SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549


---------------------------------
In the Matter of                 |
FirstEnergy Corp.                |
                                 |        File Nos. 70-9793 and 70-9941
(Public Utility Holding          |
Company Act of 1935)             |
---------------------------------


                           CERTIFICATE OF NOTIFICATION

        This Certificate of Notification is filed by FirstEnergy Corp.
("FirstEnergy"), an Ohio corporation, in connection with the following
transactions proposed in FirstEnergy's Applications/Declarations on Form U-1, as
amended (the "Applications-Declarations"), and authorized by Order of the
Securities and Exchange Commission (the "Commission") dated October 29, 2001
(the "Order"), pursuant to the Public Utility Holding Company Act of 1935, as
amended (the "1935 Act"), in File Nos. 70-9793 and 70-9941 (Release No.
35-27459). Capitalized terms used herein without definition have the meaning
ascribed to them in the Applications-Declarations or the Agreement and Plan of
Merger dated as of August 8, 2000 between GPU, Inc. ("GPU") and FirstEnergy.
FirstEnergy hereby certifies pursuant to Rule 24:

        i)      That FirstEnergy acquired all of the issued and outstanding
common stock of Northeast Ohio Natural Gas Corp. ("NONGC") and that the NONGC
stock is held by FirstEnergy's wholly-owned subsidiary MARBEL Energy
Corporation, which is exempt from all requirements of the 1935 Act, except for
section 9(a)(2) thereof pursuant to section 3(a)(1) and Rule 2 thereunder.

        ii)     That FirstEnergy acquired all of the issued and outstanding
common stock of GPU, which thereafter merged with and into FirstEnergy and
ceased to exist.

        iii)    That FirstEnergy has paid in cash for 50%, and issued of its
common stock in exchange for 50%, of the shares of common stock of GPU
outstanding at the time of the Merger.

        iv)     That FirstEnergy acquired through the Merger directly all of the
issued and outstanding voting securities of the GPU Energy Companies and
indirectly acquired all of the issued and outstanding voting securities of York
Haven Power Company and Waverly Electric Power & Light Company.

        v)      That FirstEnergy continues to provide, at cost as defined in
Rules 90 and 91, services to affiliates including the Utility Subsidiaries
during an interim period ending on or before February 1, 2003, at which time all
such services will be provided by FirstEnergy Service Company.





        vi)     That FirstEnergy retains directly or indirectly FirstEnergy's
and GPU's non-utility businesses existing as of October 29, 2001, as set forth
in the Applications-Declarations.

        vii)    That except with respect to financing transactions, which will
be reported as set out in the Order, the transactions described in the
Applications-Declarations have been completed.

        Attached hereto as Exhibits F-2.1 - F-2.5 and Exhibit D-2 are past tense
opinions of counsel to FirstEnergy with respect to the
Applications-Declarations.

                                    SIGNATURE

        Pursuant to the requirements of the 1935 Act, the undersigned company
has duly caused this document to be signed on its behalf by the undersigned
thereunto duly authorized.

                                       FirstEnergy Corp.



                                       By: /s/ Leila L. Vespoli
                                           -------------------------------
                                       Leila L. Vespoli
                                       Senior Vice President and General Counsel


Dated: November 7, 2001




                                                                     EXHIBIT D-2




                                FirstEnergy Corp.
                              76 South Main Street
                                Akron, Ohio 44308
                               Phone: 330-384-5800



                                November 7, 2001



Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549

Re:     FirstEnergy Corp. and Northeast Ohio Natural Gas Corp.; SEC File
        No. 70-9941

Ladies and Gentlemen:

        I refer to the Application-Declaration on Form U-1 in File No. 70-9941,
as amended (the "Application"), under the Public Utility Holding Company Act of
1935 (the "Act"), filed by FirstEnergy Corp, an Ohio corporation ("FirstEnergy")
and a registered holding company under the Act, which sought authority for the
acquisition (the "Transaction") by FirstEnergy of all the issued and outstanding
voting securities of Northeast Ohio Natural Gas Corp., an Ohio corporation
("NONGC"). The Transaction was authorized by order of the Securities and
Exchange Commission (the "Commission"), dated October 29, 2001, Release No.
35-27459 (the "Commission Order").

        I am Senior Vice President and General Counsel of FirstEnergy and have
acted as such in connection with the filing of the Application. All capitalized
terms used herein, but not defined herein, shall have the meaning ascribed to
them in the Application.

        In connection with this opinion, I (or persons under my supervision or
control) have examined the Application and the exhibits thereto and originals,
or copies certified to my satisfaction, of such corporate records of the
FirstEnergy and NONGC, certificates of public officials, orders of regulatory
bodies having jurisdiction over aspects of the Transaction including the
Commission Order, certificates of officers and representatives of FirstEnergy,
and NONGC and such other documents, records and matters of law as I have deemed
necessary for the purposes of this opinion.

        Based on the foregoing, and subject to the assumptions, qualifications
and limitations hereinafter specified, I am of the opinion that, for the
Transaction described in the Application and authorized by the Commission Order:





        1.      The laws of the State of Ohio applicable to the Transaction have
been complied with.

        2.      FirstEnergy and NONGC are validly organized and duly existing
corporations.

        3.      FirstEnergy has acquired all the outstanding common stock of
NONGC.

        4.      The consummation of the Transaction did not violate the legal
rights of the lawful holders of any securities issued by FirstEnergy or any
associate company of FirstEnergy.

        This opinion in respect of the Transaction as described in the
Application and authorized by the Commission Order is subject to the following
assumptions or conditions:

                (i)     No opinions are expressed with respect to laws other
                        than those of the State of Ohio.

