SEC File No. 70-10122




                       SECURITIES AND EXCHANGE COMMISSION

                              WASHINGTON, DC 20549




                             CERTIFICATE PURSUANT TO

                                     RULE 24

                            OF PARTIAL COMPLETION OF

                                  TRANSACTIONS




                                FirstEnergy Corp.





------------------------------------:
In the matter of                    :
FirstEnergy Corp.                   : Certificate Pursuant
                                    : to Rule 24 of Partial
                                    : Completion of
                                    : Transactions
                                    :
SEC File No. 70-10122               :
(Public Utility Holding Company Act :
of 1935)                            :
------------------------------------


TO THE MEMBERS OF THE SECURITIES AND EXCHANGE COMMISSION:

         The  undersigned,  FirstEnergy  Corp.  (FirstEnergy)  hereby  certifies
pursuant  to Rule 24 of the  Rules and  Regulations  under  the  Public  Utility
Holding Company Act of 1935 (the Act), that certain of the transactions proposed
in the  Applications,  as  amended,  filed in SEC File No.  70-10122  have  been
carried out in  accordance  with the  Commission's  Order dated June 30, 2003 as
follows:

(1) During the period  January 1, 2004  through  March 31,  2004,  there were no
sales of common stock or preferred securities by FirstEnergy.

(2) During  the first  quarter of 2004,  3,614,249  shares of common  stock were
issuable  pursuant to options granted under employee  benefit plans and dividend
reinvestment plans.

(3) During the period  January 1, 2004 through  March 31, 2004,  no  FirstEnergy
common  stock was  transferred  to a seller  of  securities  of a company  being
acquired.

(4) During the period  January 1, 2004  through  March 31,  2004,  there were no
Long-term  Debt and  Preferred  Securities  issued by  FirstEnergy.  FirstEnergy
issued the following Short-term Debt during the first quarter of 2004:



                        Transaction      Maturity                  Transaction
                           Date            Date        Rate           Amount              Loan Balance
                        -----------      --------      ----        ------------           ------------

CitiBank (FirstEnergy Revolver - 375mm 364 Day Facility)
--------------------------------------------------------
                                                                         
FirstEnergy               1/20/2004       1/21/2004    3.00%       $80,000,000.00       $250,000,000.00

CitiBank (FirstEnergy Revolver - 500mm 3 Year Facility)
-------------------------------------------------------
FirstEnergy               1/20/2004       1/27/2004    2.58%       $25,000,000.00       $295,000,000.00
FirstEnergy               1/30/2004       2/6/2004     2.58%       $50,000,000.00       $295,000,000.00
FirstEnergy               3/1/2004        3/5/2004     2.58%       $40,000,000.00       $215,000,000.00
FirstEnergy               3/19/2004       3/22/2004    2.58%       $40,000,000.00       $185,000,000.00
FirstEnergy               3/22/2004       3/29/2004    2.58%      $110,000,000.00       $295,000,000.00

CitiBank (FirstEnergy Revolver - 375mm 3 year Facility)
-------------------------------------------------------
FirstEnergy               3/25/2004       4/1/2004     2.84%       $75,000,000.00        $75,000,000.00


(5) During the period  January 1, 2004  through  March 31, 2004,  the  following
short-term debt was issued by the Utility Subsidiaries:

                                       1





                        Transaction      Maturity                  Transaction
                           Date            Date        Rate           Amount              Loan Balance
                        -----------      --------      ----        ------------           ------------

CitiBank (Ohio Edison Company (OE) Revolver)
--------------------------------------------
                                                                          
OE                        3/1/2004        3/15/2004    2.18%       $60,000,000.00        $60,000,000.00
OE                        3/15/2004       3/25/2004    2.30%       $70,000,000.00       $130,000,000.00

FirstMerit (OE Bi-Lateral Facility)
-----------------------------------
OE                        1/12/2004       1/13/2004    1.75%       $14,000,000.00        $14,000,000.00
OE                        1/20/2004       1/23/2004    1.75%       $14,000,000.00        $14,000,000.00
OE                        2/27/2004       3/3/2004     1.81%        $7,000,000.00         $7,000,000.00
OE                        3/1/2004        3/3/2004     1.81%        $7,000,000.00         $7,000,000.00
OE                        3/15/2004       3/16/2004    1.81%        14,000,000.00         14,000,000.00

