Pumped storage is geographically limited: as more convenient sites are developed, viable locations become more and more remote. Hydroelectric storage is great, but not the pumped kind. The energy storage supplies by the Hoover dam, the Coolie dam, dwarf pumped hydro.
It's great for countries that have it, but you're not going to be storing much hydroelectricity outside of mountainous regions.
Edit: I've taken a closer look at your recent comments in other threads and it turns out you've been breaking the site guidelines so frequently and so aggressively that I've banned your account.
If you don't want to be banned, you're welcome to email hn@ycombinator.com and give us reason to believe that you'll follow the rules in the future. They're here: https://news.ycombinator.com/newsguidelines.html.
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Original post:
Would you please stop breaking the site guidelines? You've been posting tons of unsubstantive and flamebait comments and even (as here) crossing into personal attack. Besides being the sort of thing we ban accounts for, this has the disadvantage of discrediting your own view, which is a bad thing if you happen to be right.
If you'd please review https://news.ycombinator.com/newsguidelines.html and stick to the rules when posting here, we'd appreciate it. We've had to ask you about well over a dozen times in the past, which is not cool.
Edit: you've posted over 80 comments in this thread alone- most of them flamewar comments. That's extreme. Please don't do anything like that on HN again, regardless of how wrong someone else is or you feel they are.
Edit 2: you've been breaking the site guidelines badly in other threads recently too. As I said, we've warned you many times. If you keep it up we're going to have to ban you, so please fix this. It's seriously not ok.
Pumped storage requires a nearby hill with a lake on top of it (otherwise earth and concrete has to be poured to form an artificial reservoir), and a nearby lower reservoir, and a nearby source of water. And if it isn't close to transportation infrastructure, building a facility becomes prohibitively expensive. As the optimal sites are developed, less and less suitable sites need to be developed.
Why is New York building battery storage at $567/KWh [1] if pumped storage is so cheap?
There a vast amount of hydro storage potential in the Himalayas, but good luck developing any of it.
It's great for countries that have it, but you're not going to be storing much hydroelectricity outside of mountainous regions.