Document:

<PAGE>

                                                                     EXHIBIT 4-4

This instrument was prepared by,
and when recorded should be
returned to:

Richard W. Astle
Sidley Austin Brown & Wood
Bank One Plaza
10 South Dearborn Street
Chicago, Illinois 60603

                         FORM OF SUPPLEMENTAL INDENTURE

                                   ----------

                          Dated as of _______ __, 200_

                                   ----------

                           COMMONWEALTH EDISON COMPANY

                                       to

                            BNY MIDWEST TRUST COMPANY

                                       and

                                  D. G. DONOVAN

             Trustees under Mortgage Dated July 1, 1923, and Certain
                         Indentures Supplemental Thereto

                                   ----------

                            Providing for Issuance of

                    FIRST MORTGAGE _____% BONDS, SERIES ____
                               DUE ______ __, 20__
<PAGE>
      THIS SUPPLEMENTAL INDENTURE, dated as of ________ __, 200_, between
COMMONWEALTH EDISON COMPANY, a corporation organized and existing under the laws
of the State of Illinois (hereinafter called the "Company") having an address at
10 South Dearborn Street, 37th floor, Chicago, Illinois 60603, party of the
first part, and BNY MIDWEST TRUST COMPANY, a trust company organized and
existing under the laws of the State of Illinois having an address at 2 North
LaSalle Street, Suite 1020, Chicago, Illinois 60602, and D.G. DONOVAN, an
individual having an address at 2 North LaSalle Street, Suite 1020, Chicago,
Illinois 60602, as Trustee and Co-Trustee, respectively, under the Mortgage of
the Company dated July 1, 1923, as amended and supplemented by Supplemental
Indenture dated August 1, 1944 and the subsequent supplemental indentures
hereinafter mentioned, parties of the second part (said Trustee being
hereinafter called the "Trustee", the Trustee and said Co-Trustee being
hereinafter together called the "Trustees", and said Mortgage dated July 1,
1923, as amended and supplemented by said Supplemental Indenture dated August 1,
1944 and subsequent supplemental indentures, being hereinafter called the
"Mortgage"),

                              W I T N E S S E T H:

      WHEREAS, the Company duly executed and delivered the Mortgage to provide
for the issue of, and to secure, its bonds, issuable in series and without limit
as to principal amount except as provided in the Mortgage; and

      WHEREAS, the Company from time to time has executed and delivered
supplemental indentures to the Mortgage to provide for (i) the creation of
additional series of bonds secured by the Mortgage, (ii) the amendment of
certain of the terms and provisions of the Mortgage and (iii) the confirmation
of the lien of the Mortgage upon property of the Company, such supplemental
indentures that are currently effective and the respective dates, parties
thereto and purposes thereof, being as follows:

<TABLE>
<CAPTION>
    SUPPLEMENTAL
    INDENTURE
    DATE                   PARTIES                                             PROVIDING FOR
<S>                        <C>                                                 <C>
    August 1, 1944         Company to Continental Illinois National Bank       Amendment and restatement of
                           and Trust Company of Chicago and Edmond B.          Mortgage dated July 1, 1923
                           Stofft, as Trustee and Co-Trustee

    August 1, 1946         Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and Edmond B.
                           Stofft, as Trustee and Co-Trustee

    April 1, 1953          Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and Edmond B.
                           Stofft, as Trustee and Co-Trustee

    March 31, 1967         Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and Edward J.
                           Friedrich, as Trustee and Co-Trustee
</TABLE>

                                      -1-
<PAGE>
<TABLE>
<CAPTION>
    SUPPLEMENTAL
    INDENTURE
    DATE                   PARTIES                                             PROVIDING FOR
<S>                        <C>                                                 <C>
    April 1, 1967          Company to Continental Illinois National Bank       Amendment of Sections 3.01, 3.02,
                           and Trust Company of Chicago and Edward J.          3.05 and 3.14 of the Mortgage and
                           Friedrich, as Trustee and Co-Trustee                issuance of First Mortgage 5-3/8%
                                                                               Bonds, Series Y
    February 28, 1969      Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and Donald W.
                           Alfvin, as Trustee and Co-Trustee

    May 29, 1970           Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and Donald W.
                           Alfvin, as Trustee and Co-Trustee

    June 1, 1971           Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and Donald W.
                           Alfvin, as Trustee and Co-Trustee

    April 1, 1972          Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and Donald W.
                           Alfvin, as Trustee and Co-Trustee

    May 31, 1972           Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and Donald W.
                           Alfvin, as Trustee and Co-Trustee

    June 15, 1973          Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and Donald W.
                           Alfvin, as Trustee and Co-Trustee

    May 31, 1974           Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and Donald W.
                           Alfvin, as Trustee and Co-Trustee

    June 13, 1975          Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and Donald W.
                           Alfvin, as Trustee and Co-Trustee

