I'm pretty sure that the real drive behind the pro-nuclear push is and has always been about centralizing electricity "generation" (i.e. conversion); ultimately for reasons of creating authority and/or centralizing power.
Eventually solar and wind will be so inexpensive that most homes will generate and store all it needs and not require the grid. There are already roof mountable wind turbines that can be used in urban areas with no visible moving parts such as the Halcium PowerPod: https://youtu.be/vg7wW2nnrPU
there are too many government-sized subsidies all over the allegedly (but not really, not at all) free energy market. the energy market is too important to allow 'the market' to fully control it; so it's intervened with subsidies, tax-breaks, and other such kinds of influences (soft controls).
so many, and I know/understand so little about this, that I don't think it's necessarily more efficient. the centralized aspect of it (the historical norm for electrical grids) creates POWER besides the electrical.