CLEARLY, GOTTLIEB, STEEN & HAMILTON
                               ONE LIBERTY PLAZA
                               NEW YORK, NY 10006







December 5, 1995




Southwestern Energy Company
1083 Sain Street
Fayetteville, Arkansas 72703

Ladies and Gentlemen:

                  We have  acted as  special  counsel  for  Southwestern  Energy
Company,  an  Arkansas  corporation  (the  "Company"),  in  connection  with the
preparation  and filing with the  Securities and Exchange  Commission  under the
Securities  Act of 1933, as amended (the  "Securities  Act"),  of a Registration
Statement on Form S-3 (No. 33-63895)(as amended when it became  effective,  the
"Registration  Statement")  and the related  prospectus (the  "Prospectus"),  as
supplemented  by  the  prospectus   supplement  dated  November  30,  1995  (the
"Prospectus  Supplement"),  relating  to the  offering  from time to time of the
Company's debt securities up to an aggregate initial public offering or purchase
price of U.S. $250,000,000 in accordance with Rule 415 under the Securities Act,
and the offering of  $125,000,000  aggregate  principal  amount of the Company's
6.70% Senior Notes (the "Notes"),  represented by a global security (the "Global
Security"),  to be issued under an  indenture  dated as of December 1, 1995 (the
"Indenture")  between  the Company and The First  National  Bank of Chicago,  as
trustee (the "Trustee").



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Southwestern Energy Company, p.2

         We have participated in the preparation of the Registration  Statement,
the Prospectus, the Prospectus Supplement, the Indenture and the Global Security
and we have reviewed the originals or copies  certified or otherwise  identified
to our satisfaction of all such corporate  records of the Company and such other
instruments   and  other   certificates  of  public   officials,   officers  and
representatives  of the  Company and such other  persons,  and we have made such
investigations of law, as we have deemed appropriate as a basis for the opinions
expressed below. In rendering the opinions  expressed below, we have assumed the
authenticity of all documents submitted to us as originals and the conformity to
the originals of all documents  submitted to us as copies. In addition,  we have
assumed but not verified the accuracy as to factual  matters of each document we
have reviewed.

         Based on the foregoing, it is our opinion that:

         1. The  indenture has been duly  authorized by all necessary  corporate
action of the Company and has been duly  executed  and  delivered by the Company
under the law of the State of New York,  and,  assuming  the due  authorization,
execution and delivery of the  Indenture by the Trustee,  as to which no opinion
is expressed, the Indenture is a legal, valid, binding and enforceable agreement
of the Company.

         2. The  execution  and  delivery  by the Company of the Notes have been
duly authorized by all necessary  corporate  action of the Company in accordance
with the  provisions  of the  Indenture  and the Global  Security  has been duly
executed and  delivered  by the Company  under the law of the State of New York,
and when the Global Security is authenticated by the Trustee, and the Notes have
been sold as described in the  Registration  Statement,  the  Prospectus and the
Prospectus  Supplement  relating to the Notes, such Notes will constitute legal,
valid, binding and enforceable obligations of the Company.

         Insofar as the foregoing  opinions  relate to the  legality,  validity,
binding effect or  enforceability of any agreement or obligation of the Company,
(a) we have assumed  that the Company and each other party to such  agreement or
obligation has satisfied those legal  requirements  that are applicable to it to
the extent necessary to make such agreement or obligation enforceable against it
(except that no such assumption is made as to the Company  regarding  matters of
the federal law of the United States of America (other than matters  relating to
federal  energy law) or the law of the State of New York) and (b) such  opinions
are subject to  applicable  bankruptcy,  insolvency  and similar laws  affecting
creditors'  rights  generally  and to  general  principles  of  equity  (whether
considered in a proceeding in equity or at law).





                                      -4-




Southwestern Energy Company, p. 3

                  We express no opinion  other than as to the federal law of the
United  States of America and the law of the State of New York.  With respect to
all matters of the law of the State of Arkansas and federal  energy law, we have
relied on the opinion of Jeffrey L. Dangeau, Assistant Secretary to the Company,
a copy of which is attached hereto.

Very truly yours,

CLEARY, GOTTLIEB, STEEN & HAMILTON



By       STEPHEN H. SHALEN
    ---------------------------- 
    Stephen H. Shalen, a Partner


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