[illiac786]

EDF has published a paper stating they can scale 80% down and then up again, every day, within 30min.

In practice, they have done something like 20% within an hour. It was early 2019, there was such a crazy wind that they had to reduce nuclear production also (after already reducing coal, gas etc. to the min).

I think what they really can do is somewhere in between.

sources, it was on l’energeek, but in French.