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                                   Exhibit 5.1

                                                         Legal Department
                                                         250 West Pratt Street
                                                         23rd Floor
                                                         Baltimore, MD 21201
                                                         410-783-3082
                                                         410-783-3079 Fax

January 23, 2002

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

Ladies and Gentlemen:

     I am a 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") and plan interest,  to be issued  pursuant to the  Constellation  Energy
Group,  Inc.  Employee  Savings Plan, the Represented  Employee Savings Plan for
Nine Mile  Point and the  Non-Represented  Employee  Savings  Plan for Nine Mile
Point (the "Plans").

     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 any original  issued  Shares,  when issued and delivered in the
manner  and on the terms  contemplated  in the  Registration  Statement  and the
Plans, 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/  Sally Samuel
                                                     Sally Samuel