The problem is that a nuclear plant is extremely high CAPEX and acceptable OPEX.

Halving the output essentially means doubling the price.

For Vogtle halving the expected capacity factor means the generated electricity now costs a completely stupid 40 cents per kWh or $400 per MWh.

I agree with that, I have just seen on here before that people think you can't regulate the electrical output of a nuclear plant like with more traditional ones.