    May 28, 1976           Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and Donald W.
                           Alfvin, as Trustee and Co-Trustee

    June 3, 1977           Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and Donald W.
                           Alfvin, as Trustee and Co-Trustee

    May 17, 1978           Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and Donald W.
                           Alfvin, as Trustee and Co-Trustee

    August 31, 1978        Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and Donald W.
                           Alfvin, as Trustee and Co-Trustee
</TABLE>

                                      -2-
<PAGE>
<TABLE>
<CAPTION>
    SUPPLEMENTAL
    INDENTURE
    DATE                   PARTIES                                             PROVIDING FOR
<S>                        <C>                                                 <C>
    June 18, 1979          Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and Donald W.
                           Alfvin, as Trustee and Co-Trustee

    June 20, 1980          Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and Donald W.
                           Alfvin, as Trustee and Co-Trustee

    April 16, 1981         Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and Donald W.
                           Alfvin, as Trustee and Co-Trustee

    April 30, 1982         Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and Donald W.
                           Alfvin, as Trustee and Co-Trustee

    April 15, 1983         Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and Donald W.
                           Alfvin, as Trustee and Co-Trustee

    April 13, 1984         Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and Donald W.
                           Alfvin, as Trustee and Co-Trustee

    April 15, 1985         Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and Donald W.
                           Alfvin, as Trustee and Co-Trustee

    April 15, 1986         Company to Continental Illinois National Bank       Confirmation of mortgage lien
                           and Trust Company of Chicago and M.J. Kruger,
                           as Trustee and Co-Trustee

    June 15, 1990          Company to Continental Bank, National               Issuance of First Mortgage 9-7/8%
                           Association and M.J. Kruger, as Trustee and         Bonds, Series 75
                           Co-Trustee

    June 1, 1991           Company to Continental Bank, National               Issuance of First Mortgage Bonds,
                           Association and M.J. Kruger, as Trustee and         Pollution Control Series 1991
                           Co-Trustee

    October 15, 1991       Company to Continental Bank, National               Issuance of First Mortgage 8-3/8%
                           Association and M.J. Kruger, as Trustee and         Bonds, Series 78 and First
                           Co-Trustee                                          Mortgage 9-1/8% Bonds, Series 79

    February 1, 1992       Company to Continental Bank, National               Issuance of First Mortgage 7%
                           Association and M.J. Kruger, as Trustee and         Bonds, Series 80 and First
                           Co-Trustee                                          Mortgage 8-5/8% Bonds, Series 81

    May 15, 1992           Company to Continental Bank, National               Issuance of First Mortgage 6-1/8%
                           Association and M.J. Kruger, as Trustee and         Bonds, Series 82 and First
                           Co-Trustee                                          Mortgage 8% Bonds, Series 83

    July 15, 1992          Company to Continental Bank, National               Issuance of First Mortgage 8-1/2%
                           Association and M.J. Kruger, as Trustee and         Bonds, Series 84
                           Co-Trustee
</TABLE>

                                      -3-
<PAGE>
<TABLE>
<CAPTION>
    SUPPLEMENTAL
    INDENTURE
    DATE                   PARTIES                                             PROVIDING FOR
<S>                        <C>                                                 <C>
    September 15, 1992     Company to Continental Bank, National               Issuance of First Mortgage 7-3/8%
                           Association and M.J. Kruger, as Trustee and         Bonds, Series 85 and First
                           Co-Trustee                                          Mortgage 8-3/8% Bonds, Series 86

    February 1, 1993       Company to Continental Bank, National               Issuance of First Mortgage 8-3/8%
                           Association and M.J. Kruger, as Trustee and         Bonds, Series 88
                           Co-Trustee

    April 1, 1993          Company to Continental Bank, National               Issuance of First Mortgage 6-1/2%
                           Association and M.J. Kruger, as Trustee and         Bonds, Series 90 and First
                           Co-Trustee                                          Mortgage 8% Bonds, Series 91

    April 15, 1993         Company to Continental Bank, National               Issuance of First Mortgage 7-5/8%
                           Association and M.J. Kruger, as Trustee and         Bonds, Series 92
                           Co-Trustee

    June 15, 1993          Company to Continental Bank, National               Issuance of First Mortgage 7%
                           Association and M.J. Kruger, as Trustee and         Bonds, Series 93 and First
                           Co-Trustee                                          Mortgage 7-1/2% Bonds, Series 94

    July 15, 1993          Company to Continental Bank, National               Issuance of First Mortgage 6-5/8%
                           Association and M.J. Kruger, as Trustee and         Bonds, Series 96 and First
                           Co-Trustee                                          Mortgage 7-3/4% Bonds, Series 97

    January 15, 1994       Company to Continental Bank, National               Issuance of First Mortgage Bonds,
                           Association and M.J. Kruger, as Trustee and         Pollution Control Series 1994A,
                           Co-Trustee                                          1994B and 1994C

