MarkWest Completes Two Large Scale Facilities in the Northeast, Resumes Operations of Houston III Plant & for the Third

  MarkWest Completes Two Large Scale Facilities in the Northeast, Resumes
  Operations of Houston III Plant & for the Third Consecutive Period Achieves
  Top Honor for Midstream Customer Satisfaction

Business Wire

DENVER -- July 22, 2014

MarkWest Energy Partners, L.P. (NYSE: MWE) (“MarkWest” or “the Partnership”)
announced today an operational update regarding the continued development of
midstream infrastructure projects in the liquids-rich areas of the Marcellus
and Utica Shales.

In the Marcellus Shale, the Partnership has safely resumed operations of Plant
III at the Houston processing and fractionation complex (“Houston complex”) in
Washington County, PA. The Houston complex consists of three processing plants
totaling 355 million cubic feet per day (MMcf/d) and 98,000 barrels per day
(Bbl/d) of ethane and heavier fractionation capacity. Plant III is a 200
MMcf/d cryogenic facility that has been offline since May 28^th, 2014 after
the facility’s heat exchanger was damaged.

During the period required to complete all necessary repairs to Houston’s
Plant III, MarkWest was able to minimize disruption to its producer customers
by utilizing its large, high-pressure, rich-gas header system to route gas to
the Majorsville complex in Marshall County, West Virginia for processing.

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”), is in
startup mode for its third cryogenic processing plant at the Seneca complex in
Noble County, Ohio. The 200 MMcf/d Seneca III plant will increase total
processing capacity at the complex to 600 MMcf/d. The Seneca complex is
supported by long-term, fee-based contracts with Antero Resources Corporation
(NYSE: AR), Gulfport Energy Corporation (NASDAQ: GPOR), Rex Energy Corporation
(NASDAQ: REXX), PDC Energy Inc. (NASDAQ: PDCE), and other producers. MarkWest
Utica EMG continues to expand capacity at the Seneca complex and will complete
a fourth 200 MMcf/d plant in the second quarter of 2015.

In addition to the Seneca complex, MarkWest Utica EMG’s Cadiz complex in
Harrison County, Ohio, also continues to grow rapidly. MarkWest Utica EMG
recently completed a 40,000 barrel per day de-ethanization facility at the
Cadiz complex. This new facility will provide MarkWest Utica EMG’s producer
customers’ with the ability to meet residue gas quality specifications and
downstream ethane pipeline commitments. Ethane produced at the new Cadiz
facility will be delivered to the ATEX pipeline. In addition, during the third
quarter of 2014, the Cadiz II plant will become operational and increase total
cryogenic processing capacity at the Cadiz complex to 325 MMcf/d.

MarkWest has completed 25 major infrastructure projects in the last two years,
totaling over 3 billion cubic feet per day of processing capacity and nearly
200,000 Bbl/d of fractionation capacity to support producers’ midstream
requirements primarily in the Marcellus and Utica Shales. In the remaining six
months of 2014, the Partnership will complete five additional projects in the
Northeast and is constructing eight additional projects, that are scheduled to
begin operations in 2015 and beyond.

While continuing to execute the largest growth program in its history,
MarkWest has again achieved the first place ranking for Total Satisfaction in
the 2014 Oil & Natural Gas Midstream Services Customer Satisfaction Survey.
Conducted by EnergyPoint Research, this survey is the industry benchmark for
overall customer satisfaction in midstream services. This is the third
consecutive survey that the Partnership has earned the top honor for Total
Satisfaction, and the first since EnergyPoint began conducting the survey on
an annual basis. In total, MarkWest has achieved the highest ranking for total
customer satisfaction in four out of five surveys that EnergyPoint has
conducted since 2006.

MarkWest led all midstream service providers in the 2014 survey, receiving top
honors in five additional categories including, Operations, Gas & NGL
Purchasing, NGL Transportation & Storage, and Appalachian Basin – Marcellus
and Ark-La-Tex regions.

“We are very excited to announce the completion of new processing and
fractionation facilities in the Utica Shale, the completion of the Houston III
repairs and the results of EnergyPoint’s most recent survey,” stated Frank
Semple, Chairman, President, and Chief Executive Officer of MarkWest. “Our
employee’s ongoing ability to deliver best of class customer service continues
to drive our substantial organic growth program throughout all our operating


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, 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 a Houston-based management company for a series
of specialized private equity funds that focuses on investing across various
facets of the global natural resource industry including the upstream and
midstream segments of the energy complex. The firm was founded in 2006 by John
T. Raymond (majority owner and CEO) and John Calvert. EMG has approximately
$15.4 billion of regulatory assets under management, and approximately $6.6
billion in commitments have been allocated across the energy sector since
inception. For additional information on EMG, please contact Alexandra
Coolidge at713-579-5029.


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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