Pioneer Southwest Energy Partners L.P. (“Pioneer Southwest”) (NYSE:PSE) today announced it has filed with the U.S. Securities and Exchange Commission its Annual Report on Form 10-K for the year ended December 31, 2011.

Pioneer Southwest’s 2011 Form 10-K can be viewed on the Partnership’s website at www.pioneersouthwest.com by selecting “Investors” and then “SEC Filings.”

Upon written request, investors may receive free of charge a hard copy of the Annual Report on Form 10-K (including complete audited financial statements). Written requests should be directed to Pioneer Southwest Energy Partners L.P. Investor Relations at 5205 N. O’Connor Blvd., Suite 200, Irving, Texas 75039-3746.

Pioneer Southwest is a Delaware limited partnership, headquartered in Dallas, Texas, with current production and drilling operations in the Spraberry field in West Texas.

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