MarkWest Energy Partners Increases Quarterly Cash Distribution

  MarkWest Energy Partners Increases Quarterly Cash Distribution

Business Wire

DENVER -- January 23, 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 $0.82 per common unit for the fourth quarter of 2012, for
an implied annual rate of $3.28 per common unit. The fourth quarter 2012
distribution represents an increase of $0.06 per common unit, or 7.9 percent,
compared to the fourth quarter 2011 distribution and an increase of $0.01 per
common unit, or 1.2 percent, compared to the third quarter 2012 distribution.

The fourth quarter 2012 distribution is payable February 14, 2013, to
unitholders of record on February 6, 2013. The ex-dividend date is February 4,

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 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. 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 Reports on Form 10-Q
for the quarters ended March 31, 2012, June 30, 2012 and September 30, 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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