    December 1, 1994       Company to Bank of America Illinois and             Issuance of First Mortgage Bonds,
                           Robert J. Donahue, as Trustee and Co-Trustee        Pollution Control Series 1994D

    June 1, 1996           Company to Harris Trust and Savings Bank and        Issuance of First Mortgage Bonds,
                           D.G. Donovan, as Trustee and Co-Trustee             Pollution Control Series 1996A and
                                                                               1996B

    March 1, 2002          Company to BNY Midwest Trust Company and D.G.       Issuance of First Mortgage 6.15%
                           Donovan, as Trustee and Co-Trustee                  Bonds, Series 98

    May 20, 2002           Company to BNY Midwest Trust Company and D.G.       Issuance of First Mortgage Bonds,
                           Donovan, as Trustee and Co-Trustee                  Pollution Control Series 2002

    June 1, 2002           Company to BNY Midwest Trust Company and D.G.       Issuance of Additional First
                           Donovan, as Trustee and Co-Trustee                  Mortgage 6.15% Bonds, Series 98
</TABLE>

   [List any additional supplemental indentures]

                                      -4-
<PAGE>
      WHEREAS, the respective designations, maturity dates and principal amounts
of the bonds of each series presently outstanding under, and secured by, the
Mortgage and the several supplemental indentures above referred to, are as
follows:

<TABLE>
<CAPTION>
             DESIGNATION                                 MATURITY DATE                         PRINCIPAL AMOUNT
             -----------                                 -------------                         ----------------
<S>                                                    <C>                                     <C>
First Mortgage 9-7/8% Bonds, Series 75                 June 15, 2020                           $   54,171,000
First Mortgage 8-1/4% Bonds, Series 76                 October 1, 2006                            100,000,000
First Mortgage 8-3/8% Bonds, Series 78                 October 15, 2006                           125,000,000
First Mortgage 8% Bonds, Series 83                     May 15, 2008                               140,000,000
First Mortgage 8-1/2% Bonds, Series 84                 July 15, 2022                              200,000,000
First Mortgage 7-3/8% Bonds, Series 85                 September 15, 2002                         200,000,000
First Mortgage 8-3/8% Bonds, Series 86                 September 15, 2022                         200,000,000
First Mortgage 8-3/8% Bonds, Series 88                 February 15, 2023                          235,950,000
First Mortgage 8% Bonds, Series 91                     April 15, 2023                             160,000,000
First Mortgage 7-5/8% Bonds, Series 92                 April 15, 2013                             218,500,000
First Mortgage 7% Bonds, Series 93                     July 1, 2005                               225,000,000
First Mortgage 7-1/2% Bonds, Series 94                 July 1, 2013                               147,000,000
First Mortgage 6-5/8% Bonds, Series 96                 July 15, 2003                              100,000,000
First Mortgage 7-3/4% Bonds, Series 97                 July 15, 2023                              150,000,000
First Mortgage 5.3% Bonds, Pollution                   January 15, 2004                            26,000,000
Control Series 1994A
First Mortgage 5.7% Bonds, Pollution                   January 15, 2009                            20,000,000
Control Series 1994B
First Mortgage 5.85% Bonds, Pollution                  January 15, 2014                            20,000,000
Control Series 1994C
First Mortgage 6.75% Bonds, Pollution                  March 1, 2015                               91,000,000
Control Series 1994D
First Mortgage 4.4% Bonds, Pollution                   December 1, 2006                           110,000,000
Control Series 1996A
First Mortgage 4.4% Bonds, Pollution                   December 1, 2006                            89,400,000
Control Series 1996B
First Mortgage 6.15% Bonds, Series 98                  March 15, 2012                             400,000,000
First Mortgage Bonds, Pollution                        April 15, 2013                             100,000,000
Control Series 2002
</TABLE>

                                      -5-
<PAGE>
<TABLE>
<CAPTION>
             DESIGNATION                                 MATURITY DATE                         PRINCIPAL AMOUNT
             -----------                                 -------------                         ----------------
<S>                                                    <C>                                     <C>
First Mortgage 6.15% Bonds, Series 98                  March 15, 2012                             200,000,000
                                                                                                -------------
                                                       Total                                    $
                                                                                                =============
</TABLE>

  [List any additional supplemental indentures]

      WHEREAS, the Mortgage provides for the issuance from time to time
thereunder, in series, of bonds of the Company for the purposes and subject to
the limitations therein specified; and

      WHEREAS, the Company desires, by this Supplemental Indenture, to create an
additional series of bonds to be issuable under the Mortgage, such bonds to be
designated "First Mortgage ____% Bonds, Series ____" (hereinafter called the
"bonds of Series ____") and the terms and provisions to be contained in the
bonds of Series ____ or to be otherwise applicable thereto to be as set forth in
this Supplemental Indenture; and

