Exhibit 4(f)







                           Form of Guarantee Agreement

                                     between

                       BALTIMORE GAS AND ELECTRIC COMPANY
                                 (as Guarantor)

                                       and

                              The Bank of New York
                        (as Preferred Guarantee Trustee)




                                   Dated as of

                                  __________, 1998








                                TABLE OF CONTENTS

                                                                        Page
                                                                       -------  
ARTICLE I       DEFINITIONS
    SECTION 1.01.  Definitions.............................................2

ARTICLE II      TRUST INDENTURE ACT
    SECTION 2.01.  Trust Indenture Act; Application........................5
    SECTION 2.02.  List of Holders.........................................5
    SECTION 2.03.  Reports by the Preferred Guarantee Trustee..............5
    SECTION 2.04.  Periodic Reports to Preferred Guarantee Trustee.........6
    SECTION 2.05.  Evidence of Compliance with Conditions Precedent........6
    SECTION 2.06.  Events of Default; Waiver...............................6
    SECTION 2.07.  Event of Default; Notice................................7
    SECTION 2.08.  Conflicting Interests...................................7

ARTICLE III     POWERS, DUTIES AND RIGHTS OF THE PREFERRED
                         GUARANTEE TRUSTEE
    SECTION 3.01.  Powers and Duties of the Preferred Guarantee Trustee....7
    SECTION 3.02.  Certain Rights of Preferred Guarantee Trustee..........10

ARTICLE IV      PREFERRED GUARANTEE TRUSTEE
    SECTION 4.01.  Preferred Guarantee Trustee; Eligibility...............12
    SECTION 4.02.  Appointment, Removal and Resignation of the Preferred
                   Guarantee Trustee......................................13

ARTICLE V       GUARANTEE
    SECTION 5.01.  Guarantee..............................................14
    SECTION 5.02.  Waiver of Notice and Demand............................14 
    SECTION 5.03.  Obligations Not Affected...............................14
    SECTION 5.04.  Rights of Holders......................................15
    SECTION 5.05.  Guarantee of Payment...................................16
    SECTION 5.06.  Subrogation............................................16
    SECTION 5.07.  Independent Obligations................................16

ARTICLE VI      SUBORDINATION
    SECTION 6.01.  Ranking................................................17
    SECTION 6.02.  Pari Passu Guarantees..................................17

                                       i





ARTICLE VII     TERMINATION
    SECTION 7.01.  Termination...........................................17



ARTICLE VIII    INDEMNIFICATION
    SECTION 8.01.  Exculpation...........................................17
    SECTION 8.02.  Indemnification.......................................18

ARTICLE IX      MISCELLANEOUS
    SECTION 9.01.  Successors and Assigns................................19
    SECTION 9.02.  Amendments............................................19
    SECTION 9.03.  Notices...............................................19
    SECTION 9.04.  Benefit...............................................20
    SECTION 9.05.  Interpretation........................................20
    SECTION 9.06.  Governing Law.........................................20


                                       ii




                              CROSS-REFERENCE TABLE

Section of                                                        Section of
Trust Indenture Act                                              Guarantee of
1939, as amended                                                  Agreement
- ------------------                                              --------------  
310(a)4.01(a)
310(b)......................................................     4.01(c), 2.08
310(c)......................................................      Inapplicable
311(a)......................................................           2.02(b)
311(b)......................................................           2.02(b)
311(c)......................................................      Inapplicable
312(a)......................................................           2.02(a)
312(b)......................................................           2.02(b)
313.........................................................             2.03
314(a)......................................................             2.04
314(b)......................................................     Inapplicable
314(c)......................................................             2.05
314(d)......................................................     Inapplicable
314(e)......................................................    101,2.05,3.02
314(f)......................................................       2.01, 3.02
315(a)......................................................           3.01(d)
315(b)......................................................             2.07
315(c)......................................................             3.01
315(d)......................................................           3.01(d)
316(a)......................................................   1.01,2.06,5.04
316(b)......................................................             5.03
316(c)......................................................             8.02
317(a)......................................................     Inapplicable
317(b)......................................................     Inapplicable
318(a)......................................................          2.01(b)
318(b)......................................................             2.01
318(c)......................................................          2.01(a)

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

*        This Cross-Reference Table does not constitute part of the Guarantee
         Agreement and shall not affect the interpretation of any of its terms
         or provisions.


                                      iii





                               GUARANTEE AGREEMENT

         This GUARANTEE AGREEMENT (the "Preferred Securities Guarantee"), dated
as of __________, 1998, is executed and delivered by Baltimore Gas and Electric
Company, a Maryland corporation (the "Guarantor"), to The Bank of New York, as
trustee (the "Preferred Guarantee Trustee"), for the benefit of the Holders (as
defined herein) from time to time of the Preferred Securities (as defined
herein) of BGE Capital Trust I, a Delaware statutory business trust (the
"Issuer").

