MarkWest Energy Partners Announces Commencement of Additional Processing and Fractionation Infrastructure in Butler County, PA

  MarkWest Energy Partners Announces Commencement of Additional Processing and
  Fractionation Infrastructure in Butler County, PA

Business Wire

DENVER -- June 2, 2014

MarkWest Energy Partners, L.P. (NYSE: MWE) (“MarkWest” or “the Partnership”)
announced today the commencement of Bluestone II, a 120 million cubic feet per
day (MMcf/d) cryogenic processing facility. The Bluestone II plant is part of
the Partnership’s Keystone assets in Butler County, Pennsylvania and increases
processing capacity for Marcellus producers operating in the rich-gas area of
northwest Pennsylvania to 210 MMcf/d. Concurrently with the new processing
plant, MarkWest has also completed 20,000 barrels per day of ethane and
heavier fractionation capacity at the Bluestone facility, and a 32 mile purity
ethane pipeline connecting to Mariner West.

The Bluestone II plant primarily supports the expanding rich-gas production of
Rex Energy Corporation (NASDAQ: REXX) (“Rex Energy”). Rex Energy now has 190
MMcf/d of dedicated processing capacity at MarkWest’s Keystone facilities,
which also consist of 50 MMcf/d of capacity at the Bluestone I plant and 40
MMcf/d of capacity at the Sarsen facility. MarkWest continues to develop its
rich-gas gathering system throughout Butler County and surrounding areas in
order to support the continued growth of its processing facilities.

“We are excited to expand our processing and fractionation capacity in the
Marcellus Shale with the addition of new facilities in Butler County,” stated
Frank Semple, Chairman, President, and Chief Executive Officer of MarkWest.
“Rex is a proven operator and has been highly successful developing their
Marcellus and Upper Devonian resources in northwest Pennsylvania.”

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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