      WHEREAS, the bonds of Series ____ and the Trustee's certificate to be
endorsed thereon shall be substantially in the form of the General Form of
Registered Bond Without Coupons and the form of the General Form of Trustee's
Certificate set forth in Section 3.05 of the Supplemental Indenture dated August
1, 1944 to the Mortgage with such appropriate insertions, omissions and
variations in order to express the designation, date, maturity date, annual
interest rate, record dates for, and dates of, payment of interest,
denominations, terms of redemption and redemption prices, and other terms and
characteristics authorized or permitted by the Mortgage or not inconsistent
therewith; and

      WHEREAS, the Company is legally empowered and has been duly authorized by
the necessary corporate action and by order of the Illinois Commerce Commission
to make, execute and deliver this Supplemental Indenture, and to create, as an
additional series of bonds of the Company, the bonds of Series ____, and all
acts and things whatsoever necessary to make this Supplemental Indenture, when
executed and delivered by the Company and the Trustees, a valid, binding and
legal instrument, and to make the bonds of Series ____, when authenticated by
the Trustee and issued as in the Mortgage and in this Supplemental Indenture
provided, the valid, binding and legal obligations of the Company, entitled in
all respects to the security of the Mortgage, as amended and supplemented, have
been done and performed;

      NOW, THEREFORE, in consideration of the premises and of the sum of one
dollar duly paid by the Trustees to the Company, and for other good and valuable
consideration, the receipt of which is hereby acknowledged, the parties hereto
do hereby agree as follows:

      SECTION 1. DESIGNATION AND ISSUANCE OF BONDS OF SERIES ____. The bonds of
Series ____ shall, as hereinbefore recited, be designated as the Company's
"First Mortgage ____%

                                      -6-
<PAGE>
Bonds, Series ____." Subject to the provisions of the Mortgage, the bonds of
Series ____ shall be issuable without limitation as to the aggregate principal
amount thereof.

      SECTION 2. FORM, DATE, MATURITY DATE, INTEREST RATE AND INTEREST PAYMENT
DATES OF BONDS OF SERIES ____. (a) The definitive bonds of Series ____ shall be
in engraved, lithographed, printed or typewritten form and shall be registered
bonds without coupons; and such bonds and the Trustee's certificate to be
endorsed thereon shall be substantially in the forms hereinbefore recited,
respectively. The bonds of Series ____ shall be dated as provided in Section
3.01 of the Mortgage, as amended by Supplemental Indenture dated April 1, 1967.

      (b) The bonds of Series ____ shall mature on _________ __, 20__.

      (c) The bonds of Series ____ shall bear interest at the rate of ____% per
annum until the principal thereof shall be paid.

      (d) Interest on the bonds of Series ____ shall be payable semi-annually on
the ________ day of ______ and the ________ day of ________ in each year,
commencing ________ __, 200_. __________ and __________ in each year are hereby
established as record dates for the payment of interest payable on the next
succeeding interest payment dates, respectively. The interest on each bond of
Series ____ so payable on any interest payment date shall, subject to the
exceptions provided in Section 3.01 of the Mortgage, as amended by said
Supplemental Indenture dated April 1, 1967, be paid to the person in whose name
such bond is registered at the close of business on the __________ or _________,
as the case may be, next preceding such interest payment date.

      SECTION 3. EXECUTION OF BONDS OF SERIES ____. The bonds of Series ____
shall be executed on behalf of the Company by its President or one of its Vice
Presidents, manually or by facsimile signature, and shall have its corporate
seal affixed thereto or a facsimile of such seal imprinted thereon, attested by
its Secretary or one of its Assistant Secretaries, manually or by facsimile
signature, all as may be provided by resolution of the Board of Directors of the
Company. In case any officer or officers whose signature or signatures, manual
or facsimile, shall appear upon any bond of Series ____ shall cease to be such
officer or officers before such bond shall have been actually authenticated and
delivered, such bond nevertheless may be issued, authenticated and delivered
with the same force and effect as though the person or persons whose signature
or signatures, manual or facsimile, appear thereon had not ceased to be such
officer or officers of the Company.

      SECTION 4. MEDIUM AND PLACES OF PAYMENT OF PRINCIPAL OF AND INTEREST ON
BONDS OF SERIES ____; TRANSFERABILITY AND EXCHANGEABILITY. Both the principal of
and interest on the bonds of Series ____ shall be payable in any coin or
currency of the United States of America which at the time of payment is legal
tender for the payment of public and private debts, and both such principal and
interest shall be payable at the office or agency of the Company in the City of
Chicago, State of Illinois, or, at the option of the registered owner, at the
office or agency of the

                                      -7-
<PAGE>
Company in the Borough of Manhattan, The City of New York, State of New York,
and such bonds shall be transferable and exchangeable, in the manner provided in
Sections 3.09 and 3.10 of the Mortgage, at said office or agency. No charge
shall be made by the Company to the registered owner of any bond of Series ____
for the transfer of such bond or for the exchange thereof for bonds of other
authorized denominations, except, in the case of transfer, a charge sufficient
to reimburse the Company for any stamp or other tax or governmental charge
required to be paid by the Company or the Trustee.