         WHEREAS, pursuant to an Amended and Restated Declaration of Trust (the
"Declaration"), dated as of __________, 1998 among the Trustees named therein,
the Guarantor, as Depositor, and the Holders from time to time of undivided
beneficial interests in the assets of the Issuer, the Issuer is issuing
$___________ aggregate liquidation amount of its ___% Trust Originated Preferred
Securities (liquidation amount of $[ ] per preferred security) (the "Preferred
Securities") representing undivided beneficial interests in the assets of the
Issuer and having the terms set forth in the Declaration;

         WHEREAS, the Preferred Securities will be issued by the Issuer and the
proceeds thereof, together with the proceeds from the sale by the Issuer of its
Common Securities, will be used to purchase the Debentures (as defined in the
Declaration) of the Guarantor which will be deposited with The Bank of New York,
as Property Trustee under the Declaration, as Trust Property (as defined in the
Declaration);

         WHEREAS, as incentive for the Holders to purchase Preferred Securities,
the Guarantor desires irrevocably and unconditionally to agree, to the extent
set forth herein, to pay to the Holders of the Preferred Securities the
Guarantee Payments (as defined herein) and to make certain other payments on the
terms and conditions set forth herein; and

         WHEREAS, the Guarantor is also executing and delivering a guarantee
agreement (the "Common Securities Guarantee") in substantially identical terms
to this Preferred Securities Guarantee for the benefit of the holders of the
Common Securities (as defined herein), except that if an event of default (as
defined in the Indenture) has occurred and is continuing, the Guarantee Payments
under the Common Securities Guarantee are

                                      -1-




         subordinated to the rights of Holders of Preferred Securities to
receive Guarantee Payments under this Preferred Securities Guarantee.

         NOW, THEREFORE, in consideration of the purchase by each Holder of
Preferred Securities, which purchase the Guarantor hereby agrees shall benefit
the Guarantor, the Guarantor executes and delivers this Preferred Securities
Guarantee for the benefit of the Holders from time to time of the Preferred
Securities.


                                    ARTICLE I

                                   DEFINITIONS

         SECTION 1.01. Definitions. As used in this Preferred Securities
Guarantee, each of the terms set forth below shall, unless the context otherwise
requires, have the following meaning. Each capitalized or otherwise defined term
used but not otherwise defined herein shall have the meaning assigned to such
terms in the Declaration as in effect on the date hereof.

         "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person. For the purposes of this definition,
"control" when used with respect to any specified Person means the power to
direct the management and policies of such Person, directly or indirectly,
whether through the ownership of voting securities, by contract or otherwise;
and the terms "controlling" and "controlled" have meanings correlative to the
foregoing.

         "Common Securities" means the common securities representing undivided
beneficial interests in the assets of the Issuer and having the rights provided
therefor in the Declaration.

         "Covered Person" means any Holder or beneficial owner of Preferred
Securities.

         "Event of Default" shall have the meaning specified in Section
2.06(a).

         "Guarantee Payments" means the following payments, without duplication,
with respect to the Preferred Securities, to the extent not paid or made by or
on behalf of the Issuer pursuant to

                                      -2-




the Declaration or by the Guarantor pursuant to the Indenture: (i) any
accumulated and unpaid Distributions required to be paid on the Preferred
Securities, to the extent the Issuer shall have funds available therefor, (ii)
the redemption price (the "Redemption Price") and all accrued and unpaid
Distributions to the date of redemption to the extent the Issuer shall have
funds available therefor, and (iii) upon a voluntary or involuntary dissolution
and liquidation of the Issuer (other than in connection with a Distribution of
Debentures to Holders of such Preferred Securities or the redemption of all such
Preferred Securities), the lesser of (a) the aggregate of the liquidation amount
of $[ ] per Preferred Security plus all accrued and unpaid Distributions on the
Preferred Securities to the date of payment, to the extent the Issuer shall have
funds available therefor and (b) the amount of assets of the Issuer remaining
available for Distribution to Holders of Preferred Securities upon a dissolution
and liquidation of the Issuer (in either case, the "Liquidation Distribution").
If an event of default under the Indenture has occurred and is continuing, the
rights of holders of the Common Securities to receive payments under the Common
Securities Guarantee are subordinated to the rights of Holders of Preferred
Securities to receive Guarantee Payments.

         "Holder" means a Person in whose name a Preferred Security is
registered in the Securities Register; provided, however, that in determining
whether the holders of the requisite percentage of Preferred Securities have
given any request, notice, consent or waiver hereunder, "Holder" shall not
include the Guarantor, the Preferred Guarantee Trustee or any Affiliate of the
Guarantor or the Preferred Guarantee Trustee.

         "Indemnified Person" means the Preferred Guarantee Trustee, any
Affiliate of the Preferred Guarantee Trustee, or any officers, directors,
shareholders, members, partners, employees, representatives, nominees,
custodians or agents of the Preferred Guarantee Trustee.

         "Indenture" means the Indenture dated as of _________, 1998, as amended
or supplemented from time to time, between Baltimore Gas and Electric Company
and The Bank of New York, as trustee thereunder.

         "List of Holders" has the meaning specified in Section 2.02(a).

         "Majority in liquidation amount of the Preferred Securities"


                                       -3-



means, except as provided by the Trust Indenture Act, a vote by the
Holders of more than 50% of the aggregate liquidation amount of all then
outstanding Preferred Securities issued by the Issuer.

         "Officers' Certificate" means a certificate signed by the Chairman, the
Vice Chairman, the President, or any Vice President and the Treasurer, any
Assistant Treasurer, the Secretary or any Assistant Secretary of the Guarantor.

         "Person" means any individual, corporation, partnership, limited
liability company, joint venture, association, joint-stock company, trust,
unincorporated organization, government or any agency or political subdivision
thereof or any other entity.

         "Preferred Guarantee Trustee" means The Bank of New York, until a
Successor Preferred Guarantee Trustee (as defined below) has been appointed and
has accepted such appointment pursuant to the terms of this Preferred Securities
Guarantee and thereafter means each such Successor Preferred Guarantee Trustee.

         "Responsible Officer" means, with respect to the Preferred Guarantee
Trustee, any Vice President, any Assistant Vice President, any Trust Officer or
Assistant Trust Officer or any other officer of the Corporate Trust Department
of the Guarantee Trustee customarily performing functions similar to those
performed by any of the above designated officers and also means, with respect
to a particular corporate trust matter, any other officer to whom such matter is
referred because of that officer's knowledge of and familiarity with the
particular subject.

