You make the same mistake fission boosters make. Converting heat to electricity is expensive. Solar and wind skip the expensive step, going straight to electricity. Electric power from solar and wind is already much cheaper than coal, without subsidy, for this reason, and because coal has to be dug up and transported. Coal has a high operating cost. Solar and wind have extremely low operating cost, and also very low capital cost, always falling.
Solar and wind, un-subsidized, are the cheapest power the world has ever seen, and their cost is still falling at exponential rate.
Solar and wind, un-subsidized, are the cheapest power the world has ever seen, and their cost is still falling at exponential rate.