You can see on demand modulation[1], it's possible to variable 5% per minute of the full power generation of all nuclear reactors (of 60 GW). [1]: https://www.

You can see on demand modulation[1], it's possible to variable 5% per minute of the full power generation of all nuclear reactors (of 60 GW). [1]: https://www.rte-france.com/eco2mix/la-production-delectricite-par-filiere# https://www.rte-france.com/eco2mix/la-production-delectricit... look at 3 september 2018 for example, min is 36GW, max is 41GW, on one day.