This whole article illustrates a huge benefit of solar over nuclear: if you deploy 90% of the required solar panels, you get 90% of the energy, while if you build 90% of a nuclear plant, you get nothing. The power of incremental deployment.
But, a solar plant with a nameplate capacity of 1GW is roughly 15-17x cheaper than a 1GW nuclear plant and starts chipping away at gas and coal usage almost straight away, not in 15-20 years.