Even though the advent of electric cars brightens the prospect of transporting people and goods with fewer emissions, visionaries have long wanted to make use of the energy storage capabilities these vehicles possess. A pilot project at the University of Delaware may make this vision a reality. The project rebuilt several Mini Coopers so that the vehicles can stay connected to the local electrical grid when parked. Each vehicle can in turn store energy from the grid when the latter is overloaded, and the grid can take the energy back when needed. In theory, the car owner is paid for the exchange of energy. California Governor Jerry Brown alluded to such “vehicle-to-grid” technology in his latest transportation plan.