Hydro is the best option next to nuclear (more dangerous as accidents can and do kill thousands but potentially cheaper), but the number of feasible sites is ra

Hydro is the best option next to nuclear (more dangerous as accidents can and do kill thousands but potentially cheaper), but the number of feasible sites is rather limited - mountains with river canyons that are not used otherwise and can be dammed are probably all dammed already and have been for half a century...