Affordability is always relative. Australia can't afford that much battery storage, it has to spend $368bn on nuclear submarines. /s
(did you mean 20kwh per user, or 20GW overall?)
The submarines will be in port so much of the time, we may as well hook up their nukes to power the grid.
The submarines will be in port so much of the time, we may as well hook up their nukes to power the grid.