                (ii)    I have assumed the genuineness of all signatures and the
                        authenticity of all documents submitted to us as
                        originals and the conformity with the originals of all
                        documents submitted to us as copies. As to various
                        questions of fact material to such opinions I have, when
                        relevant facts were not independently established,
                        relied upon certificates by officers of FirstEnergy,
                        NONGC and other appropriate persons and statements
                        contained in the Application.

        I hereby consent to the filing of this opinion as Exhibit D-2 to the
Application to be filed with the Certificate of Notification.



                                       Respectfully yours,

                                       /s/ Leila L. Vespoli

                                       Leila L. Vespoli

                                       Senior Vice President and General Counsel


                                       2



                                                                   EXHIBIT F-2.1


                           Jones, Day, Reavis & Pogue
                              77 West Wacker Drive
                                   Suite 3500
                             Chicago, Illinois 60601
                               Phone: 312-782-3939


                                November 7, 2001


Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549

        Re:     FirstEnergy Corp. and GPU, Inc.;  SEC File No. 70-9793

Ladies and Gentlemen:

                We refer to the Application-Declaration on Form U-1 in File No.
70-9793, as amended (the "Application"), under the Public Utility Holding
Company Act of 1935 (the "Act"), filed by FirstEnergy Corp, an Ohio corporation
("FirstEnergy") and a registered holding company under the Act, and certain
Subsidiaries of FirstEnergy and authorized by order of the Securities and
Exchange Commission (the "Commission") dated October 29, 2001 (the "Order")
granting authority for the following, all as more fully described in the
Application and the Order (the "Transactions"):

        a.      the acquisition by FirstEnergy of all the issued and outstanding
                voting securities of the following U.S. electric utility
                operating subsidiaries of GPU, Inc. ("GPU"): Jersey Central
                Power & Light Company, a New Jersey corporation ("JCP&L"),
                Pennsylvania Electric Company, a Pennsylvania corporation
                ("Penelec") and Metropolitan Edison Company, a Pennsylvania
                corporation ("Met-Ed") and the indirect acquisition of York
                Haven Power Company, a Pennsylvania corporation ("York Haven")
                and Waverly Electric Power & Light Company, a Pennsylvania
                corporation ("Waverly Electric"); such acquisition to be
                accomplished through a merger (the "Merger") of GPU into
                FirstEnergy pursuant to the terms of the Agreement and Plan of
                Merger, dated as of August 8, 2000 (the "Merger Agreement"),
                between FirstEnergy and GPU.

        b.      The issuance by FirstEnergy of its common stock in exchange for
                50% of the shares of GPU common stock outstanding at the time
                the Merger is completed, subject to a certain adjustments
                described in the Merger Agreement. The Merger and the issuance
                of common stock in connection therewith are referred to as the
                "Merger Transactions."





        c.      Financing transactions by FirstEnergy, and in the limited
                circumstances set out in the Application, by the Utility
                Subsidiaries, in the amount of $8.0 billion (which includes the
                common stock issued in the Merger) and related transactions (the
                "Financings"), representing additions to capital, additional
                equity securities, preferred securities and debt (which amount
                includes debt required to finance the cash portion of the
                Merger), in each case including refinancings which do not alter
                outstanding capital but which will not count against the limits,
                for the period beginning with the effective date of an order
                issued pursuant to the Application and continuing to and
                including June 30, 2003 (the "Authorization Period").

        d.      The issuance of 30 million shares of common stock under dividend
                reinvestment and stock-based management incentive and employee
                benefit plans pursuant to Sections 6(a) and 7 of the Act (the
                "Plan Common Stock issuances").

        e.      The issuance of one purchase right (a "Right") together with
                each share of FirstEnergy common stock issued in accordance with
                the authority requested in the Application.

        f.      The issuance by FirstEnergy and the Subsidiaries of guarantees
                (the "Guarantees") in an aggregate amount not to exceed $4.0
                billion outstanding at any time in exposure.

        g.      The authorization and approval of intra-system guarantees, the
                formation and operation of a utility money pool (the "Utility
                Money Pool") and a non-utility money pool (the "Non-Utility
                Money Pool"). The Financings, the Plan Common Stock issuances,
                the Rights transactions, the Guarantees, the Utility Money Pool
                transactions and Non-Utility Money Pool Transactions are
                referred to as the "Securities Transactions."

        We have acted as counsel to FirstEnergy in connection with the filing of
the Application. All capitalized terms used herein but not defined herein shall
have the meaning ascribed to them in the Application.

        In connection with this opinion, we have examined the Application and
the exhibits thereto and the Merger Agreement, and originals, or copies
certified to our satisfaction, of such corporate records of FirstEnergy, GPU and
other entities, certificates of public officials, orders of regulatory bodies
having jurisdiction over aspects of the Transaction, certificates of officers
and representatives of FirstEnergy, GPU and other entities and such other
documents, records and matters of law as we have deemed necessary for the
purposes of this opinion.

        Based on the foregoing, and subject to the assumptions, qualifications
and limitations hereinafter specified, we are of the opinion that:

        1.      FirstEnergy legally acquired pursuant to the Merger all the
outstanding common stock of JCP&L, Penelec and Met-Ed and the other Subsidiaries
of GPU in existence at the date of the Merger.


                                      -2-



        2.      The consummation of the Transactions did not violate the legal
rights of the lawful holders of any securities issued by FirstEnergy or any
associate company of FirstEnergy.

        This opinion in respect of the Transactions as described in the
Application is subject to the following assumptions or conditions:

                (i)     The authorizations and approvals of the Transactions
                        given by the Boards of Directors and shareholders of
                        FirstEnergy and GPU remained in effect at the closings
                        thereof and the Financing Transactions shall have been
                        conducted in accordance with the applicable
                        authorizations and approvals.

