Thomas Weisel Partners (TWPG) will host its Annual Alternative Energy Conference, June 12 at the Mandarin Oriental Hotel in New York. Institutional investors and company management will gather for this one-day conference which will focus on opportunities and challenges in the Alternative Energy industry in 2008 and beyond.

ADA-ES Inc.                             Lehigh Technologies
American Superconductor Corporation     Mascoma Corporation
Amtech Systems, Inc.                    Metabolix, Inc.
Ballard Power Systems, Inc.             Metalico, Inc.
BTU International, Inc.                 Microfield Group, Inc.
Composite Technology Corporation        Orion Energy Systems, Inc.
Comverge, Inc.                          Plug Power Inc.
ConsumerPowerline                       PowerSecure International, Inc.
Echelon Corporation                     Renewable Energy Group, Inc.
EnerNOC, Inc.                           Solar Integrated Technologies, Inc.
Evergreen Solar, Inc.                   SunPower Corporation
Fuel Tech, Inc.                         Suntech Power Holdings Co., Ltd.
FuelCell Energy, Inc.                   VeraSun Energy Corporation
GreatPoint Energy                       Virent Energy Systems, Inc.
GreenHunter Energy, Inc.                Westport Innovations Inc.
groSolar                                Xunlight Corporation
Hoku Scientific, Inc.                   Ze-Gen
ISE Corporation

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Thomas Weisel Partners (TWPG)

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Thomas Weisel Partners Group, Inc. is an investment bank, founded in 1998, focused principally on the growth sectors of the economy. Thomas Weisel Partners Group, Inc. generates revenues from three principal sources: investment banking, brokerage and asset management. The investment banking group is comprised of two disciplines: corporate finance and strategic advisory. The brokerage group provides equity and convertible debt securities sales and trading services to institutional investors, and offers brokerage, advisory and cash management services to high-net-worth individuals and corporate clients. The asset management group consists of: private equity, public equity and distribution management. Thomas Weisel Partners is headquartered in San Francisco with additional offices in Baltimore, Boston, Calgary, Chicago, Cleveland, Denver, New York, Portland, Silicon Valley, Toronto, London, Mumbai and Zurich.