OK so I have googled the men capacity factor and of course #nuclear has nearly 100% and #renewables only 40%.
But this just means it produces on average 40% of it's capacity. You'd need a sunny windy day to get 100%
What I've read about is a #SWB (Solar wind and battery) system with massive overcapacity
So biomass, hydro and battery can take up the slack when needed. Or gas - which has a very low mean capacity factor <10% but is usually used as a last resort