                (ii)    The Transactions have been accomplished in accordance
                        with required approvals, authorizations, consents,
                        certificates and orders of all state and federal
                        commissions or regulatory authorities having
                        jurisdiction over any of the Transactions (including,
                        with respect to the Merger, the approval and
                        authorization of the Federal Energy Regulatory
                        Commission under the Federal Power Act, the Federal
                        Communications Commission under the Communications Act,
                        the Nuclear Regulatory Commission under the Atomic
                        Energy Act, the Pennsylvania Public Utility Commission
                        under the applicable laws of the Commonwealth of
                        Pennsylvania, the New Jersey Board of Public Utilities
                        under the applicable laws of New Jersey and the New York
                        Public Service Commission under laws of the State of New
                        York) and all such required approvals, authorizations,
                        consents, certificates, orders and registrations
                        remained in effect at the closings thereof.

                (iii)   With respect to those Transactions occurring after
                        FirstEnergy became subject to registration pursuant to
                        Section 5 of the Act and the rules of the Securities and
                        Exchange Commission thereunder, FirstEnergy has duly
                        registered with the Securities and Exchange Commission
                        as a holding company pursuant to Section 5 of the Act
                        and the rules of the Securities and Exchange Commission
                        thereunder.

                (iv)    The Merger has been completed in accordance with the
                        Merger Agreement; instruments of merger have been duly
                        and validly filed with the Secretaries of State of the
                        Commonwealth of Pennsylvania and State of Ohio,
                        respectively, and such other corporate formalities as
                        are required by the laws of such jurisdictions for the
                        consummation of the merger contemplated by the Merger
                        Agreement have been taken; and such merger became
                        effective in accordance with the laws of Pennsylvania
                        and Ohio, respectively.

                (v)     The parties have obtained all consents, waivers and
                        releases, if any, required for the Transactions under
                        all applicable governing corporate documents, contracts,
                        agreements, debt instruments, indentures, franchises,
                        licenses and permits.


                                      -3-



                (vi)    The documentation necessary for the Financing
                        Transactions shall constitute the valid, binding and
                        enforceable obligations of the parties to such documents
                        other than the FirstEnergy or other issuer thereof (the
                        "Issuers") and each Issuer shall have received the
                        agreed upon consideration for the securities in
                        accordance with the authorizations and approvals
                        referred to in subparagraphs (i) and (iii) above.

                (vii)   A registration statement shall have been declared
                        effective under the Securities Act of 1933 or an
                        exemption from registration shall be applicable under
                        such act with respect to each Financing Transaction and
                        no stop order shall have been entered by the Securities
                        and Exchange Commission with respect thereto.

                (viii)  No opinions are expressed with respect to laws other
                        than those of the States of Ohio, New Jersey and New
                        York and the Commonwealth of Pennsylvania and U.S.
                        federal law. With respect to all matters governed by the
                        laws of the (1) State of Ohio, we have relied on the
                        opinion of Leila L. Vespoli, Vice President and General
                        Counsel of FirstEnergy, (2) the State of New Jersey, we
                        have relied on the opinion of Thelen, Reid & Priest LLP,
                        (3) the State of New York, we have relied on the opinion
                        of Whiteman Osterman & Hanna LLP and (4) the
                        Commonwealth of Pennsylvania, we have relied on the
                        opinion of Ryan, Russell, Ogden & Seltzer LLP, each
                        dated the date hereof.

                (ix)    We have assumed the genuineness of all signatures and
                        the authenticity of all documents submitted to us as
                        originals and the conformity with the originals of all
                        documents submitted to us as copies. As to various
                        questions of fact material to such opinions we have,
                        when relevant facts were not independently established,
                        relied upon certificates by officers of FirstEnergy, GPU
                        and other appropriate persons and statements contained
                        in the Application.

        We hereby consent to the filing of this opinion as an exhibit to the
Application.



                                              Respectfully yours,

                                              JONES, DAY, REAVIS & POGUE


                                      -4-



                                                                   EXHIBIT F-2.2



                                FirstEnergy Corp.
                              76 South Main Street
                                Akron, Ohio 44308
                               Phone: 330-384-5800


                                November 7, 2001


Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549

        Re:     FirstEnergy Corp. and GPU, Inc.;  SEC File No. 70-9793

Ladies and Gentlemen:

                I refer to the Application-Declaration on Form U-1 in File No.
70-9793, as amended (the "Application"), under the Public Utility Holding
Company Act of 1935 (the "Act"), filed by FirstEnergy Corp, an Ohio corporation
("FirstEnergy") and a registered holding company under the Act, and certain
Subsidiaries of FirstEnergy and authorized by order of the Securities and
Exchange Commission (the "Commission") dated October 29, 2001 (the "Order")
granting authority for the following, all as more fully described in the
Application and the Order (the "Transactions"):

        a.      the acquisition by FirstEnergy of all the issued and outstanding
                voting securities of the following U.S. electric utility
                operating subsidiaries of GPU, Inc. ("GPU"): Jersey Central
                Power & Light Company, a New Jersey corporation ("JCP&L"),
                Pennsylvania Electric Company, a Pennsylvania corporation
                ("Penelec") and Metropolitan Edison Company, a Pennsylvania
                corporation ("Met-Ed") and the indirect acquisition of York
                Haven Power Company, a Pennsylvania corporation ("York Haven")
                and Waverly Electric Power & Light Company, a Pennsylvania
                corporation ("Waverly Electric"); such acquisition to be
                accomplished through a merger (the "Merger") of GPU into
                FirstEnergy pursuant to the terms of the Agreement and Plan of
                Merger, dated as of August 8, 2000 (the "Merger Agreement"),
                between FirstEnergy and GPU.

        b.      The issuance by FirstEnergy of its common stock in exchange for
                50% of the shares of GPU common stock outstanding at the time
                the Merger is completed, subject to a certain adjustments
                described in the Merger Agreement. The Merger and the issuance
                of common stock in connection therewith are referred to as the
                "Merger Transactions."





