Spreading out production units (mainly wind turbines) and mixing sources (wind, solar...) considerably lowers the burden of intermittency.

LCOE is pertinent because the very low total cost of electricity generated by renewables spares money, enabling investments needed to compensate intermittency (over-provisionning, storage...).

Not a single industrial breeder reactor works satisfactorily (after many decades of R&D backed by huge investments in nations).