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MarkWest Energy Partners to Present at the National Association of Publicly Traded Partnerships 2013 MLP Investor Conference

  MarkWest Energy Partners to Present at the National Association of Publicly
  Traded Partnerships 2013 MLP Investor Conference

Business Wire

DENVER -- April 30, 2013

MarkWest Energy Partners, L.P. (NYSE: MWE) announced today that Frank Semple,
Chairman, President and Chief Executive Officer, will present at the National
Association of Publicly Traded Partnerships (NAPTP) 2013 Master Limited
Partnership Investor Conference at 10:45 a.m. Eastern Time on Wednesday, May
22, 2013, at the Hilton Stamford Hotel in Stamford, 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, processing and transportation of natural gas; the gathering,
transportation, fractionation, storage and marketing of natural gas liquids;
and the gathering and transportation of crude oil. MarkWest has a leading
presence in many unconventional gas plays including the Marcellus Shale, Utica
Shale, Huron/Berea Shale, Haynesville Shale, Woodford Shale and Granite Wash

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 (SEC). 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, 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.


MarkWest Energy Partners, L.P.
Frank Semple, 866-858-0482
Chairman, President & CEO
Nancy Buese, 866-858-0482
Senior VP & CFO
Josh Hallenbeck, 866-858-0482
VP of Finance & Treasurer
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