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MarkWest Energy Partners Announces Acquisition of Keystone Midstream Services in Liquids Rich Area of Marcellus Shale, Extension of its NGL Gathering Network, and Utica Shale Letter Agreement

DENVER--(BUSINESS WIRE)--MarkWest Energy Partners, L.P. (MarkWest) (NYSE: MWE) today announced that it is acquiring 100% of the ownership interests of Keystone Midstream Services, LLC (Keystone), for consideration of $512 million. The transaction is expected to close during the second quarter of 2012.