Interestingly, it’s also becoming somewhat common to dam off (concrete-fence-off?) the entire top of a hill somewhere for pumped hydro. Essentially the opposite of what you’d do for a hydropower installation.
Also, pumped storage tends to be smaller, in that it’s meant to provide a certain level of discharge for hours or days. So the reservoirs can be a lot smaller.
It also makes a lot more sites interesting.
[https://www.sciencedirect.com/science/article/pii/S254243512...]