Sustainable Energy Inverters Power 6 MW Solar Tracker Project

World's Third Largest Tracker Project Inaugurated

Calgary, Alberta - December 18, 2007 - Sustainable Energy Technologies Ltd. (TSXV:

STG), www.sustainableenergy.com marked a significant milestone with the official
inauguration and commissioning of a 6 megawatt solar tracker project by Solaer S.L., near La Motilla del Palancar in the Spanish Province of Castille la Mancha.

The previously announced project - believed to be the third largest of its kind in the world -
uses more than 1,000 of Sustainable Energy's SUNERGYTM inverters to connect the solar
trackers to the power grid.
"We are very pleased with the quality and the performance of the SUNERGYTM inverters, and we intend to use them in future projects," said Gabrielle Cuartero, General Manager of Solaer S.L, one of Spain's leading solar project developers.
"This is an important milestone for Sustainable Energy" said Michael Carten President & CEO
of the Company. "It marks Sustainable Energy as a credible competitor in what is the fastest
growing major solar power market in the world."

The recent inauguration of the project was also attended by the Canadian Ambassador to
Spain as well as the Minister of Industry for Castille la Mancha, Spain's largest province, whichleads Spain in solar PV installations.

About Sustainable Energy: Based in Calgary Alberta, Sustainable Energy
(www.sustainableenergy.com) designs, manufactures and markets power inverters for therenewable energy industry. Sustainable's SUNERGY(TM) inverter delivers performance and
safety advantages for grid-connected solar power plants that are not possible with conventional inverter technologies.

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