MarkWest Energy Partners Increases Quarterly Cash Distribution

  MarkWest Energy Partners Increases Quarterly Cash Distribution

Business Wire

DENVER -- April 25, 2013

MarkWest Energy Partners, L.P. (NYSE: MWE) today announced that the Board of
Directors of the General Partner of MarkWest Energy Partners, L.P., declared a
cash distribution of $0.83 per common unit for the first quarter of 2013, for
an implied annual rate of $3.32 per common unit. The first quarter 2013
distribution represents an increase of $0.04 per common unit, or 5.1 percent,
compared to the first quarter 2012 distribution and an increase of $0.01 per
common unit, or 1.2 percent, compared to the fourth quarter 2012 distribution.

The first quarter 2013 distribution is payable May 15, 2013, to unitholders of
record on May 7, 2013. The ex-dividend date is May 3, 2013.

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 is intended to be a qualified notice under Treasury
Regulation Section 1.1446-4(b). Brokers and nominees should treat one hundred
percent (100.0%) ofMarkWest’s distributions to non-U.S. investors as being
attributable to income that is effectively connected with a United States
trade or business. Accordingly,MarkWest’s distributions to non-U.S. investors
are subject to federal income tax withholding at the highest applicable
effective tax rate.

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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