Document:

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                                                                  EXECUTION COPY
                                                                     EXHIBIT 4.4

                           COMMONWEALTH EDISON COMPANY

                                  $400,000,000

                 First Mortgage 6.15% Bonds, Series 98 Due 2012

                          REGISTRATION RIGHTS AGREEMENT

                                                              New York, New York
                                                                  March 13, 2002

Salomon Smith Barney Inc.
J.P. Morgan Securities Inc.
   As Representatives of the Initial Purchasers
c/o Salomon Smith Barney Inc.
388 Greenwich Street
New York, New York  10013

Ladies and Gentlemen:

     Commonwealth Edison Company, a corporation organized under the laws of the
State of Illinois (the "Company"), proposes to issue and sell to certain
purchasers (the "Initial Purchasers") the Company's First Mortgage 6.15% Bonds,
Series Due 2012 (the "Securities"), upon the terms set forth in a purchase
agreement dated as of March 6, 2002 (the "Purchase Agreement"), relating to the
initial placement of the Securities (the "Initial Placement"). To induce the
Initial Purchasers to enter into the Purchase Agreement and to satisfy a
condition of your obligations thereunder, the Company agrees with you for your
benefit and the benefit of the holders from time to time of the Securities
(including the Initial Purchasers) (each a "Holder" and, together, the
"Holders"), as follows:

     1.   DEFINITIONS. Each of the capitalized terms used herein without
definition shall have the meaning set forth in the Purchase Agreement. As used
in this Agreement, the following capitalized defined terms shall have the
following meanings:

          "Act" shall mean the Securities Act of 1933, as amended, and the rules
and regulations of the Commission promulgated thereunder.

          "Affiliate" of any specified Person shall mean any other Person that,
directly or indirectly, is in control of, is controlled by, or is under common
control with, such specified Person. For purposes of this definition, control of
a Person shall mean the power, direct or indirect, to direct or cause the
direction of the management and policies of such Person whether by contract or
otherwise; and the terms "controlling" and "controlled" shall have meanings
correlative to the foregoing.

          "Broker-Dealer" shall mean any broker or dealer registered as such
under the Exchange Act.

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          "Business Day" shall mean any day other than a Saturday, a Sunday or a
legal holiday or a day on which banking institutions or trust companies are
authorized or obligated by law to close in New York City.

          "Commission" shall mean the Securities and Exchange Commission.

          "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended, and the rules and regulations of the Commission promulgated thereunder.

          "Exchange Offer Registration Period" shall mean the one-year period
following the consummation of the Registered Exchange Offer, exclusive of any
period during which any stop order shall be in effect suspending the
effectiveness of the Exchange Offer Registration Statement.

          "Exchange Offer Registration Statement" shall mean a registration
statement of the Company on an appropriate form under the Act with respect to
the Registered Exchange Offer, all amendments and supplements to such
registration statement, including post-effective amendments thereto, in each
case including the Prospectus contained therein, all exhibits thereto and all
material incorporated by reference therein.

          "Exchanging Dealer" shall mean any Holder (which may include any
Initial Purchaser) that is a Broker-Dealer and elects to exchange for New
Securities any Securities that it acquired for its own account as a result of
market-making activities or other trading activities (but not directly from the
Company or any Affiliate of the Company) for New Securities.

          "Final Memorandum" shall have the meaning set forth in the Purchase
Agreement.

          "Holder" shall have the meaning set forth in the preamble hereto.

          "Initial Placement" shall have the meaning set forth in the preamble
hereto.

          "Initial Purchaser" shall have the meaning set forth in the preamble
hereto.

          "Losses" shall have the meaning set forth in Section 6(d) hereof.

          "Majority Holders" shall mean the Holders of a majority of the
aggregate principal amount of Securities registered under a Registration
Statement.

          "Managing Underwriters" shall mean the investment banker or investment
bankers and manager or managers that shall administer an underwritten offering
of the Securities offered pursuant to a Shelf Registration Statement.

          "Mortgage" shall mean the Company's Mortgage relating to the
Securities, dated as of July 1, 1923, as amended and supplemented through the
date hereof, including by the Supplemental Indenture dated as of March 1, 2002
from the Company to BNY Midwest Trust Company, as trustee, and D.G. Donovan, as
co-trustee, as the same may be further amended from time to time in accordance
with the terms thereof.

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          "New Securities" shall mean debt securities of the Company identical
in all material respects to the Securities (except that the interest rate
step-up provisions and the transfer restrictions shall be modified or
eliminated, as appropriate) and to be issued under the Mortgage.

          "Prospectus" shall mean the prospectus included in any Registration
Statement (including, without limitation, a prospectus that discloses
information previously omitted from a prospectus filed as part of an effective
registration statement in reliance upon Rule 430A under the Act), as amended or
supplemented by any prospectus supplement, with respect to the terms of the
offering of any portion of the Securities or the New Securities covered by such
Registration Statement, and all amendments and supplements thereto and all
material incorporated by reference therein.

          "Purchase Agreement" shall have the meaning set forth in the preamble
hereto.

          "Registered Exchange Offer" shall mean the proposed offer of the
Company to issue and deliver to the Holders of the Securities that are not
prohibited by any law or policy of the Commission from participating in such
offer, in exchange for the Securities, a like aggregate principal amount of the
New Securities.

          "Registration Statement" shall mean any Exchange Offer Registration
Statement or Shelf Registration Statement that covers any of the Securities or
the New Securities pursuant to the provisions of this Agreement, any amendments
and supplements to such registration statement, including post-effective
amendments (in each case including the Prospectus contained therein), all
exhibits thereto and all material incorporated by reference therein.

          "Securities" shall have the meaning set forth in the preamble hereto.

          "Shelf Registration" shall mean a registration effected pursuant to
Section 3 hereof.

          "Shelf Registration Period" has the meaning set forth in Section 3(b)
hereof.

          "Shelf Registration Statement" shall mean a "shelf" registration
statement of the Company pursuant to the provisions of Section 3 hereof which
covers some or all of the Securities or New Securities, as applicable, on an
appropriate form under Rule 415 under the Act, or any similar rule that may be
adopted by the Commission, amendments and supplements to such registration
statement, including post-effective amendments, in each case including the
Prospectus contained therein, all exhibits thereto and all material incorporated
by reference therein.

          "Trustee" shall mean the corporate trustee with respect to the
Securities under the Mortgage.

          "Underwriter" shall mean any underwriter of Securities in connection
with an offering thereof under a Shelf Registration Statement.

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     2.   REGISTERED EXCHANGE OFFER.

          (a)  To the extent not prohibited by any applicable law or applicable
interpretation of the Staff of the Commission, the Company shall use its best
efforts to consummate the Registered Exchange Offer within 270 days of the date
of the original issuance of the Securities (or if such 270th day is not a
Business Day, the next succeeding Business Day).

          (b)  Upon the effectiveness of the Exchange Offer Registration
Statement, the Company shall promptly commence the Registered Exchange Offer, it
being the objective of such Registered Exchange Offer to enable each Holder
electing to exchange Securities for New Securities (assuming that such Holder is
not an Affiliate of the Company, acquires the New Securities in the ordinary
course of such Holder's business, has no arrangements with any Person to
participate in the distribution of the New Securities and is not prohibited by
any law or policy of the Commission from participating in the Registered
Exchange Offer) to trade such New Securities from and after their receipt
without any limitations or restrictions under the Act and without material
restrictions under the securities laws of a substantial proportion of the
several states of the United States.

          (c)  In connection with the Registered Exchange Offer, the Company
shall:

               (i)    mail to each Holder a copy of the Prospectus forming part
          of the Exchange Offer Registration Statement, together with an
          appropriate letter of transmittal and related documents;

               (ii)   keep the Registered Exchange Offer open for not less than
          20 Business Days and not more than 30 Business Days after the date
          notice thereof is mailed to the Holders (or, in each case, longer if
          required by applicable law);

               (iii)  use its best efforts to keep the Exchange Offer
          Registration Statement continuously effective under the Act,
          supplemented and amended as required, under the Act to ensure that it
          is available for sales of New Securities by Exchanging Dealers during
          the Exchange Offer Registration Period;

               (iv)   utilize the services of a depositary for the Registered
          Exchange Offer with an address in the Borough of Manhattan in New York
          City, which may be the Trustee or an Affiliate of the Trustee;

               (v)    permit Holders to withdraw tendered Securities at any time
          prior to the close of business, New York time, on the last Business
          Day on which the Registered Exchange Offer is open;

               (vi)   prior to effectiveness of the Exchange Offer Registration
          Statement, provide a supplemental letter to the Commission (A) stating
          that the Company is conducting the Registered Exchange Offer in
          reliance on the position of the Commission in EXXON CAPITAL HOLDINGS
          CORPORATION (pub. avail. May 13, 1988), and MORGAN STANLEY AND CO.,
          INC. (pub. avail. June 5, 1991); and (B) including a representation
          that the Company has not entered into any arrangement or understanding
          with any Person to distribute the New Securities to be received

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          in the Registered Exchange Offer and that, to the best of the
          Company's information and belief, each Holder participating in the
          Registered Exchange Offer is acquiring the New Securities in the
          ordinary course of business and has no arrangement or understanding
          with any Person to participate in the distribution of the New
          Securities; and

               (vii)  comply in all respects with all applicable laws.

          (d)  As soon as practicable after the close of the Registered Exchange
Offer, the Company shall:

               (i)    accept for exchange all Securities tendered and not
          validly withdrawn pursuant to the Registered Exchange Offer;

               (ii)   deliver to the Trustee for cancellation in accordance with
          Section 4(s) all Securities so accepted for exchange; and

               (iii)  cause the Trustee promptly to authenticate and deliver to
          each Holder of Securities a principal amount of New Securities equal
          to the principal amount of the Securities of such Holder so accepted
          for exchange.

          (e)  Each Holder hereby acknowledges and agrees that any Broker-Dealer
and any such Holder using the Registered Exchange Offer to participate in a
distribution of the New Securities (x) could not under Commission policy as in
effect on the date of this Agreement rely on the position of the Commission in
MORGAN STANLEY AND CO., INC. (pub. avail. June 5, 1991) and EXXON CAPITAL
HOLDINGS CORPORATION (pub. avail. May 13, 1988), as interpreted in the
Commission's letter to SHEARMAN & STERLING dated July 2, 1993 and similar
no-action letters; (y) must comply with the registration and prospectus delivery
requirements of the Act in connection with any secondary resale transaction; and
(z) must be covered by an effective registration statement containing the
selling security holder information required by Item 507 or 508, as applicable,
of Regulation S-K under the Act if the resales are of New Securities obtained by
such Holder in exchange for Securities acquired by such Holder directly from the
Company or one of its Affiliates. Accordingly, each Holder participating in the
Registered Exchange Offer shall be required to represent to the Company that, at
the time of the consummation of the Registered Exchange Offer:

               (i)    any New Securities received by such Holder will be
          acquired in the ordinary course of business;

               (ii)   such Holder will have no arrangement or understanding with
          any Person to participate in the distribution of the Securities or the
          New Securities within the meaning of the Act; and

               (iii)  such Holder is not an Affiliate of the Company.

          (f)  If any Initial Purchaser determines that it is not eligible to
participate in the Registered Exchange Offer with respect to the exchange of
Securities constituting any portion of an unsold allotment, at the request of
such Initial Purchaser, the Company shall issue

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and deliver to such Initial Purchaser or the Person purchasing New Securities
registered under a Shelf Registration Statement as contemplated by Section 3
hereof from such Initial Purchaser, in exchange for such Securities, a like
principal amount of New Securities. The Company shall use its best efforts to
cause the CUSIP Service Bureau to issue the same CUSIP number for such New
Securities as for New Securities issued pursuant to the Registered Exchange
Offer.

