MarkWest Provides Operational Update; Completes Seven Major Projects Totaling 1 Bcf/d of Additional Cryogenic Processing

  MarkWest Provides Operational Update; Completes Seven Major Projects
  Totaling 1 Bcf/d of Additional Cryogenic Processing Capacity and 98,000
  Bbl/d of New C2+ Fractionation Capacity

Business Wire

DENVER -- January 30, 2014

MarkWest Energy Partners, L.P. (NYSE: MWE) (“MarkWest”) (the “Partnership”)
announced today an operational update regarding the development of midstream
infrastructure projects in the liquids-rich areas of the Marcellus and Utica
Shales. In the last four months, MarkWest has commenced operations of seven
major infrastructure projects in the Northeast including five new cryogenic
processing plants totaling 1 billion cubic feet per day (Bcf/d) of capacity
and two fractionation facilities totaling 98,000 barrels per day (Bbl/d) of
C2+ fractionation capacity. MarkWest continues to expand its leading midstream
presence throughout the Northeast and currently has 17 major processing and
fractionation projects under construction. These projects are occurring at
nine locations in Ohio, Pennsylvania, and West Virginia and are expected to
increase the Partnership’s total processing capacity to approximately 4.7
Bcf/d and total fractionation capacity in the region to over 400,000 barrels
per day (Bbl/d).

In the Marcellus Shale, the Partnership commenced operations of three new
processing plants during the fourth quarter of 2013. These new plants were
commissioned at the Majorsville, Mobley, and Sherwood complexes and have
increased MarkWest’s total processing capacity in the liquids-rich corridor of
the Marcellus to over 2.2 Bcf/d. At the Majorsville complex in Marshall
County, West Virginia, MarkWest increased total capacity to 670 million cubic
feet per day (MMcf/d) with the addition of Majorsville V, a 200 MMcf/d plant
to support Chesapeake Energy Corporation (NYSE: CHK) and Statoil ASA (NYSE:
STO). At the Mobley complex in Wetzel County, West Virginia, MarkWest
increased total capacity to 520 MMcf/d with startup of Mobley III, a 200
MMcf/d plant to support rapidly growing rich-gas production from EQT
Corporation (NYSE: EQT) and Magnum Hunter Resources Corporation (NYSE: MHR).
At the Sherwood complex in Doddridge County, West Virginia, MarkWest expanded
total capacity to 600 MMcf/d after bringing online Sherwood III, a 200 MMcf/d
to support Antero Resources Corporation’s (NYSE: AR) (Antero) extensive
Marcellus development program.

In early December 2013, MarkWest doubled its purity ethane fractionation
capacity in the Marcellus to 76,000 Bbl/d with the startup of its second
de-ethanization facility. The new facility is located at the Majorsville
complex and will provide the Partnership’s producer customers’ with the
ability to consistently meet residue gas quality specifications and deliver
downstream ethane pipeline commitments. In conjunction with the commencement
of de-ethanization services at Majorsville, MarkWest’s previously announced
Liberty Ethane Pipeline became operational. The Liberty Ethane Pipeline
transports purity ethane from the Majorsville complex to the Houston complex
in Washington County, Pennsylvania. Once delivered at Houston, the purity
ethane has direct access to multiple, major ethane takeaway projects
including, Mariner West and ATEX, which began operations in December, and
Mariner East, which is scheduled to come online in 2014. MarkWest is the first
midstream operator in the Northeast to offer its producer customers the
ability to recover and produce purity ethane and provide transportation
infrastructure to all announced ethane pipeline takeaway projects. Ethane
produced in the Northeast has the potential to become a key driver for the
future expansion of the global petrochemical industry.

In the Utica Shale, MarkWest Utica EMG, L.L.C. (“MarkWest Utica EMG”) a joint
venture between MarkWest and The Energy & Minerals Group (EMG) commenced
operations of the Seneca complex in Noble County, Ohio. The Seneca complex is
currently comprised of two processing plants totaling 400 MMcf/d, which
support rich-gas Utica production from Antero, PDC Energy, Inc. (NASDAQ:
PDCE), Rex Energy Corporation (NASDAQ: REXX), and others. The Seneca complex
is MarkWest Utica EMG’s second large-scale processing complex in the Utica
Shale and represents the southernmost assets included in its fully-integrated
midstream system spanning a five-county region of eastern Ohio. The system is
comprised of hundreds of miles of low- and high-pressure gathering pipeline,
nearly 600 MMcf/d of gas processing services, natural gas liquids (NGL)
transportation infrastructure, and most recently, a new world-class NGL
fractionation facility.

In January 2014, MarkWest Utica EMG and the Partnership commenced operations
of the jointly-owned Hopedale fractionation and marketing complex in Harrison
County, Ohio. The complex’s 60,000 Bb/d propane and heavier fractionation
plant, associated purity product storage capacity and marketing logistics
terminal capabilities are critical midstream assets in the heart of one of the
most prospective resource plays in the United States. In conjunction with the
startup of the Hopedale complex, MarkWest commenced operations of a pipeline
connecting its Marcellus and Utica NGL infrastructure. By integrating two
industry-leading midstream systems, MarkWest will be able to effectively
expand fractionation services for its Marcellus producers, while
simultaneously delivering unrivaled reliability and optionality for producers
in the Utica.

“We are exceptionally proud to continue expanding our essential midstream
services on behalf of producers operating in the Marcellus and Utica,”
commented Frank Semple, Chairman, President, and Chief Executive Officer of
MarkWest. “The completion of one billion cubic feet of new processing capacity
and nearly one-hundred thousand barrels per day of added fractionation
services over the last four months is a testament to the extraordinary pace of
U.S. energy production occurring in the Northeast shales. MarkWest is
committed to creating long-term partnerships, developing unique solutions, and
the required infrastructure needed to ensure that our customers remain at the
forefront of domestic energy production for decades to come.”

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 September 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.

The Energy & Minerals Group is the management company for a series of
specialized private equity funds. EMG focuses on investing across various
facets of the global natural resource industry including the upstream and
midstream segments of the energy complex. EMG has approximately $8.4 billion
of total investor commitments (including co-investments) with approximately
$5.2 billion allocated across the energy sector since inception. For
additional information on EMG, please contact Alexandra Coolidge at


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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