So called vehicle-to-grid (V2G) technology is a connection between the EV and the grid through which power can flow from the grid to the vehicle and vice-versa, potentially enabling car owners to sell energy to the network. This would allow utilities to use electric cars as a backstop if demand rises.
There will be 280 million electric vehicles by 2040, according to estimates by the International Energy Agency, compared with more than 3 million last year.