        c.      Financing transactions by FirstEnergy, and in the limited
                circumstances set out in the Application, by the Utility
                Subsidiaries, in the amount of $8.0 billion (which includes the
                common stock issued in the Merger) and related transactions (the
                "Financings"), representing additions to capital, additional
                equity securities, preferred securities and debt (which amount
                includes debt required to finance the cash portion of the
                Merger), in each case including refinancings which do not alter
                outstanding capital but which will not count against the limits,
                for the period beginning with the effective date of an order
                issued pursuant to the Application and continuing to and
                including June 30, 2003 (the "Authorization Period").

        d.      The issuance of 30 million shares of common stock under dividend
                reinvestment and stock-based management incentive and employee
                benefit plans pursuant to Sections 6(a) and 7 of the Act (the
                "Plan Common Stock issuances").

        e.      The issuance of one purchase right (a "Right") together with
                each share of FirstEnergy common stock issued in accordance with
                the authority requested in the Application.

        f.      The issuance by FirstEnergy and the Subsidiaries of guarantees
                (the "Guarantees") in an aggregate amount not to exceed $4.0
                billion outstanding at any time in exposure.

        g.      The authorization and approval of intra-system guarantees, the
                formation and operation of a utility money pool (the "Utility
                Money Pool") and a non-utility money pool (the "Non-Utility
                Money Pool"). The Financings, the Plan Common Stock issuances,
                the Rights transactions, the Guarantees, the Utility Money Pool
                transactions and Non-Utility Money Pool Transactions are
                referred to as the "Securities Transactions."

        I am Senior Vice President and General Counsel of FirstEnergy and have
acted as such in connection with the filing of the Application. All capitalized
terms used herein but not defined herein shall have the meaning ascribed to them
in the Application.

        In connection with this opinion, I (or persons under my supervision or
control) have examined the Application and the exhibits thereto and the Merger
Agreement, and originals, or copies certified to my satisfaction, of such
corporate records of the FirstEnergy, GPU and other entities, certificates of
public officials, orders of regulatory bodies having jurisdiction over aspects
of the Transaction, certificates of officers and representatives of FirstEnergy,
GPU and other entities and such other documents, records and matters of law as I
have deemed necessary for the purposes of this opinion.

        Based on the foregoing, and subject to the assumptions, qualifications
and limitations hereinafter specified, I am of the opinion that:

        1.      The laws of the State of Ohio applicable to the Transactions
will have been complied with.

        2.      FirstEnergy is a validly organized and duly existing
corporation.





        3.      The common stock issued by FirstEnergy in the Merger in exchange
for the common stock of GPU, and issued in any Financing Transaction, are,
respectively, will be validly issued, fully paid and nonassessable and the
holders thereof will be entitled to the rights and privileges appertaining
thereto set forth in the Amended Articles of Incorporation of FirstEnergy

        4.      Each debt, preferred or other security to be issued by any
Issuer in connection with any Financing Transaction will be a valid and binding
obligation of such Issuer in accordance with its terms.

        5.      FirstEnergy legally acquired pursuant to the Merger all the
outstanding common stock of JCP&L, Penelec and Met-Ed and the other Subsidiaries
of GPU in existence at the date of the Merger.

        6.      The consummation of the Transactions did not violate the legal
rights of the lawful holders of any securities issued by FirstEnergy or any
associate company of FirstEnergy.

        This opinion in respect of the proposed Transactions as described in the
Application is subject to the following assumptions or conditions:

                (i)     The authorizations and approvals of the Transactions
                        given by the Boards of Directors and shareholders of
                        FirstEnergy and GPU remained in effect at the closings
                        thereof and the Financing Transactions shall have been
                        conducted in accordance with the applicable
                        authorizations and approvals.

                (ii)    Transactions have been accomplished in accordance with
                        required approvals, authorizations, consents,
                        certificates and orders of all state and federal
                        commissions or regulatory authorities having
                        jurisdiction over any of the Transactions (including,
                        with respect to the Merger, the approval and
                        authorization of the Federal Energy Regulatory
                        Commission under the Federal Power Act, the Federal
                        Communications Commission under the Communications Act,
                        the Nuclear Regulatory Commission under the Atomic
                        Energy Act, the Pennsylvania Public Utility Commission
                        under the applicable laws of the Commonwealth of
                        Pennsylvania, the New Jersey Board of Public Utilities
                        under the applicable laws of New Jersey, the New York
                        Public Service Commission under laws of the State of New
                        York and the Regulatory Entity of Provincial Public
                        Services of the Province of Salta, Argentina) and all
                        such required approvals, authorizations, consents,
                        certificates, orders and registrations remained in
                        effect at the closings thereof.

                (iii)   With respect to those Transactions occurring after
                        FirstEnergy became subject to registration pursuant to
                        Section 5 of the Act and the rules of the Securities and
                        Exchange Commission thereunder, FirstEnergy has duly
                        registered with the Securities and Exchange Commission
                        as a holding company pursuant to Section 5 of the Act
                        and the rules of the Securities and Exchange Commission
                        thereunder.





                (iv)    The Merger has been completed in accordance with the
                        Merger Agreement; instruments of merger shall have been
                        duly and validly filed with the Secretaries of State of
                        the Commonwealth of Pennsylvania and State of Ohio,
                        respectively, and such other corporate formalities as
                        are required by the laws of such jurisdictions for the
                        consummation of the merger contemplated by the Merger
                        Agreement have been taken; and such merger became
                        effective in accordance with the laws of Pennsylvania
                        and Ohio, respectively.