KeyBank (OE Bi-Lateral Facility)
--------------------------------
OE                       12/31/2003       1/6/2004     2.00%        $3,000,000.00         $3,000,000.00
OE                        1/2/2004        1/6/2004     2.03%        $5,000,000.00         $5,000,000.00
OE                        1/5/2004        1/6/2004     2.02%       $12,000,000.00        $12,000,000.00
OE                        1/16/2004       1/21/2004    2.00%        $4,000,000.00         $4,000,000.00
OE                        1/20/2004       1/23/2004    2.03%       $18,000,000.00        $18,000,000.00
OE                        2/2/2004        2/3/2004     2.02%       $18,000,000.00        $18,000,000.00
OE                        3/1/2004        3/2/2004     2.06%       $10,500,000.00        $10,500,000.00
OE                        3/15/2004       3/16/2004    2.05%        $6,000,000.00         $6,000,000.00


Under the Utility Money Pool, the principal  balance of borrowings at the end of
the first quarter of 2004 and average  interest rate during the first quarter of
2004 are as follows:

     Regulated Money Pool                    Average            Principal
    Loan to/(Borrowing from):             Interest Rate           Balance
    -------------------------              -------------        ----------
OE                                            1.3041%        $  453,365,926
Pennsylvania Power Company (Penn)             1.3041%           (40,418,244)
The Cleveland Electric Illuminating
  Company (CEI)                               1.3041%             2,410,192
The Toledo Edison Company (TE)                1.3041%          (262,654,074)
American Transmission Systems,
  Incorporated (ATSI)                         1.3041%            97,885,223
Jersey Central Power & Light
  Company (JCP&L)                             1.3041%          (151,241,254)
Metropolitan Edison Company (Met-Ed)          1.3041%           114,879,557
Pennsylvania Electric Company
  (Penelec)                                   1.3041%           (17,184,644)
York Haven Power Company                      1.3041%            11,645,943


(6) During the first quarter of 2004,  there were no financings  consummated  by
any Non-Utility subsidiary that were not exempt under rule 52.


(7) During the first  quarter of 2004,  the  following  guarantees  were made by
FirstEnergy to support activities of its subsidiaries:

                                                                      Purpose of
         Beneficiary                       Amount           Terms     Guarantee
         -----------                       ------           -----     ----------

         FirstEnergy Solutions Corp. (FES) (Trading - Electric)
         ------------------------------------------------------
         ACES Power Marketing              $50,000           (a)        (b)

         FES (Trading - Gas)
         --------------------
         BG LNG Services, LLC            3,000,000           (a)        (b)

                                       2



         FirstEnergy Generation Corp. (Fuel Marketing / Coal)
         ----------------------------------------------------
         Ceredo Synfuel, LLC            10,000,000           (a)        (c)
         Peabody Coal Trade              1,000,000           (a)        (c)

         Met-Ed (Long-term Power Supply)
         -------------------------------
         Constellation Power Source      7,500,000           (d)        (e)

         Penelec (Long-term Power Supply)
         -------------------------------
         Constellation Power Source      7,500,000           (d)        (f)

         Elliott Lewis Corp.- HVAC
         -------------------------
         Dept of Housing & Urban Dev.    5,000,000         5 years      (g)

         (a) Such  guarantees  are issued for a  one-year  term,  with a ten-day
         termination right by FirstEnergy
         (b) Parental guarantees issued by FirstEnergy to provide credit support
         for electric power and natural gas purchases by subsidiary
         (c) Credit backstop to support coal purchases and emission trading
         (d) Expires on December 31, 2010.
         (e) Parental  guaranty  issued by  FirstEnergy to support the long-term
         power purchase by Metropolitan Edison Company from Constellation.
         (f) Parental  guaranty  issued by  FirstEnergy to support the long-term
         power purchase by Pennsylvania Electric Company from Constellation.
         (g) Credit backstop to support Elliott Lewis in a commercial facilities
         management services contract.

The following Letters of Credits (LOC) were issued during the first quarter of
2004:

                                                                     Purpose of
         Beneficiary                               Amount                LOC
         -----------                               ------            -----------

         FES
         ---
         Nicor Gas                             $   100,000               (a)

         FirstEnergy
         -----------
         Travels Casualty and Surety Co.
            of America                          18,000,000               (b)

         (a) Pledge security for  participation in the Nicor Gas  transportation
         territory.  Amount  reduced  from  $720,000  to  $100,000  in the first
         quarter of 2004.
         (b)  Replaces  Surety  Bonds on  self-insurance  coverage due to rating
         agency changes.


