MarkWest Energy Partners Provides Update Regarding May 28 Incident at Its Houston Complex

  MarkWest Energy Partners Provides Update Regarding May 28 Incident at Its
  Houston Complex

Business Wire

DENVER -- May 29, 2014

MarkWest Energy Partners, L.P. (NYSE: MWE) (“MarkWest” or “the Partnership”)
reported an incident at its Houston processing and fractionation complex in
Houston, Pennsylvania at approximately 6:00 p.m. (EDT) yesterday. The Houston
complex consists of processing plants I, II and III totaling 355 million cubic
feet per day (MMcf/d) of capacity and 98,000 barrels per day of ethane and
heavier fractionation capacity with associated storage facilities and other
related infrastructure. There were no reported injuries and as a precaution,
the area was safely and temporarily evacuated.

Although MarkWest has not completed a full assessment of all plant equipment,
an initial visual assessment of damage indicates that the impact was limited
to one component of the plant III facility. The entire complex remains shut
down until the assessment is completed. At this time, it appears that no other
equipment at the facility was affected. Additionally, there are no apparent
signs or evidence of a fire. The complex’s safety control system worked as
designed and the two flares at the facility remained in operation throughout
the course of this event.

MarkWest is working closely with its producer customers and is currently
routing some gas through its rich-gas header system to the Majorsville complex
in Marshall County, West Virginia. The Majorsville complex currently consists
of 870 MMcf/d of processing capacity.

MarkWest would like to thank the local first responders and Washington County
emergency management personnel who acted quickly and decisively to ensure the
public’s safety. MarkWest notified the appropriate government officials and
agencies. The area will remain secure until the review is completed.

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.


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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