                (v)     The parties have obtained all consents, waivers and
                        releases, if any, required for the Transactions under
                        all applicable governing corporate documents, contracts,
                        agreements, debt instruments, indentures, franchises,
                        licenses and permits.

                (vi)    The documentation necessary for the Financing
                        Transactions shall constitute the valid, binding and
                        enforceable obligations of the parties to such documents
                        other than the FirstEnergy or other issuer thereof (the
                        "Issuers") and each Issuer shall have received the
                        agreed upon consideration for the securities in
                        accordance with the authorizations and approvals
                        referred to in subparagraph (iii) above.

                (vii)   A registration statement shall have been declared
                        effective under the Securities Act of 1933 or an
                        exemption from registration shall be applicable under
                        such act with respect to each Financing Transaction, and
                        no stop order shall have been entered by the Securities
                        and Exchange Commission with respect thereto.

                (viii)  No opinions are expressed with respect to laws other
                        than those of the State of Ohio. I understand that
                        Jones, Day, Reavis & Pogue will rely on this opinion in
                        giving its opinion with respect to the subject matter
                        hereof and I hereby consent to such reliance.

                (ix)    No stop order has been entered by the Securities and
                        Exchange Commission with respect to the Registration
                        Statement on Form S-4 (File No. 333-46444); and the
                        issuance of shares of FirstEnergy common stock in
                        connection with the Merger shall have been consummated
                        in compliance with the Securities Act of 1933 and the
                        rules and regulations thereunder.

                (x)     JCP&L will have received all necessary approvals, if
                        any, from the BPU prior to entering into any financing
                        transaction, participating in the Utility Money Pool or
                        entering into any Anticipatory Hedge or any other
                        interest rate management device, as more fully described
                        in the Application.

                (xi)    I have assumed the genuineness of all signatures and the
                        authenticity of all documents submitted to us as
                        originals and the conformity with the originals of all
                        documents submitted to us as copies. As to various





                        questions of fact material to such opinions I have, when
                        relevant facts were not independently established,
                        relied upon certificates by officers of FirstEnergy, GPU
                        and other appropriate persons and statements contained
                        in the Application.

        I hereby consent to the filing of this opinion as an exhibit to the
Application.



                                       Respectfully yours,

                                       /s/ Leila L. Vespoli

                                       Leila L. Vespoli
                                       Senior Vice President and General Counsel
                                       FirstEnergy Corp.





                                                                   EXHIBIT F-2.3



                          Whiteman Osterman & Hanna LLP
                               One Commerce Plaza
                             Albany, New York 12260
                               Phone: 518-487-7600

                                November 7, 2001


Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549

        Re:     FirstEnergy Corp. and GPU, Inc.;  SEC File No. 70-9793

Ladies and Gentlemen:

                We refer to the Application-Declaration on Form U-1 in File No.
70-9793, as amended (the "Application"), under the Public Utility Holding
Company Act of 1935 (the "Act"), filed by FirstEnergy Corp, an Ohio corporation
("FirstEnergy") and a registered holding company under the Act, and certain
Subsidiaries of FirstEnergy and authorized by order of the Securities and
Exchange Commission (the "Commission") dated October 29, 2001 (the "Order")
granting authority for the following, all as more fully described in the
Application and the Order (the "Transactions"):

        a.      The acquisition by FirstEnergy of all the issued and outstanding
                voting securities of the following U.S. electric utility
                operating subsidiaries of GPU, Inc. ("GPU"): Jersey Central
                Power & Light Company, a New Jersey corporation ("JCP&L"),
                Pennsylvania Electric Company, a Pennsylvania corporation
                ("Penelec") and Metropolitan Edison Company, a Pennsylvania
                corporation ("Met-Ed") and the indirect acquisition of York
                Haven Power Company, a Pennsylvania corporation ("York Haven")
                and Waverly Electric Power & Light Company, a Pennsylvania
                corporation ("Waverly Electric"); such acquisition to be
                accomplished through a merger (the "Merger") of GPU into
                FirstEnergy pursuant to the terms of the Agreement and Plan of
                Merger, dated as of August 8, 2000 (the "Merger Agreement"),
                between FirstEnergy and GPU.

        b.      certain financing transactions by FirstEnergy, and in the
                limited circumstances set out in the Application, by the Utility
                Subsidiaries, in the amount of $8.0 billion; and

        c.      the authorization and approval of certain guarantees and the
                formation and operation of a utility money pool (the "Utility
                Money Pool") and a non-utility money pool (the "Non-Utility
                Money Pool").





        We have acted as counsel to FirstEnergy and GPU in connection with the
filing of the Application. All capitalized terms used herein but not defined
herein shall have the meaning ascribed to them in the Application.

        In connection with this opinion, we have examined the Application and
the exhibits thereto and the Merger Agreement, and originals, or copies
certified to our satisfaction, of such corporate records of the FirstEnergy, GPU
and other entities, certificates of public officials, orders of regulatory
bodies having jurisdiction over aspects of the Transactions, certificates of
officers and representatives of FirstEnergy, GPU and other entities and such
other documents, records and matters of law as we have deemed necessary for the
purposes of this opinion.

        Based on the foregoing, and subject to the assumptions, qualifications
and limitations hereinafter specified, we are of the opinion that the laws of
the State of New York applicable to the Transactions have been complied with.

        This opinion in respect of the proposed Transactions as described in the
Application is subject to the following assumptions or conditions:

                (i)     The authorizations and approvals of the Transactions
                        given by the Boards of Directors and shareholders of
                        FirstEnergy and GPU remained in effect at the closings
                        thereof and the Financing Transactions shall have been
                        conducted in accordance with the applicable
                        authorizations and approvals.

