MarkWest Energy Partners Announces Commencement of Additional Processing and Fractionation Infrastructure in Butler County, PA

DENVER--(BUSINESS WIRE)--MarkWest Energy Partners, L.P. (NYSE: MWE) (“MarkWest” or “the Partnership”) announced today the commencement of Bluestone II, a 120 million cubic feet per day (MMcf/d) cryogenic processing facility. The Bluestone II plant is part of the Partnership’s Keystone assets in Butler County, Pennsylvania and increases processing capacity for Marcellus producers operating in the rich-gas area of northwest Pennsylvania to 210 MMcf/d. Concurrently with the new processing plant, MarkWest has also completed 20,000 barrels per day of ethane and heavier fractionation capacity at the Bluestone facility, and a 32 mile purity ethane pipeline connecting to Mariner West.