Pumped hydro is not, in fact, "highly location dependent". It needs a hill, but there are many millions of hills. Storage does not need any "breakthroughs". It

Pumped hydro is not, in fact, "highly location dependent". It needs a hill, but there are many millions of hills. Storage does not need any "breakthroughs". It will be built out when there is renewable generating capacity to charge it from. In the meantime, NG plants fill shortfalls.