Of course there will be no source, but just FUD, so I had to look it up myself. https://energiforskmedia.blob.core.windows.net/media/18663/henriksson.pdf https

Of course there will be no source, but just FUD, so I had to look it up myself. https://energiforskmedia.blob.core.windows.net/media/18663/henriksson.pdf https://energiforskmedia.blob.core.windows.net/media/18663/h... --- start quote --- Additional Costs for Load-following Nuclear Power Plants. Experiences from Swedish, Finnish, German, and French nuclear power plants The conclusion from this report is that with a well-prepared load-following, there are very few additional costs... It is concluded that if the load-following is planned and the regulation is done within determined levels specific for the plant there is no hindrance or addi- tional costs for load-following. <Summarising: the actual cost is minimal, but may affect the resulting MWh price because nuclear power plants have high fixed costs and low variable costs.> --- end quote ---