MarkWest Energy Partners, L.P. (NYSE: MWE) (“MarkWest or “the Partnership”) and The Energy & Minerals Group (“EMG”), today announced plans to add additional capacity at their Hopedale fractionation and marketing complex (“Hopedale complex”) in Harrison County, Ohio in order to meet growing natural gas liquids (NGLs) production in the Utica and Marcellus Shales under new contracted commitments from numerous producer customers. The Hopedale complex is jointly owned by a subsidiary of MarkWest and MarkWest Utica EMG, L.L.C. (“MarkWest Utica EMG”) a joint venture between the Partnership and EMG. The expansion will double the propane and heavier fractionation capacity at the Hopedale complex to 120,000 barrels per day (Bbl/d) and is expected to be operational in the first quarter of 2015. MarkWest and MarkWest Utica EMG are committed to developing world-class fractionation capacity in the Northeast, as these facilities are critical for producers achieving the highest price for their valuable NGLs. Once the Hopedale expansion is complete, MarkWest will operate 300,000 Bbl/d of ethane and heavier fractionation capacity at four complexes in the Northeast. The Partnership also has an NGL gathering pipeline connecting its Hopedale complex to its industry-leading NGL infrastructure in the Marcellus Shale. NGL takeaway solutions to the Gulf Coast and international markets will be complementary to existing fractionation infrastructure and will provide producers with additional market outlets that are crucial to the long-term development of the region. “Together with EMG, our expansion of fractionation capacity in Ohio is a resounding commitment to deliver exceptional midstream services and NGL solutions in the Northeast,” stated Frank Semple, Chairman, President, and Chief Executive Officer of MarkWest. “As Northeast NGL production continues to grow, in-basin fractionation will be essential to support the ongoing development plans of our producers in the Utica and Marcellus.” MarkWest Energy Partners, L.P. is a master limited partnership engaged in the gathering, processing and transportation of natural gas; the gathering, transportation, fractionation, storage and marketing of natural gas liquids; and the gathering and transportation of crude oil. MarkWest has a leading presence in many unconventional gas plays including the Marcellus Shale, Utica Shale, Huron/Berea Shale, Haynesville Shale, Woodford Shale and Granite Wash formation.