                (ii)    The Transactions shall have been accomplished in
                        accordance with required approvals, authorizations,
                        consents, certificates and orders of all state and
                        federal commissions or regulatory authorities having
                        jurisdiction over any of the Transactions (including,
                        with respect to the Merger, the approval and
                        authorization of the Federal Energy Regulatory
                        Commission under the Federal Power Act, the Nuclear
                        Regulatory Commission under the Atomic Energy Act, the
                        Pennsylvania Public Utility Commission under the
                        applicable laws of the Commonwealth of Pennsylvania, the
                        New Jersey Board of Public Utilities under the
                        applicable laws of New Jersey and the New York Public
                        Service Commission under laws of the State of New York)
                        and all such required approvals, authorizations,
                        consents, certificates, orders and registrations
                        remained in effect at the closings thereof.

                (iii)   With respect to those Transactions occurring after
                        FirstEnergy became subject to registration pursuant to
                        Section 5 of the Act and the rules of the Securities and
                        Exchange Commission thereunder, FirstEnergy has duly
                        registered with the Securities and Exchange Commission
                        as a holding company pursuant to Section 5 of the Act
                        and the rules of the Securities and Exchange Commission
                        thereunder.

                (iv)    The Merger has been completed in accordance with the
                        Merger Agreement; instruments of merger shall have been
                        duly and validly filed with the Secretaries of State of
                        the Commonwealth of Pennsylvania and


                                      -2-



                        State of Ohio, respectively, and such other corporate
                        formalities as are required by the laws of such
                        jurisdictions for the consummation of the merger
                        contemplated by the Merger Agreement have been taken;
                        and such merger became effective in accordance with the
                        laws of Pennsylvania and Ohio, respectively.

                (v)     The parties have obtained all consents, waivers and
                        releases, if any, required for the Transactions under
                        all applicable governing corporate documents, contracts,
                        agreements, debt instruments, indentures, franchises,
                        licenses and permits.

                (vi)    The documentation necessary for the Financing
                        Transactions shall constitute the valid, binding and
                        enforceable obligations of the parties to such documents
                        other than the FirstEnergy or other issuer thereof (the
                        "Issuers") and each Issuer shall have received the
                        agreed upon consideration for the securities in
                        accordance with the authorizations and approvals
                        referred to in subparagraph (iii) above.

                (vii)   A registration statement shall have been declared
                        effective under the Securities Act of 1933 or an
                        exemption from registration shall be applicable under
                        such act with respect to each Financing Transaction, and
                        no stop order shall have been entered by the Securities
                        and Exchange Commission with respect thereto.

                (viii)  No opinions are expressed with respect to laws other
                        than those of the State of New York. We understand that
                        Jones, Day, Reavis & Pogue will rely on this opinion in
                        giving its opinion with respect to the subject matter
                        hereof and we hereby consent to such reliance.

                (ix)    No stop order has been entered by the Securities and
                        Exchange Commission with respect to the Registration
                        Statement on Form S-4 (File No. 333-46444); and the
                        issuance of shares of FirstEnergy common stock in
                        connection with the Merger shall have been consummated
                        in compliance with the Securities Act of 1933 and the
                        rules and regulations thereunder.

                (x)     All necessary action, if any, under state "Blue Sky"
                        laws to permit the consummation of each of the
                        Transactions has been completed prior to consummation of
                        such Transaction.

                (xi)    Penelec and Waverly Electric will have received all
                        necessary approvals, if any, from the New York Public
                        Service Commission prior to entering into any financing
                        transaction, participating in the Utility Money Pool or
                        entering into any Anticipating Hedge or any other
                        interest rate management device, as more fully described
                        in the Application.

                (xii)   We have assumed the genuineness of all signatures and
                        the authenticity of all documents submitted to us as
                        originals and the conformity with the


                                      -3-



                        originals of all documents submitted to us as copies. As
                        to various questions of fact material to such opinions
                        we have, when relevant facts were not independently
                        established, relied upon certificates by officers of
                        FirstEnergy, GPU and other appropriate persons and
                        statements contained in the Application.

        We hereby consent to the filing of this opinion as an exhibit to the
Application.



                                                Respectfully yours,



                                                Whiteman Osterman & Hanna LLP



                                      -4-



                                                                   EXHIBIT F-2.4



                            Thelen, Reid & Priest LLP
                                65 Madison Avenue
                              Morristown, NJ 07960
                               Phone: 973-644-3400

                                November 7, 2001


Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549

        Re:     FirstEnergy Corp. and GPU, Inc.;  SEC File No. 70-9793

Ladies and Gentlemen:

                We refer to our opinion dated October 29, 2001 filed as Exhibit
F-1.4 to Amendment No. 3, dated the same date, to the Application-Declaration on
Form U-1 in File No. 70-9793, as amended (the "Application"), under the Public
Utility Holding Company Act of 1935 (the "Act"), filed with the Securities and
Exchange Commission (the "Commission") by, inter alia, FirstEnergy Corp., an
Ohio corporation ("FirstEnergy") and, as of November 7, 2001, a registered
holding company under the Act, certain Subsidiaries of FirstEnergy. By order
dated October 29, 2001 (the "Order"), the Commission permitted the Application
to become effective and granted authority for, among other things, the following
actions, all as more fully described in the Application and the Order:

        a.      the acquisition by FirstEnergy of all the issued and outstanding
voting securities of the following U.S. electric utility operating subsidiaries
of GPU, Inc. ("GPU"): Jersey Central Power & Light Company, a New Jersey
corporation ("JCP&L"), Pennsylvania Electric Company, a Pennsylvania corporation
and Metropolitan Edison Company, a Pennsylvania corporation and the indirect
acquisition of York Haven Power Company, a Pennsylvania corporation and Waverly
Electric Power & Light Company, a Pennsylvania corporation; such acquisition to
be accomplished through a merger of GPU into FirstEnergy pursuant to the terms
of the Agreement and Plan of Merger, dated as of August 8, 2000, between
FirstEnergy and GPU;

        b.      certain financing transactions by FirstEnergy, and, in the
limited circumstances set out in the Application, by the Utility Subsidiaries,
in an amount of $8.0 billion; and

        c.      the authorization and approval of the formation and operation of
a utility money pool and a non-utility money pool.





