MWP Markwest Hydrocarbon,

MarkWest Energy Partners, L.P. and MarkWest Hydrocarbon, Inc. Invite You to Join Their Conference Call on the Web DENVER, July 8 /PRNewswire-FirstCall/ -- MarkWest Energy Partners, L.P. (AMEX:MWE) in conjunction with MarkWest Hydrocarbon, Inc. (AMEX:MWP), is pleased to announce that a conference call will be broadcast live over the Internet on Monday, July 12, 2004, at 4 P.M. ET with Frank Semple, President & CEO; Jim Ivey, Chief Financial Officer; Randy Nickerson, SVP Corporate Development and Andy Schroeder, VP Finance & Treasurer. What: MarkWest Energy Partners, L.P. Announces Intent to Acquire East Texas Gathering and Processing System from American Central East Texas Gas Company, L.P. When: Monday, July 12, 2004, at 4 P.M. ET Where: http://www.markwest.com/ How: Live over the Internet -- Simply log on to the web site address above. The dial in number for the conference call is 1-800-589-4298. The confirmation number is 531315. Contact: Rhonda Bowling of MarkWest Energy Partners, L.P., +1-303-925-9241 If you are unable to participate during the live webcast, the call will be archived on the Web site above. The call will also be archived on http://www.prnewswire.com/. Additionally, a replay of the call will be available at 888-203-1112, confirmation number 531315. MarkWest Energy Partners L.P. is a publicly traded master limited partnership with a solid core of midstream assets and growing core of gas transmission assets. It is the largest processor of natural gas in the Northeast, processing gas from the Appalachian basin and from Michigan. Its Northeast assets include natural gas processing facilities, liquids fractionation, transportation and storage facilities. It also has a growing asset base of gas gathering and intrastate gas transmission assets in the Southwest, primarily in Texas and Oklahoma. DATASOURCE: MarkWest Energy Partners, L.P. CONTACT: Rhonda Bowling of MarkWest Energy Partners, L.P., +1-303-925-9241 Web site: http://www.markwest.com/

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