MarkWest Energy Partners Expands Operations in Granite Wash with Commencement of Buffalo Creek Processing Facility

  MarkWest Energy Partners Expands Operations in Granite Wash with
  Commencement of Buffalo Creek Processing Facility

Business Wire

DENVER -- February 7, 2014

MarkWest Energy Partners, L.P. (NYSE: MWE) (“MarkWest”) (the “Partnership”)
announced today the completion of the 200 million cubic feet per day (MMcf/d)
Buffalo Creek cryogenic gas processing plant and associated high pressure
trunk line in the Granite Wash. The Buffalo Creek facility is supported by
long-term fee-based agreements with Chesapeake Energy Corporation (NYSE: CHK)
(“Chesapeake”). As part of the gas processing agreement with MarkWest,
Chesapeake dedicated approximately 130,000 acres throughout the Anadarko

The completion of the Buffalo Creek plant increases the Partnership’s total
processing capacity in the Anadarko Basin to 435 MMcf/d at two major
complexes. The 200 MMcf/d Buffalo Creek facility and the 235 MMcf/d Arapahoe
processing complex in Western Oklahoma are connected through the Partnership’s
extensive rich-gas gathering system, which provides 575 MMcf/d of gathering
throughput capacity and tremendous flexibility and reliability. MarkWest’s
infrastructure also provides producers with multiple residue gas outlets and
access to natural gas liquids takeaway pipelines to Mt. Belvieu and Conway.
MarkWest anticipates volumes at the new plant to ramp quickly as Chesapeake
has approximately 100 MMcf/d of existing production that the Partnership has
begun to process. Chesapeake has an active drilling program throughout the
area and MarkWest will continue supporting their development plans.

“The completion of the Buffalo Creek plant is critical to our ongoing support
of Chesapeake’s successful development of their Granite Wash acreage,” stated
Frank Semple, Chairman, President, and Chief Executive Officer of MarkWest.
“This new 200 million cubic feet per day processing plant and the associated
gathering and compression facilities will further expand MarkWest’s
significant midstream presence in the Texas Panhandle and Western Oklahoma.”

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 September 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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