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MarkWest Energy Partners Celebrates Transfer to the NYSE

MarkWest Energy Partners, L.P. (NYSE-Listed MWE) visits the NYSE to celebrate its May 2, 2007 transfer to the NYSE from AMEX. In honor of the occasion, President & CEO Frank M. Semple rings The Opening BellSM.

MarkWest Energy Partners, L.P.
MarkWest Energy Partners, L.P. (MarkWest Energy) is a master limited partnership engaged in the gathering, transportation and processing of natural gas; the transportation, fractionation and storage of natural gas liquids (NGLs), and the gathering and transportation of crude oil. MarkWest Energy is a processor of natural gas in the northeastern and southwestern United States, processing gas from the Appalachian Basin, and from East Texas, Gulf Coast and Michigan. The Company conducts its operations in three geographical areas: the Southwest, the Northeast and the Gulf Coast. On December 29, 2006, the Company acquired 100% ownership interest in Santa Fe Gathering, L.L.C. It acquired the Grimes gathering system as part of the Santa Fe acquisition. The gathering system is located in Roger Mills and Beckham Counties, Oklahoma. As of December 31, 2006, the Grimes system’s throughput was approximately 16 million cubic feet of natural gas per day.


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