MarkWest Hydrocarbon Provides Election Procedures Reminder

DENVER--(BUSINESS WIRE)--Feb. 5, 2008--MarkWest Hydrocarbon, Inc.
(AMEX: MWP) (the "Corporation") sent to its stockholders of record, on
or about January 18, 2008, a Joint Proxy Statement/Prospectus seeking
approval of the Redemption and Merger transaction between MarkWest
Energy Partners, L.P. and the Corporation, as announced on September
5, 2007 (the "Merger"). The stockholders of the Corporation should
have separately received an Election Form for stockholders to elect
the form of consideration they prefer to receive in exchange for their
shares of MarkWest Hydrocarbon common stock in connection with the
Merger.

The Corporation stockholders may elect to receive the stated
consideration of 1.285 common units of MarkWest Energy Partners plus
$20.00 cash, on a per-share basis, or they may elect to receive all
cash, all common units, or a combination thereof, subject to pro
ration and an equalization formula.

The Corporation reminds its stockholders that receipt of a
completed Election Form by Wells Fargo Bank, N.A., the
Redemption/Exchange Agent, is due by 5:00 p.m. Eastern Standard Time
on February 20, 2008 (the "Election Deadline").

Corporation stockholders whose shares of MarkWest Hydrocarbon are
held in a brokerage account should have received an Election Form from
their broker. If a stockholder has not yet received an Election Form,
the stockholder should immediately contact their broker to obtain the
Election Form, and then timely provide their broker with their
election, so that their broker may submit such information to the
Redemption/Exchange Agent on or before the Election Deadline.

Should stockholders have any questions regarding the election
process or the Election Form, the stockholder should contact:

The Altman Group, Inc.

1200 Wall Street West -- 3rd Floor

Lyndhurst, NJ 07071

Toll-free: 866-822-1239

MarkWest Hydrocarbon, Inc. (AMEX: MWP) controls and operates
MarkWest Energy Partners, L.P. (NYSE: MWE), a publicly traded limited
partnership engaged in the gathering, processing and transmission of
natural gas; the transportation, fractionation and storage of natural
gas liquids; and the gathering and transportation of crude oil. We
also market natural gas and NGLs.

Although we believe that the expectations reflected in the
forward-looking statements, specifically those referring to future
performance, growth, cash flow, operating income, distributable cash
flow (DCF), distributions, or other factors, are reasonable, these
forward-looking statements are not guarantees of future performance,
and we can give no assurance that such expectations will prove to be
correct and that projected performance or distributions may not be
achieved. Among the factors that could cause results to differ
materially are those risks discussed in our Form S-1, as amended, our
Annual Report on Form 10-K for the year ended December 31, 2006, as
amended, and our Quarterly Reports on Form 10-Q, each as filed with
the SEC. You are also urged to carefully review and consider the
cautionary statements and other disclosures, including those under the
heading "Risk Factors," made in those filings, which identify and
discuss significant risks, uncertainties and various other factors
that could cause actual results to vary significantly from those
expressed or implied in the forward-looking statements. We do not
undertake any duty to update any forward-looking statement.

MarkWest Energy Partners and MarkWest Hydrocarbon filed a
definitive joint proxy statement/prospectus and other documents with
the Securities and Exchange Commission (the "SEC") in relation to the
merger transaction announced on September 5, 2007. Investors and
security holders are urged to read these documents carefully when they
become available because they will contain important information
regarding MarkWest Energy Partners, MarkWest Hydrocarbon, and the
transaction. A definitive joint proxy statement/prospectus will be
sent to security holders of MarkWest Energy Partners and MarkWest
Hydrocarbon seeking their approval of the transactions contemplated by
the redemption and merger agreement. Investors and security holders
may obtain a free copy of the joint proxy statement/prospectus (when
it is available) and other documents containing information about
MarkWest Energy Partners and MarkWest Hydrocarbon, without charge, at
the SEC's website at www.sec.gov. Copies of the joint proxy
statement/prospectus and the SEC filings that will be incorporated by
reference in the joint proxy statement/prospectus may also be obtained
free of charge by directing a request to the entities' investor
relations department at 866-858-0482, or by accessing their website at
www.markwest.com.

MarkWest Energy Partners, MarkWest Hydrocarbon, the officers and
directors of the general partner of MarkWest Energy Partners, and the
officers and directors of MarkWest Hydrocarbon may be deemed to be
participants in the solicitation of proxies from their security
holders. Information about these persons can be found in the Annual
Report on Form 10-K for each of MarkWest Energy Partners and MarkWest
Hydrocarbon, as filed with the SEC, and additional information about
such persons may be obtained from the joint proxy
statement/prospectus.

This document shall not constitute an offer to sell or the
solicitation of an offer to buy any securities, nor shall there be any
sale of securities in any jurisdiction in which such offer,
solicitation, or sale would be unlawful prior to registration or
qualification under the securities laws of any such jurisdiction. No
offering of securities shall be made except by means of a prospectus
meeting the requirements of the Securities Act of 1933, as amended.

CONTACT: MarkWest Hydrocarbon, Inc.
Frank Semple, 866-858-0482
President & CEO
or
Nancy Buese, 866-858-0482
Senior VP & CFO
or
Andy Schroeder, 866-858-0482
VP Finance & Treasurer
Fax: 303-925-9308
investorrelations@markwest.com
www.markwest.com

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