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MarkWest Energy Partners Increases Equity Ownership in Centrahoma Processing LLC
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DENVER—May 12, 2008— MarkWest Energy Partners, L.P. (“MarkWest”) (NYSE: MWE) today announced that it increased its ownership interest in Centrahoma Processing LLC ("Centrahoma”) to 40 percent for $12.0 million. On March 1, 2008, MarkWest acquired its initial 20 percent interest in Centrahoma for $11.6 million. Centrahoma includes two cryogenic gas processing plants located in Southeast Oklahoma. These plants are currently operating near their capacity of 100 million cubic feet per day of hydrocarbon-rich gas from the rapidly expanding Woodford Shale play.

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MarkWest Energy Partners, L.P. (NYSE:MWE) is a growth-oriented 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 southwestern and Gulf Coast regions of the United States and is the largest natural gas processor in the Appalachian region. The primary business strategy of MarkWest is to provide outstanding customer service at competitive rates and to expand its assets and cash flow available for distribution through a balanced combination of organic growth projects and selective acquisitions.

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 we believe that the expectations reflected in the forward-looking statements are reasonable, we can give no assurance that such expectations will prove to be correct. The forward-looking statements involve risks and uncertainties that affect our operations, financial performance, and other factors as discussed in our filings with the Securities and Exchange Commission. Among the factors that could cause results to differ materially are those risks discussed in our Annual Report on Form 10-K, as amended, for the year ended December 31, 2007, 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.” We do 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
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Dan Campbell, 866-858-0482
VP of Finance & Treasurer
investorrelations@markwest.com