         "Senior Indebtedness" means Senior Indebtedness as defined in the
Indenture.

         "Successor Preferred Guarantee Trustee" means a successor Preferred
Guarantee Trustee possessing the qualifications to act as Preferred Guarantee
Trustee under Section 4.02.

         "Trust Indenture Act" means the Trust Indenture Act of 1939 as in force
at the date as of which this instrument was executed; provided, however, that in
the event the Trust Indenture Act of 1939 is amended after such date, "Trust
Indenture Act" means, to the extent required by any such amendment, the Trust
Indenture Act of 1939, as so amended.

                                   ARTICLE II


                                      -4-




                               TRUST INDENTURE ACT

         SECTION 2.01.  Trust Indenture Act; Application.

         (a) This Preferred Securities Guarantee is subject to the
provisions of the Trust Indenture Act that are required to be part of this
Preferred Securities Guarantee and shall, to the extent applicable, be governed
by such provisions.

         (b) If, and to the extent that any provision of this Preferred
Securities Guarantee limits, qualifies or conflicts with the duties imposed by
Sections 310 to 317, inclusive, of the Trust Indenture Act, such imposed duties
shall control.

         SECTION 2.02.  List of Holders.

         (a)  The Guarantor shall furnish or cause to be furnished to the
Preferred Guarantee Trustee (i) semiannually, on or before January 15 and July
15 of each year, a list, in such form as the Preferred Guarantee Trustee may
reasonably require, of the names and addresses of the Holders ("List of
Holders") as of a date not more than 15 days prior to the delivery thereof, and
(ii) at such other times as the Preferred Guarantee Trustee may request in
writing, within 30 days after the receipt by the Guarantor of any such request,
a List of Holders as of a date not more than 15 days prior to the time such list
is furnished, in each case to the extent such information is in the possession
or control of the Guarantor and is not identical to a previously supplied List
of Holders or has not otherwise been received by the Preferred Guarantee Trustee
in its capacity as such. The Preferred Guarantee Trustee may destroy any List of
Holders previously given to it on receipt of a new List of Holders.

         (b)  The Preferred Guarantee Trustee shall comply with its
obligations under Sections 311(a), Section 311(b) and Section 312(b) of the
Trust Indenture Act.

         SECTION 2.03. Reports by the Preferred Guarantee Trustee. Within 60
days after May 15 of each year, the Preferred Guarantee Trustee shall provide to
the Holders such reports as are required by Section 313 of the Trust Indenture
Act, if any, in the form and in the manner provided by Section 313 of the Trust
Indenture Act. The Preferred Guarantee Trustee shall also comply with the
requirements of Section 313(d) of the Trust Indenture Act.


                                      -5-



         SECTION 2.04. Periodic Reports to Preferred Guarantee Trustee. The
Guarantor shall provide to the Preferred Guarantee Trustee, the Securities and
Exchange Commission and the Holders such documents, reports and information, if
any, as required by Section 314 of the Trust Indenture Act and the compliance
certificate required by Section 314 of the Trust Indenture Act in the form and
manner and at the times required by Section 314 of the Trust Indenture Act.

         SECTION 2.05. Evidence of Compliance with Conditions Precedent. The
Guarantor shall provide to the Preferred Guarantee Trustee such evidence of
compliance with such conditions precedent, if any, provided for in this
Preferred Securities Guarantee that relate to any of the matters set forth in
Section 314(c) of the Trust Indenture Act. Each Officers' Certificate and
Opinion of Counsel delivered with respect to compliance with a condition or
covenant provided for in this Preferred Securities Guarantee shall include:

                  (a) a statement that each person signing the Officers'
         Certificate or Opinion of Counsel has read the covenant or condition
         and the definition relating thereto;

                  (b) a brief statement of the nature and scope of the
         examination or investigation undertaken and upon which the statements
         contained therein are based;

                  (c) a statement that each such person has made such
         examination or investigation as, in such person's opinion, is necessary
         to enable such person to express an informed opinion as to whether or
         not such covenant or condition has been complied with; and

                  (d) a statement as to whether, in the opinion of each such
         person, such condition or covenant has been complied with.

         SECTION 2.06.  Events of Default; Waiver.

         (a)  An Event of Default means a default by the Guarantor on any of
its payment or other obligations under this Preferred Securities Guarantee;
provided, that except with respect to a default resulting from a failure to pay
any Guarantee Payment, the Guarantor shall have received notice of such default
and shall not have cured such default within 60 days after receipt of such
notice.

                                      -6-





         (b)  The Holders of a Majority in liquidation amount of the
Preferred Securities may, by vote, on behalf of the Holders, waive any past
Event of Default and its consequences. Upon such waiver, any such Event of
Default shall cease to exist, and any Event of Default arising therefrom shall
be deemed to have been cured, for every purpose of this Preferred Securities
Guarantee, but no such waiver shall extend to any subsequent or other default or
Event of Default or impair any right consequent therefrom.

         SECTION 2.07.  Event of Default; Notice.

         (a)  The Preferred Guarantee Trustee shall, within 90 days after
the occurrence of an Event of Default, transmit by mail, first class postage
prepaid, to the Holders, notices of all Events of Default known to the Preferred
Guarantee Trustee, unless such defaults have been cured before the giving of
such notice, provided, that, except in the case of a default in the payment of a
Guarantee Payment, the Preferred Guarantee Trustee shall be protected in
withholding such notice if and so long as the Board of Directors, the executive
committee or a trust committee of directors and/or Responsible Officers of the
Preferred Guarantee Trustee in good faith determines that the withholding of
such notice is in the interests of the Holders.

