>>"The simplest energy storage solution is your hot water heater. Turning on everyone's hot water heater when there is surplus electricity," I already do this

>>"The simplest energy storage solution is your hot water heater. Turning on everyone's hot water heater when there is surplus electricity," I already do this manually. I unplug it before taking a shower and plug it again at night. Of course, doing it automatically is the only way is going to be done at scale.