Because coal is fucking nasty. Natural gas heating became commonplace in my city in the late 1990s. Before that the city was heated with coal. There was soot everywhere. It fucking sucks. And that soot is also often radioactive. Health wise you're way better off living near a nuclear plant than a coal plant.
Gas is great but there isn't quite as much of it. Not that there is infinite coal either, but there is effectively infinite nuclear fuel.
your energy supply should match the structure of your society
nuclear is regulated and ordered, not chaotic
Because coal is fucking nasty. Natural gas heating became commonplace in my city in the late 1990s. Before that the city was heated with coal. There was soot everywhere. It fucking sucks. And that soot is also often radioactive. Health wise you're way better off living near a nuclear plant than a coal plant.
Gas is great but there isn't quite as much of it. Not that there is infinite coal either, but there is effectively infinite nuclear fuel.