Hydro also fits the bill, mostly, and when there's not enough water in your river for hydro, well the nuclear plant's also got to respect heat-emission norms...
Not really, hydro does a lot of damage to ecosystems, blocks fish migration and can be weaponized (like it was in Ukraine during WW2 and earlier this year). And when it comes to greenhouse emissions it takes many years to offset carbon from decaying matter when a new reservoir is built.