MarkWest Energy Partners Resumes Operations of Houston Complex

  MarkWest Energy Partners Resumes Operations of Houston Complex

Business Wire

DENVER -- June 2, 2014

MarkWest Energy Partners, L.P. (NYSE: MWE) (“MarkWest” or “the Partnership”)
announced today the resumption of operations at its Houston processing and
fractionation complex (“Houston complex”) in Houston, Pennsylvania. As
previously announced, the Houston complex was shut down following what appears
to be a weather related incident that occurred on the evening of May 28, 2014.

The Houston complex consists of three processing plants totaling 355 million
cubic feet per day (MMcf/d) and 98,000 barrels per day of ethane and heavier
fractionation capacity. An engineering assessment and inspection of the
Houston complex’s facilities and equipment has indicated that the incident was
isolated to a heat exchanger that is required for the operation of Plant III.
Plants I and II and all of the fractionation units have safely been returned
to operation. Plant III will remain shut down in order to complete repairs.

In order to minimize the disruption to producer customers utilizing the
Houston complex, MarkWest is currently routing gas volumes to the Majorsville
complex in Marshall County, West Virginia. The Majorsville complex currently
consists of 870 MMcf/d of total processing capacity and is connected to the
Houston complex through a large, high-pressure, rich-gas header system.
MarkWest will continue routing gas to the Majorsville complex for processing
until all required repairs to Houston’s Plant III equipment have been
completed and the facility can safely return to normal operation.

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
formation.

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.

Contact:

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