         (b)  The Preferred Guarantee Trustee shall not be deemed to have
knowledge of any Event of Default unless the Preferred Guarantee Trustee shall
have received written notice, or a Responsible Officer charged with the
administration of the Declaration shall have obtained written notice, of such
Event of Default.

         SECTION 2.08. Conflicting Interests. The Declaration shall be deemed to
be specifically described in this Preferred Securities Guarantee for the
purposes of clause (i) of the first proviso contained in Section 310(b) of the
Trust Indenture Act.

                                   ARTICLE III

                        POWERS, DUTIES AND RIGHTS OF THE
                           PREFERRED GUARANTEE TRUSTEE

         SECTION 3.01.  Powers and Duties of the Preferred Guarantee Trustee.

                                      -7-




         (a)  This Preferred Securities Guarantee shall be held by the
Preferred Guarantee Trustee for the benefit of the Holders, and the Preferred
Guarantee Trustee shall not transfer this Preferred Securities Guarantee to any
Person except a Holder exercising his or her rights pursuant to Section 5.04(iv)
or to a Successor Preferred Guarantee Trustee on acceptance by such Successor
Preferred Guarantee Trustee of its appointment to act as Successor Preferred
Guarantee Trustee. The right, title and interest of the Preferred Guarantee
Trustee shall automatically vest in any Successor Preferred Guarantee Trustee
upon acceptance by such Successor Preferred Guarantee Trustee of its appointment
hereunder and such vesting and cessation of title shall be effective whether or
not conveyancing documents have been executed and delivered pursuant to the
appointment of such Successor Preferred Guarantee Trustee.

         (b)  If an Event of Default has occurred and is continuing, the
Preferred Guarantee Trustee shall enforce this Preferred Securities Guarantee
for the benefit of the Holders.

         (c)  The Preferred Guarantee Trustee, before the occurrence of any
Event of Default and after the curing of all Events of Default that may have
occurred, shall undertake to perform only such duties as are specifically set
forth in this Preferred Securities Guarantee, and no implied covenants shall be
read into this Preferred Securities Guarantee against the Preferred Guarantee
Trustee. In case an Event of Default has occurred and is continuing (and has not
been cured or waived pursuant to Section 2.06), the Preferred Guarantee Trustee
shall exercise such of the rights and powers vested in it by this Preferred
Securities Guarantee, and use the same degree of care and skill in its exercise
thereof, as a prudent person would exercise or use in the conduct of his or her
own affairs.

         (d)  No provision of this Preferred Securities Guarantee shall be
construed to relieve the Preferred Guarantee Trustee from liability for its own
negligent action, its own negligent failure to act or its own willful
misconduct, except that:

                  (i) prior to the occurrence of any Event of Default and after
         the curing or waiving of all such Events of Default that may have
         occurred:

                           (A) the duties and obligations of the Preferred
                  Guarantee Trustee shall be determined solely by the express
                  provisions of this Preferred Securities

                                      -8-




                  Guarantee, and the Preferred Guarantee Trustee shall
                  not be liable except for the performance of such duties and
                  obligations as are specifically set forth in this Preferred
                  Securities Guarantee, and no implied covenants or obligations
                  shall be read into this Preferred Securities Guarantee against
                  the Preferred Guarantee Trustee; and

                           (B) in the absence of bad faith on the part of the
                  Preferred Guarantee Trustee, the Preferred Guarantee Trustee
                  may conclusively rely, as to the truth of the statements and
                  the correctness of the opinions expressed therein, upon any
                  certificates or opinions furnished to the Preferred Guarantee
                  Trustee and conforming to the requirements of this Preferred
                  Securities Guarantee; but in the case of any such certificates
                  or opinions that by any provision hereof or of the Trust
                  Indenture Act are specifically required to be furnished to the
                  Preferred Guarantee Trustee, the Preferred Guarantee Trustee
                  shall be under a duty to examine the same to determine whether
                  or not they conform to the requirements of this Preferred
                  Securities Guarantee;

                  (ii) the Preferred Guarantee Trustee shall not be liable for
         any error of judgment made in good faith by a Responsible Officer of
         the Preferred Guarantee Trustee, unless it shall be proved that the
         Preferred Guarantee Trustee was negligent in ascertaining the pertinent
         facts upon which such judgment was made;

                  (iii) the Preferred Guarantee Trustee shall not be liable with
         respect to any action taken or omitted to be taken by it in good faith
         in accordance with the direction of the Holders of a Majority in
         liquidation amount of the Preferred Securities relating to the time,
         method and place of conducting any proceeding for any remedy available
         to the Preferred Guarantee Trustee, or exercising any trust or power
         conferred upon the Preferred Guarantee Trustee under this Preferred
         Securities Guarantee; and

                  (iv) no provision of this Preferred Securities Guarantee shall
         require the Preferred Guarantee Trustee to expend or risk its own funds
         or otherwise incur personal financial liability in the performance of
         any of its duties or in the exercise of any of its rights or powers, if
         the


                                       -9-



         Preferred Guarantee Trustee shall have reasonable grounds for
         believing that the repayment of such funds or liability is not
         reasonably assured to it under the terms of this Preferred Securities
         Guarantee or reasonable indemnity against such risk or liability is not
         reasonably assured to it.

         SECTION 3.02.  Certain Rights of Preferred Guarantee Trustee.

         (a)  Subject to the provisions of Section 3.01:

                  (i) The Preferred Guarantee Trustee may rely and shall be
         fully protected in acting or refraining from acting upon any
         resolution, certificate, statement, instrument, opinion, report,
         notice, request, direction, consent, order, bond, debenture, note,
         other evidence of indebtedness or other paper or document believed by
         it to be genuine and to have been signed, sent or presented by the
         proper party or parties.