      SECTION 5. DENOMINATIONS AND NUMBERING OF BONDS OF SERIES ____. The bonds
of Series ____ shall be issued in the denomination of $1,000 and in such
multiples of $1,000 as shall from time to time hereafter be determined and
authorized by the Board of Directors of the Company or by any officer or
officers of the Company authorized to make such determination, the authorization
of the denomination of any bond of Series ____ to be conclusively evidenced by
the execution thereof on behalf of the Company. Bonds of Series ____ shall be
numbered R-1 and consecutively upwards.

      SECTION 6. TEMPORARY BONDS OF SERIES ____. Until definitive bonds of
Series ____ are ready for delivery, there may be authenticated and issued in
lieu of any thereof and subject to all of the provisions, limitations and
conditions set forth in Section 3.11 of the Mortgage, temporary registered bonds
without coupons of Series ____.

SECTION 7.  REDEMPTION OF BONDS OF SERIES ____.

      [Insert redemption provisions, if applicable]

      SECTION 8. BOOK-ENTRY ONLY SYSTEM. It is intended that the bonds of Series
____ be registered so as to participate in the securities depository system (the
"DTC System") with The Depository Trust Company ("DTC"), as set forth herein.
The bonds of Series ____ shall be initially issued in the form of a fully
registered bond or bonds in the name of Cede & Co., or any successor thereto, as
nominee for DTC. The Company and the Trustees are authorized to execute and
deliver such letters to or agreements with DTC as shall be necessary to
effectuate the DTC System, including the Letter of Representations from the
Company and the Trustees to DTC relating to the bonds of Series ____ (the
"Representation Letter"). In the event of any conflict between the terms of the
Representation Letter and the Mortgage, the terms of the Mortgage shall control.
DTC may exercise the rights of a bondholder only in accordance with the terms
hereof applicable to the exercise of such rights.

      With respect to bonds of Series ____ registered in the name of DTC or its
nominee, the Company and the Trustees shall have no responsibility or obligation
to any broker-dealer, bank or other financial institution for which DTC holds
such bonds from time to time as securities depository (each such broker-dealer,
bank or other financial institution being referred to herein as a "Depository
Participant") or to any person on behalf of whom such a Depository Participant
holds an interest in such bonds (each such person being herein referred to as an
"Indirect

                                      -8-
<PAGE>
Participant"). Without limiting the immediately preceding sentence, the Company
and the Trustees shall have no responsibility or obligation with respect to:

            (i)   the accuracy of the records of DTC, its nominee or any
      Depository Participant with respect to any ownership interest in the
      bonds of Series ____,

            (ii) the delivery to any Depository Participant or any Indirect
      Participant or any other person, other than a registered owner of a bond
      of Series ____, of any notice with respect to the bonds of Series ____,
      including any notice of redemption,

            (iii) the payment to any Depository Participant or Indirect
      Participant or any other person, other than a registered owner of a bond
      of Series ____, of any amount with respect to principal of, redemption
      premium, if any, on, or interest on, the bonds of Series ____, or

            (iv) any consent given by DTC as registered owner.

So long as certificates for the bonds of Series ____ are not issued as
hereinafter provided, the Company and the Trustees may treat DTC or any
successor securities depository as, and deem DTC or any successor securities
depository to be, the absolute owner of such bonds for all purposes whatsoever,
including, without limitation, (1) the payment of principal and interest on such
bonds, (2) giving notice of matters (including redemption) with respect to such
bonds and (3) registering transfers with respect to such bonds. While a bond of
Series ____ is in the DTC System, no person other than DTC or its nominee shall
receive a certificate with respect to such bond.

      In the event that:

            (a) DTC notifies the Company that it is unwilling or unable to
      continue as depositary or if DTC ceases to be a clearing agency registered
      under applicable law and a successor depositary is not appointed by the
      Company within 90 days,

            (b) the Company determines that the beneficial owners of the bonds
      of Series ____ should be able to obtain certificated bonds and so notifies
      the Trustees in writing or

            (c) there shall have occurred and be continuing a completed default
      or any event which after notice or lapse of time or both would be a
      completed default with respect to the bonds of Series ____,

the bonds of Series ____ shall no longer be restricted to being registered in
the name of DTC or its nominee. In the case of clause (a) of the preceding
sentence, the Company may determine that the bonds of Series ____ shall be
registered in the name of and deposited with a successor depository operating a
securities depository system, as may be acceptable to the Company and the
Trustees, or such depository's agent or designee, and if the Company does not
appoint a

                                      -9-
<PAGE>
successor securities depository system within 90 days, then the bonds may be
registered in whatever name or names registered owners of bonds transferring or
exchanging such bonds shall designate, in accordance with the provisions hereof.

