We do have nuclear power for some cities – that’s what a nuclear power plant does.
Having a household reactor would be extremely difficult and dangerous.
It’s also difficult and dangerous in military ships/submarines, but it’s worth it for the advantages (unlimited range, etc.). A nuclear sub can afford the specialized crew.
And nuclear powered satellites are a totally different system – it’s more like a nuclear battery that provides a low level of consistent power for a very long time. Even those are only used when other options (like solar panels) won’t work.
Nuclear power plants for cities were actually the first things developed. It currently provides around 10% of all electricity in the world.
For many years nuclear was the go-to method of electricity. Hell France was almost completely powered by nuclear until quite recently. The favorability of nuclear power has lessened considerably over the last few decades and especially after several nuclear incidents such as Three Mile Island (US), Chernobyl (USSR), and Fukishima (Japan)
It takes a huge amount of capital to build and operates a nuclear plant. The average homeowner or small city does not have the right operational knowledge, capital, or ability to deal with waste. Most baseload nuclear plants are profitable because they operate at scale. The military rarely faces the same economic limitations.
That said, there are promising small scale nuclear plants being developed that might work out at the city or light industrial scale.
Another issue regulatory in that any broad use of small-scale nuclear power generation would have to come with security considerations. By its nature, the military can secure its own projects.
the average homeowner might not be able to.
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