MarkWest Provides Operational Update; Completes Seven Major Projects Totaling 1 Bcf/d of Additional Cryogenic Processing Capacity and 98,000 Bbl/d of New C2+ Fractionation Capacity

DENVER--(BUSINESS WIRE)--MarkWest Energy Partners, L.P. (NYSE: MWE) (“MarkWest”) (the “Partnership”) announced today an operational update regarding the development of midstream infrastructure projects in the liquids-rich areas of the Marcellus and Utica Shales. In the last four months, MarkWest has commenced operations of seven major infrastructure projects in the Northeast including five new cryogenic processing plants totaling 1 billion cubic feet per day (Bcf/d) of capacity and two fractionation facilities totaling 98,000 barrels per day (Bbl/d) of C2+ fractionation capacity. MarkWest continues to expand its leading midstream presence throughout the Northeast and currently has 17 major processing and fractionation projects under construction. These projects are occurring at nine locations in Ohio, Pennsylvania, and West Virginia and are expected to increase the Partnership’s total processing capacity to approximately 4.7 Bcf/d and total fractionation capacity in the region to over 400,000 barrels per day (Bbl/d).