Exhibit 5(b)

                                 PIPER & MARBURY
                                     L.L.P.
                          1200 NINETEENTH STREET, N.W.
                           Washington, D.C. 20036-2430
                                  202-861-3900
                               FAX: 202-223-2085                 BALTIMORE
                                                                  NEW YORK
                                                                PHILADELPHIA
                                                                   EASTON


                          April 3, 1997


Constellation Energy Corporation
c/o David A. Brune
Baltimore Gas and Electric Company
39 West Lexington Street
Baltimore, Maryland  2l201

             Re:  Registration Statement on Form S-3
                  ----------------------------------

Dear Sirs:

     We   have   acted   as   counsel  to  Constellation   Energy
Corporation, (the "Company"), in connection with the registration
under  the Securities Act of 1933, as amended (the "Act")  of  10
million  shares of the Company's Common Stock, no par value  (the
"Common Shares").  The Common Shares will be issued in connection
with  and  pursuant  to  the Company's Common  Stock  Shareholder
Investment  Plan  (the  "Plan).   The  Common  Shares  are  being
registered   on   Registration  Statement  on   Form   S-3   (the
"Registration  Statement") to be filed by the  Company  with  the
Securities and Exchange Commission (the "Commission").  The  Plan
is filed as part of the Registration Statement.

     We have reviewed the Company's Amended and Restated Articles
of  Incorporation  (the  "Charter"), and its  by-laws  (the  "By-
Laws"),  which we have been advised will be effective as  of  the
effective  time  of the merger among Baltimore Gas  and  Electric
Company, Potomac Electric Power Company and the Company.  We have
reviewed  the  Registration  Statement  and  the  Plan  and  have
examined  and relied upon such corporate records of  the  Company
and other documents and certificates as to factual matters as  we
have deemed necessary or appropriate for the purpose of rendering
the   opinion   expressed  herein.   We  have  assumed,   without
independent  verification, the genuineness of the  signatures  on
and  the  authenticity of all documents furnished to  us  by  the
Company.

     Based  upon the foregoing, we are of the opinion and  advise
you  that  the Common Shares have been duly authorized and,  when
issued   and  paid  for  pursuant  to  the  Plan  in  the  manner




Constellation Energy Corporation
April 3, 1997
Page 2

contemplated  by  the  Registration  Statement,  will  have  been
validly  and  legally  issued and will be  fully  paid  and  non-
assessable.

     The opinion expressed herein concerns only the effect of the
law  (excluding  the  principles of  conflicts  of  law)  of  the
Commonwealth of Virginia and the United States of America.

     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 our prior written consent except  that
Donna M. Levy may rely upon this opinion in rendering her opinion
to you dated today regarding the Common Shares.

     We  hereby  consent to the filing of this opinion  with  the
Securities  and  Exchange  Commission  as  an  Exhibit   to   the
Registration  Statement and to the use  of  our  name  under  the
caption  "Legal  Matters" in the Prospectus  and  any  amendments
thereto.

                                   Very truly yours,

                                  /s/ PIPER & MARBURY L.L.P.