2004


Item 3:  The  consolidated   capitalization   ratio  of  Alliant  Energy,   with
     consolidated debt to include all short-term debt and all other system debt,
     both recourse and nonrecourse, including debt of EWGs and FUCOs.


Alliant Energy Corporation Consolidated Statement of Capitalization
December 31, 2004
(amounts in millions of dollars) 


                                                               
               
                                                    Amounts        Percentage
                                                -------------------------------

Common equity                                     $    2,561.4        47.89%
Cumulative preferred stock                               243.8         4.56%
Consolidated debt (1)                                  2,542.8        47.55%
                                                -------------------------------
                                                  $    5,348.0       100.00%
                                                ===============================
                                                

(1)
Long-term debt, net (excluding current portion)   $    2,299.5
Current maturities                                       102.3
Variable rate demand bonds                                39.1
Commercial paper                                          83.0
Other short-term borrowings                               18.9
                                                --------------------
                                                
                                                  $    2,542.8
                                                ====================
                                                

                                      -7-


                                                                    
Alliant Energy Corporation
Certificate Pursuant to Rule 24
Exhibit C
Report Period:  October 1, 2004 - December 31, 2004


Item 4: The market-to-book ratio of Alliant Energy's common stock.


                                                     


Market value per share at December 31, 2004             $         28.60
Common equity at December 31, 2004 (in millions)        $       2,561.4
Total shares outstanding at December 31, 2004               115,741,816
Book value per share at December 31, 2004               $         22.13
Market-to-book ratio of Alliant Energy's common stock            129.23%
                                                       ======================



                                      -8-



Certificate Pursuant to Rule 24
Exhibit D
Report Period:  October 1, 2004 - December 31, 2004


Item 5: Analysis of the growth in consolidated retained earnings that segregates
     total  earnings  growth of EWGs and FUCOs from that  attributable  to other
     subsidiaries of Alliant Energy.

Alliant Energy Corporation
Statement of Retained Earnings
For the Three Months Ended December 31, 2004
(amounts in millions of dollars)


                                                                


Beginning balance (September 30, 2004)                           $  859.5
Net income/(loss):
From EWGs and FUCOs (*)                              10.0
Other                                                32.7
                                                ------------        
Total net income/(loss)                                              42.7
Common stock dividends                                              (30.3)
                                                                -------------
Ending balance (December 31, 2004)                               $  871.9
                                                                =============

(*)  Amount  does not include  the  allocation  of  interest,  tax or  corporate
     expenses.


                                      -9-


Alliant Energy Corporation
Certificate Pursuant to Rule 24
Exhibit E
Report Period:  October 1, 2004 - December 31, 2004


Item 6: A  statement  of  revenues  and net income for each EWG and FUCO for the
     twelve months ending as of the end of that quarter.


                                                                          

                                                      For the twelve months ended December 31, 2004
                                                    -------------------------------------------------
 
                                                         Revenues          Net Income/(Loss)
                                                      -------------     ---------------------- 
                                                               dollars in millions
                                                      -----------------------------------------
                                                      

