Exhibit 5


Donna M. Levy
Seionr Counsel

                                                Constellation Energy Group, Inc.
                                                             250 W. Pratt Street
                                                                      23rd Floor

                                                  Baltimore, Maryland 21201-2437
                                                                    410-783-3623


 [Company Logo]



                                        September 29, 2000



Constellation Energy Group, Inc.
250 West Pratt Street
Baltimore, MD 21201

Ladies and Gentlemen:

         I am a Senior Counsel for Constellation  Energy Group, Inc., a Maryland
corporation (the  "Company"),  and am furnishing this opinion in connection with
the Company's  registration  statement on Form S-8 filed on the date hereof (the
"Registration  Statement")  to register  under the  Securities  Act of 1933,  as
amended,  2 million  shares (the "Shares") of common stock (no par value) of the
Company (the "Common Stock"), to be granted pursuant to the Constellation Energy
Group, Inc. Management Long-Term Incentive Plan (the "Plan").

         In connection  with this opinion,  I have  considered  such records and
documents,  and made such examinations of law as I have deemed relevant. I am of
the opinion that the Shares,  when issued and delivered in the manner and on the
terms contemplated in the Registration  Statement and the Plan (with the Company
having received the consideration  therefor,  the form of which is in accordance
with applicable law), will be validly issued, fully paid and non-assessable.

         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 letter as an exhibit to
the Registration  Statement. 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.

                                           Sincerely yours,

                                           /s/ Donnan M. Levy