MarkWest Energy Partners Sells WV Marcellus Shale Gathering Assets to Summit Midstream Partners for $210M in Cash

MarkWest Energy Partners, L.P.

(MarkWest) and Summit Midstream Partners, LP

(Summit) announced today the execution of definitive agreements whereby Summit will acquire certain gas gathering assets from MarkWest in Doddridge County, West Virginia for $210 million in cash. Rich-gas gathered by these assets is dedicated to MarkWest for processing at the Sherwood complex, also located in Doddridge County, West Virginia. The transaction is expected to close in June 2013. The assets included in this transaction consist of over 40 miles of newly constructed high-pressure gas gathering pipelines, certain rights-of-way associated with the pipeline, and two compressor stations totaling over 21,000 horsepower of combined compression. The rich-gas