Alliant Energy Neenah, LLC                                  14.6                 3.8
Alliant Energy Operaciones de Mexico, S. de R.L. de C.V.     0.8                (0.2)
Alliant Energy Servicios de Mexico, S. de R.L. de C.V.         -                   -
Anhui New Energy Heat & Power Co. Ltd.                      26.1                 2.5
Catleo Energia S.A.                                         13.7                 8.6
Companhia de Electricidade de Nova Friburgo S.A.            22.5                 2.1
Companhia Energetica da Borborema S.A.                      28.8                 3.7
Companhia Forca e Luz Cataguazes-Leopoldina S.A.            82.3                 7.3
Empresa Energetica de Sergipe S.A.                         118.0                 8.8
Hebei Wuan Peak Heat and Power Co. Ltd.                      6.1                (1.1)
Henan Anfeng Electric Power Co. Ltd.                        11.0                 0.8
Henan Yongfeng Electric Power Co. Ltd.                      11.0                 0.6
Infratil Ltd.                                              111.1                32.9
Jiaxing JIES Heat & Power Co. Ltd.                          25.8                 1.0
LDM Utility Co., S.A. de C.V.                                0.2                (0.4)
Sheboygan Power, LLC                                           -                (0.2)
Shijiazhuang Chengfeng Cogeneration Co. Ltd.                10.7                 0.6
Sociedade Anonima de Eletrificacao da Paraiba S.A.         147.7                12.0
Tai An Hua Feng Peak Heat and Power Co. Ltd.                 9.3                 3.0
Tai An Xin Wen Peak Heat and Power Co. Ltd.                 10.6                 2.8
Tangshan Peak Heat and Power Co. Ltd.                       30.2                 6.2
Tongxiang TIES Heat & Power Co. Ltd.                        12.2                 0.5
TrustPower Ltd.                                            388.7                47.2
Usina Termeletrica de Juiz De Fora S.A.                     32.1                 7.2
Zouping Peak CHP Co. Ltd.                                   20.0                 0.9




                                      -10-



Alliant Energy Corporation
Certificate Pursuant to Rule 24
Exhibit F
Report Period:  October 1, 2004 - December 31, 2004

Item 8: The total  number of shares of Alliant  Energy  common  stock  issued or
     issuable under options granted during the quarter under employment  benefit
     plans and dividend  reinvestment plans including any employee benefit plans
     or dividend reinvestment plans later adopted.


                                                    
                                Original Issue

                  Shareowner                             Long-term Equity
 Date             Direct Plan           401K             Incentive Plan
----------------------------------------------------------------------------
 10/15/2004           17,458                -                        -
 11/15/2004          117,836                -                        -
 11/16/2004                -           32,980                        - 
 12/07/2004                -                -                    6,782
 12/15/2004           16,009                -                        -
 12/17/2004                -                -                   34,768
============================================================================
   TOTALS            151,303           32,980                   41,550



Grand Total:                  225,833



                                      -11-



Alliant Energy Corporation
Certificate Pursuant to Rule 24
Exhibit G
Report Period:  October 1, 2004 - December 31, 2004


Item 9: If a guaranty is issued during the quarter,  the name of the  guarantor,
     the name of the  beneficiary  of the  guaranty  and the  amount,  terms and
     purpose of the guaranty.


                                                                                               
                                                                                     Date Of
                                                                                     Issue/
                                                                                     Amend-     Date of           Amount
Guarantor    On Behalf Of         Purpose            Name of Guaranteed Party        ment      Expiration        Guaranteed
-----------------------------------------------------------------------------------------------------------------------------------

     There were no guarantees issued during the quarter.










                                                                                                        

                                                                            Name of                                     Amount
Guarantor         On Behalf Of               Purpose                   Guaranteed Party              Period           Guaranteed
-----------------------------------------------------------------------------------------------------------------------------------

Bonds:          

Alliant Energy   RMT                     Contractors Bond          Construction Industry       10/11/04-10/11/05       $    50,000
                                                                     Recovery Fund                                                 

Alliant Energy   Alliant Energy EPC LLC  Contractor's Bond         State of Washington         10/19/04-10/19/05       $    12,000

Alliant Energy   RMT                     Right of Way Bond         Road Commission for         11/18/04-11/18/05       $     5,000
                                                                    Oakland County

Alliant Energy   RMT                     Right of Way Bond         Road Commission for         11/22/04-11/22/05       $     5,000
                                                                     Oakland County

Alliant Energy   IPL/AECS               State of Illinois          State of Illinois           12/01/04-12/01/05       $   200,000

Alliant Energy   Bastian Bay Pipeline   Right of Way Grant Bond    US Minerals Mgmt Service    12/15/04-12/15/05       $   300,000

Alliant Energy   Cogenex                Energy Savings             Central Maine Power         12/31/04-12/31/05       $   199,800





                                      -12-



Certificate Pursuant to Rule 24
Exhibit H
Report Period:  October 1, 2004 - December 31, 2004


Item 13: The name,  parent  company  and  amount  invested  in any  intermediate
     subsidiary  or financing  subsidiary  during the quarter and the amount and
     terms of any securities issued by those subsidiaries during the quarter.



