I forget what country was trying to build a bunch of these but an article popped up on here about this a while back and they cited lack of suitable locations as one of the main barriers for building more.

The most ideal locations are natural that require minimal land reshaping. Some places in the world have a lot of suitable locations like that. Others don’t.

But despite that it still seems much more feasible to build lots of hydro pump stations like that than it does to build other forms of battery farms.