What I am talking about is hydro-pump-storage.
That type of storage has no dam that could fail – you take two lakes, one higher than the other, connect them with a tunnel, and place a turbine in the tunnel. Now you can push the water up (store energy) or let it flow down (produce energy).
However, it is simply not true that hydro-pump storage never has a dam.
See: https://en.wikipedia.org/wiki/Pumped-storage_hydroelectricit...
https://en.wikipedia.org/wiki/Ffestiniog_Power_Station
In fact, when you look at the list of pumped storage stations, the vast majority of them have dams:
https://en.wikipedia.org/wiki/List_of_pumped-storage_hydroel...
What I am talking about is hydro-pump-storage.
That type of storage has no dam that could fail – you take two lakes, one higher than the other, connect them with a tunnel, and place a turbine in the tunnel. Now you can push the water up (store energy) or let it flow down (produce energy).