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News Release

MarkWest Energy Partners Announces Release Date for Fourth Quarter and Full year 2010 Financial Results

DENVER, January 20, 2011 – MarkWest Energy Partners, L.P. (NYSE: MWE) will

announce fourth quarter and full year 2010 financial results after market close on Monday, February

28, 2011, and will host a conference call to discuss the results at 4:00 p.m. ET on Tuesday, March 1,

2011.

The conference call can be accessed by dialing (800) 475-0218 (passcode “MarkWest”) or via

webcast by accessing the “Investor Relations” page of the MarkWest website at www.markwest.com.

A replay of the conference call will be accessible on the MarkWest website or by dialing (800)

879-1270 (no passcode required).

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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.

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 the periodic reports we file with the SEC, including

our Annual Report on Form 10-K for the year ended December 31, 2009, and our Quarterly Report on Form 10-Q for the

quarter ended September 30, 2010. 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
or
Dan Campbell, 866-858-0482
VP of Finance & Treasurer
investorrelations@markwest.com