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Western Gas Partners, LP Prices Public Offering of 4,000,000 Common Units

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HOUSTON, May 13, 2010 (BUSINESS WIRE) –Western Gas Partners, LP (NYSE: WES) today announced that it has priced its public offering of 4,000,000 common units representing limited partner interests. Western Gas Partners has granted the underwriters a 30-day option to purchase up to 600,000 additional common units. The common units were offered to the public at $22.25 per unit. The offering is expected to settle and close on May 18, 2010, subject to customary closing conditions. Net proceeds from the offering are expected to be used to repay amounts outstanding under the partnership’s $350 million revolving credit facility.

UBS Investment Bank, Citi and Morgan Stanley are acting as joint book-running managers for the offering. The offering will be made only by means of a prospectus and related prospectus supplement, copies of which may be obtained from UBS Investment Bank, Prospectus Dept., 299 Park Avenue, New York, NY 10171, or by calling (888) 827-7275; Citi, Brooklyn Army Terminal, 140 58th Street, 8th Floor, Brooklyn, NY 11220, Attention: Prospectus Department, or by calling (800) 831-9146 or by emailing [email protected]; or Morgan Stanley, 180 Varick Street, 2nd Floor, New York, NY 10014, Attention: Prospectus Dept., or by calling (866) 718-1649 or by emailing[email protected]. An electronic copy of the prospectus and prospectus supplement is available from the U.S. Securities and Exchange Commission’s website at http://www.sec.gov.

This press 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 or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of such state or jurisdiction. The offer is being made only through the prospectus as supplemented, which is part of a shelf registration statement that became effective on August 17, 2009.

This news release contains forward-looking statements. Western Gas Partners and its general partner believe that their 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, including Western Gas Partners’ ability to close successfully on the common units offering and to use the net proceeds as indicated in this news release. See “Risk Factors” in Western Gas Partners’ Annual Report on Form 10-K for the year ended December 31, 2009 and other public filings and press releases. Except as required by law, Western Gas Partners undertakes no obligation to publicly update or revise any forward-looking statements.

SOURCE: Western Gas Partners, LP

Western Gas Partners, LP

Chris Campbell, CFA, 832.636.6012

[email protected]

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