How much is too much investment in nuclear energy?
Sizewell C, budgeted in 2020 at £20bn has now been costed at £38bn (a near doubling in cost) in five years.
Given much of this will be funded via loans underwritten by income from energy bill-payers, we might well ask if that money might be better spent on other forms of energy (and the necessary storage capacity for renewables).
If you think that is it for cost increases, experience tells us it wont be!