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MarkWest Energy Partners to Present at the National Association of Publicly Traded Partnerships 2012 MLP Investor Conference

DENVER--(BUSINESS WIRE)--May. 17, 2012-- MarkWest Energy Partners, L.P. (NYSE: MWE) announced today that Frank Semple, Chairman, President and CEO, will present at the National Association of Publicly Traded Partnerships (NAPTP) 2012 Master Limited Partnership Investor Conference at 4:30 p.m. Eastern Time on Wednesday, May 23, 2012, at the Hyatt Regency Greenwich in Old Greenwich, Connecticut.

Interested parties can listen to a live webcast of the presentation and download the related presentation materials by visiting the company’s website at under "Investor Relations / Presentations.” A replay of the webcast will be archived on the site shortly after the presentation has concluded and will be available for 30 days.

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 and fractionator 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 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 its operations, financial performance, and other factors as discussed in MarkWest’s 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 filed with the SEC, including MarkWest’s Annual Report on Form 10-K for the year ended December 31, 2011, and its Quarterly Report on Form 10-Q for the quarter ended March 31, 2012. 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.

Source: MarkWest Energy Partners, L.P.

MarkWest Energy Partners, L.P.
Frank Semple, 866-858-0482
Chairman, President & CEO
Nancy Buese, 866-858-0482
Senior VP and CFO

Josh Hallenbeck, 866-858-0482
VP of Finance & Treasurer