(8) During the First  Quarter of 2004,  FirstEnergy  Corp.  entered into one (1)
transaction  designed  to hedge the fair  value of a portion  of its  fixed-rate
long-term  debt  portfolio  against  decreases  in  interest  rates.  The  hedge
structure is a fixed - for - floating  interest rate swap,  whereby  FirstEnergy
Corp.  will receive  fixed  payments  equivalent to the fixed coupon rate of the
bond being hedged,  and pay floating rate payments  based on the 3-month  London
Interbank  Offering  Rate (LIBOR) plus or minus an applicable  spread.  The debt
instrument being hedged, notional amount,  counterparty,  and principal terms of
the fair value hedge are filed pursuant to request for confidential treatment.

                                       3





(9) There  were no  investments  made  during  the first  quarter of 2004 in any
intermediate subsidiary or financing subsidiary.

(10) There were no U-6B-2 filed during the first quarter of 2004.

(11) Met-Ed and Penelec engaged in jurisdictional  financing transactions during
the first quarter of 2004. Consolidated balance sheets of Met-Ed and Penelec for
the quarter ended March 31, 2004 are  incorporated  by reference to Met-Ed's and
Penelec's Form 10-Q Quarterly Report to SEC for the quarter ended March 31, 2004
(File No. 1-446 and 1-3522, respectively).

(12) The following table presented in thousands,  provides the capital structure
of FirstEnergy on a consolidated basis and each Utility Subsidiary as of the end
of the first quarter 2004.


FirstEnergy                  Amount                  Ratio
-----------                ----------                -----
Common Equity              $8,344,723                40.31%
Preferred Stock               335,123                 1.62%
Long-Term Debt             11,886,804                57.42%
Short-Term Debt               133,999                 0.65%
                           ----------               ------
Total Capitalization      $20,700,649               100.00%
                           ----------               ------

OE
--
Common Equity              $2,607,538                58.00%
Preferred Stock               100,070                 2.23%
Long-Term Debt              1,588,890                35.34%
Short-Term Debt               199,216                 4.43%
                           ----------               ------
Total Capitalization       $4,495,714               100.00%
                           ----------               ------

CEI
---
Common Equity              $1,775,311                42.05%
Preferred Stock                96,404                 2.28%
Long-Term Debt              2,334,493                55.29%
Short-Term Debt                16,203                 0.38%
                           ----------               ------
Total Capitalization       $4,222,411               100.00%
                           ----------               ------

TE
--
Common Equity                $758,192                43.14%
Preferred Stock               126,000                 7.17%
Long-Term Debt                610,545                34.74%
Short-Term Debt               262,654                14.95%
                           ----------               ------
Total Capitalization       $1,757,391               100.00%
                           ----------               ------

Penn
----
Common Equity                $241,816                47.98%
Preferred Stock                39,105                 7.76%
Long-Term Debt                182,621                36.24%
Short-Term Debt                40,418                 8.02%
                           ----------               ------
Total Capitalization         $503,960               100.00%
                           ----------               ------

                                       4





JCP&L
-----
Common Equity              $3,162,229                68.84%
Preferred Stock                12,649                 0.28%
Long-Term Debt              1,267,345                27.59%
Short-Term Debt               151,241                 3.29%
                           ----------               ------
Total Capitalization       $4,593,464               100.00%
                           ----------               ------

Met-Ed
------
Common Equity              $1,302,464                59.83%
Preferred Stock                  -                     -  %
Long-Term Debt                874,515                40.17%
Short-Term Debt                  -                     -  %
                           ----------               ------
Total Capitalization       $2,176,979               100.00%
                           ----------               ------

Penelec
-------
Common Equity              $1,302,996                64.06%
Preferred Stock                  -                     -  %
Long-Term Debt                713,860                35.10%
Short-Term Debt                17,185                 0.84%
                           ----------               ------
Total Capitalization       $2,034,041               100.00%
                           ----------               ------

(13) The  following  table  presented in thousands  provides  retained  earnings
analysis of FirstEnergy on a consolidated  basis and each Utility  Subsidiary as
of the end of the first quarter 2004.