      Notwithstanding any other provision of the Mortgage to the contrary, so
long as any bond of Series ____ is registered in the name of DTC or its nominee,
all payments with respect to principal of and interest on such bond and all
notices with respect to such bond shall be made and given, respectively, in the
manner provided in the Representation Letter.

      SECTION 9.  LEGENDS.  So long as the bonds of Series ____ are held by
the Depository Trust Company, such bonds of Series ____ shall bear the
following legend:

            Unless this bond is presented by an authorized representative of the
      Depository Trust Company, a New York corporation ("DTC"), to the Company
      or its agent for registration of transfer, exchange or payment, and any
      bond issued is registered in the name of Cede & Co. or in such other name
      as is requested by an authorized representative of DTC (and any payment is
      made to Cede & Co. or to such other entity as is requested by an
      authorized representative of DTC), any transfer, pledge or other use
      hereof for value or otherwise by a person is wrongful inasmuch as the
      registered owner hereof, Cede & Co., has an interest herein.

      SECTION 10. CONFIRMATION OF LIEN. The Company, for the equal and
proportionate benefit and security of the holders of all bonds at any time
issued under the Mortgage, hereby confirms the lien of the Mortgage upon, and
hereby grants, bargains, sells, transfers, assigns, pledges, mortgages, warrants
and conveys unto the Trustees, all property of the Company and all property
hereafter acquired by the Company, other than (in each case) property which, by
virtue of any of the provisions of the Mortgage, is excluded from such lien, and
hereby confirms the title of the Trustees (as set forth in the Mortgage) in and
to all such property. Without in any way limiting or restricting the generality
of the foregoing, there is specifically included within the confirmation of lien
and title hereinabove expressed the property of the Company legally described on
Exhibit A attached hereto and made a part hereof. A copy of the August 1, 1944
Supplemental Indenture is attached hereto as Exhibit B.

      SECTION 11. MISCELLANEOUS. The terms and conditions of this Supplemental
Indenture shall be deemed to be a part of the terms and conditions of the
Mortgage for any and all purposes. The Mortgage, as supplemented by said
indentures supplemental thereto dated subsequent to August 1, 1944 and referred
to in the recitals of this Supplemental Indenture, and as further supplemented
by this Supplemental Indenture, is in all respects hereby ratified and
confirmed.

      This Supplemental Indenture shall bind and, subject to the provisions of
Article XIV of the Mortgage, inure to the benefit of the respective successors
and assigns of the parties hereto.

                                      -10-
<PAGE>
      Although this Supplemental Indenture is dated as of _________ __, 200_, it
shall be effective only from and after the actual time of its execution and
delivery by the Company and the Trustees on the date indicated by their
respective acknowledgments hereto annexed.

      This Supplemental Indenture may be simultaneously executed in any number
of counterparts, and all such counterparts executed and delivered, each as an
original, shall constitute but one and the same instrument.

                                      -11-
<PAGE>
            IN WITNESS WHEREOF, Commonwealth Edison Company has caused this
Supplemental Indenture to be executed in its name by its __________, and
attested by one of its __________, and BNY Midwest Trust Company, as Trustee
under the Mortgage, has caused this Supplemental Indenture to be executed in its
name by one of its __________, and attested by one of its __________, and D. G.
Donovan, as Co-Trustee under the Mortgage, has hereunto affixed his signature,
all as of the day and year first above written.

                                          COMMONWEALTH EDISON COMPANY

                                          By
                                               Name:
                                               Title:

ATTEST:

            Name:
      Title:

                                          BNY MIDWEST TRUST COMPANY

                                          By
                                                Name:
                                                Title:

ATTEST:

      Name:
      Title:

                                          D. G. DONOVAN

                                      -12-
<PAGE>
STATE OF ILLINOIS )
                        ) SS.
COUNTY OF COOK    )

      I, ____________, a Notary Public in and for said County, in the State
aforesaid, DO HEREBY CERTIFY that ____________, ____________ of Commonwealth
Edison Company, an Illinois corporation, one of the parties described in and
which executed the foregoing instrument, and ____________, ____________ of said
corporation, who are both personally known to me to be the same persons whose
names are subscribed to the foregoing instrument as such ____________ and
____________, respectively, and who are both personally known to me to be
____________ and ____________, respectively, of said corporation, appeared
before me this day in person and severally acknowledged that they signed,
executed and delivered said instrument as their free and voluntary act as such
____________ and ____________, respectively, of said corporation, and as the
free and voluntary act of said corporation, for the uses and purposes therein
set forth.

      GIVEN under my hand and notarial seal this ____ day of __________, A.D.
200_.