     3.   SHELF REGISTRATION.

          (a)  If (i) due to any change in law or applicable interpretations
thereof by the Commission's staff, the Company determines upon advice of its
outside counsel that it is not permitted to effect the Registered Exchange Offer
as contemplated by Section 2 hereof;

               (ii)   for any other reason the Registered Exchange Offer is not
          consummated within 270 days of the date hereof;

               (iii)  any Initial Purchaser so requests with respect to
          Securities that are not eligible to be exchanged for New Securities in
          the Registered Exchange Offer and that are held by it following
          consummation of the Registered Exchange Offer;

               (iv)   any Holder (other than an Initial Purchaser) is not
          eligible to participate in the Registered Exchange Offer; or

               (v)    in the case of any Initial Purchaser that participates in
          the Registered Exchange Offer or acquires New Securities pursuant to
          Section 2(f) hereof, such Initial Purchaser does not receive freely
          tradeable New Securities in exchange for Securities constituting any
          portion of an unsold allotment (it being understood that (x) the
          requirement that an Initial Purchaser deliver a Prospectus containing
          the information required by Item 507 or 508 of Regulation S-K under
          the Act in connection with sales of New Securities acquired in
          exchange for such Securities shall result in such New Securities being
          not "freely tradeable"; and (y) the requirement that an Exchanging
          Dealer deliver a Prospectus in connection with sales of New Securities
          acquired in the Registered Exchange Offer in exchange for Securities
          acquired as a result of market-making activities or other trading
          activities shall not result in such New Securities being not "freely
          tradeable"), the Company shall effect a Shelf Registration Statement
          in accordance with subsection (b) below.

          (b)  (i) To the extent not prohibited by any applicable law or
applicable interpretation of the Staff of the Commission, the Company shall as
promptly as practicable (but in no event more than 60 days after so required or
requested pursuant to this Section 3), file with the Commission and thereafter
shall use its best efforts to cause to be declared effective under the Act a
Shelf Registration Statement relating to the offer and sale of the Securities or
the New Securities, as applicable, by the Holders thereof from time to time in
accordance with the methods of distribution elected by such Holders and set
forth in such Shelf Registration Statement; PROVIDED, HOWEVER, that no Holder
(other than an Initial Purchaser) shall be entitled to have the Securities held
by it covered by such Shelf Registration Statement unless such Holder agrees in
writing to be bound by all of the provisions of this Agreement applicable to
such

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Holder; and provided further, that with respect to New Securities received
by an Initial Purchaser in exchange for Securities constituting any portion of
an unsold allotment, the Company may, if permitted by current interpretations by
the Commission's staff, file a post-effective amendment to the Exchange Offer
Registration Statement containing the information required by Item 507 or 508 of
Regulation S-K, as applicable, in satisfaction of its obligations under this
subsection with respect thereto, and any such Exchange Offer Registration
Statement, as so amended, shall be referred to herein as, and governed by the
provisions herein applicable to, a Shelf Registration Statement.

               (ii)   The Company shall use its best efforts to keep the Shelf
          Registration Statement continuously effective, supplemented and
          amended as required by the Act, in order to permit the Prospectus
          forming part thereof to be usable by Holders for a period of two years
          from the date the Shelf Registration Statement is declared effective
          by the Commission or such shorter period that will terminate when all
          the Securities or New Securities, as applicable, covered by the Shelf
          Registration Statement have been sold pursuant to the Shelf
          Registration Statement (in any such case, such period being called the
          "Shelf Registration Period"). The Company shall be deemed not to have
          used its best efforts to keep the Shelf Registration Statement
          effective during the requisite period if it voluntarily takes any
          action that would result in Holders of Securities covered thereby not
          being able to offer and sell such Securities during that period,
          unless (A) such action is required by applicable law; or (B) such
          action is taken by the Company in good faith and for valid business
          reasons (not including avoidance of the Company's obligations
          hereunder), including the acquisition or divestiture of assets,
          business combinations or similar significant corporate transactions
          involving the Company or Exelon Corporation so long as the Company
          promptly thereafter complies with the requirements of Section 4(j)
          hereof, if applicable.

     4.   ADDITIONAL REGISTRATION PROCEDURES. In connection with any Shelf
Registration Statement and, to the extent applicable, any Exchange Offer
Registration Statement, the following provisions shall apply.

          (a)  The Company shall:

               (i)    furnish to you, not less than five Business Days prior to
          the filing thereof with the Commission, a copy of any Exchange Offer
          Registration Statement and any Shelf Registration Statement, and each
          amendment thereof and each amendment or supplement, if any, to the
          Prospectus included therein (including all documents incorporated by
          reference therein after the initial filing) and shall use its best
          efforts to reflect in each such document, when so filed with the
          Commission, such comments as you reasonably propose;

               (ii)   include the information set forth in Annex A hereto on the
          facing page of the Exchange Offer Registration Statement, in Annex B
          hereto in the forepart of the Exchange Offer Registration Statement in
          a section setting forth details of the Exchange Offer, in Annex C
          hereto in the underwriting or plan of distribution section of the
          Prospectus contained in the Exchange Offer

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          Registration Statement, and in Annex D hereto in the letter of
          transmittal delivered pursuant to the Registered Exchange Offer;

               (iii)  if requested by an Initial Purchaser, include the
          information required by Item 507 or 508 of Regulation S-K, as
          applicable, in the Prospectus contained in the Exchange Offer
          Registration Statement or Shelf Registration Statement; and

               (iv)   in the case of a Shelf Registration Statement, include the
          names of the Holders that propose to sell Securities pursuant to the
          Shelf Registration Statement as selling security holders.

          (b)  The Company shall advise you, the Holders of Securities covered
by any Shelf Registration Statement and any Exchanging Dealer under any Exchange
Offer Registration Statement that has provided in writing to the Company a
telephone or facsimile number and address for notices, and, if requested by you
or any such Holder or Exchanging Dealer, shall confirm such advice in writing
(which notice pursuant to clauses (ii)-(v) hereof shall be accompanied by an
instruction to suspend the use of the Prospectus until the Company shall have
remedied the basis for such suspension):

               (i)    when a Registration Statement and any amendment thereto
          has been filed with the Commission and when the Registration Statement
          or any post-effective amendment thereto has become effective;

               (ii)   of any request by the Commission for any amendment or
          supplement to the Registration Statement or the Prospectus or for
          additional information;

               (iii)  of the issuance by the Commission of any stop order
          suspending the effectiveness of the Registration Statement or the
          initiation of any proceedings for that purpose;

               (iv)   of the receipt by the Company of any notification with
          respect to the suspension of the qualification of the securities
          included therein for sale in any jurisdiction or the initiation of any
          proceeding for such purpose; and

               (v)    of the happening of any event that requires any change in
          the Registration Statement or the Prospectus so that, as of such date,
          the statements therein are not misleading and do not omit to state a
          material fact required to be stated therein or necessary to make the
          statements therein (in the case of the Prospectus, in the light of the
          circumstances under which they were made) not misleading.

          (c)  The Company shall use its best efforts to obtain the withdrawal
of any order suspending the effectiveness of any Registration Statement or the
qualification of the securities therein for sale in any jurisdiction at the
earliest possible time.

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          (d)  The Company shall furnish to each Holder of Securities covered by
any Shelf Registration Statement, without charge, at least one copy of such
Shelf Registration Statement and any post-effective amendment thereto, including
all material incorporated therein by reference, and, if the Holder so requests
in writing, all exhibits thereto (including exhibits incorporated by reference
therein).

          (e)  The Company shall, during the Shelf Registration Period, deliver
to each Holder of Securities covered by any Shelf Registration Statement,
without charge, as many copies of the Prospectus (including each preliminary
Prospectus) included in such Shelf Registration Statement and any amendment or
supplement thereto as such Holder may reasonably request. The Company consents
to the use of the Prospectus or any amendment or supplement thereto by each of
the selling Holders of Securities in connection with the offering and sale of
the Securities covered by the Prospectus, or any amendment or supplement
thereto, included in the Shelf Registration Statement.

          (f)  The Company shall furnish to each Exchanging Dealer which so
requests, without charge, at least one copy of the Exchange Offer Registration
Statement and any post-effective amendment thereto, including all material
incorporated by reference therein, and, if the Exchanging Dealer so requests in
writing, all exhibits thereto (including exhibits incorporated by reference
therein).

          (g)  The Company shall promptly deliver to each Initial Purchaser,
each Exchanging Dealer and each other Person required to deliver a Prospectus
during the Exchange Offer Registration Period, without charge, as many copies of
the Prospectus included in such Exchange Offer Registration Statement and any
amendment or supplement thereto as any such Person may reasonably request. The
Company consents to the use of the Prospectus or any amendment or supplement
thereto by any Initial Purchaser, any Exchanging Dealer and any such other
Person that may be required to deliver a Prospectus following the Registered
Exchange Offer in connection with the offering and sale of the New Securities
covered by the Prospectus, or any amendment or supplement thereto, included in
the Exchange Offer Registration Statement.

          (h)  Prior to the Registered Exchange Offer or any other offering of
Securities pursuant to any Registration Statement, the Company shall arrange, if
necessary, for the qualification of the Securities or the New Securities for
sale under the laws of such jurisdictions as any Holder shall reasonably request
and will maintain such qualification in effect so long as required; provided
that in no event shall the Company be obligated to qualify to do business in any
jurisdiction where it is not then so qualified or to take any action that would
subject it to service of process in suits, other than those arising out of the
Initial Placement, the Registered Exchange Offer or any offering pursuant to a
Shelf Registration Statement, in any such jurisdiction where it is not then so
subject.

          (i)  The Company shall cooperate with the Holders of Securities to
facilitate the timely preparation and delivery of certificates representing New
Securities or Securities to be issued or sold pursuant to any Registration
Statement free of any restrictive legends and in such denominations and
registered in such names as Holders may request.

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          (j)  Upon the occurrence of any event contemplated by subsections
(b)(ii) through (v) above, the Company shall promptly prepare a post-effective
amendment to the applicable Registration Statement or an amendment or supplement
to the related Prospectus or file any other required document so that, as
thereafter delivered to Initial Purchasers of the Securities included therein,
the Prospectus will not include an untrue statement of a material fact or omit
to state any material fact necessary to make the statements therein, in the
light of the circumstances under which they were made, not misleading. In such
circumstances, the period of effectiveness of the Exchange Offer Registration
Statement provided for in Section 2 and the Shelf Registration Statement
provided for in Section 3(b) shall each be extended by the number of days from
and including the date of the giving of a notice of suspension pursuant to
Section 4(b) to and including the date when the Initial Purchasers, the Holders
of the Securities and any known Exchanging Dealer shall have received such
amended or supplemented Prospectus pursuant to this Section.

          (k)  Not later than the effective date of any Registration Statement,
the Company shall provide a CUSIP number for the Securities or the New
Securities, as the case may be, registered under such Registration Statement and
provide the Trustee with certificates for such Securities or New Securities, in
a form eligible for deposit with The Depository Trust Company.

          (l)  The Company shall make generally available to its security
holders as soon as practicable after the effective date of the applicable
Registration Statement an earnings statement satisfying the provisions of
Section 11(a) of the Act.

          (m)  The Company shall cause the Mortgage to be qualified under the
Trust Indenture Act in a timely manner.

          (n)  The Company may require each Holder of Securities to be sold
pursuant to any Shelf Registration Statement to furnish to the Company such
information regarding the Holder and the distribution of such Securities as the
Company may from time to time reasonably require for inclusion in such
Registration Statement. The Company may exclude from such Shelf Registration
Statement the Securities of any Holder that unreasonably fails to furnish such
information within a reasonable time after receiving such request and the
Company shall be under no further obligations to such Holder to include such
Holder in a Shelf Registration Statement.

          (o)  In the case of any Shelf Registration Statement, the Company
shall enter into such and take all other appropriate actions (including if
requested an underwriting agreement in customary form) in order to expedite or
facilitate the registration or the disposition of the Securities, and in
connection therewith, if an underwriting agreement is entered into, cause the
same to contain indemnification provisions and procedures no less favorable than
those set forth in Section 6 (or such other provisions and procedures acceptable
to the Majority Holders and the Managing Underwriters, if any, with respect to
all parties to be indemnified pursuant to Section 6.

