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MarkWest Announces Pricing of Public Offering of Common Units

DENVER—January 11, 2011—MarkWest Energy Partners, L.P. (NYSE: MWE) announced

today that it priced a public offering of 3,000,000 common units at $41.20 per common unit.

MarkWest intends to use the net proceeds from the offering, after deducting underwriting discounts,

commissions and offering expenses, of approximately $120.1 million, as well as any proceeds from

the exercise of the underwriter’s over-allotment option, to partially fund its ongoing capital

expenditure program, including a portion of the costs associated with the previously announced

acquisition of assets from EQT Gathering, LLC if such transaction is completed. The Partnership

has granted the underwriter a 30-day option to purchase a maximum of 450,000 additional common

units to cover over-allotments, if any.

Morgan Stanley is acting as sole book-running manager for the offering. The offering is

being made only by means of a prospectus supplement and accompanying base prospectus. A

copy of the prospectus supplement and accompanying base prospectus associated with this

offering may be obtained from the underwriter as follows:

Morgan Stanley

Attn: Prospectus Dept.

180 Varick Street, 2nd Floor

New York, New York 10014

prospectus@morganstanley.com

Toll-Free: (866) 718-1649

An electronic copy of the preliminary prospectus supplement and the accompanying base

prospectus is available from the Securities and Exchange Commission's (SEC) web site at

http://www.sec.gov. The common units are being offered pursuant to an effective shelf registration

statement that the Partnership previously filed with the SEC.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy nor

shall there be any sale of these securities in any state in which such offer, solicitation, or sale would

be unlawful prior to registration or qualification under the securities laws of such state.

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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 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 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, 2009, and Quarterly Report on Form

10-Q for the quarter ended September 30, 2010. 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
or
Nancy Buese, 866-858-0482
Senior VP and CFO
or
Dan Campbell, 866-858-0482
VP of Finance & Treasurer
investorrelations@markwest.com