CEO of Clean Energy Presenting at National Natural Gas Vehicle Conference

   WHAT:   "Keeping the Pedal to the Floor: Driving Home Our Natural Gas
           Mileage"

           Andrew Littlefair will present as the closing speaker at this
           year's National Natural Gas Vehicle Conference & Exhibition.

           Development of the NGV market has taken years of industry
           commitment, innovation and resolve.  Mr. Littlefair will discuss
           how the outlook for growth is strong as the public becomes more
           familiar with NGV benefits.  He will also discuss recent
           challenges facing the NGV market such as Ford Motor Company's
           quiet and unanticipated decision to halt their domestic
           production of NGVs.

   WHO:    Andrew Littlefair, Chairman, Natural Gas Vehicle Coalition and
           President and CEO, Clean Energy
           Mr. Littlefair is credited with developing a number of the early
           successful models instrumental in switching fleets to natural gas
           while simultaneously building economically viable stations.

   WHEN:   Tuesday, September 21, 2004
           11:00 a.m.

   WHERE:  Henry B. Gonzalez Convention Center
           200 E. Market Street
           San Antonio, Texas
           Ballroom B

  CONTACT: Kirsten Berry, +1-512-432-1802, for Clean Energy.

PRNewswire -- Sept. 20