MarkWest Energy Partners, L.P. (MarkWest) (NYSE: MWE) and The Energy &
Minerals Group (EMG) announced today the completion of the previously
announced Amended and Restated Limited Liability Company Agreement
(Amended LLC Agreement) for MarkWest Utica EMG, LLC (Utica Joint
Venture). The Utica Joint Venture is dedicated to the development of
critical midstream infrastructure on behalf of natural gas producers
operating throughout the liquids-rich Utica Shale formation in Ohio.

Under the terms of the Amended LLC Agreement, EMG will increase its
initial capital investment in the Utica Joint Venture from $ 500 million
to $ 950 million. The additional contributions from EMG provide MarkWest
with significant financial flexibility in the timing of its capital
contributions to the Utica Joint

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