                                   FirstEnergy      OE         CEI        TE
                                   -----------    ------     --------  --------
Balance, December 31, 2003         $1,604,385    $522,934    $494,212  $113,620
Net Income                            173,999      76,093      48,475     7,531
Cash Dividends on Preferred Stock        -           (561)     (1,743)   (2,211)
Cash Dividends on Common Stock       (122,465)    (54,000)    (55,000)     -
Other                                    -           -           -         -
                                   ----------    --------    --------  --------
Balance, March 31, 2004            $1,655,919    $544,466    $485,944  $118,940
                                   ----------    --------    --------   -------


                                     Penn        JCP&L       Met-Ed    Penelec
                                    -------     -------      ------   --------
Balance, December 31, 2003          $54,179     $22,132      $27,011   $18,038
Net Income                           19,670      13,398       18,044     5,659
Cash Dividends on Preferred Stock      (640)       (124)        -         -
Cash Dividends on Common Stock       (8,000)     (5,000)      (5,000)     -
Other                                  -           -            -         -
                                    -------     -------      -------   -------
Balance, March 31, 2004             $65,209     $30,406      $40,055   $23,697
                                    -------     -------      -------   -------


(14) On February 6, 2004, Moody's  downgraded  FirstEnergy senior unsecured debt
to Baa3 from Baa2 and downgraded  the senior  secured debt of JCP&L,  Met-Ed and
Penelec to Baa1 from A2. Moody's also  downgraded the preferred  stock rating of
JCP&L to Ba1 from Baa2 and the senior  unsecured  rating of Penelec to Baa2 from
A2. The  ratings of OE,  CEI,  TE and Penn were  confirmed.  A complete  list of
Moody's ratings actions follows:

The ratings of the following issuers were downgraded:

         FirstEnergy Corp - senior unsecured and Issuer Rating to Baa3 from Baa2

         Jersey  Central Power & Light Company - senior  secured  rating to Baa1
         from A2, Issuer  Rating to Baa2 from A3, and Preferred  Stock rating to
         Ba1 from Baa2

                                       5



         Metropolitan  Edison  Company - senior  secured rating to Baa1 from A2,
         Senior Secured Shelf to (P)Baa1 from (P)A2,  Issuer Rating to Baa2 from
         A3, and Preferred Shelf to (P)Ba1 from (P)Baa2

         Pennsylvania  Electric Company - senior secured rating to Baa1 from A2,
         senior unsecured rating to Baa2 from A2, and Issuer Rating to Baa2 from
         A3

The ratings of the following FirstEnergy subsidiaries and affiliates were
confirmed:

         Ohio Edison Company - senior secured Baa1, senior secured shelf
         (P)Baa1, Issuer Rating Baa2, Preferred Stock Ba1

         Cleveland Electric Illuminating Company - senior secured rating Baa2,
         Issuer Rating Baa3, Preferred Stock Ba2

         Toledo Edison Company - Senior Secured Baa2, Issuer Rating Baa3,
         Preferred Stock Ba2

         Pennsylvania Power Company - senior secured Baa1, senior secured shelf
         (P)Baa1, Issuer Rating Baa2, Preferred Stock Ba1

         PNPP II Funding Corp. - Backed Senior Secured Baa2

         BVPS II Funding Corp. - Backed Senior Secured Baa2

         CTC Beaver Valley Funding Corp. - Backed Senior Secured Baa3

         CTC Mansfield Funding Corp. - Backed Senior Secured Baa3

         Beaver Valley II Funding Corp. - Backed Senior Secured Baa3


         (15) FirstEnergy's  aggregate investment includes all amounts invested,
         or commitments to be invested,  in exempt wholesale  generators (EWGs),
         for which there is recourse,  directly or indirectly, to the registered
         holding company. Accordingly,  FirstEnergy's aggregate investment as of
         March 31, 2004 is as follows:

                                                       (In Thousands)
                                                       --------------

FE Generation Corp.                                       $ 906,184
Termobarranquilla S. A.                                      60,400
                                                          ---------
         Aggregate Investment in EWGs                     $ 966,584*
                                                          =========

* Aggregate investment amounts reflected here include LOCs and guarantees, but
do not include any goodwill or other fair value adjustments.

                                       6




Aggregate Investment as a Percentage of FirstEnergy and Subsidiary Companies:
----------------------------------------------------------------------------

Total capitalization                    $ 20,700,649      4.7%
Net utility plant                       $ 13,259,146      7.3%
Total consolidated assets               $ 32,584,536      3.0%
Market value of common equity           $ 12,890,002      7.5%

(16) Set forth  below is a summary  of the  direct or  indirect  investments  as
defined in SEC Rule 53(a) by FirstEnergy,  as of March 31, 2004 in EWGs, as well
as the percentage of equity ownership.

