GM's series hybrid electric power train took Best Green Engine
in the International Engine Awards. This power train, which appears in both the Opel Ampera and Chevy Volt
, relies primarily on a 111-kilowatt electric motor to drive the front wheels. That motor gets electricity from a 16-kilowatt-hour battery pack. An onboard 1.4-liter gasoline engine works as an electrical generator when the power is depleted.