          (p)  In the case of any Shelf Registration Statement, the Company
shall:

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               (i)    subject to execution of a confidentiality agreement in
          form and substance reasonably acceptable to the Company and the
          Holders, make reasonably available for inspection by the Holders of
          Securities to be registered thereunder, any underwriter participating
          in any disposition pursuant to such Registration Statement, and any
          attorney, accountant or other agent retained by the Holders or any
          such underwriter all relevant financial and other records, pertinent
          corporate documents and properties of the Company and its
          subsidiaries;

               (ii)   cause the Company's officers, directors and employees to
          supply all relevant information reasonably requested by the Holders or
          any such underwriter, attorney, accountant or agent in connection with
          any such Registration Statement as is customary for similar due
          diligence examinations; provided, however, that any information that
          is designated in writing by the Company, in good faith, as
          confidential at the time of delivery of such information shall be kept
          confidential by the Holders or any such underwriter, attorney,
          accountant or agent, unless such disclosure is made in connection with
          a court proceeding or required by law, or such information becomes
          available to the public generally or through a third party without an
          accompanying obligation of confidentiality;

               (iii)  make such representations and warranties to the Holders of
          Securities registered thereunder and the underwriters, if any, in
          form, substance and scope as are customarily made by issuers to
          underwriters in underwritten offerings and covering those matters set
          forth in the Purchase Agreement;

               (iv)   obtain opinions of counsel to the Company and updates
          thereof (which counsel and opinions (in form, scope and substance)
          shall be reasonably satisfactory to the Managing Underwriters, if any)
          addressed to each selling Holder and the underwriters, if any,
          covering the matters covered in the opinion delivered under the
          Purchase Agreement and matters related to registration of the
          Securities under the Act and the qualification of the Mortgage under
          the Trust Indenture Act of 1940, as amended;

               (v)    obtain "cold comfort" letters and updates thereof from the
          independent certified public accountants of the Company (and, if
          necessary, any other independent certified public accountants of any
          subsidiary of the Company or of any business acquired by the Company
          for which financial statements and financial data are, or are required
          to be, included in the Registration Statement), addressed to each
          selling Holder of Securities registered thereunder and the
          underwriters, if any, in customary form and covering matters of the
          type customarily covered in "cold comfort" letters in connection with
          primary underwritten offerings; and

               (vi)   deliver such documents and certificates as may be
          reasonably requested by the Majority Holders and the Managing
          Underwriters, if any, including those to evidence compliance with
          Section 4(k) and with any customary

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          conditions contained in the underwriting agreement or other agreement
          entered into by the Company.

     The actions set forth in clauses (iii), (iv), (v) and (vi) of this Section
shall be performed at each closing under any underwriting or similar agreement
as and to the extent required thereunder.

          (q)  If a Registered Exchange Offer is to be consummated, upon
delivery of the Securities by Holders to the Company (or to such other Person as
directed by the Company) in exchange for the New Securities, the Company shall
mark, or caused to be marked, on the Securities so exchanged that such
Securities are being canceled in exchange for the New Securities. In no event
shall the Securities be marked as paid or otherwise satisfied.

          (r)  The Company will use its best efforts (i) if the Securities have
been rated prior to the initial sale of such Securities pursuant to the Purchase
Agreement, to confirm such ratings will apply to the Securities or the New
Securities, as the case may be, covered by a Registration Statement; or (ii) if
the Securities were not previously rated, to cause the Securities covered by a
Registration Statement to be rated with at least one nationally recognized
statistical rating agency, if so requested by Majority Holders with respect to
the related Registration Statement or by any Managing Underwriters.

          (s)  In the event that any Broker-Dealer shall underwrite any
Securities or participate as a member of an underwriting syndicate or selling
group or "assist in the distribution" (within the meaning of the Rules of Fair
Practice and the By-Laws of the National Association of Securities Dealers,
Inc.) thereof, whether as a Holder of such Securities or as an underwriter, a
placement or sales agent or a broker or dealer in respect thereof, or otherwise,
assist such Broker-Dealer in complying with the requirements of such Rules and
By-Laws, including, without limitation, by:

               (i)    if such Rules or By-Laws shall so require, engaging a
          "qualified independent underwriter" (as defined in such Rules) to
          participate in the preparation of the Registration Statement, to
          exercise usual standards of due diligence with respect thereto and, if
          any portion of the offering contemplated by such Registration
          Statement is an underwritten offering or is made through a placement
          or sales agent, to recommend the yield of such Securities;

               (ii)   indemnifying any such qualified independent underwriter to
          the extent of the indemnification of underwriters provided in Section
          6 hereof; and

               (iii)  providing such information to such Broker-Dealer as may be
          required in order for such Broker-Dealer to comply with the
          requirements of such Rules.

          (t)  The Company shall use its best efforts to take all other steps
necessary to effect the registration of the Securities or the New Securities, as
the case may be, covered by a Registration Statement.

                                      -12-
<Page>

     5.   REGISTRATION EXPENSES. The Company shall bear all expenses incurred in
connection with the performance of its obligations under Sections 2, 3 and 4
hereof and, in the event of any Shelf Registration Statement, will reimburse the
Holders for the reasonable fees and disbursements of one firm or counsel
designated by the Majority Holders to act as counsel for the Holders in
connection therewith, and, in the case of any Exchange Offer Registration
Statement, will reimburse the Initial Purchasers for the reasonable fees and
disbursements of their counsel incurred in connection with their review of the
Exchange Offer Registration Statement.

     6.   INDEMNIFICATION AND CONTRIBUTION.

          (a)  The Company agrees to indemnify and hold harmless each Holder of
Securities or New Securities, as the case may be, covered by any Registration
Statement (including each Initial Purchaser and, with respect to any Prospectus
delivery as contemplated in Section 4(h) hereof, each Exchanging Dealer), the
directors, officers, employees and agents of each such Holder and each Person
who controls any such Holder within the meaning of either the Act or the
Exchange Act against any and all losses, claims, damages or liabilities, joint
or several, to which they or any of them may become subject under the Act, the
Exchange Act or other Federal or state statutory law or regulation, at common
law or otherwise, insofar as such losses, claims, damages or liabilities (or
actions in respect thereof) arise out of or are based upon any untrue statement
or alleged untrue statement of a material fact contained in the Registration
Statement as originally filed or in any amendment thereof, or in any preliminary
Prospectus or the Prospectus, or in any amendment thereof or supplement thereto,
or arise out of or are based upon the omission or alleged omission to state
therein a material fact required to be stated therein or necessary to make the
statements therein not misleading, and agrees to reimburse each such indemnified
party, as incurred, for any legal or other expenses reasonably incurred by them
in connection with investigating or defending any such loss, claim, damage,
liability or action; provided, however, that the Company will not be liable in
any case to the extent that any such loss, claim, damage or liability arises out
of or is based upon any such untrue statement or alleged untrue statement or
omission or alleged omission made therein in reliance upon and in conformity
with written information furnished to the Company by or on behalf of any such
Holder specifically for inclusion therein; provided, further, that such
indemnity with respect to any untrue statement contained in or omission from the
preliminary Prospectus shall not inure to the benefit of any Holder (or any
person controlling such holder) from whom the person asserting such loss, claim,
damage or liability purchased any of the Securities or New Securities which are
the subject thereof if such person did not receive a copy of the Prospectus (or,
if the Prospectus shall have been amended or supplemented, the Prospectus as
then amended or supplemented), excluding incorporated documents, at or prior to
the confirmation of sale of such securities or New Securities to such person in
any case where such delivery is required by the Act and the untrue statement or
omission of a material fact contained in such preliminary Prospectus was
corrected in the Prospectus as then amended or supplemented), and it is finally
judicially determined that such delivery was required to be made under the Act
and was no so made. This indemnity agreement will be in addition to any
liability which the Company may otherwise have.

     The Company also agrees to indemnify or contribute as provided in Section
6(d) to Losses of each and any person deemed an "underwriter", under the Act or
the rules and regulations thereunder, of Securities or New Securities, as the
case may be, registered under a

                                      -13-
<Page>

Shelf Registration Statement, their directors, officers, employees or agents and
each Person who controls such underwriter on substantially the same basis as
that of the indemnification of the Initial Purchasers and the selling Holders
provided in this Section 6(a) and shall, if requested by any Holder, enter into
an underwriting agreement reflecting such agreement, as provided in Section 4(p)
hereof.

          (b)  Each Holder of securities covered by a Registration Statement
(including each Initial Purchaser and, with respect to any Prospectus delivery
as contemplated in Section 4(h) hereof, each Exchanging Dealer) severally agrees
to indemnify and hold harmless the Company each of its directors each of its
officers who signs such Registration Statement and each Person who controls the
Company within the meaning of either the Act or the Exchange Act, to the same
extent as the foregoing indemnity from the Company to each such Holder, but only
with reference to written information relating to such Holder furnished to the
Company by or on behalf of such Holder specifically for inclusion in the
documents referred to in the foregoing indemnity. This indemnity agreement will
be in addition to any liability which any such Holder may otherwise have.

          (c)  Promptly after receipt by an indemnified party under this Section
6 of notice of the commencement of any action, such indemnified party will, if a
claim in respect thereof is to be made against the indemnifying party under this
Section, notify the indemnifying party in writing of the commencement thereof;
but the failure so to notify the indemnifying party (i) will not relieve it from
liability under paragraph (a) or (b) above unless and to the extent it did not
otherwise learn of such action and such failure results in the forfeiture by the
indemnifying party of substantial rights and defenses; and (ii) will not, in any
event, relieve the indemnifying party from any obligations to any indemnified
party other than the indemnification obligation provided in paragraph (a) or (b)
above. The indemnifying party shall be entitled to appoint counsel of the
indemnifying party's choice at the indemnifying party's expense to represent the
indemnified party in any action for which indemnification is sought (in which
case the indemnifying party shall not thereafter be responsible for the fees and
expenses of any separate counsel retained by the indemnified party or parties
except as set forth below); provided, however, that such counsel shall be
satisfactory to the indemnified party. Notwithstanding the indemnifying party's
election to appoint counsel to represent the indemnified party in an action, the
indemnified party shall have the right to employ separate counsel, and the
indemnifying party shall bear the reasonable fees, costs and expenses of such
separate counsel if (i) the use of counsel chosen by the indemnifying party to
represent the indemnified party would present such counsel with a conflict of
interest; (ii) the actual or potential defendants in, or targets of, any such
action include both the indemnified party and the indemnifying party and the
indemnified party shall have reasonably concluded that there may be legal
defenses available to it and/or other indemnified parties which are different
from or additional to those available to the indemnifying party; (iii) the
indemnifying party shall not have employed counsel satisfactory to the
indemnified party to represent the indemnified party within a reasonable time
after notice of the institution of such action; or (iv) the indemnifying party
shall authorize the indemnified party to employ separate counsel at the expense
of the indemnifying party; provided, however, that the indemnifying party shall
not be responsible for the fees and expenses of more than one separate firm
representing indemnified parties described in clauses (i) or (ii) of this
sentence. An indemnifying party will not, without the prior written consent of
the indemnified parties, settle or compromise or consent to the entry of any
judgment with respect to any pending or threatened

                                      -14-
<Page>

claim, action, suit or proceeding in respect of which indemnification or
contribution may be sought hereunder (whether or not the indemnified parties are
actual or potential parties to such claim or action) unless such settlement,
compromise or consent includes an unconditional release of each indemnified
party from all liability arising out of such claim, action, suit or proceeding.