        We have acted as counsel to GPU in connection with the filing of the
Application. All capitalized terms used herein but not defined herein shall have
the meaning ascribed to them in the Application.

        In addition to the examination recited in the aforesaid opinion, we have
also examined the Order and FirstEnergy's Certificate of Notification, dated
this date, filed with the Commission pursuant to Rule 24 under the Act
certifying as to the completion certain of the transactions proposed in the
Application for which authority was granted in the Order (the transactions as so
completed being herein referred to as the "Transactions").

        Based on the foregoing, and subject to the assumptions, qualifications
and limitations hereinafter specified, we are of the opinion that the laws of
the State of New Jersey applicable to the Transactions have been complied with.

        This opinion in respect of the Transactions as described in the
Application is subject to the following assumptions or conditions:

                (i)     The parties have obtained all consents, waivers and
                        releases, if any, required for the Transactions under
                        all applicable governing corporate documents, contracts,
                        agreements, debt instruments, indentures, franchises,
                        licenses and permits.

                (ii)    No opinions are expressed with respect to laws other
                        than those of the State of New Jersey.

                (iii)   All action under state "Blue Sky" laws to permit the
                        consummation of the Transactions have been completed.

                (iv)    We have assumed the genuineness of all signatures and
                        the authenticity of all documents submitted to us as
                        originals and the conformity with the originals of all
                        documents submitted to us as copies. As to various
                        questions of fact material to such opinions we have,
                        when relevant facts were not independently established,
                        relied upon certificates by officers of GPU, JCP&L and
                        other appropriate persons and statements contained in
                        the Application.

        We hereby consent to the filing of this opinion as an exhibit to the
aforesaid Certificate of Notification filed pursuant to Rule 24 and in any
proceeding before the Commission that may be held in connection therewith. We
understand that Jones, Day, Reavis & Pogue will rely on this opinion in giving
its opinion with respect to the subject matter hereof and we hereby consent to
such reliance.



                                               Respectfully yours,

                                               THELEN REID & PRIEST LLP


                                      -2-



                                                                   EXHIBIT F-2.5



                       Ryan, Russell, Ogden & Seltzer LLP
                       1100 Berkshire Boulevard, Suite 301
                        Reading, Pennsylvania 19610-1221
                               Phone: 610-372-4761

                                November 7, 2001


Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549

        Re:     FirstEnergy Corp. and GPU, Inc.;  SEC File No. 70-9793

Ladies and Gentlemen:

                We refer to the Application-Declaration on Form U-1 in File No.
70-9793, as amended (the "Application"), under the Public Utility Holding
Company Act of 1935 (the "Act"), filed by FirstEnergy Corp, an Ohio corporation
("FirstEnergy") and a registered holding company under the Act, and certain
Subsidiaries of FirstEnergy and authorized by order of the Securities and
Exchange Commission (the "Commission") dated October 29, 2001 (the "Order")
granting authority for the following, all as more fully described in the
Application and the Order (the "Transactions"):

        a.      the acquisition by FirstEnergy of all the issued and outstanding
                voting securities of the following U.S. electric utility
                operating subsidiaries of GPU, Inc. ("GPU"): Jersey Central
                Power & Light Company, a New Jersey corporation ("JCP&L"),
                Pennsylvania Electric Company, a Pennsylvania corporation
                ("Penelec") and Metropolitan Edison Company, a Pennsylvania
                corporation ("Met-Ed") and the indirect acquisition of York
                Haven Power Company, a Pennsylvania corporation ("York Haven")
                and Waverly Electric Power & Light Company, a Pennsylvania
                corporation ("Waverly Electric"); such acquisition to be
                accomplished through a merger (the "Merger") of GPU into
                FirstEnergy pursuant to the terms of the Agreement and Plan of
                Merger, dated as of August 8, 2000 (the "Merger Agreement"),
                between FirstEnergy and GPU.

        b.      The issuance by FirstEnergy of its common stock in exchange for
                50% of the shares of GPU common stock outstanding at the time
                the Merger is completed, subject to a certain adjustments
                described in the Merger Agreement. The Merger and the issuance
                of common stock in connection therewith are referred to as the
                "Merger Transactions."

        c.      Financing transactions by FirstEnergy, and in the limited
                circumstances set out in the Application, by the Utility
                Subsidiaries, in the amount of $8.0 billion (which





                includes the common stock issued in the Merger) and related
                transactions (the "Financings"), representing additions to
                capital, additional equity securities, preferred securities and
                debt (which amount includes debt required to finance the cash
                portion of the Merger), in each case including refinancings
                which do not alter outstanding capital but which will not count
                against the limits, for the period beginning with the effective
                date of an order issued pursuant to the Application and
                continuing to and including June 30, 2003 (the "Authorization
                Period").

        d.      The issuance of 30 million shares of common stock under dividend
                reinvestment and stock-based management incentive and employee
                benefit plans pursuant to Sections 6(a) and 7 of the Act (the
                "Plan Common Stock issuances").

        e.      The issuance of one purchase right (a "Right") together with
                each share of FirstEnergy common stock issued in accordance with
                the authority requested in the Application.

        f.      The issuance by FirstEnergy and the Subsidiaries of guarantees
                (the "Guarantees") in an aggregate amount not to exceed $4.0
                billion outstanding at any time in exposure.

        g.      The authorization and approval of intra-system guarantees, the
                formation and operation of a utility money pool (the "Utility
                Money Pool") and a non-utility money pool (the "Non-Utility
                Money Pool"). The Financings, the Plan Common Stock issuances,
                the Rights transactions, the Guarantees, the Utility Money Pool
                transactions and Non-Utility Money Pool Transactions are
                referred to as the "Securities Transactions."

