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Western Gas Partners Announces Pricing of $150 Million of Senior Notes

HOUSTON–(BUSINESS WIRE)–Oct. 9, 2012– Western Gas Partners, LP (NYSE:WES) today announced that it has priced an offering of an additional $150,000,000 in aggregate principal amount of 4.0% senior notes due 2022 at a price to the public of 105.178% of their face value, equating to a yield to maturity of 3.356%. The senior notes are being offered as additional senior notes under an indenture pursuant to which Western Gas Partners issued $520 million aggregate principal amount of 4.0% senior notes due 2022 on June 28, 2012. These new senior notes are identical to, and will be treated as a single class of debt securities with, the previously issued senior notes under the indenture governing the senior notes. The offering of the senior notes is expected to close on October 18, 2012, subject to customary closing conditions. Net proceeds from the offering are expected to be used for general partnership purposes.

RBS Securities Inc., DNB Markets, Inc., Mitsubishi UFJ Securities (USA), Inc., Scotia Capital (USA) Inc.and UBS Securities LLC are acting as joint book-running managers for the offering.

These securities are being offered pursuant to a shelf registration statement that became effective onMay 9, 2011. These securities are only being offered by means of a prospectus and related prospectus supplement, copies of which may be obtained from RBS Securities Inc., 600 Washington Boulevard,Stamford, CT 06901 (866-884-2071); DNB Markets, Inc., 200 Park Avenue, 31st Floor, New York, NY10166, Attention: Debt Capital Markets (212-681-3800); Mitsubishi UFJ Securities (USA), Inc., 1633 Broadway, 29th Floor, New York, NY 10019, Attention: Capital Markets Group (Fax: 646-434-3455, Toll-free Prospectus Request Hotline: 877-649-6848); Scotia Capital (USA) Inc., 165 Broadway, 25th Floor,One Liberty Plaza, New York, NY 10006, Attention: Debt Capital Markets (800-372-3930); or UBS Securities LLC, 299 Park Avenue, New York, NY 10171, Attention: Prospectus Specialist (877-827-6444, ext. 561 3884).

An electronic copy of the prospectus and related prospectus supplement is available from the U.S. Securities and Exchange Commission’s website at 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.

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 senior notes 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, 2011 and Quarterly Report on Form 10-Q for the quarter ended June 30, 2012 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

Benjamin Fink, CFA, 832-636-6010

SVP, Chief Financial Officer & Treasurer

[email protected]

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