Electric vehicles aren't just cars that are cleaner to operate than internal combustion dinosaurs. They're also powerful batteries on wheels. Andthat quality could spur EV owners to buy electricity at night, or operate their own solar panels or wind turbines, and store the excess energy in their cars. Then they could sell that electricity onto the grid from their parked vehicles during the day, when energy prices are highest.
The University of Delaware began working with NRG Energy in late 2011 to try to realize and commercialize that concept. Last week, the project hit a landmark: It has begun selling power from parked EVs into an energy market being developed by wholesale electricity dealer PJM.