Electricity use isn’t constant throughout the day or the week, so you also have to produce less. This is called load following and a good thing. Nuclear reacto

Electricity use isn’t constant throughout the day or the week, so you also have to produce less. This is called load following and a good thing. Nuclear reactors are pretty bad at it, but if you have a lot of nuclear reactors like France does you have to do it anyway, which is why France has a lower capacity factor for nuclear than other countries. For fossil-fuel- and biogas-driven plants a low capacity factor usually isn’t a big problem as fuel costs dominate. For nuclear fixed costs mostly dominate which means that a low capacity factor also means much higher costs.