Exhibit 5


September 29, 2000



Baltimore Gas and Electric Company
39 W. Lexington Street
Baltimore, Maryland  21201

Gentlemen:

         This opinion is provided in connection with the Registration  Statement
(the "Registration Statement") being filed by Baltimore Gas and Electric Company
("BGE") with the Securities  and Exchange  Commission  ("Commission")  under the
Securities  Act of 1933, as amended,  regarding  the proposed  issuance of up to
$150,000,000 principal amount Medium Term Notes, Series I (the "Notes").

         I am a Senior Counsel of Constellation  Energy Group,  Inc., the parent
of BGE and head of the  Corporate  Unit in  Constellation  Energy  Group's Legal
Department.  I am generally familiar with BGE's corporate  history,  properties,
operations,   Charter  (including  amendments,   supplements,  and  restatements
thereto), the issuance of its securities  outstanding,  and the indentures under
which its debt is issued.  In connection with this opinion,  I have  considered,
among  other  things (1) the  Charter of BGE;  (2) the  By-Laws of BGE;  (3) the
Indenture dated as of July 1, 1985, from the Company to The Bank of New York, as
successor Trustee, as amended by Supplemental  Indentures dated as of October 1,
1987 and  January  26,  1993 (the  "Indenture")  under  which the Notes  will be
issued; (4) the corporate  proceedings for the approval of the issuance and sale
of  the  Notes;  (5)  the  Registration  Statement;  (6)  the  agency  agreement
(including  the  standard   purchase   provisions)  filed  as  exhibits  to  the
Registration Statement (the "purchase agreement"); and (7) such other documents,
transactions,  and matters of law as I deemed  necessary in order to render this
opinion.

         This  opinion is subject to (1) the proper  execution,  authentication,
and  delivery of the Notes upon receipt of the  purchase  price  pursuant to the
purchase  agreement;  (2) the  qualification  of the  Indenture  under the Trust
Indenture Act of 1939, and (3) the  Registration  Statement  becoming  effective
under the Securities Act of 1933, as amended.




Baltimore Gas and Electric Company
September 29, 2000
Page 2




         Based on the foregoing, I am of the opinion that the Notes, when issued
and delivered pursuant to the purchase agreement, will constitute legally issued
and binding obligations of BGE.

         I express no opinion as to the law of any  jurisdiction  other than the
law of the State of Maryland  and the law of the United  States of America.  The
opinion  expressed  herein  concerns only the effect of the law  (excluding  the
principles  of conflicts of law) of the State of Maryland and the United  States
of America as currently in effect.

         This opinion is provided  solely for your benefit and may not be relied
upon by, or quoted to, any other person or entity, in whole or in part,  without
my prior written consent.

         I hereby  consent  to the  filing of this  opinion as an exhibit to the
Registration Statement and to the references to me in the Registration Statement
(and  any  amendments  thereto)  or the  prospectus  constituting  a part of the
Registration  Statement (and any amendments or supplements  thereto).  In giving
this consent, I do not thereby admit that I am an "expert" within the meaning of
the Securities Act of 1933, as amended.

                                                              Very truly yours,



                                                              /s/ Donna M. Levy