MarkWest Energy Partners Announces Completion of Definitive Agreements with Antero Resources to Expand its Sherwood Processing

  MarkWest Energy Partners Announces Completion of Definitive Agreements with
  Antero Resources to Expand its Sherwood Processing Complex in the Marcellus
  Shale to 1 Bcf/d

Business Wire

DENVER -- November 7, 2013

MarkWest Energy Partners, L.P. (NYSE: MWE) (“MarkWest and the Partnership”)
announced today the completion of long-term, fee-based agreements with Antero
Resources (NYSE: AR) (“Antero”) for the development of an additional cryogenic
gas processing plant at the Partnership’s Sherwood complex in Doddridge
County, West Virginia. Under terms of the agreements, MarkWest will construct
a fifth 200 million cubic feet per day (MMcf/d) processing facility that is
expected to begin operations in the third quarter of 2014. Upon completion of
the new plant, the Sherwood complex will have 1 billion cubic feet per day
(Bcf/d) of total processing capacity.

Antero is a premier producer in the Northeast and is aggressively developing
their acreage position throughout the rich-gas Marcellus. The Sherwood complex
currently consists of two plants with 400 MMcf/d of capacity and is operating
near full utilization. By the end of this year, MarkWest will bring online a
third 200 MMcf/d plant at the complex and is quickly moving forward with the
construction of a fourth plant by the second quarter of 2014.

Antero’s natural gas liquids (NGLs) recovered at the Sherwood complex are
currently being delivered to MarkWest’s Houston complex in Washington County,
Pennsylvania for fractionation and marketing. The Houston complex is the
largest fractionation facility in the Northeast and provides extensive
logistics services, including storage and the delivery of purity products to
market by truck, rail and pipeline. In addition, the Houston complex offers
Marcellus producers the first large-scale de-ethanization facility in the
Northeast capable of producing purity ethane for delivery to Mariner West, and
ultimately to the ATEX and Mariner East projects.

“We are delighted to further expand our strong relationship with Antero and
develop additional processing capacity at the Sherwood complex to support
their highly successful drilling program,” said Frank Semple, Chairman,
President and Chief Executive Officer of MarkWest. “The ability to offer
producers fully integrated midstream services throughout northern West
Virginia and southwest Pennsylvania is critical to unlocking the abundant
rich-gas reserves of the Marcellus Shale. MarkWest is committed to providing
Antero and its other customers with unique solutions that are backed by our
best-in-class customer service.”

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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