MarkWest Pioneer Announces Non-Binding Open Season / Reverse Open Season for the Arkoma Connector Pipeline

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Mon Jun 29, 2009 9:15am EDT

DENVER--(Business Wire)--
MarkWest Pioneer, L.L.C., a joint venture between affiliates of MarkWest Energy
Partners, L.P. (NYSE: MWE) and ArcLight Capital Partners, LLC, announced today a
non-binding open season / reverse open season through 5:00 p.m. MDT on July 20,
2009, for incremental firm transportation service on the Arkoma Connector
pipeline. 

The Arkoma Connector pipeline, which is currently under construction and near
completion, is a 50-mile interstate pipeline that will provide new Woodford
Shale takeaway capacity and interconnects with Midcontinent Express Pipeline and
Gulf Crossing Pipeline. 

MarkWest Pioneer has received inquiries regarding additional firm transportation
service on the Arkoma Connector and is conducting this non-binding open season
to gauge market interest in a possible expansion of the pipeline. In conjunction
with the non-binding open season, MarkWest Pioneer is conducting a non-binding
reverse open season for existing shippers to express interest in turning back
all or a portion of their current firm transportation entitlements. 

Following the non-binding open season / reverse open season, MarkWest Pioneer
will determine whether to proceed with an expansion of the pipeline and the
size, scope, and timing thereof. 

Additional information, including the Non-Binding Service Request Form and
Turnback Proposal Form, can be obtained on the Arkoma Connector Pipeline website
at www.arkomaconnector.com. Questions regarding the non-binding open season /
reverse open season should be directed to Bert Dillman, Vice President of
Business Development at MarkWest, at (713) 965-0742 or bdillman@markwest.com. 

About MarkWest Energy Partners

MarkWest Energy Partners, L.P. is a master limited partnership engaged in the
gathering, transportation, and processing of natural gas; the transportation,
fractionation, marketing, and storage of natural gas liquids; and the gathering
and transportation of crude oil. MarkWest has extensive natural gas gathering,
processing, and transmission operations in the southwest, Gulf Coast, and
northeast regions of the United States, including the Marcellus Shale, and is
the largest natural gas processor in the Appalachian region.

About ArcLight Capital Partners, LLC

ArcLight is a leading energy investment firm. Formed in 2001 by co-founders
Daniel R. Revers and Robb E. Turner, ArcLight manages over $6.8 billion in four
funds.For more information, please visit www.arclightcapital.com.

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.Among the factors that could cause results to differ
materially are those risks discussed in periodic reports filed with the SEC,
including MarkWest`s Annual Report on Form 10-K for the year ended December 31,
2008, and Quarterly Report on Form 10-Q for the three months ended March 31,
2009, as filed with the SEC.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
or
Nancy Buese, 866-858-0482
Senior VP & CFO
investorrelations@markwest.com
www.markwest.com
ArcLight Capital Partners, LLC
Daniel Revers, 617-531-6300
Managing Partner & Co-Founder
or
Robb Turner, 617-531-6300
Senior Partner & Co-Founder
or
Heidi Milne, 617-531-6300
Principal, Investor Relations
info@arclightcapital.com
www.arclightcapital.com



Copyright Business Wire 2009

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