          (d)  In the event that the indemnity provided in paragraph (a) or (b)
of this Section is for any reason held to be unenforceable by an indemnified
party although applicable in accordance with its terms, then each applicable
indemnifying party shall have a several and not joint obligation to contribute
to the aggregate losses, claims, damages and liabilities (including legal or
other expenses reasonably incurred in connection with investigating or defending
same) (collectively "Losses") to which such indemnified party may be subject in
such proportion as is appropriate to reflect the relative benefits received by
such indemnifying party, on the one hand, and such indemnified party, on the
other hand, from the Initial Placement and the Registration Statement which
resulted in such Losses; provided, however, that in no case shall any Initial
Purchaser or any subsequent Holder of any Security or New Security be
responsible, in the aggregate, for any amount in excess of the purchase discount
or commission applicable to such Security, or in the case of a New Security,
applicable to the Security that was exchangeable into such New Security, as set
forth on the cover page of the Final Memorandum, nor shall any underwriter be
responsible for any amount in excess of the underwriting discount or commission
applicable to the securities purchased by such underwriter under the
Registration Statement which resulted in such Losses. If the allocation provided
by the immediately preceding sentence is unavailable for any reason, the
indemnifying party and the indemnified party shall contribute in such proportion
as is appropriate to reflect not only such relative benefits but also the
relative fault of such indemnifying party, on the one hand, and such indemnified
party, on the other hand, in connection with the statements or omissions which
resulted in such Losses as well as any other relevant equitable considerations.
Benefits received by the Company shall be deemed to be equal to the sum of (x)
the total net proceeds from the Initial Placement (before deducting expenses) as
set forth on the cover page of the Final Memorandum and (y) the total amount of
additional interest which the Company was not required to pay as a result of
registering the securities covered by the Registration Statement which resulted
in such Losses. Benefits received by the Initial Purchasers shall be deemed to
be equal to the total purchase discounts and commissions as set forth on the
cover page of the Final Memorandum, and benefits received by any other Holders
shall be deemed to be equal to the value of receiving Securities or New
Securities, as applicable, registered under the Act. Benefits received by any
underwriter shall be deemed to be equal to the total underwriting discounts and
commissions, as set forth on the cover page of the Prospectus forming a part of
the Registration Statement which resulted in such Losses. Relative fault shall
be determined by reference to, among other things, whether any alleged untrue
statement or omission relates to information provided by the indemnifying party,
on the one hand, or by the indemnified party, on the other hand, the intent of
the parties and their relative knowledge, access to information and opportunity
to correct or prevent such untrue statement or omission. The parties agree that
it would not be just and equitable if contribution were determined by pro rata
allocation (even if the Holders were treated as one entity for such purpose) or
any other method of allocation which does not take account of the equitable
considerations referred to above. Notwithstanding the provisions of this
paragraph (d), no Person guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the Act) shall be entitled to contribution from any
Person who was not guilty of such fraudulent misrepresentation. For purposes of
this Section, each Person who controls a Holder within the

                                      -15-
<Page>

meaning of either the Act or the Exchange Act and each director, officer,
employee and agent of such Holder shall have the same rights to contribution as
such Holder, and each Person who controls the Company within the meaning of
either the Act or the Exchange Act, each officer of the Company who shall have
signed the Registration Statement and each director of the Company shall have
the same rights to contribution as the Company, subject in each case to the
applicable terms and conditions of this paragraph (d).

          (e)  The provisions of this Section will remain in full force and
effect, regardless of any investigation made by or on behalf of any Holder or
the Company or any of the officers, directors or controlling Persons referred to
in this Section hereof, and will survive the sale by a Holder of securities
covered by a Registration Statement.

     7.   UNDERWRITTEN REGISTRATIONS.

          (a)  If any of the Securities or New Securities, as the case may be,
covered by any Shelf Registration Statement are to be sold in an underwritten
offering, the Managing Underwriters shall be selected by the Majority Holders.

          (b)  No Person may participate in any underwritten offering pursuant
to any Shelf Registration Statement, unless such Person (i) agrees to sell such
Person's Securities or New Securities, as the case may be, on the basis
reasonably provided in any underwriting arrangements approved by the Persons
entitled hereunder to approve such arrangements; and (ii) completes and executes
all questionnaires, powers of attorney, indemnities, underwriting agreements and
other documents reasonably required under the terms of such underwriting
arrangements.

     8.   NO INCONSISTENT AGREEMENTS. The Company has not, as of the date
hereof, entered into, nor shall it, on or after the date hereof, enter into, any
agreement with respect to its securities that is inconsistent with the rights
granted to the Holders herein or otherwise conflicts with the provisions hereof.

     9.   AMENDMENTS AND WAIVERS. The provisions of this Agreement, including
the provisions of this sentence, may not be amended, qualified, modified or
supplemented, and waivers or consents to departures from the provisions hereof
may not be given, unless the Company has obtained the written consent of the
Majority Holders (or, after the consummation of any Registered Exchange Offer in
accordance with Section 2 hereof, of New Securities); provided that, with
respect to any matter that directly or indirectly affects the rights of any
Initial Purchaser hereunder, the Company shall obtain the written consent of
each such Initial Purchaser against which such amendment, qualification,
supplement, waiver or consent is to be effective. Notwithstanding the foregoing
(except the foregoing proviso), a waiver or consent to departure from the
provisions hereof with respect to a matter that relates exclusively to the
rights of Holders whose Securities or New Securities, as the case may be, are
being sold pursuant to a Registration Statement and that does not directly or
indirectly affect the rights of other Holders may be given by the Majority
Holders, determined on the basis of Securities or New Securities, as the case
may be, being sold rather than registered under such Registration Statement.

                                      -16-
<Page>

     10.  NOTICES. All notices and other communications provided for or
permitted hereunder shall be made in writing by hand-delivery, first-class mail,
telex, telecopier or air courier guaranteeing overnight delivery:

          (a)  if to a Holder, at the most current address given by such holder
to the Company in accordance with the provisions of this Section, which address
initially is, with respect to each Holder, the address of such Holder maintained
by the Registrar under the Mortgage, with a copy in like manner to Salomon Smith
Barney Inc. at its address set forth in the Purchase Agreement;

          (b)  if to you, initially at the respective addresses set forth in the
Purchase Agreement; and

          (c)  if to the Company, initially at its address set forth in the
Purchase Agreement.

     All such notices and communications shall be deemed to have been duly given
when received.

     The Initial Purchasers or the Company by notice to the other parties may
designate additional or different addresses for subsequent notices or
communications.

     11.  SUCCESSORS. This Agreement shall inure to the benefit of and be
binding upon the successors and assigns of each of the parties, including,
without the need for an express assignment or any consent by the Company
thereto, subsequent Holders of Securities and the New Securities. The Company
hereby agrees to extend the benefits of this Agreement to any Holder of
Securities and the New Securities, and any such Holder may specifically enforce
the provisions of this Agreement as if an original party hereto.

     12.  COUNTERPARTS. This agreement may be in signed counterparts, each of
which shall an original and all of which together shall constitute one and the
same agreement.

     13.  HEADINGS. The headings used herein are for convenience only and shall
not affect the construction hereof.

     14.  APPLICABLE LAW. This Agreement shall be governed by and construed in
accordance with the laws of the State of New York applicable to contracts made
and to be performed in the State of New York.

     15.  SEVERABILITY. In the event that any one of more of the provisions
contained herein, or the application thereof in any circumstances, is held
invalid, illegal or unenforceable in any respect for any reason, the validity,
legality and enforceability of any such provision in every other respect and of
the remaining provisions hereof shall not be in any way impaired or affected
thereby, it being intended that all of the rights and privileges of the parties
shall be enforceable to the fullest extent permitted by law.

     16.  SECURITIES HELD BY THE COMPANY, ETC. Whenever the consent or approval
of Holders of a specified percentage of principal amount of Securities or New
Securities is required

                                      -17-
<Page>

hereunder, Securities or New Securities, as applicable, held by the Company or
its Affiliates (other than subsequent Holders of Securities or New Securities if
such subsequent Holders are deemed to be Affiliates solely by reason of their
holdings of such Securities or New Securities) shall not be counted in
determining whether such consent or approval was given by the Holders of such
required percentage.

                            [signature page follows]

                                      -18-
<Page>

     If the foregoing is in accordance with your understanding of our agreement,
please sign and return to us the enclosed duplicate hereof, whereupon this
letter and your acceptance shall represent a binding agreement among the Company
and the several Initial Purchasers.

                                                     Very truly yours,

                                                     COMMONWEALTH EDISON COMPANY

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

The foregoing Agreement is hereby confirmed and
accepted as of the date first above written.

SALOMON SMITH BARNEY INC.
J.P. MORGAN SECURITIES INC.

By:   SALOMON SMITH BARNEY INC.

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

For themselves and the other
several Initial Purchasers
named in Schedule I to the
Purchase Agreement.

<Page>

                                                                         ANNEX A

     Each Broker-Dealer that receives New Securities for its own account
pursuant to the Exchange Offer must acknowledge that it will deliver a
prospectus in connection with any resale of such New Securities. The Letter of
Transmittal states that by so acknowledging and by delivering a prospectus, a
Broker-Dealer will not be deemed to admit that it is an "underwriter" within the
meaning of the Securities Act. This Prospectus, as it may be amended or
supplemented from time to time, may be used by a Broker-Dealer in connection
with resales of New Securities received in exchange for Securities where such
Securities were acquired by such Broker-Dealer as a result of market-making
activities or other trading activities. The Company has agreed that, starting on
the Expiration Date (as defined herein) and ending on the close of business one
year after the Expiration Date, it will make this Prospectus available to any
Broker-Dealer for use in connection with any such resale. See "Plan of
Distribution".

<Page>

                                                                         ANNEX B

     Each Broker-Dealer that receives New Securities for its own account in
exchange for Securities, where such Securities were acquired by such
Broker-Dealer as a result of market-making activities or other trading
activities, must acknowledge that it will deliver a prospectus in connection
with any resale of such New Securities. See "Plan of Distribution".

<Page>

                                                                         ANNEX C

                              PLAN OF DISTRIBUTION

     Each Broker-Dealer that receives New Securities for its own account
pursuant to the Exchange Offer must acknowledge that it will deliver a
prospectus in connection with any resale of such New Securities. This
Prospectus, as it may be amended or supplemented from time to time, may be used
by a Broker-Dealer in connection with resales of New Securities received in
exchange for Securities where such Securities were acquired as a result of
market-making activities or other trading activities. The Company has agreed
that, starting on the Expiration Date and ending on the close of business one
year after the Expiration Date, it will make this Prospectus, as amended or
supplemented, available to any Broker-Dealer for use in connection with any such
resale. In addition, until __________, 20___, all dealers effecting transactions
in the New Securities may be required to deliver a prospectus.

     The Company will not receive any proceeds from any sale of New Securities
by brokers-dealers. New Securities received by Broker-Dealers for their own
account pursuant to the Exchange Offer may be sold from time to time in one or
more transactions in the over-the-counter market, in negotiated transactions,
through the writing of options on the New Securities or a combination of such
methods of resale, at market prices prevailing at the time of resale, at prices
related to such prevailing market prices or negotiated prices. Any such resale
may be made directly to purchasers or to or through brokers or dealers who may
receive compensation in the form of commissions or concessions from any such
Broker-Dealer and/or the purchasers of any such New Securities. Any
Broker-Dealer that resells New Securities that were received by it for its own
account pursuant to the Exchange Offer and any broker or dealer that
participates in a distribution of such New Securities may be deemed to be an
"underwriter" within the meaning of the Securities Act and any profit of any
such resale of New Securities and any commissions or concessions received by any
such Persons may be deemed to be underwriting compensation under the Securities
Act. The Letter of Transmittal states that by acknowledging that it will deliver
and by delivering a prospectus, a Broker-Dealer will not be deemed to admit that
it is an "underwriter" within the meaning of the Securities Act.

     For a period of one year after the Expiration Date, the Company will
promptly send additional copies of this Prospectus and any amendment or
supplement to this Prospectus to any Broker-Dealer that requests such documents
in the Letter of Transmittal. The Company has agreed to pay all expenses
incident to the Exchange Offer (including the expenses of one counsel for the
holder of the Securities) other than commissions or concessions of any brokers
or dealers and will indemnify the holders of the Securities (including any
Broker-Dealers) against certain liabilities, including liabilities under the
Securities Act.

<Page>

                                                                         ANNEX D

RIDER A

CHECK HERE IF YOU ARE A BROKER-DEALER AND WISH TO RECEIVE 10 ADDITIONAL COPIES
OF THE PROSPECTUS AND 10 COPIES OF ANY AMENDMENTS OR SUPPLEMENTS THERETO.

