SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549


In the Matter of             )
Exelon Corporation           )
                             )            File No. 70-9645
(Public Utility Holding      )
Company Act of 1935)         )


                           CERTIFICATE OF NOTIFICATION

         This Certificate of Notification is filed by Exelon Corporation
("Exelon"), a Pennsylvania Corporation, in connection with the following
transactions proposed in Exelon's Form U-1, as amended (the
"Application-Declaration"), and authorized by Order of the Securities and
Exchange Commission (the "Commission") dated October 19, 2000 as supplemented
October 20, 2000 (the "Order"), in this file (Release No. 35-70-9645). This
Certificate of Notification amends and supplements the Certificate of
Notification filed by Exelon on October 26, 2000 and certifies that Exelon has
completed various transactions (the "Restructurings") as set forth in the
Application-Declaration. Capitalized terms used herein without definition have
the meaning ascribed to them in the Application-Declaration or the Amended and
Restated Agreement and Plan of Exchange and Merger between Unicom Corporation
("Unicom") and PECO Energy Company ("PECO")(the "Merger Agreement"). Exelon
Corporation hereby certifies pursuant to Rule 24:

         a. That Exelon has created Genco as the holder of the generating assets
of ComEd and PECO,

         b. that Exelon has created Exelon Energy Delivery Company as a holding
company for ComEd and PECO and their subsidiaries,

         c. that Exelon has created Exelon Ventures Company as a holding company
for Genco and Exelon Enterprises Company LLC ("Enterprises"),

         d. that the Conowingo Companies are direct and indirect subsidiaries of
Genco, and

         e. that Exelon has created Enterprises which holds certain non-utility
subsidiaries of Exelon.

         Attached hereto as Exhibits F-2.1 and F-2.2 we are filing the
past-tense opinion of counsel to Exelon to the Application-Declaration.

            SIGNATURE

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

                                                     Exelon Corporation

                                                     By:/s/ Ruth Ann M. Gillis
                                                        ------------------------
                                                        Ruth Ann M. Gillis
                                                        Senior Vice President

Dated: June 3, 2002






                                                                   Exhibit F-2.1


                           Jones, Day, Reavis & Pogue
                                 77 West Wacker
                          Chicago, Illinois 60601-1692
                 Telephone: 312-782-3939 Facsimile: 312-782-8585


                                  June 3, 2001

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

Re:   Exelon Corporation SEC File No. 70-9645

Dear Sirs:

             We refer to the Application-Declaration on Form U-1 in File No.
70-9645, as amended (the "Application"), under the Public Utility Holding
Company Act of 1935, as amended (the "Act"), filed by Exelon Corporation
("Exelon"), a Pennsylvania corporation and currently a registered holding
company under the Act, and authorized by order of the Securities and Exchange
Commission (the "Commission") dated October 19, 2000 as supplemented October 20,
2000 (the "Order") granting authority for the following (the "Transactions"):

      (a) the acquisition by Exelon of common stock of (i) Commonwealth Edison
          Company ("ComEd"), a subsidiary of Unicom Corporation ("Unicom"), (ii)
          PECO Energy Company ("PECO"), (iii) Exelon Generation Company, LLC and
          (iv) the utility subsidiaries of ComEd and PECO identified in the
          Application;

      (b) the issuance by Exelon of its common stock in exchange for (i) the
          outstanding shares of common stock of PECO in the First Step Share
          Exchange (as defined in the Amended and Restated Agreement and Plan of
          Exchange and Merger between Unicom and PECO (the "Merger Agreement"))
          and (ii) the outstanding shares of common stock of Unicom in the
          Second Step Merger (as defined in the Merger Agreement);

      (c) the adoption of a service agreement to permit, under Section 13 of the
          Act and the rules of the Securities and Exchange Commission
          thereunder, Exelon Business Services Company to render services to
          Exelon's utility and non-utility subsidiaries;

