Nukes and geothermal both depend on steam turbines, which are down for very expensive maintenance 10-20% of the time. That is why those can't compete with 0% opex renewables + storage.

Nukes, of course, have lots of other opex on top of the turbines, and also crippling capex.

Geothermal might be able to compete at very high latitudes where the alternative is shipping in synthetic ammonia from the tropics when wind flags and transmission lines don't deliver.

But steam turbine s are absolutely not getting any cheaper or more reliable.