PSE Pioneer Southwest Energy Partners L.P. Pioneer Southwest Energy Partners Lp

Pioneer Southwest Energy Partners L.P. (�Pioneer Southwest�) (NYSE:PSE) today announced that Rich Dealy, Executive Vice President and CFO, will participate on a panel discussing E&P Master Limited Partnerships (MLP) at RBC Capital Markets MLP Conference on November 20, 2008 at 2:25 p.m. CT. The audio webcast will be available on November 13 on Pioneer Southwest Energy's website www.pioneersouthwest.com. Select �Investors,� then �Investor Presentations.� Pioneer Southwest is a Delaware limited partnership formed by Pioneer Natural Resources Company to own and acquire oil and gas assets in its area of operations. This area includes onshore Texas and eight counties in the southeast region of New Mexico.