Name:       _________________________________
Address:    _________________________________
            _________________________________

RIDER B

If the undersigned is not a Broker-Dealer, the undersigned represents that it
acquired the New Securities in the ordinary course of its business, it is not
engaged in, and does not intend to engage in, a distribution of New Securities
and it has not arrangements or understandings with any Person to participate in
a distribution of the New Securities. If the undersigned is a Broker-Dealer that
will receive New Securities for its own account in exchange for Securities, it
represents that the Securities to be exchanged for New Securities were acquired
by it as a result of market-making activities or other trading activities and
acknowledges that it will deliver a prospectus in connection with any resale of
such New Securities; however, by so acknowledging and by delivering a
prospectus, the undersigned will not be deemed to admit that it is an
"underwriter" within the meaning of the Securities Act.<Page>

                                                                     EXHIBIT 4.5

                           COMMONWEALTH EDISON COMPANY

                                  $200,000,000

                 First Mortgage 6.15% Bonds, Series 98 Due 2012

                          REGISTRATION rights agreement

                                                              New York, New York
                                                                   June 20, 2002

Barclays Capital Inc.
First Union Securities, Inc.
  As Representatives of the Initial Purchasers
c/o Barclays Capital Inc.
222 Broadway
New York, New York  10038

Ladies and Gentlemen:

     Commonwealth Edison Company, a corporation organized under the laws of the
State of Illinois (the "Company"), proposes to issue and sell to certain
purchasers (the "Initial Purchasers") an additional $200,000,000 (the
"Securities") of the Company's outstanding First Mortgage 6.15% Bonds, Series
Due 2012 (the "Outstanding Securities"), upon the terms set forth in a purchase
agreement dated as of June 13, 2002 (the "Purchase Agreement"), relating to the
initial placement of the Securities (the "Initial Placement"). To induce the
Initial Purchasers to enter into the Purchase Agreement and to satisfy a
condition of your obligations thereunder, the Company agrees with you for your
benefit and the benefit of the holders from time to time of the Securities
(including the Initial Purchasers) (each a "Holder" and, together, the
"Holders"), as follows:

     1.   DEFINITIONS. Each of the capitalized terms used herein without
definition shall have the meaning set forth in the Purchase Agreement. As used
in this Agreement, the following capitalized defined terms shall have the
following meanings:

          "Act" shall mean the Securities Act of 1933, as amended, and the rules
and regulations of the Commission promulgated thereunder.

          "Affiliate" of any specified Person shall mean any other Person that,
directly or indirectly, is in control of, is controlled by, or is under common
control with, such specified Person. For purposes of this definition, control of
a Person shall mean the power, direct or indirect, to direct or cause the
direction of the management and policies of such Person whether by contract or
otherwise; and the terms "controlling" and "controlled" shall have meanings
correlative to the foregoing.

          "Broker-Dealer" shall mean any broker or dealer registered as such
under the Exchange Act.

<Page>

          "Business Day" shall mean any day other than a Saturday, a Sunday or a
legal holiday or a day on which banking institutions or trust companies are
authorized or obligated by law to close in New York City.

          "Commission" shall mean the Securities and Exchange Commission.

          "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended, and the rules and regulations of the Commission promulgated thereunder.

          "Exchange Offer Registration Period" shall mean the one-year period
following the consummation of the Registered Exchange Offer, exclusive of any
period during which any stop order shall be in effect suspending the
effectiveness of the Exchange Offer Registration Statement.

          "Exchange Offer Registration Statement" shall mean a registration
statement of the Company on an appropriate form under the Act with respect to
the Registered Exchange Offer, all amendments and supplements to such
registration statement, including post-effective amendments thereto, in each
case including the Prospectus contained therein, all exhibits thereto and all
material incorporated by reference therein.

          "Exchanging Dealer" shall mean any Holder (which may include any
Initial Purchaser) that is a Broker-Dealer and elects to exchange for New
Securities any Securities that it acquired for its own account as a result of
market-making activities or other trading activities (but not directly from the
Company or any Affiliate of the Company) for New Securities.

          "Final Memorandum" shall have the meaning set forth in the Purchase
Agreement.

          "Holder" shall have the meaning set forth in the preamble hereto.

          "Initial Placement" shall have the meaning set forth in the preamble
hereto.

          "Initial Purchaser" shall have the meaning set forth in the preamble
hereto.

          "Losses" shall have the meaning set forth in Section 6(d) hereof.

          "Majority Holders" shall mean the Holders of a majority of the
aggregate principal amount of Securities registered under a Registration
Statement.

          "Managing Underwriters" shall mean the investment banker or investment
bankers and manager or managers that shall administer an underwritten offering
of the Securities offered pursuant to a Shelf Registration Statement.

          "Mortgage" shall mean the Company's Mortgage relating to the
Securities, dated as of July 1, 1923, as amended and supplemented through the
date hereof, including by the Supplemental Indenture dated as of June 1, 2002
from the Company to BNY Midwest Trust Company, as trustee, and D.G. Donovan, as
co-trustee, as the same may be further amended from time to time in accordance
with the terms thereof.

                                       -2-
<Page>

          "New Securities" shall mean debt securities of the Company identical
in all material respects to the Securities (except that the interest rate
step-up provisions and the transfer restrictions shall be modified or
eliminated, as appropriate) and to be issued under the Mortgage.

          "Prospectus" shall mean the prospectus included in any Registration
Statement (including, without limitation, a prospectus that discloses
information previously omitted from a prospectus filed as part of an effective
registration statement in reliance upon Rule 430A under the Act), as amended or
supplemented by any prospectus supplement, with respect to the terms of the
offering of any portion of the Securities or the New Securities covered by such
Registration Statement, and all amendments and supplements thereto and all
material incorporated by reference therein.

          "Purchase Agreement" shall have the meaning set forth in the preamble
hereto.

          "Registered Exchange Offer" shall mean the proposed offer of the
Company to issue and deliver to the Holders of the Securities that are not
prohibited by any law or policy of the Commission from participating in such
offer, in exchange for the Securities, a like aggregate principal amount of the
New Securities.

          "Registration Statement" shall mean any Exchange Offer Registration
Statement or Shelf Registration Statement that covers any of the Securities or
the New Securities pursuant to the provisions of this Agreement, any amendments
and supplements to such registration statement, including post-effective
amendments (in each case including the Prospectus contained therein), all
exhibits thereto and all material incorporated by reference therein.

          "Securities" shall have the meaning set forth in the preamble hereto.

          "Shelf Registration" shall mean a registration effected pursuant to
Section 3 hereof.

          "Shelf Registration Period" has the meaning set forth in Section 3(b)
hereof.

          "Shelf Registration Statement" shall mean a "shelf" registration
statement of the Company pursuant to the provisions of Section 3 hereof which
covers some or all of the Securities or New Securities, as applicable, on an
appropriate form under Rule 415 under the Act, or any similar rule that may be
adopted by the Commission, amendments and supplements to such registration
statement, including post-effective amendments, in each case including the
Prospectus contained therein, all exhibits thereto and all material incorporated
by reference therein.

          "Trustee" shall mean the corporate trustee with respect to the
Securities under the Mortgage.

          "Underwriter" shall mean any underwriter of Securities in connection
with an offering thereof under a Shelf Registration Statement.

                                       -3-
<Page>

     2.   REGISTERED EXCHANGE OFFER.

          (a)  To the extent not prohibited by any applicable law or applicable
interpretation of the Staff of the Commission, the Company shall use its best
efforts to consummate the Registered Exchange Offer no later than December 8,
2002 (or if such day is not a Business Day, the next succeeding Business Day).

          (b)  Upon the effectiveness of the Exchange Offer Registration
Statement, the Company shall promptly commence the Registered Exchange Offer, it
being the objective of such Registered Exchange Offer to enable each Holder
electing to exchange Securities for New Securities (assuming that such Holder is
not an Affiliate of the Company, acquires the New Securities in the ordinary
course of such Holder's business, has no arrangements with any Person to
participate in the distribution of the New Securities and is not prohibited by
any law or policy of the Commission from participating in the Registered
Exchange Offer) to trade such New Securities from and after their receipt
without any limitations or restrictions under the Act and without material
restrictions under the securities laws of a substantial proportion of the
several states of the United States.

          (c)  In connection with the Registered Exchange Offer, the Company
shall:

               (i)    mail to each Holder a copy of the Prospectus forming part
          of the Exchange Offer Registration Statement, together with an
          appropriate letter of transmittal and related documents;

               (ii)   keep the Registered Exchange Offer open for not less than
          20 Business Days and not more than 30 Business Days after the date
          notice thereof is mailed to the Holders (or, in each case, longer if
          required by applicable law);

               (iii)  use its best efforts to keep the Exchange Offer
          Registration Statement continuously effective under the Act,
          supplemented and amended as required, under the Act to ensure that it
          is available for sales of New Securities by Exchanging Dealers during
          the Exchange Offer Registration Period;

               (iv)   utilize the services of a depositary for the Registered
          Exchange Offer with an address in the Borough of Manhattan in New York
          City, which may be the Trustee or an Affiliate of the Trustee;

               (v)    permit Holders to withdraw tendered Securities at any time
          prior to the close of business, New York time, on the last Business
          Day on which the Registered Exchange Offer is open;

               (vi)   prior to effectiveness of the Exchange Offer Registration
          Statement, provide a supplemental letter to the Commission (A) stating
          that the Company is conducting the Registered Exchange Offer in
          reliance on the position of the Commission in EXXON CAPITAL HOLDINGS
          CORPORATION (pub. avail. May 13, 1988), and MORGAN STANLEY AND CO.,
          INC. (pub. avail. June 5, 1991); and (B) including a representation
          that the Company has not entered into any arrangement or understanding
          with any Person to distribute the New Securities to be received

                                       -4-
<Page>

          in the Registered Exchange Offer and that, to the best of the
          Company's information and belief, each Holder participating in the
          Registered Exchange Offer is acquiring the New Securities in the
          ordinary course of business and has no arrangement or understanding
          with any Person to participate in the distribution of the New
          Securities; and

               (vii)  comply in all respects with all applicable laws.

          (d)  As soon as practicable after the close of the Registered Exchange
Offer, the Company shall:

               (i)    accept for exchange all Securities tendered and not
          validly withdrawn pursuant to the Registered Exchange Offer;

               (ii)   deliver to the Trustee for cancellation in accordance with
          Section 4(s) all Securities so accepted for exchange; and

               (iii)  cause the Trustee promptly to authenticate and deliver to
          each Holder of Securities a principal amount of New Securities equal
          to the principal amount of the Securities of such Holder so accepted
          for exchange.

          (e)  Each Holder hereby acknowledges and agrees that any Broker-Dealer
and any such Holder using the Registered Exchange Offer to participate in a
distribution of the New Securities (x) could not under Commission policy as in
effect on the date of this Agreement rely on the position of the Commission in
MORGAN STANLEY AND CO., INC. (pub. avail. June 5, 1991) and EXXON CAPITAL
HOLDINGS CORPORATION (pub. avail. May 13, 1988), as interpreted in the
Commission's letter to SHEARMAN & STERLING dated July 2, 1993 and similar
no-action letters; (y) must comply with the registration and prospectus delivery
requirements of the Act in connection with any secondary resale transaction; and
(z) must be covered by an effective registration statement containing the
selling security holder information required by Item 507 or 508, as applicable,
of Regulation S-K under the Act if the resales are of New Securities obtained by
such Holder in exchange for Securities acquired by such Holder directly from the
Company or one of its Affiliates. Accordingly, each Holder participating in the
Registered Exchange Offer shall be required to represent to the Company that, at
the time of the consummation of the Registered Exchange Offer:

               (i)    any New Securities received by such Holder will be
          acquired in the ordinary course of business;

               (ii)   such Holder will have no arrangement or understanding with
          any Person to participate in the distribution of the Securities or the
          New Securities within the meaning of the Act; and

               (iii)  such Holder is not an Affiliate of the Company.

          (f)  If any Initial Purchaser determines that it is not eligible to
participate in the Registered Exchange Offer with respect to the exchange of
Securities constituting any portion of an unsold allotment, at the request of
such Initial Purchaser, the Company shall issue

                                       -5-
<Page>

and deliver to such Initial Purchaser or the Person purchasing New Securities
registered under a Shelf Registration Statement as contemplated by Section 3
hereof from such Initial Purchaser, in exchange for such Securities, a like
principal amount of New Securities. The Company shall use its best efforts to
cause the CUSIP Service Bureau to issue the same CUSIP number for such New
Securities as for New Securities issued pursuant to the Registered Exchange
Offer.

