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MarkWest Pioneer Announces Non-Binding Open Season / Reverse Open Season for the Arkoma Connector Pipeline
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DENVER—June 29, 2009—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.

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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 and CFO
or
Dan Campbell, 866-858-0482
VP of Finance & Treasurer
investorrelations@markwest.com