Or they could use EVs. Require cars to have V2X (Vehicle to Grid, Vehicle to Load) feature. EV batteries are humongous.
Lightnings do (well before they were discontinued)But given they are NMC chemistry, you probably wouldn't want to cycle them a lot for the grid (or just your home).
You wouldn't have to, to nevertheless provide great benefit to the grid. Look up "TOU billing".
thelastgallon · · focus · HN ↗
jethronethro · · focus · HN ↗
WarmWash · · focus · HN ↗
But given they are NMC chemistry, you probably wouldn't want to cycle them a lot for the grid (or just your home).
everybodyknows · · focus · HN ↗