     Alliant  Energy  Corporation  did not  form any  intermediate  subsidiaries
     during the period from October 1, 2004 through December 31, 2004.


     Alliant Energy Corporation did not form any financing  subsidiaries  during
     the period from October 1, 2004 through December 31, 2004.


     Alliant Energy and its  subsidiaries  were authorized by the Securities and
     Exchange  Commission  to invest up to $800  million in  additional  "energy
     assets" through December 31, 2004. Alliant Energy completed the sale of its
     remaining ownership interest in Whiting Petroleum Corporation in the fourth
     quarter of 2004, and at December 31, 2004 had  approximately  $4 million of
     other  investments  in  "energy  assets" by various  other  Alliant  Energy
     subsidiaries.


                                      -13-



Alliant Energy Corporation
Certificate Pursuant to Rule 24
Exhibit I
Report Period:  October 1, 2004 - December 31, 2004


Item 16:  A  table  showing,  as of the  end  of the  quarter,  the  dollar  and
     percentage  components  of the  capital  structure  of Alliant  Energy on a
     consolidated basis and of each Utility Subsidiary.


                                                                                                         

                                                                                Interstate Power and       Wisconsin Power and
December 31, 2004                                Alliant Energy Corporation        Light Company              Light Company
(amounts in millions of dollars)
                                                   Amounts     Percentage      Amounts     Percentage        Amounts     Percentage
                                                 -------------------------- -------------------------- -----------------------------
                                                 

Common equity                                     $  2,561.4     47.89%     $  1,142.3       49.13%      $ 1,050.9        63.72%
Cumulative preferred stock                             243.8      4.56%          183.8        7.90%           60.0         3.64%
Consolidated debt (1)                                2,542.8     47.55%          999.1       42.97%          538.3        32.64%
                                                 -------------------------- -------------------------- -----------------------------
                                                  $  5,348.0    100.00%     $  2,325.2      100.00%      $ 1,649.2       100.00%
                                                 ========================== ========================== =============================
                                                 

(1)
Long-term debt, net (excluding current portion)   $  2,299.5                  $   960.4                  $  364.2
Current maturities                                     102.3                        2.7                      88.0
Variable rate demand bonds                              39.1                          -                      39.1
Commercial paper                                        83.0                       36.0                      47.0
Other short-term borrowings                             18.9                          -                         -
                                                 ---------------            --------------             ---------------
                                                  $  2,542.8                  $   999.1                  $  538.3
                                                 ===============            ==============             ===============
                                             


                                      -14-



Alliant Energy Corporation
Certificate Pursuant to Rule 24
Exhibit J
Report Period:  October 1, 2004 - December 31, 2004


Item 17: A retained earnings analysis of Alliant Energy on a consolidated  basis
     and  of  each  Utility  Subsidiary   detailing  gross  earnings,   goodwill
     amortization,  dividends paid out of each capital account and the resulting
     capital account balances at the end of the quarter.

Statement of Retained Earnings
For the Three Months Ended December 31, 2004
(amounts in millions of dollars)


                                                                                     
                                                                                          Alliant Energy
                                           Interstate Power        Wisconsin Power         Corporation
                                           and Light Company      and Light Company       Consolidated

Beginning balance (September 30, 2004)     $   375.8               $   458.1              $   859.5
Gross earnings (1)                              31.4                    25.8                   42.7
Goodwill amortization (2)                          -                       -                      -
Common stock dividends                         (26.5)                  (22.2)                 (30.3)
                                        -------------------------------------------------------------------
Ending balance (December 31, 2004)         $   380.7               $   461.7              $   871.9
                                        ===================================================================



(1)  Gross earnings is defined as net income excluding goodwill amortization.

(2)  Pursuant  to the  adoption  of FAS142 on January 1,  2002,  Alliant  Energy
     Corporation and its  consolidated  subsidiaries  ceased the amortization of
     goodwill.


                                      -15-