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.