For country level power usage where space and weight are less of a premium lithium ion and lithium phosphate batteries aren't really the right fit. Pumped hydro

For country level power usage where space and weight are less of a premium lithium ion and lithium phosphate batteries aren't really the right fit. Pumped hydro, molten salt,redox or even just the new sodium ion all make more sense as they are much cheaper per KW/h. Also a lot of second hand car batteries are now appearing and getting racked for grid storage uses now. I am hopefully in the next few years we won't have nearly the explosion in demand for lithium, nickel and cobalt expected as alternates are released.