MarkWest Energy Partners Announces Expansion of Processing Capacity in the Marcellus Shale

  MarkWest Energy Partners Announces Expansion of Processing Capacity in the
  Marcellus Shale

Business Wire

DENVER -- May 6, 2014

MarkWest Energy Partners, L.P. (NYSE: MWE) (“MarkWest and “the Partnership”)
today announced an expansion of rich-gas processing capacity in the Marcellus
Shale. The Partnership will continue developing its leading presence in
America’s most productive natural gas resource play with the addition of two
new cryogenic processing plants at its Sherwood complex in Doddridge County,
West Virginia and its Mobley Complex in Wetzel County, West Virginia.

At the Sherwood complex, MarkWest will construct an additional 200 million
cubic feet per day (MMcf/d) processing plant at the request of Antero
Resources Corporation (NYSE: AR) (Antero). The new plant is anchored by a
long-term, fee-based contract and will expand total capacity at the Sherwood
complex to 1.2 billion cubic feet (Bcf/d) by the second quarter of 2015.
Antero continues to develop its prolific rich-gas acreage position in northern
West Virginia and is the anchor producer supporting the Sherwood complex.

At the Mobley complex, MarkWest will increase total processing capacity to 920
MMcf/d with the construction of an additional 200 million cubic feet per day
processing plant at the request of EQT Corporation (NYSE: EQT). The new plant
is anchored by a long-term, fee-based contract and is expected to be in
service by the second quarter of 2015. The Mobley complex currently consists
of three plants with 520 MMcf/d of total processing capacity and during the
fourth quarter of this year, MarkWest will begin operations of a fourth plant
at the complex, increasing capacity to 720 MMcf/d. The Mobley complex supports
growing Marcellus rich-gas production from EQT, Magnum Hunter Resources
Corporation (NYSE: MHR), Stone Energy Corporation (NYSE: SGY), CONSOL Energy
Inc. (NYSE: CNX), and Noble Energy, Inc. (NYSE: NBL).

MarkWest continues to develop its leading midstream position in the Marcellus
and Utica shales with 17 major processing and fractionation projects currently
under development. In 2014, MarkWest expects to complete 11 of these projects,
bringing total Northeast processing and fractionation capacity to 4 Bcf/d and
250,000 barrels per day, respectively.

“We are very excited to continue developing critical midstream infrastructure
on behalf of Antero and EQT,” commented Frank Semple, Chairman, President and
Chief Executive Officer.“The ongoing success of our producer customers is
truly impressive and our Sherwood and Mobley complexes are two of our premier
assets in the rich-gas areas of the Marcellus Shale.”

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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