                  (ii) Any direction or act of the Guarantor contemplated by
         this Preferred Securities Guarantee shall be sufficiently evidenced by
         an Officers' Certificate unless otherwise prescribed herein.

                  (iii) Whenever, in the administration of this Preferred
         Securities Guarantee, the Preferred Guarantee Trustee shall deem it
         desirable that a matter be proved or established before taking,
         suffering or omitting to take any action hereunder, the Preferred
         Guarantee Trustee (unless other evidence is herein specifically
         prescribed) may, in the absence of bad faith on its part, request and
         rely upon an Officers' Certificate which, upon receipt of such request
         from the Preferred Guarantee Trustee, shall be promptly delivered by
         the Guarantor.

                  (iv) The Preferred Guarantee Trustee may consult with legal
         counsel, and the written advice or Opinion of Counsel with respect to
         legal matters shall be full and complete authorization and protection
         in respect of any action taken, suffered or omitted to be taken by it
         hereunder in good faith and in accordance with such advice or opinion.
         Such legal counsel may be legal counsel to the Guarantor or any of its
         Affiliates and may be one of its employees. The Preferred Guarantee
         Trustee shall have the right at any time

                                      -10-




         to seek instructions concerning the administration of this
         Preferred Securities Guarantee from any court of competent
         jurisdiction.

                  (v) The Preferred Guarantee Trustee shall be under no
         obligation to exercise any of the rights or powers vested in it by this
         Preferred Securities Guarantee at the request or direction of any
         Holder, unless such Holder shall have provided to the Preferred
         Guarantee Trustee such reasonable indemnity as would satisfy a
         reasonable person in the position of the Preferred Guarantee Trustee,
         against the costs, expenses (including attorneys' fees and expenses)
         and liabilities that might be incurred by it in complying with such
         request or direction; provided that, nothing contained in this Section
         3.02(a)(v) shall be taken to relieve the Preferred Guarantee Trustee,
         upon the occurrence of an Event of Default, of its obligation to
         exercise the rights and powers vested in it by this Preferred
         Securities Guarantee.

                  (vi) The Preferred Guarantee Trustee shall not be bound to
         make any investigation into the facts or matters stated in any
         resolution, certificate, statement, instrument, opinion, report,
         notice, request, direction, consent, order, bond, debenture, note,
         other evidence of indebtedness or other paper or document, but the
         Preferred Guarantee Trustee, in its discretion, may make such further
         inquiry or investigation into such facts or matters as it may see fit.

                  (vii) The Preferred Guarantee Trustee may execute any of the
         trusts or powers hereunder or perform any duties hereunder either
         directly or by or through its agents or attorneys, and the Preferred
         Guarantee Trustee shall not be responsible for any misconduct or
         negligence on the part of any such agent or attorney appointed with due
         care by it hereunder.

                  (viii) Any action taken by the Preferred Guarantee Trustee or
         its agents hereunder shall bind the Holders of the Preferred
         Securities, and the signature of the Preferred Guarantee Trustee or its
         agents alone shall be sufficient and effective to perform any such
         action. No third party shall be required to inquire as to the authority
         of the Preferred Guarantee Trustee to so act or as to its compliance
         with any of the terms and provisions of this Preferred Securities
         Guarantee, both of which shall be conclusively evidenced by the
         Preferred Guarantee Trustee's

                                      -11-




         or its agent's taking such action.

                  (ix) Whenever in the administration of this Preferred
         Securities Guarantee the Preferred Guarantee Trustee shall deem it
         desirable to receive instructions with respect to enforcing any remedy
         or right or taking any other action hereunder, the Preferred Guarantee
         Trustee (A) may request instructions from the Holders, (B) may refrain
         from enforcing such remedy or right or taking such other action until
         such instructions are received, and (C) shall be protected in acting in
         accordance with such instructions.

         (b)  No provision of this Preferred Securities Guarantee shall be
deemed to impose any duty or obligation on the Preferred Guarantee Trustee to
perform any act or acts or exercise any right, power, duty or obligation
conferred or imposed on it in any jurisdiction in which it shall be illegal, or
in which the Preferred Guarantee Trustee shall be unqualified or incompetent in
accordance with applicable law, to perform any such act or acts or to exercise
any such right, power, duty or obligation. No permissive power or authority
available to the Preferred Guarantee Trustee shall be construed to be a duty to
act in accordance with such power and authority.

                                   ARTICLE IV

                           PREFERRED GUARANTEE TRUSTEE

         SECTION 4.01.  Preferred Guarantee Trustee; Eligibility.

         (a)  There shall at all times be a Preferred Guarantee Trustee which
shall:

                  (i) not be an Affiliate of the Guarantor; and

                  (ii) be a Person that is eligible pursuant to the Trust
         Indenture Act to act as such and has a combined capital and surplus of
         at least fifty million U.S. dollars ($50,000,000), and shall be a
         corporation meeting the requirements of Section 310(a) of the Trust
         Indenture Act. If such corporation publishes reports of condition at
         least annually, pursuant to law or to the requirements of the
         supervising or examining authority, then, for the purposes of this
         Section and to the extent permitted by the Trust Indenture Act, the
         combined capital and surplus of such corporation shall be deemed to be
         its combined capital and


                                      -12-



          surplus as set forth in its most recent report of condition so
          published.

         (b)  If at any time the Preferred Guarantee Trustee shall cease to
be eligible to so act under Section 4.01(a), the Preferred Guarantee Trustee
shall immediately resign in the manner and with the effect set out in Section
4.02(c).

