One of the keys to maximizing renewable energy production (decentralized or otherwise) is providing electricity storage to smooth out variabilities in wind and solar power production. Electric vehicles have a lot of promise, as the cars could provide roving storage and dispatchable power to help match supply and demand.
So could a large number of EVs actually help with the huge variations in wind that can occur? According to Claus Ekman, a researcher at the Risø National Laboratory for Sustainable Energy in Frederiksborgvej, Denmark, it can, to an extent. Ekman recently published a paper in the journal Renewable Energy that modeled how well EVs could handle increasing wind power generation. He found that in a scenario involving 500,000 vehicles and 8 gigawatts of wind power, various strategies would reduce the excess, or lost, wind power by as much as 800 megawatts — enough to power more than 200,000 homes. Ekman calls this a “significant but not dramatic” effect on the grid. Scenarios involving 2.5 million vehicles and even more wind power show an even greater impact.
The U.S. currently has around 35 gigawatts of wind power, so it would take 2.1 million EVs to provide a similar effect in the U.S. (reducing the lost wind capacity by 10 percent of total installed capacity).