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Why calculate when we have lots of empirical data? There are plenty of grids around the world are deriving 40% of their energy from wind and/or solar. Up to 65% is relatively easily accommodated according to grid engineering orthodoxy with current typical infrastructure/tech.

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Intermittent energy. Doesn’t work well for manufacturing at all. Your argument, without nuclear, is an argument for natural gas and coal.

Industrials need steady power to function. Without nuclear, the world is going to just use natural gas. Coal for poorer countries. Solar and wind peppered in but not trusted for any base load and regionally limited.

Doesn't this mostly happen in counties like Denmark where it's relatively easy to buy / sell energy to the grids of neighboring countries?

This would work well in denser-populated parts of the US, like northeast, and would be harder in Midwest.

HVDC will handle moving energy on continental scales. China makes power in northwest inner parts and moves it thousands of kms to the coast for consumption.

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