        We have acted as Pennsylvania counsel to FirstEnergy and GPU in
connection with the filing of the Application. All capitalized terms used herein
but not defined herein shall have the meaning ascribed to them in the
Application.

        In connection with this opinion, we have examined the Application and
the exhibits thereto and the Merger Agreement, and originals, or copies
certified to our satisfaction, of such corporate records of FirstEnergy, GPU and
other entities, certificates of public officials, orders of regulatory bodies
having jurisdiction over aspects of the Transaction, certificates of officers
and representatives of FirstEnergy, GPU and other entities and such other
documents, records and matters of law as we have deemed necessary for the
purposes of this opinion.

        Based on the foregoing, and subject to the assumptions, qualifications
and limitations hereinafter specified, we are of the opinion that the laws of
the Commonwealth of Pennsylvania applicable to the Transactions have been
complied with.

        This opinion in respect of the proposed Transactions as described in the
Application is subject to the following assumptions or conditions:

                (i)     The authorizations and approvals of the Transactions
                        given by the Boards of Directors and shareholders of
                        FirstEnergy and GPU remained in effect


                                      -2-



                        at the closings thereof and the Financing Transactions
                        shall have been conducted in accordance with the
                        applicable authorizations and approvals.

                (ii)    The Transactions have been accomplished in accordance
                        with required approvals, authorizations, consents,
                        certificates and orders of all state and federal
                        commissions or regulatory authorities having
                        jurisdiction over any of the Transactions (including,
                        with respect to the Merger, the approval and
                        authorization of the Federal Energy Regulatory
                        Commission under the Federal Power Act, the Federal
                        Communications Commission under the Communications Act,
                        the Nuclear Regulatory Commission under the Atomic
                        Energy Act, the Pennsylvania Public Utility Commission
                        ("PaPUC") under the applicable laws of the Commonwealth
                        of Pennsylvania, the New Jersey Board of Public
                        Utilities under the applicable laws of New Jersey and
                        the New York Public Service Commission under laws of the
                        State of New York) and all such required approvals,
                        authorizations, consents, certificates, orders and
                        registrations remained in effect at the closings
                        thereof.

                (iii)   With respect to those Transactions occurring after
                        FirstEnergy became subject to registration pursuant to
                        Section 5 of the Act and the rules of the Securities and
                        Exchange Commission thereunder, FirstEnergy has duly
                        registered with the Securities and Exchange Commission
                        as a holding company pursuant to Section 5 of the Act
                        and the rules of the Securities and Exchange Commission
                        thereunder.

                (iv)    The Merger has been completed in accordance with the
                        Merger Agreement; instruments of merger shall have been
                        duly and validly filed with the Secretaries of State of
                        the Commonwealth of Pennsylvania and State of Ohio,
                        respectively, and such other corporate formalities as
                        are required by the laws of such jurisdictions for the
                        consummation of the merger contemplated by the Merger
                        Agreement have been taken; and such merger became
                        effective in accordance with the laws of Pennsylvania
                        and Ohio, respectively.

                (v)     The parties have obtained all consents, waivers and
                        releases, if any, required for the Transactions under
                        all applicable governing corporate documents, contracts,
                        agreements, debt instruments, indentures, franchises,
                        licenses and permits.

                (vi)    The documentation necessary for the Financing
                        Transactions shall constitute the valid, binding and
                        enforceable obligations of the parties to such documents
                        other than the FirstEnergy or other issuer thereof (the
                        "Issuers") and each Issuer shall have received the
                        agreed upon consideration for the securities in
                        accordance with the authorizations and approvals
                        referred to in subparagraphs (i) and (iii) above.

                (vii)   A registration statement shall have been declared
                        effective under the Securities Act of 1933 or an
                        exemption from registration shall be


                                      -3-



                        applicable under such act with respect to each Financing
                        Transaction and no stop order shall have been entered by
                        the Securities and Exchange Commission with respect
                        thereto.

                (viii)  No opinions are expressed with respect to laws other
                        than those of the Commonwealth of Pennsylvania. We
                        understand that Jones, Day, Reavis & Pogue will rely on
                        this opinion in giving its opinion with respect to the
                        subject matter hereof and we hereby consent to such
                        reliance.

                (ix)    No stop order has been entered by the Securities and
                        Exchange Commission with respect to the Registration
                        Statement on Form S-4 (File No. 333-46444); and the
                        issuance of shares of FirstEnergy common stock in
                        connection with the Merger shall have been consummated
                        in compliance with the Securities Act of 1933 and the
                        rules and regulations thereunder.

                (x)     That all action under state "Blue Sky" laws to permit
                        the consummation of the Transactions have been
                        completed.

                (xi)    Penelec and Met-Ed will have received all necessary
                        approvals, if any, from the PaPUC prior to entering into
                        any financing transaction, participating in the Utility
                        Money Pool or entering into any Anticipatory Hedge or
                        any other interest rate management device, as more fully
                        described in the Application.

                (xii)   We have assumed the genuineness of all signatures and
                        the authenticity of all documents submitted to us as
                        originals and the conformity with the originals of all
                        documents submitted to us as copies. As to various
                        questions of fact material to such opinions we have,
                        when relevant facts were not independently established,
                        relied upon certificates by officers of FirstEnergy, GPU
                        and other appropriate persons and statements contained
                        in the Application.

        We hereby consent to the filing of this opinion as an exhibit to the
Application.



                                              Respectfully yours,



                                              RYAN, RUSSELL, OGDEN & SELTZER LLP


                                      -4-