Photos: Electric vehicles, present and future

A front view of the Volt. The car's design changed significantly from the concept car to this production version. The changes on the exterior were done to improve the aerodynamics and to ultimately improve the mileage, hitting GM's target of 40 miles on the batteries. The internal combustion engine will extend the range to "hundreds of miles," according to GM.

Photo by Martin LaMonica/CNET Networks

Caption by Martin LaMonica