MarkWest Hydrocarbon Increases Quarterly Cash Dividend to $0.36 Per Share

  
    
  
  
    
      MarkWest Hydrocarbon, Inc. (AMEX: MWP) today announced that its Board of 
      Directors declared a cash dividend of $0.36 per share of common stock 
      for the second quarter of 2007, for an implied annual dividend rate of 
      $1.44 per share. The second quarter 2007 cash dividend represents an 
      increase of $0.04 per share, or 13 percent, over the first quarter 2007 
      dividend, and an increase of $0.12 per share, or 50 percent, over the 
      second quarter 2006 dividend. The Board of Directors declared the 
      dividend payable on August 21, 2007, to the stockholders of record as of 
      the close of business on August 9, 2007. The ex-dividend date is August 
      7, 2007.
    
    
      MarkWest Hydrocarbon, Inc. (AMEX: MWP) controls and operates MarkWest 
      Energy Partners, L.P. (NYSE: 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.
    
    
      This press release includes “forward-looking 
      statements” within the meaning of Section 27A 
      of the Securities Act of 1933, as amended, and Section 21E of the 
      Securities Exchange Act of 1934, as amended. All statements other than 
      statements of historical facts included or incorporated herein may 
      constitute forward-looking statements. Although we believe that the 
      expectations reflected in the forward-looking statements are reasonable, 
      we can give no assurance that such expectations will prove to be 
      correct. The forward-looking statements involve risks and uncertainties 
      that affect our operations, financial performance and other factors as 
      discussed in our filings with the Securities and Exchange Commission. 
      Among the factors that could cause results to differ materially are 
      those risks discussed in our Annual Report on Form 10-K for the year 
      ended December 31, 2006, and our Quarterly Reports on Form 10-Q, as 
      filed with the SEC.