MWP Markwest Hydrocarbon,

DENVER, May 8 /PRNewswire-FirstCall/ -- You are invited to listen to MarkWest Hydrocarbon, Inc.'s 2006 first quarter earnings conference call that will be broadcast live over the Internet on Tuesday, May 9, 2006, at 2:00 p.m. (MDT) with Frank Semple, President and Chief Executive Officer; James Ivey, Chief Financial Officer; Nancy Masten, Sr. Vice President and Chief Accounting Officer; Randy Nickerson, Sr. Vice President Corporate Development; and Andrew Schroeder, Vice President Finance and Treasurer. What: MarkWest Hydrocarbon, Inc.'s 2006 First Quarter Earnings Conference Call When: Tuesday, May 9, 2006, at 2:00 p.m. (MDT) Where: http://www.markwest.com/ How: Live over the Internet -- Simply log on to the web site address above. Live Call: Via telephone at (866) 249-6463 Contact: Valerie Lewis of MarkWest Hydrocarbon, Inc. (303) 925-9242 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 May 16, 2006 at (800) 405-2236, Passcode: 11059923#. 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: Valerie Lewis of MarkWest Hydrocarbon, Inc., +1-303-925-9242 Web site: http://www.markwest.com/

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