1. The electrical system was built for big power plants distributing the electricity to households. If you want to generate electricity a bit everywhere, you need to adapt the infrastructure. That's costly and it hasn't really been done at scale (whereas with nuclear plants it has).
2. With nuclear, you have great control over how much you produce. With renewables, you generally don't: you have electricity when there is wind or when there is sun. Batteries are not a solved problem at scale.
3. Renewable is cheap, but it depends on globalisation, which in turn depends on the abundance of fuel fossils. With nuclear, it's easier to have fewer dependencies. Which proportion of solar panels come from China?
4. Nuclear energy is very dense. Estimate how many solar panels you need to produce as much as a big nuclear plant, even without factoring in the batteries and the weather.