Western Gas Partners, LP (the Partnership) is a master limited partnership (MLP) organized by Anadarko Petroleum Corporation to own, operate, acquire and develop midstream energy assets. The Partnership operates in East and West Texas, the Rocky Mountains and the Mid-Continent and is engaged primarily in the business of gathering, processing, compressing, treating and transporting natural gas, condensate, natural gas liquids (NGLs) and crude oil for Anadarko and third-party producers and customers. As of December 31, 2011, the Company�s assets consist of 11 gathering systems, seven natural gas treating facilities, seven natural gas processing facilities, one NGL pipeline, one interstate pipeline, and interests in a gas gathering system and a crude oil pipeline. On January 13, 2012, the Partnership completed the acquisition of Anadarko�s 100% ownership interest in Mountain Gas Resources, LLC. In August 2012, it acquired an additional 24% membership interest in Chipeta Processing LLC.