MarkWest Energy Partners Provides Marcellus Operational Update

  MarkWest Energy Partners Provides Marcellus Operational Update

Business Wire

DENVER -- September 27, 2013

MarkWest Energy Partners, L.P. (NYSE: MWE) (MarkWest) today provided
information regarding an August 2013 landslide which impacted a MarkWest
natural gas liquids (NGLs) pipeline in a remote area of northern Wetzel
County, West Virginia, causing a line break. The landslide originated from
significant erosion and run-off from heavy rainfall. MarkWest shut down the
pipeline and immediately commenced repairs and remediation of the impacted
portions of the pipeline. Repairs and remediation to the pipeline and rights
of way in the landslide impacted areas are currently underway, and MarkWest is
diligently working to complete the remedial work and return the pipeline to
service. The pipeline and the Mobley processing facilities will remain shut
down until the pipeline remedial work is completed, which is expected to be
approximately mid-October. The Sherwood processing facility continues to
operate at curtailed levels and NGLs from that facility are being transported
by truck for fractionation and sale. No other MarkWest facility has been
impacted. MarkWest does not expect the shutdown of these facilities to have a
material impact on its financial results.

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.


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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