      (d) the transactions (the "Restructurings) which result in (i) the
          creation of Genco as the holder of the generating assets of ComEd and
          PECO, (ii) the creation of Exelon Energy Delivery Company as a holding
          company for ComEd and PECO and their subsidiaries, (iii) the creation
          of Exelon Ventures Company as a holding company for Genco, (iv) the
          Conowingo Companies becoming direct and indirect subsidiaries of



          Genco and (v) the creation of Exelon Enterprises Company LLC which
          will hold Exelon's non-utility subsidiaries;

      (e) the retention by PECO of the gas utility business of PECO as an
          "additional system" within the meaning of Section 11 of the Act; and

      (f) the retention by Exelon directly or indirectly of Unicom's and PECO's
          existing non-utility businesses (to the extent jurisdictional),

all as more fully described in the Application and the Order.

      We have acted as counsel to the Exelon 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 Exelon, Unicom, ComEd, PECO
and other entities, certificates of public officials, orders of regulatory
bodies having jurisdiction over aspects of the Transaction, certificates of
officers and representatives of the Exelon 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.  The laws of the State of Illinois applicable to the Transactions have
          been complied with.

      2.  Exelon legally acquired pursuant to the Second Step Merger all the
          outstanding common stock of ComEd (except for those shares of common
          stock which immediately prior to the Transactions were held by any
          person other than Unicom as described in the Application) and legally
          acquired pursuant to the First Step Share Exchange all the outstanding
          common stock of PECO. Upon completion of the Restructurings, Exelon
          legally acquired all the outstanding common stock of Exelon Energy
          Delivery Company (which in turn legally acquired all the common stock
          of ComEd and PECO held by Exelon) and Exelon Ventures Company legally
          acquired all the ownership interest of Genco.

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

      The opinions expressed above in respect of the Transactions as described
in the Application are subject to the following assumptions or conditions:

          (a) The authorizations and approvals of the Transactions given by the
              Boards of Directors and shareholders of Exelon, Unicom and PECO
              remained in

                                       2



         effect at the closings thereof and such corporate authorizations and
         approvals as required by state law for the Restructurings have been
         given and all such approvals remained in effect at the closings of the
         Restructurings.

      b. 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 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 Service Commission under the
         applicable laws of the Commonwealth of Pennsylvania, and the Illinois
         Commerce Commission under the applicable laws of the State of Illinois)
         and all such required approvals, authorizations, consents,
         certificates, orders and registrations remained in effect at the
         closings thereof.

      c. With respect to those Transactions occurring after Exelon became
         subject to registration pursuant to Section 5 of the Act and the rules
         of the Securities and Exchange Commission thereunder, Exelon 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.

      d. The Merger (which consists of the First Step Share Exchange and the
         Second Step Merger as described in the Merger Agreement) has been
         completed in accordance with the Merger Agreement; instruments of share
         exchange and merger have been duly and validly filed with the
         Secretaries of State of the Commonwealth of Pennsylvania and Illinois,
         respectively, and such other corporate formalities as are required by
         the laws of such jurisdictions for the consummation of the share
         exchange and merger contemplated by the Merger Agreement have been
         taken; and such share exchange and merger became effective in
         accordance with the laws of Pennsylvania and Illinois, respectively.

      e. 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.

      f. Each of Genco, Exelon Energy Delivery Company and Exelon Ventures
         Company has been validly organized and is duly existing under the laws
         of the jurisdiction under which it is created.

      g. No opinions are expressed with respect to laws other than those of the
         State of Illinois, the Commonwealth of Pennsylvania and U.S. federal
         law. With respect to all matters governed by the laws of the
         Commonwealth of

                                       3



         Pennsylvania, we have relied on the opinion of Ballard Spahr Andrews &
         Ingersoll, LLP dated the date hereof. We understand that Ballard Spahr
         Andrews & Ingersoll, LLP will rely on our opinion with respect to all
         matters governed by the laws of the State of Illinois and we consent to
         such reliance. With respect to the opinion in paragraph number 3 above,
         we express no opinion with respect to any affiliate of Exelon which was
         an affiliate of PECO immediately prior to the First Step Share
         Exchange.

