The cheapest way is in-home signal and control that prevents charger and home AC from operating at same time. That way charger fills valleys, but doesn’t add to peak. And the utility gets better load factor and asset utilization of distribution grid!https://twitter.com/cubillinois/status/1028832977873199106 …
EV Charger, Heat Pumps, and other appliances should all have access to real-time data allowing them to avoid simultaneous use and thus control peak demand. Why don't utilities use "smart meters" that can provide in-home real-time data?