What’s wrong with nuclear energy?
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Not cost competitive with solar+batteries in many locales (less so the closer to the poles), and no learning curve, if anything a negative learning curve, nuclear never was more expensive than new nuclear.
And off course societal (and geopolitical) acceptance issues.
The cost competitiveness and societal issues make sense (though I suspect some of the cost is being externalized in terms of materials extraction and manufacturing).
I don’t understand what you mean by “no learning curve”. Do you mean that the learning curve is particularly steep for plant operators?
Its really, really, really expensive to build.
And people are (mostly irrationally) terrified of it, which matters in democracies.