MWP Markwest Hydrocarbon,

MarkWest Hydrocarbon, Inc. and MarkWest Energy Partners, L.P. Invite You To Join Their Conference Call on the Web DENVER, Feb. 24 /PRNewswire-FirstCall/ -- In conjunction with MarkWest Hydrocarbon Inc.'s and MarkWest Energy Partners, L.P.'s fourthquarter earnings release, you are invited to listen to their conference call that will be broadcast live over the Internet on Thursday, March 11, at 4 p.m. ET with Frank Semple, President & CEO; Ted Smith, Chief Accounting Officer; and Andy Schroeder, VP & Treasurer. What: MarkWest Hydrocarbon, Inc./MarkWest Energy Partners, L.P. Fourth Quarter Conference Call When: Thursday, March 11, 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. Contact: Rhonda Bowling of MarkWest Hydrocarbon, Inc., +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/ . MarkWest Hydrocarbon, Inc. (AMEX:MWP), owns and controls the general partner of, and owns a 35% limited partner interest in, MarkWest Energy Partners, L.P. (AMEX:MWE). MarkWest Energy Partners,L.P. is engaged in the gathering, transmission, processing, fractionation and marketing of hydrocarbons. MarkWest Hydrocarbon, Inc. is also engaged in the marketing of natural gas and natural gas liquids. DATASOURCE: MarkWest Hydrocarbon Inc. CONTACT: Rhonda Bowling of MarkWest Hydrocarbon, Inc., +1-303-925-9241 Web site: http://www.markwest.com/

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