Description:Luxury cars with green hearts. At the Detroit auto show carmakers show off the newest generation of electric cars, confirming that battery power is here to stay. Cadillac enters the game with the new ELR. It features an all-electric driving range before a gasoline engine kicks in. With a total of 207 horsepower, the ELR will travel up to 35 miles on electric power only, and a total range of more than 300 miles.(3:12)