MWP Markwest Hydrocarbon,

MarkWest Hydrocarbon, Inc. and MarkWest Energy Partners, L.P. Invite You to Join Their Conference Call on the Web DENVER, Oct. 29 /PRNewswire-FirstCall/ -- In conjunction with MarkWest Hydrocarbon Inc.'s and MarkWest Energy Partners, L.P.'s third quarter earnings release, you are invited to listen to their conference call that will be broadcast live over the Internet on Wednesday, November 5, at 4 p.m. ET with John Fox, CEO; Frank Semple, President; and Don Heppermann, Chief Financial Officer. What: MarkWest Hydrocarbon, Inc./MarkWest Energy Partners, L.P. Third Quarter Conference Call When: Wednesday, November 5, 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: Anita Blackman 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), operates in two business segments: midstream services, and exploration and production of natural gas. In the midstream services segment, which is principally conducted through our 45 percent-owned affiliate, MarkWest Energy Partners, L.P. (AMEX:MWE), we gather natural gas from the wellhead and process the natural gas to remove impurities and the valuable natural gas liquids (NGLs). MarkWest Hydrocarbon markets the NGLs. MarkWest Energy Partners, L.P., owns processing assets in Appalachia and gathering systems and lateral pipelines in Texas, New Mexico, Louisiana and Mississippi. The exploration and production segment produces natural gas in Alberta, Canada, and in Michigan. DATASOURCE: MarkWest Hydrocarbon, Inc.; MarkWest Energy Partners, L.P. CONTACT: Anita Blackman of MarkWest Hydrocarbon, Inc., +1-303-925-9241 Web site: http://www.markwest.com/

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