     3.   SHELF REGISTRATION.

          (a)  If (i) due to any change in law or applicable interpretations
thereof by the Commission's staff, the Company determines upon advice of its
outside counsel that it is not permitted to effect the Registered Exchange Offer
as contemplated by Section 2 hereof;

               (ii)   for any other reason the Registered Exchange Offer is not
          consummated within 270 days of the date hereof;

               (iii)  any Initial Purchaser so requests with respect to
          Securities that are not eligible to be exchanged for New Securities in
          the Registered Exchange Offer and that are held by it following
          consummation of the Registered Exchange Offer;

               (iv)   any Holder (other than an Initial Purchaser) is not
          eligible to participate in the Registered Exchange Offer; or

               (v)    in the case of any Initial Purchaser that participates in
          the Registered Exchange Offer or acquires New Securities pursuant to
          Section 2(f) hereof, such Initial Purchaser does not receive freely
          tradeable New Securities in exchange for Securities constituting any
          portion of an unsold allotment (it being understood that (x) the
          requirement that an Initial Purchaser deliver a Prospectus containing
          the information required by Item 507 or 508 of Regulation S-K under
          the Act in connection with sales of New Securities acquired in
          exchange for such Securities shall result in such New Securities being
          not "freely tradeable"; and (y) the requirement that an Exchanging
          Dealer deliver a Prospectus in connection with sales of New Securities
          acquired in the Registered Exchange Offer in exchange for Securities
          acquired as a result of market-making activities or other trading
          activities shall not result in such New Securities being not "freely
          tradeable"), the Company shall effect a Shelf Registration Statement
          in accordance with subsection (b) below.

          (b)  (i) To the extent not prohibited by any applicable law or
applicable interpretation of the Staff of the Commission, the Company shall as
promptly as practicable (but in no event more than 60 days after so required or
requested pursuant to this Section 3), file with the Commission and thereafter
shall use its best efforts to cause to be declared effective under the Act a
Shelf Registration Statement relating to the offer and sale of the Securities or
the New Securities, as applicable, by the Holders thereof from time to time in
accordance with the methods of distribution elected by such Holders and set
forth in such Shelf Registration Statement; PROVIDED, HOWEVER, that no Holder
(other than an Initial Purchaser) shall be entitled to have the Securities held
by it covered by such Shelf Registration Statement unless such Holder agrees in
writing to be bound by all of the provisions of this Agreement applicable to
such

                                       -6-
<Page>

Holder; and provided further, that with respect to New Securities received by an
Initial Purchaser in exchange for Securities constituting any portion of an
unsold allotment, the Company may, if permitted by current interpretations by
the Commission's staff, file a post-effective amendment to the Exchange Offer
Registration Statement containing the information required by Item 507 or 508 of
Regulation S-K, as applicable, in satisfaction of its obligations under this
subsection with respect thereto, and any such Exchange Offer Registration
Statement, as so amended, shall be referred to herein as, and governed by the
provisions herein applicable to, a Shelf Registration Statement.

               (ii)   The Company shall use its best efforts to keep the Shelf
          Registration Statement continuously effective, supplemented and
          amended as required by the Act, in order to permit the Prospectus
          forming part thereof to be usable by Holders for a period of two years
          from the date the Shelf Registration Statement is declared effective
          by the Commission or such shorter period that will terminate when all
          the Securities or New Securities, as applicable, covered by the Shelf
          Registration Statement have been sold pursuant to the Shelf
          Registration Statement (in any such case, such period being called the
          "Shelf Registration Period"). The Company shall be deemed not to have
          used its best efforts to keep the Shelf Registration Statement
          effective during the requisite period if it voluntarily takes any
          action that would result in Holders of Securities covered thereby not
          being able to offer and sell such Securities during that period,
          unless (A) such action is required by applicable law; or (B) such
          action is taken by the Company in good faith and for valid business
          reasons (not including avoidance of the Company's obligations
          hereunder), including the acquisition or divestiture of assets,
          business combinations or similar significant corporate transactions
          involving the Company or Exelon Corporation so long as the Company
          promptly thereafter complies with the requirements of Section 4(j)
          hereof, if applicable.

     4.   ADDITIONAL REGISTRATION PROCEDURES. In connection with any Shelf
Registration Statement and, to the extent applicable, any Exchange Offer
Registration Statement, the following provisions shall apply.

          (a)  The Company shall:

               (i)    furnish to you, not less than five Business Days prior to
          the filing thereof with the Commission, a copy of any Exchange Offer
          Registration Statement and any Shelf Registration Statement, and each
          amendment thereof and each amendment or supplement, if any, to the
          Prospectus included therein (including all documents incorporated by
          reference therein after the initial filing) and shall use its best
          efforts to reflect in each such document, when so filed with the
          Commission, such comments as you reasonably propose;

               (ii)   include the information set forth in Annex A hereto on the
          facing page of the Exchange Offer Registration Statement, in Annex B
          hereto in the forepart of the Exchange Offer Registration Statement in
          a section setting forth details of the Exchange Offer, in Annex C
          hereto in the underwriting or plan of distribution section of the
          Prospectus contained in the Exchange Offer

                                       -7-
<Page>

          Registration Statement, and in Annex D hereto in the letter of
          transmittal delivered pursuant to the Registered Exchange Offer;

               (iii)  if requested by an Initial Purchaser, include the
          information required by Item 507 or 508 of Regulation S-K, as
          applicable, in the Prospectus contained in the Exchange Offer
          Registration Statement or Shelf Registration Statement; and

               (iv)   in the case of a Shelf Registration Statement, include the
          names of the Holders that propose to sell Securities pursuant to the
          Shelf Registration Statement as selling security holders.

          (b)  The Company shall advise you, the Holders of Securities covered
by any Shelf Registration Statement and any Exchanging Dealer under any Exchange
Offer Registration Statement that has provided in writing to the Company a
telephone or facsimile number and address for notices, and, if requested by you
or any such Holder or Exchanging Dealer, shall confirm such advice in writing
(which notice pursuant to clauses (ii)-(v) hereof shall be accompanied by an
instruction to suspend the use of the Prospectus until the Company shall have
remedied the basis for such suspension):

               (i)    when a Registration Statement and any amendment thereto
          has been filed with the Commission and when the Registration Statement
          or any post-effective amendment thereto has become effective;

               (ii)   of any request by the Commission for any amendment or
          supplement to the Registration Statement or the Prospectus or for
          additional information;

               (iii)  of the issuance by the Commission of any stop order
          suspending the effectiveness of the Registration Statement or the
          initiation of any proceedings for that purpose;

               (iv)   of the receipt by the Company of any notification with
          respect to the suspension of the qualification of the securities
          included therein for sale in any jurisdiction or the initiation of any
          proceeding for such purpose; and

               (v)    of the happening of any event that requires any change in
          the Registration Statement or the Prospectus so that, as of such date,
          the statements therein are not misleading and do not omit to state a
          material fact required to be stated therein or necessary to make the
          statements therein (in the case of the Prospectus, in the light of the
          circumstances under which they were made) not misleading.

          (c)  The Company shall use its best efforts to obtain the withdrawal
of any order suspending the effectiveness of any Registration Statement or the
qualification of the securities therein for sale in any jurisdiction at the
earliest possible time.

                                       -8-
<Page>

          (d)  The Company shall furnish to each Holder of Securities covered by
any Shelf Registration Statement, without charge, at least one copy of such
Shelf Registration Statement and any post-effective amendment thereto, including
all material incorporated therein by reference, and, if the Holder so requests
in writing, all exhibits thereto (including exhibits incorporated by reference
therein).

          (e)  The Company shall, during the Shelf Registration Period, deliver
to each Holder of Securities covered by any Shelf Registration Statement,
without charge, as many copies of the Prospectus (including each preliminary
Prospectus) included in such Shelf Registration Statement and any amendment or
supplement thereto as such Holder may reasonably request. The Company consents
to the use of the Prospectus or any amendment or supplement thereto by each of
the selling Holders of Securities in connection with the offering and sale of
the Securities covered by the Prospectus, or any amendment or supplement
thereto, included in the Shelf Registration Statement.

          (f)  The Company shall furnish to each Exchanging Dealer which so
requests, without charge, at least one copy of the Exchange Offer Registration
Statement and any post-effective amendment thereto, including all material
incorporated by reference therein, and, if the Exchanging Dealer so requests in
writing, all exhibits thereto (including exhibits incorporated by reference
therein).

          (g)  The Company shall promptly deliver to each Initial Purchaser,
each Exchanging Dealer and each other Person required to deliver a Prospectus
during the Exchange Offer Registration Period, without charge, as many copies of
the Prospectus included in such Exchange Offer Registration Statement and any
amendment or supplement thereto as any such Person may reasonably request. The
Company consents to the use of the Prospectus or any amendment or supplement
thereto by any Initial Purchaser, any Exchanging Dealer and any such other
Person that may be required to deliver a Prospectus following the Registered
Exchange Offer in connection with the offering and sale of the New Securities
covered by the Prospectus, or any amendment or supplement thereto, included in
the Exchange Offer Registration Statement.

          (h)  Prior to the Registered Exchange Offer or any other offering of
Securities pursuant to any Registration Statement, the Company shall arrange, if
necessary, for the qualification of the Securities or the New Securities for
sale under the laws of such jurisdictions as any Holder shall reasonably request
and will maintain such qualification in effect so long as required; provided
that in no event shall the Company be obligated to qualify to do business in any
jurisdiction where it is not then so qualified or to take any action that would
subject it to service of process in suits, other than those arising out of the
Initial Placement, the Registered Exchange Offer or any offering pursuant to a
Shelf Registration Statement, in any such jurisdiction where it is not then so
subject.

          (i)  The Company shall cooperate with the Holders of Securities to
facilitate the timely preparation and delivery of certificates representing New
Securities or Securities to be issued or sold pursuant to any Registration
Statement free of any restrictive legends and in such denominations and
registered in such names as Holders may request.

                                       -9-
<Page>

          (j)  Upon the occurrence of any event contemplated by subsections
(b)(ii) through (v) above, the Company shall promptly prepare a post-effective
amendment to the applicable Registration Statement or an amendment or supplement
to the related Prospectus or file any other required document so that, as
thereafter delivered to Initial Purchasers of the Securities included therein,
the Prospectus will not include an untrue statement of a material fact or omit
to state any material fact necessary to make the statements therein, in the
light of the circumstances under which they were made, not misleading. In such
circumstances, the period of effectiveness of the Exchange Offer Registration
Statement provided for in Section 2 and the Shelf Registration Statement
provided for in Section 3(b) shall each be extended by the number of days from
and including the date of the giving of a notice of suspension pursuant to
Section 4(b) to and including the date when the Initial Purchasers, the Holders
of the Securities and any known Exchanging Dealer shall have received such
amended or supplemented Prospectus pursuant to this Section.

          (k)  Not later than the effective date of any Registration Statement,
the Company shall obtain the CUSIP number assigned to the Outstanding Securities
for the Securities or the New Securities, as the case may be, registered under
such Registration Statement and provide the Trustee with certificates for such
Securities or New Securities, in a form eligible for deposit with The Depository
Trust Company.

          (l)  The Company shall make generally available to its security
holders as soon as practicable after the effective date of the applicable
Registration Statement an earnings statement satisfying the provisions of
Section 11(a) of the Act.

          (m)  The Company shall cause the Mortgage to be qualified under the
Trust Indenture Act in a timely manner.

          (n)  The Company may require each Holder of Securities to be sold
pursuant to any Shelf Registration Statement to furnish to the Company such
information regarding the Holder and the distribution of such Securities as the
Company may from time to time reasonably require for inclusion in such
Registration Statement. The Company may exclude from such Shelf Registration
Statement the Securities of any Holder that unreasonably fails to furnish such
information within a reasonable time after receiving such request and the
Company shall be under no further obligations to such Holder to include such
Holder in a Shelf Registration Statement.

          (o)  In the case of any Shelf Registration Statement, the Company
shall enter into such and take all other appropriate actions (including if
requested an underwriting agreement in customary form) in order to expedite or
facilitate the registration or the disposition of the Securities, and in
connection therewith, if an underwriting agreement is entered into, cause the
same to contain indemnification provisions and procedures no less favorable than
those set forth in Section 6 (or such other provisions and procedures acceptable
to the Majority Holders and the Managing Underwriters, if any, with respect to
all parties to be indemnified pursuant to Section 6.

