A technology developed with the University of Delaware has sold power from electric vehicles to the power grid for the first time, the power company NRG Energy Inc said on Friday (26 April).
In a joint statement, the university and NRG said that they began work on the so-called eV2g program in September 2011 to provide a two-way interface between electric vehicles and the power grid, enabling vehicle-owners to sell electricity back to the grid while they are charging their cars.

NRG said the project became an official participant in the PJM frequency regulation market on February 27. The system, which is still in development, is not yet commercially-available.