         (c)  If the Preferred Guarantee Trustee has or shall acquire any
"conflicting interest" within the meaning of Section 310(b) of the Trust
Indenture Act, the Preferred Guarantee Trustee and Guarantor shall in all
respects comply with the provisions of Section 310(b) of the Trust Indenture
Act. In determining whether the Preferred Guarantee Trustee has a "conflicting
interest" within the meaning of Section 310(b)(1) of the Trust Indenture Act,
the provisions contained in the proviso to Section 310(b)(1) of the Trust
Indenture Act and the Preferred Guarantee Trustee's Statement of Eligibility on
Form T-1 shall be deemed incorporated herein.

         SECTION 4.02.  Appointment, Removal and Resignation of the Preferred
Guarantee Trustee.

         (a)  Subject to Section 4.02(b), the Preferred Guarantee Trustee
may be appointed or removed without cause at any time by the Guarantor.

         (b)  The Preferred Guarantee Trustee shall not be removed until a
new, eligible Preferred Guarantee Trustee has been appointed (a "Successor
Preferred Guarantee Trustee") and has accepted such appointment and assumed the
applicable obligations hereunder by written instrument executed by such
Successor Preferred Guarantee Trustee and delivered to the Guarantor.

         (c)  The Preferred Guarantee Trustee may resign from office
(without need for prior or subsequent accounting) by an instrument in writing
executed by the Preferred Guarantee Trustee and delivered to the Guarantor,
which resignation shall not take effect until a Successor Preferred Guarantee
Trustee has been appointed and has accepted such appointment by instrument in
writing executed by such Successor Preferred Guarantee Trustee and delivered to
the Guarantor and the resigning Preferred Guarantee Trustee.

         (d)  If no Successor Preferred Guarantee Trustee shall have been
appointed and accepted appointment as provided in this

                                      -13-




Section 4.02 within 60 days after delivery to the Guarantor of an
instrument of resignation, the resigning Preferred Guarantee Trustee may
petition, at the expense of the Guarantor, any court of competent jurisdiction
for appointment of a Successor Preferred Guarantee Trustee. Such court may
thereupon, after prescribing such notice, if any, as it may deem proper, appoint
a Successor Preferred Guarantee Trustee.

                                    ARTICLE V

                                    GUARANTEE

         SECTION 5.01. Guarantee. The Guarantor irrevocably and unconditionally
agrees to pay in full to the Holders of the Outstanding Preferred Securities the
Guarantee Payments (without duplication of amounts theretofore paid by or on
behalf of the Issuer pursuant to the Declaration or by the Guarantor pursuant to
the Indenture), as and when due, regardless of any defense, right of set-off or
counterclaim which the Issuer may have or assert. The Guarantor's obligation to
make a Guarantee Payment may be satisfied by direct payment of the required
amounts by the Guarantor to the Holders, at the Guarantor's option or by causing
the Issuer to pay such amounts to the Holders.

         SECTION 5.02. Waiver of Notice and Demand. The Guarantor hereby waives
notice of acceptance of the Preferred Securities Guarantee and of any liability
to which it applies or may apply, presentment, demand for payment, any right to
require a proceeding first against the Preferred Guarantee Trustee, the Issuer
or any other Person before proceeding against the Guarantor, protest, notice of
nonpayment, notice of dishonor, notice of redemption and all other notices and
demands.

         SECTION 5.03. Obligations Not Affected. The obligations, covenants,
agreements and duties of the Guarantor under this Preferred Securities Guarantee
shall in no way be affected or impaired by reason of the happening from time to
time of any of the following:

         (a)  the release or waiver, by operation of law or otherwise, of
the performance or observance by the Issuer of any express or implied agreement,
covenant, term or condition relating to the Preferred Securities to be performed
or observed by the Issuer;

         (b)  the extension of time for the payment by the Issuer of


                                      -14-




all or any portion of the Distributions (other than an extension of
time for payment of Distributions that results from an Extension Period on the
Debentures as so provided in the Indenture), Redemption Price, Liquidation
Distribution or any other sums payable under the terms of the Preferred
Securities or the extension of time for the performance of any other obligation
under, arising out of, or in connection with, the Preferred Securities;

         (c)  any failure, omission, delay or lack of diligence on the part
of the Holders to enforce, assert or exercise any right, privilege, power or
remedy conferred on the Holders pursuant to the terms of the Preferred
Securities, or any action on the part of the Issuer granting indulgence or
extension of any kind;

         (d)  the voluntary or involuntary liquidation, dissolution, sale of
any collateral, receivership, insolvency, bankruptcy, assignment for the benefit
of creditors, reorganization, arrangement, composition or readjustment of debt
of, or other similar proceedings affecting, the Issuer or any of the assets of
the Issuer;

         (e)  any invalidity of, or detect or deficiency in, the Preferred
Securities;

         (f)  the settlement or compromise of any obligation guaranteed hereby
or hereby incurred; or

         (g)  to the extent permitted by law, any other circumstance
whatsoever that might otherwise constitute a legal or equitable discharge or
defense of a guarantor, it being the intent of this Section 5.03 that the
obligations of the Guarantor hereunder shall be absolute and unconditional under
any and all circumstances.

         There shall be no obligation of the Holders to give notice to, or
obtain the consent of, the Guarantor with respect to the happening of any of the
foregoing.