          (p)  In the case of any Shelf Registration Statement, the Company
shall:

                                      -10-
<Page>

               (i)    subject to execution of a confidentiality agreement in
          form and substance reasonably acceptable to the Company and the
          Holders, make reasonably available for inspection by the Holders of
          Securities to be registered thereunder, any underwriter participating
          in any disposition pursuant to such Registration Statement, and any
          attorney, accountant or other agent retained by the Holders or any
          such underwriter all relevant financial and other records, pertinent
          corporate documents and properties of the Company and its
          subsidiaries;

               (ii)   cause the Company's officers, directors and employees to
          supply all relevant information reasonably requested by the Holders or
          any such underwriter, attorney, accountant or agent in connection with
          any such Registration Statement as is customary for similar due
          diligence examinations; provided, however, that any information that
          is designated in writing by the Company, in good faith, as
          confidential at the time of delivery of such information shall be kept
          confidential by the Holders or any such underwriter, attorney,
          accountant or agent, unless such disclosure is made in connection with
          a court proceeding or required by law, or such information becomes
          available to the public generally or through a third party without an
          accompanying obligation of confidentiality;

               (iii)  make such representations and warranties to the Holders of
          Securities registered thereunder and the underwriters, if any, in
          form, substance and scope as are customarily made by issuers to
          underwriters in underwritten offerings and covering those matters set
          forth in the Purchase Agreement;

               (iv)   obtain opinions of counsel to the Company and updates
          thereof (which counsel and opinions (in form, scope and substance)
          shall be reasonably satisfactory to the Managing Underwriters, if any)
          addressed to each selling Holder and the underwriters, if any,
          covering the matters covered in the opinion delivered under the
          Purchase Agreement and matters related to registration of the
          Securities under the Act and the qualification of the Mortgage under
          the Trust Indenture Act of 1940, as amended;

               (v)    obtain "cold comfort" letters and updates thereof from the
          independent certified public accountants of the Company (and, if
          necessary, any other independent certified public accountants of any
          subsidiary of the Company or of any business acquired by the Company
          for which financial statements and financial data are, or are required
          to be, included in the Registration Statement), addressed to each
          selling Holder of Securities registered thereunder and the
          underwriters, if any, in customary form and covering matters of the
          type customarily covered in "cold comfort" letters in connection with
          primary underwritten offerings; and

               (vi)   deliver such documents and certificates as may be
          reasonably requested by the Majority Holders and the Managing
          Underwriters, if any, including those to evidence compliance with
          Section 4(k) and with any customary

                                      -11-
<Page>

          conditions contained in the underwriting agreement or other agreement
          entered into by the Company.

     The actions set forth in clauses (iii), (iv), (v) and (vi) of this Section
shall be performed at each closing under any underwriting or similar agreement
as and to the extent required thereunder.

          (q)  If a Registered Exchange Offer is to be consummated, upon
delivery of the Securities by Holders to the Company (or to such other Person as
directed by the Company) in exchange for the New Securities, the Company shall
mark, or caused to be marked, on the Securities so exchanged that such
Securities are being canceled in exchange for the New Securities. In no event
shall the Securities be marked as paid or otherwise satisfied.

          (r)  The Company will use its best efforts (i) if the Securities have
been rated prior to the initial sale of such Securities pursuant to the Purchase
Agreement, to confirm such ratings will apply to the Securities or the New
Securities, as the case may be, covered by a Registration Statement; or (ii) if
the Securities were not previously rated, to cause the Securities covered by a
Registration Statement to be rated with at least one nationally recognized
statistical rating agency, if so requested by Majority Holders with respect to
the related Registration Statement or by any Managing Underwriters.

          (s)  In the event that any Broker-Dealer shall underwrite any
Securities or participate as a member of an underwriting syndicate or selling
group or "assist in the distribution" (within the meaning of the Rules of Fair
Practice and the By-Laws of the National Association of Securities Dealers,
Inc.) thereof, whether as a Holder of such Securities or as an underwriter, a
placement or sales agent or a broker or dealer in respect thereof, or otherwise,
assist such Broker-Dealer in complying with the requirements of such Rules and
By-Laws, including, without limitation, by:

               (i)    if such Rules or By-Laws shall so require, engaging a
          "qualified independent underwriter" (as defined in such Rules) to
          participate in the preparation of the Registration Statement, to
          exercise usual standards of due diligence with respect thereto and, if
          any portion of the offering contemplated by such Registration
          Statement is an underwritten offering or is made through a placement
          or sales agent, to recommend the yield of such Securities;

               (ii)   indemnifying any such qualified independent underwriter to
          the extent of the indemnification of underwriters provided in Section
          6 hereof; and

               (iii)  providing such information to such Broker-Dealer as may be
          required in order for such Broker-Dealer to comply with the
          requirements of such Rules.

          (t)  The Company shall use its best efforts to take all other steps
necessary to effect the registration of the Securities or the New Securities, as
the case may be, covered by a Registration Statement.

                                      -12-
<Page>

     5.   REGISTRATION EXPENSES. The Company shall bear all expenses incurred in
connection with the performance of its obligations under Sections 2, 3 and 4
hereof and, in the event of any Shelf Registration Statement, will reimburse the
Holders for the reasonable fees and disbursements of one firm or counsel
designated by the Majority Holders to act as counsel for the Holders in
connection therewith, and, in the case of any Exchange Offer Registration
Statement, will reimburse the Initial Purchasers for the reasonable fees and
disbursements of their counsel incurred in connection with their review of the
Exchange Offer Registration Statement.

     6.   INDEMNIFICATION AND CONTRIBUTION.

          (a)  The Company agrees to indemnify and hold harmless each Holder of
Securities or New Securities, as the case may be, covered by any Registration
Statement (including each Initial Purchaser and, with respect to any Prospectus
delivery as contemplated in Section 4(h) hereof, each Exchanging Dealer), the
directors, officers, employees and agents of each such Holder and each Person
who controls any such Holder within the meaning of either the Act or the
Exchange Act against any and all losses, claims, damages or liabilities, joint
or several, to which they or any of them may become subject under the Act, the
Exchange Act or other Federal or state statutory law or regulation, at common
law or otherwise, insofar as such losses, claims, damages or liabilities (or
actions in respect thereof) arise out of or are based upon any untrue statement
or alleged untrue statement of a material fact contained in the Registration
Statement as originally filed or in any amendment thereof, or in any preliminary
Prospectus or the Prospectus, or in any amendment thereof or supplement thereto,
or arise out of or are based upon the omission or alleged omission to state
therein a material fact required to be stated therein or necessary to make the
statements therein not misleading, and agrees to reimburse each such indemnified
party, as incurred, for any legal or other expenses reasonably incurred by them
in connection with investigating or defending any such loss, claim, damage,
liability or action; provided, however, that the Company will not be liable in
any case to the extent that any such loss, claim, damage or liability arises out
of or is based upon any such untrue statement or alleged untrue statement or
omission or alleged omission made therein in reliance upon and in conformity
with written information furnished to the Company by or on behalf of any such
Holder specifically for inclusion therein; provided, further, that such
indemnity with respect to any untrue statement contained in or omission from the
preliminary Prospectus shall not inure to the benefit of any Holder (or any
person controlling such holder) from whom the person asserting such loss, claim,
damage or liability purchased any of the Securities or New Securities which are
the subject thereof if such person did not receive a copy of the Prospectus (or,
if the Prospectus shall have been amended or supplemented, the Prospectus as
then amended or supplemented), excluding incorporated documents, at or prior to
the confirmation of sale of such securities or New Securities to such person in
any case where such delivery is required by the Act and the untrue statement or
omission of a material fact contained in such preliminary Prospectus was
corrected in the Prospectus as then amended or supplemented), and it is finally
judicially determined that such delivery was required to be made under the Act
and was no so made. This indemnity agreement will be in addition to any
liability which the Company may otherwise have.

     The Company also agrees to indemnify or contribute as provided in Section
6(d) to Losses of each and any person deemed an "underwriter", under the Act or
the rules and regulations thereunder, of Securities or New Securities, as the
case may be, registered under a

                                      -13-
<Page>

Shelf Registration Statement, their directors, officers, employees or agents and
each Person who controls such underwriter on substantially the same basis as
that of the indemnification of the Initial Purchasers and the selling Holders
provided in this Section 6(a) and shall, if requested by any Holder, enter into
an underwriting agreement reflecting such agreement, as provided in Section 4(p)
hereof.

          (b)  Each Holder of securities covered by a Registration Statement
(including each Initial Purchaser and, with respect to any Prospectus delivery
as contemplated in Section 4(h) hereof, each Exchanging Dealer) severally agrees
to indemnify and hold harmless the Company each of its directors each of its
officers who signs such Registration Statement and each Person who controls the
Company within the meaning of either the Act or the Exchange Act, to the same
extent as the foregoing indemnity from the Company to each such Holder, but only
with reference to written information relating to such Holder furnished to the
Company by or on behalf of such Holder specifically for inclusion in the
documents referred to in the foregoing indemnity. This indemnity agreement will
be in addition to any liability which any such Holder may otherwise have.

          (c)  Promptly after receipt by an indemnified party under this Section
6 of notice of the commencement of any action, such indemnified party will, if a
claim in respect thereof is to be made against the indemnifying party under this
Section, notify the indemnifying party in writing of the commencement thereof;
but the failure so to notify the indemnifying party (i) will not relieve it from
liability under paragraph (a) or (b) above unless and to the extent it did not
otherwise learn of such action and such failure results in the forfeiture by the
indemnifying party of substantial rights and defenses; and (ii) will not, in any
event, relieve the indemnifying party from any obligations to any indemnified
party other than the indemnification obligation provided in paragraph (a) or (b)
above. The indemnifying party shall be entitled to appoint counsel of the
indemnifying party's choice at the indemnifying party's expense to represent the
indemnified party in any action for which indemnification is sought (in which
case the indemnifying party shall not thereafter be responsible for the fees and
expenses of any separate counsel retained by the indemnified party or parties
except as set forth below); provided, however, that such counsel shall be
satisfactory to the indemnified party. Notwithstanding the indemnifying party's
election to appoint counsel to represent the indemnified party in an action, the
indemnified party shall have the right to employ separate counsel, and the
indemnifying party shall bear the reasonable fees, costs and expenses of such
separate counsel if (i) the use of counsel chosen by the indemnifying party to
represent the indemnified party would present such counsel with a conflict of
interest; (ii) the actual or potential defendants in, or targets of, any such
action include both the indemnified party and the indemnifying party and the
indemnified party shall have reasonably concluded that there may be legal
defenses available to it and/or other indemnified parties which are different
from or additional to those available to the indemnifying party; (iii) the
indemnifying party shall not have employed counsel satisfactory to the
indemnified party to represent the indemnified party within a reasonable time
after notice of the institution of such action; or (iv) the indemnifying party
shall authorize the indemnified party to employ separate counsel at the expense
of the indemnifying party; provided, however, that the indemnifying party shall
not be responsible for the fees and expenses of more than one separate firm
representing indemnified parties described in clauses (i) or (ii) of this
sentence. An indemnifying party will not, without the prior written consent of
the indemnified parties, settle or compromise or consent to the entry of any
judgment with respect to any pending or threatened

                                      -14-
<Page>

claim, action, suit or proceeding in respect of which indemnification or
contribution may be sought hereunder (whether or not the indemnified parties are
actual or potential parties to such claim or action) unless such settlement,
compromise or consent includes an unconditional release of each indemnified
party from all liability arising out of such claim, action, suit or proceeding.

