‘Vehicle to grid’ technology, also referred to as V2G enables energy stored in electric vehicles to be fed back into the national electricity network (or 'grid') to help supply energy at times of peak demand. Over 90% of cars are parked at any given time, which is a lot of energy just sitting inside but doing nothing. This energy can be used for balancing the grid so that there is enough electricity on the network when we all need it. This necessitates the need for having bidirectional converters in EV charging stations. Figure 5-2 shows an electric vehicle connected to a charging station where bidirectional converters inside the charging station enable the energy stored in the battery to be used for stabilizing the intermittencies in grid.

Figure 5-2 V2G Technology.