[bayesian_horse]

Nuclear power projects are not just over-budget, they start off with a budget of a couple of billions, whereas individual solar or wind power projects are way smaller and therefor carry less of a risk. Nuclear power requires a huge financial backing from a single entity (even it is "fed" by multiple sources). Almost always, the risk is carried by society, the profit, if any is gobbled up by some corporation.

There is no need to "overbuild" wind or solar. There has never been any illusion those sources will produce at 100% capacity all the time. There will eventually be energy storage to level out the peaks, but most countries still have years to build up to the point where this is necessary.