EVs can power the grid. Why aren’t more of them doing it?

When some EV owners in California and Massachusetts plug in their cars, the large batteries inside now serve a second purpose: sending power back to the grid when the vehicles do not need it and earning cash for their owners in the process. In one Massachusetts pilot program, that could mean as much as $3,000 this summer as EVs help ease strain on the grid during heat waves. It’s a use for EVs that has technically been possible for years.