MarkWest Energy Partners to Start Open Season for Previously Announced Liberty Ethane Pipeline

  MarkWest Energy Partners to Start Open Season for Previously Announced
  Liberty Ethane Pipeline

Business Wire

DENVER -- November 7, 2013

MarkWest Energy Partners, L.P. (NYSE: MWE) and MarkWest Liberty Ethane
Pipeline, L.L.C. (“MarkWest Liberty”), collectively “MarkWest,” will hold a
binding open season for the previously announced Liberty Ethane Pipeline. The
open season will commence at 8:00 a.m. Mountain Time on November 8, 2013 and
will end at 5:00 p.m. Mountain Time on December 9, 2013. This pipeline is part
of MarkWest’s comprehensive ethane solution in the Northeast, which will
include purity ethane transportation infrastructure and de-ethanization
facilities located in Pennsylvania, West Virginia, and Ohio.

Subject to the outcome of the binding open season and all of the necessary
regulatory authorizations, the Liberty Ethane Pipeline will transport purity
ethane from Majorsville, Pennsylvania, to Houston, Pennsylvania. From there,
shippers will have direct access to multiple, major ethane takeaway projects
including Mariner West, Mariner East, and ATEX. The Liberty Ethane Pipeline is
expected to become operational in the fourth quarter of 2013.

The binding open season will allow interested parties to make volume
commitments and execute long-term transportation contracts with MarkWest
Liberty for transportation on the Liberty Ethane Pipeline. Shippers electing
to make long-term volume commitments to MarkWest Liberty will be eligible to
receive priority transportation service at a premium transportation rate for
their committed volumes.

The Liberty Ethane Pipeline will provide transportation of purity ethane to
ethane markets in North America and internationally. MarkWest is the first
midstream operator in the Northeast to offer its producer customers the
ability to recover and produce purity ethane and provide access to all
announced large-scale ethane pipeline projects. Ethane produced in the
Northeast has the potential to become a key driver for the future expansion of
the global petrochemical industry.

Parties interested in participating in the open season and shipping on the
Liberty Ethane Pipeline should contact Joshua Hallenbeck, VP of Finance and
Treasurer at (866) 858-0482 or Information on
the Liberty Ethane Pipeline and the binding open season can also be found on
MarkWest’s website at:

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

This press release includes “forward-looking statements.” All statements other
than statements of historical facts included or incorporated herein may
constitute forward-looking statements. Actual results could vary significantly
from those expressed or implied in such statements and are subject to a number
of risks and uncertainties. Although MarkWest believes that the expectations
reflected in the forward-looking statements are reasonable, MarkWest can give
no assurance that such expectations will prove to be correct. The
forward-looking statements involve risks and uncertainties that affect
operations, financial performance, and other factors as discussed in filings
with the Securities and Exchange Commission (SEC). Among the factors that
could cause results to differ materially are those risks discussed in the
periodic reports filed with the SEC, including MarkWest’s Annual Report on
Form 10-K for the year ended December 31, 2012 and our Quarterly Report on
Form 10-Q for the quarter ended June 30, 2013. You are urged to carefully
review and consider the cautionary statements and other disclosures made in
those filings, specifically those under the heading “Risk Factors.” MarkWest
does not undertake any duty to update any forward-looking statement except as
required by law.


MarkWest Energy Partners, L.P.
Frank Semple, 866-858-0482
Chairman, President & CEO
Nancy Buese, 866-858-0482
Executive VP & CFO
Josh Hallenbeck, 866-858-0482
VP of Finance & Treasurer
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