8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): September 20, 2005

SOUTHWESTERN ENERGY COMPANY

(Exact name of registrant as specified in its charter)

Arkansas

(State or other jurisdiction of incorporation)

1-8246	71-0205415
(Commission File Number)	(IRS Employer Identification No.)

2350 N. Sam Houston Pkwy. E., Suite 300, Houston, Texas	77032
(Address of principal executive offices)	(Zip Code)

(281) 618-4700

(Registrant's telephone number, including area code)

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

       o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

SECTION 8.  Other Events.

Item 8.01 Other Events.

On September 20, 2005 Southwestern Energy Company issued a press release announcing the closing of the Company's common stock offering and over-allotment option.  This press release is being filed as Exhibit 99.1.

SECTION 9.  Financial Statements and Exhibits.

(c) Exhibits.

99.1 Press release dated September 20, 2005 announcing the closing of the Company's common stock offering and over-allotment option.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	SOUTHWESTERN ENERGY COMPANY
Dated: September 20, 2005	By:	/s/    GREG D. KERLEY
	Name:	Greg D. Kerley
	Title:	Executive Vice President and
		Chief Financial Officer

EXHIBIT INDEX

Exhibit Number	Description
99.1	Press release dated September 20, 2005 announcing the closing of the Company's common stock offering and over-allotment option.

EX-99

2350 N. Sam Houston Parkway East Suite 300 Houston, Texas  77032 (281) 618-4700     Fax: (281) 618-4820

NEWS RELEASE

SOUTHWESTERN ENERGY ANNOUNCES CLOSING OF COMMON STOCK

 OFFERING AND OVER-ALLOTMENT OPTION

Houston, Texas – September 20, 2005...Southwestern Energy Company (NYSE: SWN) announced today the closing of its public offering of 8,500,000 shares of common stock, which also included the closing of the previously exercised over-allotment option for an additional 1,275,000 shares by the underwriters. The net proceeds from the sale of the 9,775,000 shares totaled approximately $580.2 million, excluding expenses, and will be used to fund the recently announced increases in the company’s 2005 capital program, to repay upon maturity $125 million of the company’s senior notes due in December 2005 and to fund future capital expenditures relating to the acceleration of the development of the company’s Fayetteville Shale play in Arkansas.

Southwestern Energy Company is an integrated natural gas company whose wholly-owned subsidiaries are engaged in oil and gas 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.

Contacts:	Greg D. Kerley	Brad D. Sylvester, CFA
	Executive Vice President	Manager, Investor Relations
	and Chief Financial Officer	(281) 618-4897
	(281) 618-4803

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