I think most commercial nuclear reactors require craptons of cooling water because they aren't that efficient in fact. (When you use water to regulate fission,

I think most commercial nuclear reactors require craptons of cooling water because they aren't that efficient in fact. (When you use water to regulate fission, the temperature can't get much higher than ~100C.) So, putting them in the middle of a desert might be problematic. I wonder if there's any current commercial ones that are more efficient? Theoretically we can greatly improve efficiency by using high-temperature designs, but good luck building an unproven new design of reactor these days...