                         First         First         Owners not affiliated with
                        Energy's     Energy's %            FirstEnergy
                       Investment      Equity      -----------------------------
Associate              at 03/31/04     Owner-                            Type of
 Company                 ($000)*        ship       Name of Entity         Entity
---------              ----------     -------      ---------------        ------

Termobarranquilla        60,400          0%        ABB Energy            Foreign
S.A. (a)                                           Ventures, Inc.
                                                   Lancaster Steel       Foreign
                                                   Distral Group         Foreign
                                                   Corp. Electrica       Foreign
                                                   De la Costa
                                                   Atlantica
                                                   Darby Mazzanine
                                                   Holdings, LLC

FE Generation
Corp.                   906,184        100%        Not Applicable         N/A
                      ---------

Total Aggregate
Investment in
EWGs                  $ 966,584
                      =========

(*)  Aggregate  investment  amounts  reflected here include LOCs and guarantees,
     but do not include any goodwill or other fair value adjustments.

(a)  FirstEnergy sold Termobarranquilla  S.A.; Barranquilla Lease Holding, Inc.;
     Los Amigos Leasing Company,  Ltd.; EI Barranquilla,  Inc.; EI International
     and GPUI Colombia,  Ltda. to Darby Delaware  Mezzanine  Holdings  L.L.C. on
     January 31, 2004.  The remaining  investment  represents  outstanding  LOCs
     issued by  FirstEnergy.  In addition,  FirstEnergy  sold Midlands  Domestic
     Electricity plc on January 16, 2004.

                                       7




(17) FirstEnergy and Subsidiary Companies Consolidated  Capitalization Ratios as
of March 31, 2004:


                                        Amount (000's)              %
                                        --------------             ----
Common equity                           $  8,344,723               40.3
Preferred stock not subject to               335,123                1.6
  mandatory redemption
Long-term debt-
 Preferred stock subject to
  mandatory redemption *                      18,513                0.1
 Subordinated debentures to
  affiliated trusts**                        198,667                1.0
 Other                                    11,669,624               56.3
Notes payable                                133,999                0.7
                                         -----------              -----

         Total capitalization           $ 20,700,649              100.0%
                                         ===========              =====

*  Effective July 1, 2003 with the adoption of SFAS 150 "Accounting  for Certain
Financial  Instruments  with  Characteristics  of both  Liabilities and Equity",
preferred stock subject to mandatory  redemptions were reclassified as long-term
debt.

** Effective in December  2003 with the adoption of FIN 46R,  "Consolidation  of
Variable Interest Entities,  and Interpretation of ARB No. 51", certain business
trusts and their trust preferred  securities  previously reported by FirstEnergy
in  its  consolidated   financial   statements  have  been   deconsolidated  and
FirstEnergy began reporting the related subordinated  debentures to those trusts
in its consolidated financial statements.

(18) Market-to-book  ratio of FirstEnergy and Subsidiary  Companies common stock
at March 31, 2004:

Closing Market Price per Share                               $ 39.08
Book Value per Share                                         $ 25.46
Market-to Book Ratio of Common Stock                          153.5%

(19) No new  EWG/FUCO  project  covered  by the  Modified  Rule 53 Test in which
Firstenergy  has  invested or committed  to invest  during the first  quarter of
2004.

(20)  Analysis of Growth in Retained  Earnings for  FirstEnergy  and  Subsidiary
Companies:

                                                            (In Thousands)
                                                            --------------
Retained Earnings as of 03/31/04                             $1,655,919
Retained Earnings as of 12/31/03                              1,604,385
                                                             ----------
Growth in Retained Earnings                                  $   51,534
                                                             ==========

                                       8




Analysis of Growth in Retained Earnings:
----------------------------------------

Income contribution from regulated utility companies         $ 167,295
Income contribution from EWGs                                   30,298
Income contribution from all other companies                    20,625
FirstEnergy Holding and Service companies                      (44,219)
Cash dividends declared on common stock                       (122,465)
                                                             ---------
Growth in Retained Earnings                                  $  51,534
                                                             =========


(21)  Statements  of  Operations  for  the  period  ended  March  31,  2004  for
FirstEnergy  Generation  Corp.  will be filed  separately  under a  request  for
confidential treatment under Rule 104 (b)

                                       9




                                    SIGNATURE


     The undersigned  registered  holding company has duly caused this quarterly
report to be signed on its  behalf by the  undersigned  officer  thereunto  duly
authorized  pursuant to the  requirements  of the Public Utility Holding Company
Act of 1935.



                                                      FIRSTENERGY CORP.


May 26, 2004
                                     By:          /s/ Harvey L. Wagner
                                           ------------------------------------
                                                      Harvey L. Wagner
                                                Vice President, Controller
                                               and Chief Accounting Officer
                                               (Principal Accounting Officer)

                                       10