MWP Markwest Hydrocarbon,

DENVER, March 5 /PRNewswire-FirstCall/ -- You are invited to listen to MarkWest Hydrocarbon, Inc.'s 2006 fourth quarter earnings conference call that will be broadcast live over the Internet on Tuesday, March 6, 2007, at 4:00 p.m. (EST) with Frank Semple, President and Chief Executive Officer; Nancy Buese, 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 Fourth Quarter Earnings Conference Call When: Tuesday, March 6, 2007, at 4:00 p.m. (EST) 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 March 13, 2007 at (800) 405-2236, Passcode: 11084450#. 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., 866-858-0482, Fax, +1-303-290-8769, Web site: http://www.markwest.com/

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