Interesting real world data, on 1GW firm power supply.
Masdar UAE - solar + batteries.
Cost USD 6 billion.
Construction time 2 years (caveat, not sure if this is a tranche or all of it)
Hualong One
Cost USD 3 billion (from actuals)
construction time 5 years
So purely on construction cost, large scale firm solar is twice the price of Chinese nuclear.
Note, fuel, op costs, water needs, llife time, site cleanup etc not accounted for.