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Tech Valley News Ener-G-Rotors Wins Cleantech Award Ener-G-Rotors Inc., which is commercializing devices that turn low temperature heat into electricity, won the award for Most Promising Technology from the Cleantech Group LLC, at its annual awards event in San Francisco. Cleantech is an investment firm in clean technology. Ener-G-Rotors creates cost-effective solutions through its patented Trochoidal Gear Engine that turns low temperature heat (150°F to 400°F) into electricity at the 0.5kW to 50kW size range and can be used in a variety of applications from industrial waste heat to commercial buildings to off-grid HVAC.