[hydrox24]

If people are interested in pumped hydro, Andrew Blakers et. al. from ANU have put together a global atlas of potential pumped hydro sites. They've got greenfield, brownfield, etc.

https://re100.eng.anu.edu.au/pumped_hydro_atlas/

[unwind]

That is already mentioned, in the fifth paragraph of the posted Wikipedia page (reference 8).