Steady state nuclear power plus wind and solar would. In today’s world, make the grid more reliable and greener than ever.
Nuclear should not be off the table. It’s safe, it’s well understood, it’s reliable and is a very cheap way to create base load capacity that renewables like solos and wind can build out on top of
I'm not sure where nuclear is very cheap, but it sure isn't in the US.
Of course, given the seeming inability of the US to do any kind of large projects any more, small and decentralized is probably the only thing that will work.
France and Sweden proved Renewables+Nuclear can decarbonize your electric grid almost fully and pretty damn fast - under 20y with old tech without any automatic welding and such... With proper policies the whole planet could do something similar in much less time...
The challenge still remains decarbonizing the rest/electrification