Electric cars could act as batteries for the energy grid

http://environment.newscientist.com/channel/earth/energy-fuels/dn100-electric-cars-could-act-as-batteries-for-the-energy-grid-.html

Electric and hybrid cars could act as energy stores for the power grid while not being driven.

Scientists at the University of Delaware have been studing a new prototype made by AC Propulsion to store grid electricity when required. Combustion-powered cars are useless while off the road, but all-electric and plug-in hybrid vehicles could act as backups to the grid while idle, using a system developed by Kempton and colleagues called V2G (vehicle-to-grid).