State Grid Corp, the largest power company in China, demonstrated the “vehicle-to-grid (V2G)” technology, which enables to exchange electricity between an electric vehicle (EV) and a charging stand, at the Expo 2010 Shanghai China.
“By using the rechargeable batteries of electric vehicles, it becomes possible to stably oparate the electricity grid,” said Li Shu, Preparatory Department for Enterprise Pavilion of Shanghai Expo, Publicity and Promotion, Shanghai Municipal Electric Power Co, which is affiliated with State Grid.
For example, when the output from renewable energy sources such as solar power drastically drops, electricity can be supplied from several tens or hundreds of EVs to the grid to reduce the number of electric outages. Shu said that the full-fledged introduction of the V2G technology depends on the dissemination of EVs.
State Grid developed an EV rapid charger that supports the V2G technology. When an EV is connected to this charger, it automatically switches between charging and discharging in accordance with the supply and demand situation of the grid.
The EV used in the demonstration is the EV version of the Roewe 350, which was developed by Shanghai Automotive Industry Corp (SAIC).