      h. No stop order has been entered by the Securities and Exchange
         Commission with respect to the Registration Statement on Form S-4 (File
         No. 333-37082); and the issuance of shares of Exelon common stock in
         connection with the Transactions has been consummated in compliance
         with the Securities Act of 1933, as amended, and the rules and
         regulations thereunder.

      i. 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 Exelon, Unicom, ComEd or PECO 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

                     Ballard Spahr Andrews & Ingersoll, LLP
                                   51st Floor
                               1735 Market Street
                           Philadelphia, PA 19103-7599

                                  June 3, 2002

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

         Re:  Exelon Corporation SEC File No.  70-9645
              ----------------------------------------
Ladies and Gentlemen:

         We refer to the Application-Declaration on Form U-1 in File No.
70-9645, as amended (the "Application"), under the Public Utility Holding
Company Act of 1935, as amended (the "Act"), filed by Exelon Corporation
("Exelon"), currently a registered holding company under the Act, and authorized
by order of the Securities and Exchange Commission (the "Commission") dated
October 19, 2000 as amended October 20, 2000 (the "Order") granting authority
for the following (the "Transactions"):

         (a) the acquisition by Exelon of (i) common stock of Commonwealth
Edison Company ("ComEd"), a subsidiary of Unicom Corporation ("Unicom"), (ii)
common stock of PECO Energy Company ("PECO"), (iii) membership interests in
Exelon Generation Company, LLC and (iv) stock and other membership interests in
the utility subsidiaries of ComEd and PECO identified in the Application;

         (b) the issuance by Exelon of its common stock in exchange for (i) the
outstanding shares of common stock of PECO in the First Step Share Exchange (as
defined in the Amended and Restated Agreement and Plan of Exchange and Merger
between Unicom and PECO dated September 22, 1999, as amended to date (the
"Merger Agreement"), which was filed as an exhibit to the Application and (ii)
the outstanding shares of common stock of Unicom in the Second Step Merger (as
defined in the Merger Agreement);

         (c) the adoption of a service agreement to permit, under Section 13 of
the Act and the rules of the Securities and Exchange Commission thereunder,
Exelon Business Services Company to render services to Exelon's utility and
non-utility subsidiaries;

         (d) the transactions (the "Restructurings) which result in (i) the
creation of Exelon Generation Company, LLC as the holder of the generating
assets of ComEd and PECO, (ii) the creation of Exelon Energy Delivery Company,
LLC as a holding company for ComEd and PECO and their subsidiaries, (iii) the
creation of Exelon Ventures Company as a holding company for Exelon Generation
Company, LLC, (iv) the Conowingo Companies becoming direct and indirect
subsidiaries of Exelon Generation Company, LLC and (v) the creation of Exelon
Enterprises Company LLC which will hold Exelon's non-utility subsidiaries;



June 3, 2002
Page 2

         (e) the retention by PECO of the gas utility business of PECO as an
"additional system" within the meaning of Section 11 of the Act; and

         (f) the retention by Exelon directly or indirectly of Unicom's and
PECO's existing non-utility businesses (to the extent jurisdictional),

all as more fully described in the Application and the Order.

         We have acted as Pennsylvania counsel to Exelon and PECO in connection
with the Merger. Each capitalized term used herein but not defined herein shall
have the meaning given to such term in the Application.

         In our capacity as Pennsylvania counsel, 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 Exelon,
Unicom, ComEd, PECO and other entities, certificates of public officials, orders
of regulatory bodies having jurisdiction over aspects of the Transaction,
certificates of officers and representatives of the Exelon 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. The laws of the Commonwealth of Pennsylvania applicable to the
Transactions have been complied with.

