I guess you are unaware that we already have 9,000 GWh / 160 GW of grid storage already deployed around the world? And that we started building it in the mid 1890s? And that most of it was built to provide grid resiliency for nuclear, and the rest for major coal plants?

And that there 100 times the global need for storage in closed-loop pumped hydro storage locations off rivers and streams, near transmission and not on protected lands?

https://www.anu.edu.au/news/all-news/anu-finds-530000-potential-pumped-hydro-sites-worldwide

http://re100.eng.anu.edu.au/global/

Storage is a solved problem. Redox flow batteries and lithium will take care of what pumped hydro won't. The market will take care of which is better.

Sorry to burst your bubble.