MarkWest Provides Operational Update Which Includes the Startup of Two New Cryogenic Processing Plants Increasing Total Capacity in the Marcellus and Utica Shales to Over 2.2 Bcf/d

DENVER--(BUSINESS WIRE)--MarkWest Energy Partners, L.P. (NYSE: MWE) (“MarkWest or the Partnership”) announced today an operational update regarding the development of midstream infrastructure projects in the heart of the rich-gas areas of the Marcellus and Utica Shales. MarkWest continues to expand its leading midstream presence throughout the Northeast and currently has 21 major processing and fractionation projects under construction. These projects are occurring at eight large-scale complexes in Ohio, Pennsylvania, and West Virginia and are expected to increase the Partnership’s total processing capacity to over 4 billion cubic feet (Bcf/d) and total fractionation capacity to nearly 300,000 barrels per day (Bbl/d) by the end of 2014.