MWP Markwest Hydrocarbon,

DENVER, Oct. 17 /PRNewswire-FirstCall/ -- You are invited to listen to MarkWest Hydrocarbon, Inc.'s (AMEX:MWP) 2006 third quarter earnings conference call that will be broadcast live over the Internet on Wednesday, November 8, 2006, at 4:00 p.m. (ET) with Frank Semple, President and Chief Executive Officer; Nancy (Masten) Buese, acting Chief Financial Officer; Randy Nickerson, Sr. Vice President and Chief Commercial Officer; and Andrew Schroeder, Vice President Finance and Treasurer. WHAT: MarkWest Hydrocarbon, Inc.'s 2006 Third Quarter Earnings Conference Call WHEN: Wednesday, November 8, 2006, at 4:00 p.m. (ET) WHERE: http://www.markwest.com/ HOW: Live over the Internet -- Simply log on to the web site address above. LIVE CALL: Via telephone at (800) 218-0713 CONTACT: Valerie Lewis of MarkWest Hydrocarbon, Inc. (866) 858-0482 If you are unable to participate during the live Webcast, the call will be archived on the website above. Alternatively, a replay will be available through November 15, 2006 at (800) 405-2236, Passcode: 11074131#. The call will also be archived on http://www.prnewswire.com/. MarkWest Hydrocarbon, Inc. (AMEX:MWP) controls and operates MarkWest Energy Partners, L.P. (AMEX:MWE), a publicly traded limited partnership engaged in the gathering, processing and transmission of natural gas; the transportation, fractionation and storage of natural gas liquids; and the gathering and transportation of crude oil. We also market natural gas and NGLs. DATASOURCE: MarkWest Hydrocarbon, Inc. CONTACT: Frank Semple, President & CEO, or Andy Schroeder, VP Finance & Treasurer, both of MarkWest Hydrocarbon, Inc., +1-866-858-0482, fax +1-303-290-8769, Web site: http://www.markwest.com/

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