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I'm not entirely sure what you mean by 90%. 90% of what?

You can't just have 90% of power generated by renewables and 10% by fossil fuels because there are times when you get 0% from renewables and so your fossil fuel plants need to provide 100% of the power. So you spent all that money on renewable infrastructure and didn't even get the benefit of shuttering your fossil fuel plants.

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90% of power generation on average.

What you've written here isn't persuasive. Are you trying to say that keeping gas peaker plants as a backup will mean renewables are more expensive than nuclear? Where is your analysis that fleshes that out?

Especially when a simply cycle turbine plant has a capital cost per kW maybe 5% that of a nuclear plant.

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