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

         3. The common stock issued by Exelon in the First Step Share Exchange
in exchange for the common stock of PECO and in the Second Step Merger in
exchange for the common stock of Unicom has been validly issued and is fully
paid and nonassessable and the holders thereof are entitled to the rights and
privileges appertaining thereto set forth in the Amended and Restated Articles
of Incorporation of Exelon.

         4. Exelon legally acquired pursuant to the Second Step Merger all the
outstanding common stock of ComEd (except for those shares of common stock which
immediately prior to the Transactions were held by any person other than Unicom
as described in the Application) and legally acquired pursuant to the First Step
Share Exchange all the outstanding common stock of PECO. Upon completion of the
Restructurings, Exelon legally



June 3, 2002
Page 3

acquired all the outstanding common stock of Exelon Energy Delivery Company
(which in turn legally acquired all the common stock of ComEd and PECO held by
Exelon) and Exelon Ventures Company acquired all the ownership interest in
Exelon Generation Company, LLC.

         5. The consummation of the Transactions did not violate the legal
rights of the lawful holders of any securities issued by Exelon or any associate
company of Exelon, provided that no opinion is issued with respect those
companies associated with Unicom.

         The opinions expressed above in respect of the proposed Transactions as
described in the Application are subject to the following assumptions or
conditions:

            a. The authorizations and approvals of the Transactions given by the
Boards of Directors and shareholders of Exelon, Unicom and PECO remained in
effect at the closings of the Transactions and such corporate authorizations and
approvals as shall be required by state law for the Restructurings shall have
been given and all such approvals remained in effect at the closings of the
Restructurings.

            b. 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 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, and
the Illinois Commerce Commission under the applicable laws of the State of
Illinois) and all such required approvals, authorizations, consents,
certificates, orders and registrations remained in effect at the closings of the
Transactions.

            c. With respect to those Transactions occurring after Exelon became
subject to registration pursuant to Section 5 of the Act and the rules of the
Securities and Exchange Commission thereunder, Exelon 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.

            d. The Merger (which consists of the First Step Share Exchange and
the Second Step Merger as described in the Merger Agreement) has been completed
in accordance with the Merger Agreement; instruments of share exchange and
merger have been duly and validly filed with the Secretaries of State of the
Commonwealth of Pennsylvania and the state of Illinois, respectively, and such
other corporate formalities as are required by the laws of such jurisdictions
for the consummation of the share exchange and merger contemplated by



June 3, 2002
Page 4

the Merger Agreement shall have been taken; and such share exchange and merger
shall have became effective in accordance with the laws of Pennsylvania and
Illinois, respectively.

            e. The parties shall 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.

            f. Each of Genco, Exelon Energy Delivery Company and Exelon Ventures
Company has been validly organized and is duly existing under the laws of the
jurisdiction under which it is created.

            g. No stop order has been entered by the Securities and Exchange
Commission with respect to the Registration Statement on Form S-4 (File No.
333-37082); and the issuance of shares of Exelon common stock in connection with
the Transactions has been consummated in compliance with the Securities Act of
1933, as amended, and the rules and regulations thereunder.

       No opinions are expressed with respect to laws other than those of the
Commonwealth Pennsylvania and federal law of the United States and with respect
to all matters governed by the laws of the State of Illinois we have relied on
the opinion of Jones, Day, Reavis & Pogue dated the date hereof with respect to
such matters. We understand that Jones, Day, Reavis & Pogue will rely on our
opinion with respect to all matters governed by the laws of the Commonwealth of
Pennsylvania and we consent to such reliance. With respect to the opinion in
paragraph number 5 above, we express no opinion with respect to any affiliate of
Exelon which was an affiliate of Unicom immediately prior to the Second Step
Merger.

       We have assumed the genuineness of all signatures and the authenticity of
all documents submitted to us as originals and the conformity to the originals
of all documents submitted to us as copies. As to various questions of fact
material to our opinions we have, when relevant facts were not independently
established, relied upon certificates by officers of Exelon, Unicom, ComEd or
PECO 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.

                                        Very truly yours,


                                        Ballard Spahr Andrews & Ingersoll, LLP