This is the actual plan for renewables, because they are just cheap period (though their fuel is pretty darn cheap too). Demand response, simply dumping the excess, storing excess as heat etc.

It's not a good idea for nuclear, because even nuclear that runs all the time can't compete on cost with renewables and any deviation from that schedule destroys the economics conpletely.

A small amount that runs all the time is probably a good idea in places far from the equator, but even then the plummeting costs of renewables opens a few other doors, like shipping green hydrogen around.