1083 Sain Street
                                             P.O. Box 1408
                                             Fayetteville, AR  72702-1408
                                             (501) 521-1141  FAX: (501) 521-0328


NEWS RELEASE                                 For Further Information Contact:
                                             Greg D. Kerley
                                             Executive Vice President
                                             and Chief Financial Officer
                                             (501) 521-1141



              SOUTHWESTERN ENERGY ANNOUNCES 2000 YEAR-END RESERVES

                 Company Replaces 196 Percent of Production at
                         Finding Cost of $0.99 Per Mcfe

         Fayetteville, Arkansas - February 1, 2001...Southwestern Energy Company
(NYSE:  SWN) today  announced  that it added 70.1 billion cubic feet  equivalent
(Bcfe) of oil and gas reserves in 2000,  replacing 196 percent of its production
during the year, at a finding and development  cost of $0.99 per Mcf equivalent.
Oil and gas  production  for 2000 totaled 35.7 Bcfe,  up over 8 percent from the
level in 1999. After 35.7 Bcfe of production,  net upward revisions of 5.2 Bcfe,
and  dispositions  of 13.8 Bcfe,  the  Company's oil and gas reserves were 380.5
Bcfe at  December  31,  2000,  up 7 percent  from 354.7 Bcfe at the end of 1999.
Natural gas comprised 87 percent of the Company's proved equivalent  reserves at
the end of 2000,  and 82 percent of the Company's  reserves  were  classified as
proved, developed.
         "The year 2000 has been one of the best  years  operationally  that the
Company has ever had, with our strong results produced  primarily from drilling.
The consistent  improvement in our drilling results over the past three years is
solid  evidence that our E&P strategy we set in place in 1998 is adding  value,"
stated Harold M. Korell,  President and Chief Executive  Officer of Southwestern
Energy. "We expect 2001 to be another exceptional year."
         Southwestern  Energy Company is an integrated natural gas company whose
wholly-owned subsidiaries are engaged in gas and oil exploration and production,
natural  gas   gathering,   transmission,   and   marketing,   and  natural  gas
distribution. Additional information on the Company can be found on the Internet
at http://www.swn.com.
         All  statements,  other than  historical  financial  information may be
deemed to be forward-looking statements within the meaning of Section 27A of the
Securities Act of 1933, as


amended,  and Section 21E of the  Securities  Exchange Act of 1934,  as amended.
Although the Company believes the expectations expressed in such forward-looking
statements  are  based  on  reasonable  assumptions,  such  statements  are  not
guarantees of future  performance and actual results or developments  may differ
materially from those in the forward-looking statements.  Important factors that
could   cause   actual   results  to  differ   materially   from  those  in  the
forward-looking  statements  herein include,  but are not limited to, the timing
and extent of changes in commodity prices for gas and oil, the timing and extent
of the Company's success in discovering,  developing,  producing, and estimating
reserves,  property  acquisition or divestiture  activities that may occur,  the
effects of weather and regulation on the Company's gas distribution segment, the
value that the Company's gas  distribution  segment may bring in exploring sales
opportunities  for this  segment,  increased  competition,  legal  and  economic
factors, governmental regulation, the financial impact of accounting regulations
for derivative instruments,  changing market conditions, the comparative cost of
alternative fuels,  conditions in capital markets and changes in interest rates,
availability of oil field services,  drilling rigs, and other equipment, as well
as various other factors beyond the Company's control. A discussion of these and
other factors  affecting the Company's  performance is included in the Company's
periodic reports filed with the Securities and Exchange Commission including its
Annual Report on Form 10-K for the year ended December 31, 1999.

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