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MarkWest Energy Partners Announces Extension of Senior Notes Exchange Offer
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DENVER-February 23, 2007- MarkWest Energy Partners, L.P. (AMEX: MWE) announced today that it has extended to 5:00 p.m., Eastern Time, on February 26, 2007, its offer to exchange its 8 1/2% Senior Notes due 2016 that have been registered under the Securities Act of 1933 for any and all of its outstanding 8 1/2% Senior Notes due 2016 that were issued on July 6, 2006 and October 20, 2006 in private offerings. The exchange offer had been scheduled to expire at 5:00 p.m., Eastern Time, on February 22, 2007. As of 5:00 p.m., Eastern Time, on February 20, 2007, approximately $274.9 million in aggregate principal amount of notes (out of $275.0 million aggregate principal amount outstanding) had been tendered in the exchange offer.

This press release shall not constitute an offer to purchase or exchange nor the solicitation of an offer to exchange any securities. The exchange offer is being made solely by a prospectus dated January 23, 2007 of MarkWest Energy Partners, L.P. and MarkWest Energy Finance Corporation, including any supplements thereto, and is subject to certain conditions specified therein.

For additional information about the exchange offer, including requests for assistance or copies of the prospectus referred to above, contact the Exchange Agent, Wells Fargo Bank, National Association, Corporate Trust Operations, Sixth and Marquette, MAC N9303-121, Minneapolis, Minnesota 55479; telephone: (800) 344-5128.

Holders of notes who do not tender before 5:00 p.m., Eastern Time, on February 26, 2007, will continue to hold unregistered securities and will have no right to compel the registration of their notes under the Securities Act of 1933.


MarkWest Energy Partners, L.P. is a publicly traded master limited partnership with a solid core of midstream assets and a growing core of gas transmission assets. It is the largest processor of natural gas in the Northeast and is the largest gas gatherer of natural gas in the prolific Carthage field in east Texas. It also has a growing number of other gas gathering and intrastate gas transmission assets in the Southwest, primarily in Texas and Oklahoma.

This press release includes "forward-looking statements." All statements other than statements of historical facts included or incorporated herein may constitute forward-looking statements. Although we believe that the expectations reflected in the forward-looking statements are reasonable, we can give no assurance that such expectations will prove to be correct. The forward-looking statements involve risks and uncertainties that affect our operations, financial performance and other factors as discussed in our filings with the Securities and Exchange Commission. Among the factors that could cause results to differ materially are those risks discussed in our Form 10-K for the year ended December 31, 2005, as amended and our Forms 10-Q, as amended, as filed with the SEC.

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