It is not "more sustainable". It is just, likely, cheaper. Siting, operational, and land use concerns for pumped hydro are, generally, trivial. If one site is

It is not "more sustainable". It is just, likely, cheaper. Siting, operational, and land use concerns for pumped hydro are, generally, trivial. If one site is bad, another is good. There is absolutely no shortage of sites, so only the best need be even considered.