Still, 1MWh is the average monthly consumption of a single household. That means that for a fixed cost of less than 200$ per family we could solve intermittency

Still, 1MWh is the average monthly consumption of a single household. That means that for a fixed cost of less than 200$ per family we could solve intermittency problems by building, probably one battery per village or city block. It is cheaper than storing water to put pressure in the network. Something seems off in these numbers.