MarkWest Hydrocarbon, Inc. Invites You to Join Their Conference Call on the Web

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 [phone]

  Contact:   Valerie Lewis of MarkWest Hydrocarbon, Inc.
             [phone]



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 [phone], 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,

[phone], 



Web site:  http://www.markwest.com/

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