MarkWest Provides Operational Update Which Includes the Startup of Two New Cryogenic Processing Plants Increasing Total Capacity

  MarkWest Provides Operational Update Which Includes the Startup of Two New
  Cryogenic Processing Plants Increasing Total Capacity in the Marcellus and
  Utica Shales to Over 2.2 Bcf/d

Business Wire

DENVER -- November 8, 2013

MarkWest Energy Partners, L.P. (NYSE: MWE) (“MarkWest or the Partnership”)
announced today an operational update regarding the development of midstream
infrastructure projects in the heart of the rich-gas areas of the Marcellus
and Utica Shales. MarkWest continues to expand its leading midstream presence
throughout the Northeast and currently has 21 major processing and
fractionation projects under construction. These projects are occurring at
eight large-scale complexes in Ohio, Pennsylvania, and West Virginia and are
expected to increase the Partnership’s total processing capacity to over 4
billion cubic feet (Bcf/d) and total fractionation capacity to nearly 300,000
barrels per day (Bbl/d) by the end of 2014.

In the Marcellus, MarkWest has commenced operations of Majorsville V, a 200
million cubic feet per day (MMcf/d) plant at the Majorsville complex in
Marshall County, West Virginia. The new plant supports growing rich-gas
production from Chesapeake Energy Corporation (NYSE: CHK), and Statoil ASA
(NYSE: STO) and increases the total processing capacity at the complex to 670
MMcf/d. The Partnership expects to complete an additional 200 MMcf/d plant
during the first quarter of 2014 and will bring online a sixth plant in early
2016. Upon completion of these facilities, the Majorsville complex will have
over 1 Bcf/d of capacity.

Over the next month, MarkWest will also bring online its second large scale
de-ethanizer in the Marcellus Shale at the Majorsville complex. The new
facility will double the Partnership’s purity ethane fractionation capacity to
78,000 Bbl/d in the Marcellus Shale and provide producer customers’ with the
ability to meet residue gas quality specifications and downstream ethane
pipeline commitments. Ethane produced at the new Majorsville fractionation
facility will initially be delivered into the Mariner West pipeline and, in
the future, to the ATEX and Mariner East pipeline projects.

In the Utica Shale, MarkWest Utica EMG, L.L.C. (“MarkWest Utica EMG”), a joint
venture between MarkWest and The Energy and Minerals Group (EMG), has
commenced operations of its first cryogenic processing plant at the Seneca
complex in Noble County, Ohio. The 200 MMcf/d Seneca I plant will be followed
by a second 200 MMcf/d plant by the end of this year, and a third 200 MMcf/d
plant by the second quarter of 2014. The Seneca complex is MarkWest Utica
EMG’s second major processing complex in the core area of the rich-gas Utica
Shale. By the end of 2014, total processing capacity in Ohio will reach almost
1 billion cubic feet per day.

The Seneca complex is supported by long-term, fee-based contracts with several
key producers. Antero Resources Corporation (NYSE: AR) will anchor the complex
and the facilities will also play a key role in the rich-gas development of
Gulfport Energy Corporation (NASDAQ: GPOR), Rex Energy Corporation (NASDAQ:
REXX), PDC Energy Inc. (NASDAQ: PDCE), CONSOL Energy Inc. (NYSE: CNX), and
others. The Seneca complex is connected to MarkWest Utica EMG’s Cadiz complex
in Harrison County, Ohio by a high-pressure rich-gas header system. By
connecting these large-scale processing facilities, MarkWest Utica EMG
provides producer customers with unparalleled flexibility and reliability and
the largest integrated cryogenic gas processing infrastructure in the Utica

“The completion of our first Seneca plant is a key milestone in the rapid
development of MarkWest Utica EMG’s leading full-service midstream
infrastructure in the emerging Utica Shale. We are also very excited to
continue expanding our Majorsville complex,” stated Frank Semple, Chairman,
President, and Chief Executive Officer. “We continue to provide producer
customers operating in the Northeast shales with fully-integrated midstream
solutions that will further accelerate the development of their prolific
rich-gas acreage.”

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.

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 $6.7 billion
of total investor commitments (including co-investments) with in excess of
$4.2 billion allocated across the energy sector since inception.


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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