What happens when there is wide bad weather for renewables? ( for a range of days from 1 - several) Where would the power needed come from?
If, it was to be from some kind of storage, Extra capacity would be needed to allow recharging of the storage
Wind and solar power are remarkably stable in Europe. Last year, the average weekly electricity output was 14.0TWh; not a single week fell below 10.5 TWh.
Weather fronts move across the continent on a very regular basis; when the wind dies down, the sun shines more.
Bad weather often comes with wind or rain.
Obviously it’s possible for solar, hydro and wind farms to stop producing, but that’s what storage is for.
Mind that nuclear power relies on favorable weather as well. It's not uncommon in Europe that nuclear power plants have to shut down, because the rivers they use for cooling become too hot.