WES
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Western Gas Partners, LP Prices Initial Public Offering

HOUSTON, May 8, 2008 – Western Gas Partners, LP (NYSE: WES) today announced that it has priced its initial public offering of 18,750,000 common units representing limited partner interests at $16.50 per common unit. The underwriters have been granted a 30-day option to purchase up to an additional 2,812,500 common units. The common units will begin trading on Friday, May 9, 2008, on the New York Stock Exchange under the symbol “WES.” The offering is expected to close on or about May 14, 2008.

Upon conclusion of the offering, the public will own an approximate 35% limited partner interest in Western Gas Partners, or an approximate 40% limited partner interest if the underwriters exercise in full their option to purchase additional common units. Anadarko Petroleum Corporation (NYSE: APC) will own the remaining equity interests in Western Gas Partners, including the general partner interest.

UBS Investment Bank, Citi, Credit Suisse and Morgan Stanley acted as joint book-running managers of the offering. Banc of America Securities LLC, Goldman, Sachs & Co., JPMorgan, Lehman Brothers and Wachovia Securities acted as senior co-managers, and Scotia Capital, Bear, Stearns & Co. Inc., Friedman Billings

Ramsey and Stifel Nicolaus acted as co-managers, for the offering.

A copy of the final prospectus relating to the offering may be obtained from the offices of: (i) UBS Securities LLC, Prospectus Department, 299 Park Avenue, New York, New York 10171, phone: 888-827-7275 or 212-713-2626; (ii) Citigroup Global Markets Inc., Brooklyn Army Terminal, Attn: Prospectus Delivery Department, 140 58th Street, Brooklyn, New York 11220, phone: 800-831-9146; (iii) Credit Suisse Securities (USA) LLC, Attn: Prospectus Department, One Madison Avenue, New York, New York 10010, phone: 800-221-1037; or (iv) Morgan Stanley & Co. Incorporated, Attn: Prospectus Department, 180 Varick Street, 2nd Floor, New York, New York 10014, e-mail: [email protected]

 

A registration statement relating to these securities has been filed with, and declared effective by, the U.S. Securities and Exchange Commission. This news release shall not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of these securities in any state in which such offer, sale or solicitation would be unlawful prior to registration or qualification under the securities law in any such state.

This news release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Western Gas Partners believes that its expectations are based on reasonable assumptions. No assurance, however, can be given that such expectations will prove to have been correct. A number of factors could cause actual results to differ materially from the projections, anticipated results or other expectations expressed in this news release. See “Risk Factors” in the Form S-1 registration statement filed with the Securities and Exchange Commission by Western Gas Partners. Western Gas Partners undertakes no duty to publicly update these statements except as required by law.

WESTERN GAS PARTNERS, LP CONTACTS

MEDIA:

John Christiansen, [email protected], 832.636.8736

INVESTORS:

Chris Campbell, CFA, [email protected], 832.636.8434

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