It's slithly better the more dense the material, but that's basically the same thing. You could say that depending on the location, using water is much more practical.

A much more interesting one I saw was the molten salt ones, where basically you store the energy as heat in a sealed place, and then when you need it, you use that heat to run turbines.

[–] amelore 3 points 5 months ago* (last edited 5 months ago)

Yes, suspended weights, also spinning flywheels, hot salt, hot sand
There's options besides pumped hydro, hydrogen and batteries

[–] capital@lemmy.world 1 points 5 months ago

I don’t think it’s feasible.

https://youtu.be/XxGQgAr4OCo

[–] shaman1093@lemmy.ml 1 points 5 months ago

Interesting concept, thanks for sharing