                                          ________________
                                          Notary Public

(NOTARIAL SEAL)

My Commission expires ________ __, 20__.

                                      -13-
<PAGE>
STATE OF ILLINOIS )
                        ) SS.
COUNTY OF COOK    )

      I, ____________, a Notary Public in and for said County, in the State
aforesaid, DO HEREBY CERTIFY that ____________, ____________ of BNY Midwest
Trust Company, an Illinois trust company, one of the parties described in and
which executed the foregoing instrument, and ____________, ____________ of said
trust company, who are both personally known to me to be the same persons whose
names are subscribed to the foregoing instrument as such ____________ and
____________, respectively, and who are both personally known to me to be
____________ and ____________, respectively, of said trust company, appeared
before me this day in person and severally acknowledged that they signed,
executed and delivered said instrument as their free and voluntary act as such
____________ and ____________, respectively, of said trust company, and as the
free and voluntary act of said trust company, for the uses and purposes therein
set forth.

      GIVEN under my hand and notarial seal this ___ day of _______, A.D. 200_.

                                          _______________
                                          Notary Public

(NOTARIAL SEAL)

My Commission expires _________ __, 20__.

                                      -14-
<PAGE>
STATE OF ILLINOIS )
                        ) SS.
COUNTY OF COOK    )

      I, ____________, a Notary Public in and for said County, in the State
aforesaid, DO HEREBY CERTIFY that D. G. DONOVAN, one of the parties described in
and which executed the foregoing instrument, who is personally known to me to be
the same person whose name is subscribed to the foregoing instrument, appeared
before me this day in person and acknowledged that he signed, executed and
delivered said instrument as his free and voluntary act for the uses and
purposes therein set forth.

      GIVEN under my hand and notarial seal this ___ day of ________, A.D. 200_.

                                          ______________
                                          Notary Public

(NOTARIAL SEAL)

My Commission expires __________ __, 20__.

                                      -15-<PAGE>
                                                                     EXHIBIT 4-5

                           COMMONWEALTH EDISON COMPANY

                                       AND

                                 CITIBANK, N.A.

              Trustee Under Indenture Dated as of September 1, 1987

                           as amended and supplemented

                         Form of Supplemental Indenture

                          Dated as of _______ __, 200_

                            Providing for issuance of

                        ____% Notes due _______ __, 20__
<PAGE>
            THIS SUPPLEMENTAL INDENTURE, dated as of the __ day of ______, 200_,
between COMMONWEALTH EDISON COMPANY, a corporation duly organized and validly
existing under the laws of the State of Illinois (hereinafter called the
"Company"), and CITIBANK, N.A., a national banking association incorporated and
existing under the laws of the United States of America (hereinafter called the
"Trustee"), Trustee under the Indenture dated as of September 1, 1987, as
amended and supplemented, between the Company and the Trustee (said Indenture,
as heretofore amended and supplemented, hereinafter called the "Original
Indenture").

                              W I T N E S S E T H:

            WHEREAS, the Original Indenture provides for the issuance from time
to time thereunder, in series, of Notes of the Company to provide funds for its
corporate purposes; and

            WHEREAS, the Company desires, by this Supplemental Indenture, to
create a series of ____% Notes to be issuable under the Original Indenture and
to be known as the Company's _____% Notes due ________ __, 20__ (the "Notes"),
and the terms and provisions thereof to be as hereinafter set forth; and

            WHEREAS, the general forms of the Notes and the Trustee's
certificate of authentication to be borne by the Notes are to be in the
respective forms established pursuant to or set forth in the Original Indenture,
with such insertions, omissions and variations as the Board of Directors of the
Company may determine in accordance with the provisions of this Supplemental
Indenture; and

            WHEREAS, all things necessary to make the Notes, when executed by
the Company and authenticated and delivered by the Trustee and duly issued by
the Company, the valid obligations of the Company, and to make this Supplemental
Indenture a valid agreement of the Company, in accordance with their and its
terms, have been done.

            NOW, THEREFORE, THIS SUPPLEMENTAL INDENTURE WITNESSETH:

            For and in consideration of the premises and the purchase of the
Notes by the Holders thereof, it is mutually covenanted and agreed, for the
equal and proportionate benefit of such Holders, as follows:

            SECTION 1. DEFINED TERMS. All terms used in this Supplemental
Indenture that are defined in the Original Indenture have the meanings assigned
to them in the Original Indenture.

            SECTION 2. DESIGNATION AND TERMS OF THE NOTES. A series of Notes
created by this Supplemental Indenture shall be known and designated as the
"____% Notes due _______ __, 20__" of the Company and shall be limited in
aggregate principal amount to $___________.

