Brooklyn-based electric vehicle charging infrastructure startup Revel on Monday launched its first fast-charging station in San Francisco, kicking off its

China's BYD has unveiled a megawatt charging system that it says can charge an EV as quickly as filling up a fuel tank, and said it will build a network across China, igniting a new super charging race.

Fast charging is viable, but experts say building the actual charging stations will be the tricky—and potentially very expensive—part.