Southwestern Energy (SWN) DEFA14A Additional proxy soliciting materials

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[B  A  R  C  O  D  E]	MR A SAMPLE DESIGNATION (IF ANY) ADD 1 ADD 2 ADD 3 ADD 4 ADD 5 ADD 6	000000000.000 ext 000000000.000 ext 000000000.000 ext 000000000.000 ext 000000000.000 ext 000000000.000 ext 000000000.000 ext
	[BARCODE]	C    1234567890                J    N    T [BARCODE]
		¨	Mark this box with an X if you have made changes to your name or address details above.

Annual Meeting Proxy Card 123456       C0123456789     12345

PLEASE REFER TO THE REVERSE SIDE FOR TELEPHONE AND INTERNET VOTING INSTRUCTIONS.

This proxy, when properly executed, will be voted in the manner directed herein. If no direction is made, this proxy will be voted in accordance with the recommendation of the Board of Directors,FORthe election of nominees andFORproposals 2, 3 and 4.

 A  Election of Directors

1. The election of six (6) directors to serve until the 2007 Annual Meeting of Shareholders or until their respective successors are duly elected and qualified;

	For	Withhold		For	Withhold		For	Withhold
1 - Lewis E. Epley, Jr.	¨	¨	2 - Robert L. Howard	¨	¨	3 - Harold M. Korell	¨	¨
4 - Vello A. Kuuskraa	¨	¨	5 - Kenneth R. Mourton	¨	¨	6 - Charles E. Scharlau	¨	¨

¨ For, with exercise of cumulative voting privilege. Indicate number of votes cast for each nominee.                                                                             

 B  Proposals

		For	Against	Abstain
2.	The ratification of the appointment of PricewaterhouseCoopers LLP (“PwC”) to serve as the Company’s independent registered public accounting firm for the fiscal year ended December 31, 2006;	¨	¨	¨
3.	The approval of the reincorporation of the Company in the State of Delaware;	¨	¨	¨
4.	The approval of an increase in the number of authorized shares of common stock from 220,000,000 shares to 540,000,000 shares; and	¨	¨	¨
5.	To transact such other business as may properly come before the meeting or any adjournment or adjournments thereof.

 C  Comments

Mark the box to the right with an X if you have made any comments below. ¨

 D  Authorized Signatures - Sign Here - This section must be completed for your instructions to be executed.

Note: Please sign exactly as names appears hereon. Joint owners should each sign. When signing as attorney, executor, trustee, or guardian, please give your full title as such. If a corporation, please sign in full corporate name by president or other authorized officer. If a partnership, please sign in partnership name by an authorized person.

Signature 1 - Please keep signature within the box	Signature 2 - Please keep signature within the box	Date (mm/dd/yyyy)
		/      /

1  U  P  X C  O  Y +

Proxy

SOUTHWESTERN ENERGY COMPANY

2350 N. SAM HOUSTON PARKWAY EAST, SUITE 300

HOUSTON, TEXAS 77032

THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

The undersigned hereby appoints each of Kenneth R. Mourton and Charles E. Scharlau as Proxies, with power of Substitution, and hereby authorizes them to represent and to vote, as designed on the reverse side, all the shares of Common Stock of Southwestern Energy Company held of record by the undersigned on March 24, 2006, at the Annual Meeting of Shareholders to be held on May 25, 2006, or any adjournment or adjournments thereof.

The signer hereby revokes all proxies heretofore given by the signer to vote at said meeting or any adjournments thereof. This proxy is revocable at any time before it is exercised, the signer retaining the right to attend the meeting and vote in person.

Dear Shareholder,

Shareholders of Southwestern Energy Company can take advantage of several services available through our transfer agent, Computershare Trust Company, N.A. These services include:

DirectService Investment Program

Shareholders may purchase or sell Southwestern Energy Company stock directly through the Program rather than dealing with a broker. Automatic investment allows you to purchase additional shares on a regular basis by authorizing Computershare to electronically debit your checking or savings account each month. Shareholders can deposit certificates to be held on account for safekeeping, request a certificate for shares held on account or transfer shares to others.

Vote-by-Internet

Shareholders may vote their shares via the Internet by following the directions on the reverse side of this card. Votes may be cast via Internet up until 11:59 p.m. on the day before the Annual Meeting.

Internet Account Access

Shareholders may access their accounts on-line at www.computershare.com\equiserve. Through Account Access you will have the ability to view your holdings, request address changes, certify tax identification numbers, and buy or sell shares.

Transfer Agent Contact Information

Computershare Trust Company, N.A.	Telephone Inside the USA:	(800) 446-2617
P.O. Box 43069	Telephone Outside the USA:	(781) 575-2723
Providence, RI 02940-3069	TDD/TYY for Hearing Impaired	(800) 952-9245

Telephone and Internet Voting Instructions

You can vote by telephone OR Internet! Available 24 hours a day 7 days a week!

Instead of mailing your proxy, you may choose one of the two voting methods outlined below to vote your proxy.

To vote using the Telephone (within U.S. and Canada)	To vote using the Internet
•   Call toll free 1-800-652-VOTE (8683) in the United States or Canada any time on a touch tone telephone. There isNO CHARGEto you for the call.	•   Go to the following web site:     WWW.COMPUTERSHARE.COM/EXPRESSVOTE
•   Follow the simple instructions provided by the recorded message.	•   Enter the information requested on your computer screen and follow the simple instructions.

If you vote by telephone or the Internet, please DO NOT mail back this proxy card.

Proxies submitted by telephone or the Internet must be received by 11:59 p.m., Local Time, on May 24, 2006.

THANK YOU FOR VOTING