         SECTION 5.04. Rights of Holders. The Guarantor expressly acknowledges
that: (i) this Preferred Securities Guarantee will be deposited with the
Preferred Guarantee Trustee to be held for the benefit of the Holders; (ii) the
Preferred Guarantee Trustee has the right to enforce this Preferred Securities
Guarantee on behalf of the Holders; (iii) the Holders of a Majority in
liquidation amount of the Preferred Securities have the right to

                                      -15-




direct the time, method and place of conducting any proceeding for any
remedy available to the Preferred Guarantee Trustee in respect of this Preferred
Securities Guarantee or exercise or direct the exercise of any trust or power
conferred upon the Preferred Guarantee Trustee under this Preferred Securities
Guarantee; and (iv) any Holder may institute a legal proceeding directly against
the Guarantor to enforce its rights under this Preferred Securities Guarantee,
without first instituting a legal proceeding against the Preferred Guarantee
Trustee, the Issuer or any other Person.

         SECTION 5.05. Guarantee of Payment. This Preferred Securities Guarantee
creates a guarantee of payment and not of collection (i.e., the guaranteed party
may institute a legal proceeding directly against the Guarantor to enforce its
rights under the Preferred Securities Guarantee without first instituting a
legal proceeding against any other person or entity). This Preferred Securities
Guarantee will not be discharged except by payment of the Guarantee Payments in
full to the extent not previously paid or upon Distribution to the Holders of
the Preferred Securities of the corresponding series of Debentures as provided
in the Declaration.

         SECTION 5.06. Subrogation. The Guarantor shall be subrogated to all (if
any) rights of the Holders against the Issuer in respect of any amounts paid to
the Holders by the Guarantor under this Preferred Securities Guarantee and shall
have the right to waive payment by the Issuer pursuant to Section 5.01;
provided, however, that the Guarantor shall not (except to the extent required
by mandatory provisions of law) be entitled to enforce or exercise any rights
which it may acquire by way of subrogation or any indemnity, reimbursement or
other agreement, in all cases as a result of payment under this Preferred
Securities Guarantee, if, at the time of any such payment, any amounts are due
and unpaid under this Preferred Securities Guarantee. If any amount shall be
paid to the Guarantor in violation of the preceding sentence, the Guarantor
agrees to hold such amount in trust for the Holders and to pay over such amount
to the Holders.

         SECTION 5.07. Independent Obligations. The Guarantor acknowledges that
its obligations hereunder are independent of the obligations of the Issuer with
respect to the Preferred Securities and that the Guarantor shall be liable as
principal and as debtor hereunder to make Guarantee Payments pursuant to the
terms of this Preferred Securities Guarantee notwithstanding

                                      -16-




the occurrence of any event referred to in subsections (a) through (g),
inclusive, of Section 5.03 hereof.

                                   ARTICLE VI

                                  SUBORDINATION

         SECTION 6.01. Ranking. This Preferred Securities Guarantee shall
constitute an unsecured obligation of the Guarantor and shall rank (a)
subordinate and junior in right of payment to all general liabilities of the
Guarantor, (b) pari passu with the senior most preferred stock now or hereafter
issued by the Guarantor and with any guarantee now or hereafter issued by the
Guarantor in respect of preferred stock of any affiliate of the Guarantor and
(c) senior to the Guarantor's common stock.

         SECTION 6.02. Pari Passu Guarantees. This Preferred Securities
Guarantee shall rank pari passu with any similar Preferred Securities Guarantees
issued by the Guarantor on behalf of the holders of trust preferred securities
issued by other BGE Trusts.

                                   ARTICLE VII

                                   TERMINATION

         SECTION 7.01. Termination. This Preferred Securities Guarantee shall
terminate and be of no further force and effect upon full payment of the
Redemption Price or Liquidation Distribution for the Preferred Securities or
upon Distribution of the Debentures to the Holders of the Preferred Securities.
This Preferred Securities Guarantee will continue to be effective or will be
reinstated, as the case may be, if at any time any Holder of the Preferred
Securities must restore payment of any sums paid under the Preferred Securities
or this Preferred Securities Guarantee.

                                  ARTICLE VIII

                                 INDEMNIFICATION

         SECTION 8.01.  Exculpation.

         (a)  No Indemnified Person shall be liable, responsible or
accountable in damages or otherwise to the Guarantor or any Covered Person for
any loss, damage or claim incurred by reason

                                      -17-




of any act or omission performed or omitted by such Indemnified Person
in good faith in accordance with this Preferred Securities Guarantee and in a
manner that such Indemnified Person reasonably believed to be within the scope
of the authority conferred on such Indemnified Person by this Preferred
Securities Guarantee or by law, except that an Indemnified Person shall be
liable for any such loss, damage or claim incurred by reason of such Indemnified
Person's negligence or willful misconduct with respect to such acts or
omissions.

         (b)  An Indemnified Person shall be fully protected in relying in
good faith upon the records of the Guarantor and upon such information,
opinions, reports or statements presented to the Guarantor by any Person as to
matters the Indemnified Person reasonably believes are within such other
Person's professional or expert competence and who has been selected with
reasonable care by or on behalf of the Guarantor, including information,
opinions, reports or statements as to the value and amount of the assets,
liabilities, profits, losses, or any other facts pertinent to the existence and
amount of assets from which Distributions to Holders of Preferred Securities
might properly be paid.

         SECTION 8.02.  Indemnification.

         (a)  To the fullest extent permitted by applicable law, the
Guarantor shall indemnify and hold harmless each Indemnified Person from and
against any loss, damage or claim incurred by such Indemnified Person by reason
of any act or omission performed or omitted by such Indemnified Person in good
faith in accordance with this Preferred Securities Guarantee and in a manner
such Indemnified Person reasonably believed to be within the scope of authority
conferred on such Indemnified Person by this Preferred Securities Guarantee,
except that no Indemnified Person shall be entitled to be indemnified in respect
of any loss, damage or claim incurred by such Indemnified Person by reason of
negligence or willful misconduct with respect to such acts or omissions.

