[sourdoughness]

We have a low-tech version of something like this in South Australia: we pay the wholesale rate for electricity, which updates at 5 minute intervals. During the day when there’s oversupply of wind and solar, the rate is super low or even negative, which we take advantage of to charge an EV (and we’ll be adding a home battery soon).

The power company can integrate with car chargers and battery controllers to control all of this automatically, though we don’t bother - just check the app for the cheapest/greenest times and schedule the car to charge then.

It’s allowed us to switch to an EV without even really noticing any extra power cost for charging it.