            The Stated Maturity of the Notes shall be ______ __, 20__. The Notes
shall bear interest from ________ __, 200_, or from the most recent Interest
Payment Date to which interest on the Notes then Outstanding has been paid or
duly provided for, at the rate of _____%

                                       2
<PAGE>
per annum. Interest shall be payable semi-annually on _______ and _______ of
each year, commencing _______ __, 200_, until the principal amount thereof is
paid or duly provided for.

            Payment of principal of the Notes and, unless otherwise paid as
hereinafter provided, the interest thereon will be made at the office or agency
of the Company in the Borough of Manhattan, City and State of New York,
provided, however, that payment of interest may be made at the option of the
Company by check or draft mailed to the person entitled thereto at his address
appearing in the Note Register.

            The Regular Record Date referred to in Section 1.01 of the Original
Indenture for the payment of the interest on the Notes payable, and punctually
paid or duly provided for, on any Interest Payment Date shall be the first day
(whether or not a Business Day) of the month in which such Interest Payment Date
occurs.

            The Notes may be issued in denominations of $1,000 and any integral
multiple thereof authorized by the Company, such authorization to be
conclusively evidenced by the execution thereof.

            Upon the execution of this Supplemental Indenture, the Notes may be
executed by the Company and delivered to the Trustee for authentication, and the
Trustee shall, upon receipt of the documents specified in Section 2.02 of the
Original Indenture, thereupon authenticate and deliver said Notes to or upon a
Company Order.

            SECTION 3. DEPOSITORY SYSTEM. It is intended that the Notes be
registered so as to participate in the securities depository system (the "DTC
System") with The Depository Trust Company ("DTC"), as set forth herein. The
Notes shall be initially issued in the form of a fully registered note or notes
in the name of Cede & Co., or any successor thereto, as nominee for DTC. The
Company and the Trustee are authorized to execute and deliver such letters to or
agreements with DTC as shall be necessary to effectuate the DTC System,
including the Letter of Representations from the Company and the Trustee to DTC
relating to the Notes (the "Representation Letter"). In the event of any
conflict between the terms of the Representation Letter and the Original
Indenture, the terms of the Original Indenture shall control. DTC may exercise
the rights of a noteholder only in accordance with the terms hereof applicable
to the exercise of such rights.

            With respect to Notes registered in the name of DTC or its nominee,
the Company and the Trustee shall have no responsibility or obligation to any
broker-dealer, bank or other financial institution for which DTC holds such
notes from time to time as securities depository (each such broker-dealer, bank
or other financial institution being referred to herein as a "Depository
Participant") or to any person on behalf of whom such a Depository Participant
holds an interest in such notes (each such person being herein referred to as an
"Indirect Participant"). Without limiting the immediately preceding sentence,
the Company and the Trustee shall have no responsibility or obligation with
respect to (a) the accuracy of the records of DTC, its nominee or any Depository
Participant with respect to any ownership interest in the Notes, (b) the
delivery to any Depository Participant or any Indirect Participant or any other
person, other than a registered owner of a Note, of any notice with respect to
the Notes, (c) the payment to any Depository Participant or Indirect Participant
or any other person, other than

                                       3
<PAGE>
a registered owner of a Note, of any amount with respect to principal of, or
interest on, the Notes, or (d) any consent given by DTC as registered owner. So
long as certificates for the Notes of a particular series are not issued as
provided in Section 2.11(c) or (d) of the Original Indenture, the Company and
the Trustee may treat DTC or any successor securities depository as, and deem
DTC or any successor securities depository to be, the absolute owner of such
Notes for all purposes whatsoever, including without limitation (i) the payment
of principal and interest on such Notes, (ii) giving notice of matters with
respect to such Notes and (iii) registering transfers with respect to such
Notes. While a Note is in the DTC System, no person other than DTC or its
nominee shall receive a certificate with respect to such Note.

            Notwithstanding any other provision of the Original Indenture to the
contrary, so long as any Note is registered in the name of DTC or its nominee,
all payments with respect to principal of and interest on such Note and all
notices with respect to such Note shall be made and given, respectively, in the
manner provided in the Representation Letter.

            SECTION 4. REDEMPTION OF NOTES.

            [Insert redemption provisions, if applicable]

            SECTION 5. [Insert any other applicable provisions]

                              T E S T I M O N I U M

            This Supplemental Indenture may be executed in any number of
counterparts, each of which so executed shall be deemed to be an original, but
all such counterparts shall together constitute but one and the same instrument.

                                       4
<PAGE>
            IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed, and their respective corporate seals to be
hereunto affixed and attested, all as of the day and year first above written.

                                            COMMONWEALTH EDISON COMPANY

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:
ATTEST:

--------------------------
Name:
Title:

(Corporate Seal)

                                            CITIBANK, N.A.

                                            By:
                                                -------------------------------
                                                Name:
                                                Title:

ATTEST:

--------------------------
Name:
Title:

(Corporate Seal)

                                        5

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