UBS Global Alternative Energy Conference Runs May 14-15 in New York.

NEW YORK -- UBS:

WHAT:      The UBS Global Alternative Energy Conference is an
           opportunity to meet executives from leading companies in
           the sector. The conference is one of the largest and most
           global of its kind and will feature presentations by over
           30 top executives from public and private companies in the
           solar, biofuels, wind, clean coal, hybrid vehicle and
           nuclear sectors. Keynote speakers will address key
           technological, regulatory and competitive issues that will
           shape the industry over the next several years.

  Presenting companies include:
  Active Power
  Aventine Renewable Energy             Moser Baer
  Babcock & Brown Wind Partners         Motech Industries
  Ballard Power Systems                 Pacific Ethanol
  Carmanah Technologies                 Plug Power
  Conergy AG (EPURON LLC)               Rentech
  Distributed Energy Systems            REC Group
  Celunol Corp. (merging with Diversa)  Sasol
  DKRW Energy                           Solarfun Power Holdings
  Dynamotive Energy Systems             Solel
  Energy Conversion Devices             SunPower
  FuelCell Energy                       US BioEnergy
  Fuel Tech                             USEC
  Hydrogenics                           VERBIO Vereinigte BioEnergie
  ISE Corporation                       Woodland Chemical Systems
  Marine Current Turbines               Xantrex Technology
  Mascoma
  Maxwell Technologies
  Medis Technologies
  Marine Current Turbines
    Keynote speakers:

  - Monday, May 14: Michael Ware, Good Energies. Michael Ware is a
    Managing Director at Good Energies, one of the largest investors
    in alternative energy in the world with in excess of EUR 3 billion
    invested in public and private solar and wind companies. Michael
    is also a founder and board member of the American Council for
    Renewable Energy, the alternative energy industries prominent
    trade group. Michael will speak about recent investment themes in
    the alternative energy market.
  - Tuesday, May 15: Representative Roscoe Bartlett, co-founder and
    co-chairman of the Congressional Peak Oil Caucus and the Defense
    Energy Working Group. Rep. Bartlett will speak about the necessary
    transition from fossil fuels to alternative, renewable sources of
    energy in order to combat the issues of global peak oil, global
    warming and the threat to U.S. national and economic security from
    increasing dependence upon imported oil. Rep. Bartlett will also
    provide an overview of the current legislative initiatives
    impacting alternative energy companies.

WHY:       High conventional energy prices, technological advances and
           government support are driving tremendous growth in the
           alternative energy sector. With this growth comes new
           investment opportunities and challenges. Understanding the
           global landscape is critical to identifying tomorrow's
           winning companies today

WHEN:      May 14-15, 2007

WHERE:     Grand Hyatt New York
           Park Avenue at Grand Central
           New York City

WEBCAST:   Live audio transmissions of company presentations will be
           accessible via the UBS Investment Bank website at
           www.ibb.ubs.com when the conference opens. Replays will be
           available starting approximately three hours after the
           initial presentation and will remain accessible for up to
           four weeks.

REGISTER:  Accredited members of the media may register for the
           conference by contacting Kris Kagel at [e-mail]
           or [phone].