“If every American switched over to an electric passenger vehicle, analysts have estimated, the United States could end up using roughly 25 percent more electricity than it does today. To handle that, utilities will likely need to build a lot of new power plants and upgrade their transmission networks.
“There’s no question that utilities can do this, but it’s not going to be trivial,” said Chris Nelder, who leads the vehicle-grid integration team at the Rocky Mountain Institute. “It takes time and money.” In a recent study, his team found that many utilities and vehicle fleet managers planning to go electric have yet to fully grapple with all the challenges involved.”
Electric Cars Are Coming, and Fast. Is the Nation’s Grid Up to It? - The New York Times