          (d)  In the event that the indemnity provided in paragraph (a) or (b)
of this Section is for any reason held to be unenforceable by an indemnified
party although applicable in accordance with its terms, then each applicable
indemnifying party shall have a several and not joint obligation to contribute
to the aggregate losses, claims, damages and liabilities (including legal or
other expenses reasonably incurred in connection with investigating or defending
same) (collectively "Losses") to which such indemnified party may be subject in
such proportion as is appropriate to reflect the relative benefits received by
such indemnifying party, on the one hand, and such indemnified party, on the
other hand, from the Initial Placement and the Registration Statement which
resulted in such Losses; provided, however, that in no case shall any Initial
Purchaser or any subsequent Holder of any Security or New Security be
responsible, in the aggregate, for any amount in excess of the purchase discount
or commission applicable to such Security, or in the case of a New Security,
applicable to the Security that was exchangeable into such New Security, as set
forth on the cover page of the Final Memorandum, nor shall any underwriter be
responsible for any amount in excess of the underwriting discount or commission
applicable to the securities purchased by such underwriter under the
Registration Statement which resulted in such Losses. If the allocation provided
by the immediately preceding sentence is unavailable for any reason, the
indemnifying party and the indemnified party shall contribute in such proportion
as is appropriate to reflect not only such relative benefits but also the
relative fault of such indemnifying party, on the one hand, and such indemnified
party, on the other hand, in connection with the statements or omissions which
resulted in such Losses as well as any other relevant equitable considerations.
Benefits received by the Company shall be deemed to be equal to the sum of (x)
the total net proceeds from the Initial Placement (before deducting expenses) as
set forth on the cover page of the Final Memorandum and (y) the total amount of
additional interest which the Company was not required to pay as a result of
registering the securities covered by the Registration Statement which resulted
in such Losses. Benefits received by the Initial Purchasers shall be deemed to
be equal to the total purchase discounts and commissions as set forth on the
cover page of the Final Memorandum, and benefits received by any other Holders
shall be deemed to be equal to the value of receiving Securities or New
Securities, as applicable, registered under the Act. Benefits received by any
underwriter shall be deemed to be equal to the total underwriting discounts and
commissions, as set forth on the cover page of the Prospectus forming a part of
the Registration Statement which resulted in such Losses. Relative fault shall
be determined by reference to, among other things, whether any alleged untrue
statement or omission relates to information provided by the indemnifying party,
on the one hand, or by the indemnified party, on the other hand, the intent of
the parties and their relative knowledge, access to information and opportunity
to correct or prevent such untrue statement or omission. The parties agree that
it would not be just and equitable if contribution were determined by pro rata
allocation (even if the Holders were treated as one entity for such purpose) or
any other method of allocation which does not take account of the equitable
considerations referred to above. Notwithstanding the provisions of this
paragraph (d), no Person guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the Act) shall be entitled to contribution from any
Person who was not guilty of such fraudulent misrepresentation. For purposes of
this Section, each Person who controls a Holder within the

                                      -15-
<Page>

meaning of either the Act or the Exchange Act and each director, officer,
employee and agent of such Holder shall have the same rights to contribution as
such Holder, and each Person who controls the Company within the meaning of
either the Act or the Exchange Act, each officer of the Company who shall have
signed the Registration Statement and each director of the Company shall have
the same rights to contribution as the Company, subject in each case to the
applicable terms and conditions of this paragraph (d).

          (e)  The provisions of this Section will remain in full force and
effect, regardless of any investigation made by or on behalf of any Holder or
the Company or any of the officers, directors or controlling Persons referred to
in this Section hereof, and will survive the sale by a Holder of securities
covered by a Registration Statement.

     7.   UNDERWRITTEN REGISTRATIONS.

          (a)  If any of the Securities or New Securities, as the case may be,
covered by any Shelf Registration Statement are to be sold in an underwritten
offering, the Managing Underwriters shall be selected by the Majority Holders.

          (b)  No Person may participate in any underwritten offering pursuant
to any Shelf Registration Statement, unless such Person (i) agrees to sell such
Person's Securities or New Securities, as the case may be, on the basis
reasonably provided in any underwriting arrangements approved by the Persons
entitled hereunder to approve such arrangements; and (ii) completes and executes
all questionnaires, powers of attorney, indemnities, underwriting agreements and
other documents reasonably required under the terms of such underwriting
arrangements.

     8.   NO INCONSISTENT AGREEMENTS. The Company has not, as of the date
hereof, entered into, nor shall it, on or after the date hereof, enter into, any
agreement with respect to its securities that is inconsistent with the rights
granted to the Holders herein or otherwise conflicts with the provisions hereof.

     9.   AMENDMENTS AND WAIVERS. The provisions of this Agreement, including
the provisions of this sentence, may not be amended, qualified, modified or
supplemented, and waivers or consents to departures from the provisions hereof
may not be given, unless the Company has obtained the written consent of the
Majority Holders (or, after the consummation of any Registered Exchange Offer in
accordance with Section 2 hereof, of New Securities); provided that, with
respect to any matter that directly or indirectly affects the rights of any
Initial Purchaser hereunder, the Company shall obtain the written consent of
each such Initial Purchaser against which such amendment, qualification,
supplement, waiver or consent is to be effective. Notwithstanding the foregoing
(except the foregoing proviso), a waiver or consent to departure from the
provisions hereof with respect to a matter that relates exclusively to the
rights of Holders whose Securities or New Securities, as the case may be, are
being sold pursuant to a Registration Statement and that does not directly or
indirectly affect the rights of other Holders may be given by the Majority
Holders, determined on the basis of Securities or New Securities, as the case
may be, being sold rather than registered under such Registration Statement.

                                      -16-
<Page>

     10.  NOTICES. All notices and other communications provided for or
permitted hereunder shall be made in writing by hand-delivery, first-class mail,
telex, telecopier or air courier guaranteeing overnight delivery:

          (a)  if to a Holder, at the most current address given by such holder
to the Company in accordance with the provisions of this Section, which address
initially is, with respect to each Holder, the address of such Holder maintained
by the Registrar under the Mortgage, with a copy in like manner to Barclays
Capital Inc. at its address set forth in the Purchase Agreement;

          (b)  if to you, initially at the respective addresses set forth in the
Purchase Agreement; and

          (c)  if to the Company, initially at its address set forth in the
Purchase Agreement.

     All such notices and communications shall be deemed to have been duly given
when received.

     The Initial Purchasers or the Company by notice to the other parties may
designate additional or different addresses for subsequent notices or
communications.

     11.  SUCCESSORS. This Agreement shall inure to the benefit of and be
binding upon the successors and assigns of each of the parties, including,
without the need for an express assignment or any consent by the Company
thereto, subsequent Holders of Securities and the New Securities. The Company
hereby agrees to extend the benefits of this Agreement to any Holder of
Securities and the New Securities, and any such Holder may specifically enforce
the provisions of this Agreement as if an original party hereto.

     12.  COUNTERPARTS. This agreement may be in signed counterparts, each of
which shall an original and all of which together shall constitute one and the
same agreement.

     13.  HEADINGS. The headings used herein are for convenience only and shall
not affect the construction hereof.

     14.  APPLICABLE LAW. This Agreement shall be governed by and construed in
accordance with the laws of the State of New York applicable to contracts made
and to be performed in the State of New York.

     15.  SEVERABILITY. In the event that any one of more of the provisions
contained herein, or the application thereof in any circumstances, is held
invalid, illegal or unenforceable in any respect for any reason, the validity,
legality and enforceability of any such provision in every other respect and of
the remaining provisions hereof shall not be in any way impaired or affected
thereby, it being intended that all of the rights and privileges of the parties
shall be enforceable to the fullest extent permitted by law.

     16.  SECURITIES HELD BY THE COMPANY, ETC. Whenever the consent or approval
of Holders of a specified percentage of principal amount of Securities or New
Securities is required

                                      -17-
<Page>

hereunder, Securities or New Securities, as applicable, held by the Company or
its Affiliates (other than subsequent Holders of Securities or New Securities if
such subsequent Holders are deemed to be Affiliates solely by reason of their
holdings of such Securities or New Securities) shall not be counted in
determining whether such consent or approval was given by the Holders of such
required percentage.

                            [signature page follows]

                                      -18-
<Page>

     If the foregoing is in accordance with your understanding of our agreement,
please sign and return to us the enclosed duplicate hereof, whereupon this
letter and your acceptance shall represent a binding agreement among the Company
and the several Initial Purchasers.

                                                     Very truly yours,

                                                     COMMONWEALTH EDISON COMPANY

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

The foregoing Agreement is hereby confirmed and
accepted as of the date first above written.

BARCLAYS CAPITAL INC.
FIRST UNION SECURITIES, INC.

By:   Barclays Capital Inc.

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

For themselves and the other
several Initial Purchasers
named in Schedule I to the
Purchase Agreement.

<Page>

                                                                         ANNEX A

     Each Broker-Dealer that receives New Securities for its own account
pursuant to the Exchange Offer must acknowledge that it will deliver a
prospectus in connection with any resale of such New Securities. The Letter of
Transmittal states that by so acknowledging and by delivering a prospectus, a
Broker-Dealer will not be deemed to admit that it is an "underwriter" within the
meaning of the Securities Act. This Prospectus, as it may be amended or
supplemented from time to time, may be used by a Broker-Dealer in connection
with resales of New Securities received in exchange for Securities where such
Securities were acquired by such Broker-Dealer as a result of market-making
activities or other trading activities. The Company has agreed that, starting on
the Expiration Date (as defined herein) and ending on the close of business one
year after the Expiration Date, it will make this Prospectus available to any
Broker-Dealer for use in connection with any such resale. See "Plan of
Distribution".

<Page>

                                                                         ANNEX B

     Each Broker-Dealer that receives New Securities for its own account in
exchange for Securities, where such Securities were acquired by such
Broker-Dealer as a result of market-making activities or other trading
activities, must acknowledge that it will deliver a prospectus in connection
with any resale of such New Securities. See "Plan of Distribution".

<Page>

                                                                         ANNEX C

                              PLAN OF DISTRIBUTION

     Each Broker-Dealer that receives New Securities for its own account
pursuant to the Exchange Offer must acknowledge that it will deliver a
prospectus in connection with any resale of such New Securities. This
Prospectus, as it may be amended or supplemented from time to time, may be used
by a Broker-Dealer in connection with resales of New Securities received in
exchange for Securities where such Securities were acquired as a result of
market-making activities or other trading activities. The Company has agreed
that, starting on the Expiration Date and ending on the close of business one
year after the Expiration Date, it will make this Prospectus, as amended or
supplemented, available to any Broker-Dealer for use in connection with any such
resale. In addition, until __________, 20___, all dealers effecting transactions
in the New Securities may be required to deliver a prospectus.

     The Company will not receive any proceeds from any sale of New Securities
by brokers-dealers. New Securities received by Broker-Dealers for their own
account pursuant to the Exchange Offer may be sold from time to time in one or
more transactions in the over-the-counter market, in negotiated transactions,
through the writing of options on the New Securities or a combination of such
methods of resale, at market prices prevailing at the time of resale, at prices
related to such prevailing market prices or negotiated prices. Any such resale
may be made directly to purchasers or to or through brokers or dealers who may
receive compensation in the form of commissions or concessions from any such
Broker-Dealer and/or the purchasers of any such New Securities. Any
Broker-Dealer that resells New Securities that were received by it for its own
account pursuant to the Exchange Offer and any broker or dealer that
participates in a distribution of such New Securities may be deemed to be an
"underwriter" within the meaning of the Securities Act and any profit of any
such resale of New Securities and any commissions or concessions received by any
such Persons may be deemed to be underwriting compensation under the Securities
Act. The Letter of Transmittal states that by acknowledging that it will deliver
and by delivering a prospectus, a Broker-Dealer will not be deemed to admit that
it is an "underwriter" within the meaning of the Securities Act.

     For a period of one year after the Expiration Date, the Company will
promptly send additional copies of this Prospectus and any amendment or
supplement to this Prospectus to any Broker-Dealer that requests such documents
in the Letter of Transmittal. The Company has agreed to pay all expenses
incident to the Exchange Offer (including the expenses of one counsel for the
holder of the Securities) other than commissions or concessions of any brokers
or dealers and will indemnify the holders of the Securities (including any
Broker-Dealers) against certain liabilities, including liabilities under the
Securities Act.

<Page>

                                                                         ANNEX D

RIDER A

CHECK HERE IF YOU ARE A BROKER-DEALER AND WISH TO RECEIVE 10 ADDITIONAL COPIES
OF THE PROSPECTUS AND 10 COPIES OF ANY AMENDMENTS OR SUPPLEMENTS THERETO.

Name:
          ----------------------------
Address:
          ----------------------------

          ----------------------------

RIDER B

If the undersigned is not a Broker-Dealer, the undersigned represents that it
acquired the New Securities in the ordinary course of its business, it is not
engaged in, and does not intend to engage in, a distribution of New Securities
and it has not arrangements or understandings with any Person to participate in
a distribution of the New Securities. If the undersigned is a Broker-Dealer that
will receive New Securities for its own account in exchange for Securities, it
represents that the Securities to be exchanged for New Securities were acquired
by it as a result of market-making activities or other trading activities and
acknowledges that it will deliver a prospectus in connection with any resale of
such New Securities; however, by so acknowledging and by delivering a
prospectus, the undersigned will not be deemed to admit that it is an
"underwriter" within the meaning of the Securities Act.

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