Baltimore Gas and Electric Company
                                            P. O. Box 1475
                                            Baltimore, Maryland 21203
                                            410 234-5314  FAX 410 234-5690



Constance F. Smith
Associate General Counsel
Legal
                                                       Exhibit 5(a)

May 26, 1998



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,  among other  things:  (i) the
proposed issuance of junior subordinated debentures (the "Notes") by the Company
to be issued in  accordance  with the  provisions  of an indenture to be entered
into between BGE and The Bank of New York, as trustee, and to be supplemented by
a first supplemental indenture thereto, the forms of which are filed as exhibits
to the  Registration  Statement  (collectively,  the  "Indenture")  and (ii) the
proposed execution and delivery of a preferred securities guarantee agreement to
be entered  into between BGE and The Bank of New York,  as trustee,  the form of
which is filed as an exhibit to the Registration Statement (the "Guarantee").

         I am an Associate General Counsel of BGE and head of the Corporate Unit
in its 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,  the
General  Counsel  of BGE and I,  together  with  attorneys  we  supervise,  have
considered,  among other  things (1) the Charter of BGE; (2) the By-Laws of BGE;
(3) the  Indenture  under  which the Notes  will be  issued;  (4) the  corporate
proceedings  for the  approval  of the  issuance  and sale of the  Notes and the
execution and delivery of the Guarantee; (5) the Registration Statement; (6) the
Guarantee; (7) the provisions of the Public Utility Holding Company Act of 1935,
as amended  (the "1935  Act"),  together  with an order dated  January 16, 1956,
issued by the Commission (File No. 31-631)  exempting BGE from the provisions of
the  1935  Act  applicable  to it as a  holding  company;  and  (8)  such  other
documents,  transactions,  and matters of law as we deemed necessary in order to
render this opinion.







Baltimore Gas and Electric Company
May 26, 1998
Page 2

         This  opinion is subject to (1) the proper  execution,  authentication,
and  delivery  of  the  Notes  upon  receipt  of the  purchase  price;  (2)  the
qualification  of the Indenture and the Guarantee  under the Trust Indenture Act
of 1939, as amended; (3) the Registration Statement becoming effective under the
Securities  Act of 1933, as amended;  and (4) the approval of the Public Service
Commission  of  Maryland  for the  issuance of the Notes and the  execution  and
delivery of the Guarantee by BGE.

         Based on the foregoing, I am of the opinion that:

         (1) The Notes,  when issued and  delivered  pursuant to the  Indenture,
will  constitute  legally  issued and binding  obligations  of BGE,  enforceable
against BGE in accordance with their terms, except as enforcement may be limited
by (i) bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium
and similar  laws or  equitable  principles  relating to or limiting  creditors'
rights and remedies generally, and (ii) the application of general principles of
equity.

         (2) The Guarantee when executed and delivered by BGE, will constitute a
legally binding  obligation of BGE,  enforceable  against BGE in accordance with
its terms except as enforcement  may be limited by (i)  bankruptcy,  insolvency,
fraudulent conveyance, reorganization,  moratorium and similar laws or equitable
principles relating to or limiting creditors rights and remedies generally,  and
(ii) the application of general principles of equity.

         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).

                                                     Very truly yours,

                                                     /s/ Constance F. Smith