         (b)  To the fullest extent permitted by applicable law, reasonable
expenses (including legal fees) incurred by an Indemnified Person in defending
any claim, demand, action, suit or proceeding shall, from time to time, be
advanced by the Guarantor prior to the final disposition of such claim, demand,
action, suit or proceeding upon receipt by the Guarantor of an undertaking by or
on behalf of the Indemnified Person to repay

                                      -18-




such amount if it shall be determined that the Indemnified Person is
not entitled to be indemnified as authorized in Section 8.02(a).

         (c)  The obligation to indemnify as set forth in this Section 8.02
shall survive the termination of the Preferred Securities Guarantee.

                                   ARTICLE IX

                                  MISCELLANEOUS

         SECTION 9.01. Successors and Assigns. All guarantees and agreements
contained in this Preferred Securities Guarantee shall bind the successors,
assigns, receivers, trustees and representatives of the Guarantor and shall
inure to the benefit of the Holders of the Preferred Securities then
outstanding. The Guarantor may not consolidate with or merge with or into, or
sell, convey, transfer or lease its properties and assets as an entirety or
substantially as an entirety (either in one transaction or a series of
transactions) to, any Person unless permitted under Article Eight of the
Indenture. In connection with a consolidation, merger or sale involving the
Guarantor that is permitted under Article Eight of the Indenture the Person
formed by or surviving such consolidation or merger or to which such sale,
conveyance, transfer or lease shall have been made, if other than the Guarantor,
shall expressly assume all of the obligations of the Guarantor hereunder and
under the Declaration.

         SECTION 9.02. Amendments. Except with respect to any changes which do
not adversely affect the rights of the Holders in any material respect (in which
case no consent of the Holders will be required), this Preferred Securities
Guarantee may only be amended with the prior approval of the Holders of a
Majority in liquidation amount of the Preferred Securities (excluding any
Preferred Securities held by the Guarantor or an Affiliate thereof). The
provisions of Article VI of the Declaration concerning meetings of the Holders
shall apply to the giving of such approval.

         SECTION 9.03. Notices. Any notice, request or other communication
required or permitted to be given hereunder shall be in writing and delivered,
telecopied or mailed by first class mail, postage prepaid, as follows:

                  (a) if given to the Guarantor, to the address set

                                      -19-




         forth below or such other address as the Guarantor may give notice of
         to the Holders:

                  Baltimore Gas and Electric Company
                  39 W. Lexington Street
                  Baltimore, Maryland 21201
                  Facsimile No: (410) 234-5367
                  Attention:  Treasurer

                  (b) if given to the Issuer, in care of the Preferred Guarantee
         Trustee, at the Issuer's (and the Preferred Guarantee Trustee's)
         address set forth below or such other address as the Preferred
         Guarantee Trustee on behalf of the Issuer may give notice to the
         Holders:

                  BGE Capital Trust I
                  c/o Baltimore Gas and Electric Company
                  39 W. Lexington Street
                  Baltimore, Maryland 21201
                  Facsimile No:  (410) 234-5367
                  Attention:  Treasurer

         with a copy to:

                  The Bank of New York
                  101 Barclay Street, 21st Floor
                  New York, NY 10286
                  Facsimile No:
                  Attention:

                  (c) if given to any Holder, at the address set forth in the
        Securities Register.

         All notices hereunder shall be deemed to have been given when received
in person, telecopied with receipt confirmed, or mailed by certified mail,
postage prepaid except that if a notice or other document is refused delivery or
cannot be delivered because of a changed address of which no notice was given,
such notice or other document shall be deemed to have been delivered on the date
of such refusal or inability to deliver.

         SECTION 9.04.  Benefit.  This Preferred Securities Guarantee is solely
for the benefit of the Holders and is not separately transferable from the
Preferred Securities.

         SECTION 9.05.  Interpretation.  In this Preferred Securities

                                      -20-




         Guarantee, unless the context otherwise requires:

                  (a) all references to "the Preferred Securities Guarantee" or
         "this Preferred Securities Guarantee" are to this Preferred Securities
         Guarantee as modified, supplemented or amended from time to time;

                  (b) all references in this Preferred Securities Guarantee to
         Articles and Sections are to Articles and Sections of this Preferred
         Securities Guarantee unless otherwise specified;

                  (c) a term defined in the Trust Indenture Act has the same
         meaning when used in this Preferred Securities Guarantee unless
         otherwise defined in this Preferred Securities Guarantee or unless the
         context otherwise requires;

                  (d) a reference to the singular includes the plural and vice
         versa; and

                  (e) the masculine, feminine or neuter genders used herein
         shall include the masculine, feminine and neuter genders.

         SECTION 9.06. Governing Law. THIS PREFERRED SECURITIES GUARANTEE SHALL
BE GOVERNED BY AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH THE LAWS OF THE
STATE OF NEW YORK AS APPLIED TO CONTRACTS MADE AND PERFORMED WITHIN THE STATE OF
NEW YORK WITHOUT REGARD TO THE CONFLICT OF LAW PRINCIPLES THEREOF.

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

         THIS PREFERRED SECURITIES GUARANTEE is executed as of the day and year
first above written.

                                     BALTIMORE GAS AND ELECTRIC COMPANY,
                                         as Guarantor

                                     By:________________________________
                                     Name:
                                     Title:


                                      -21-




                                      THE BANK OF NEW YORK,
                                          as Preferred Guarantee Trustee

                                      By:________________________________
                                      Name:
                                      Title:



                                      -22-