"the planned development around the North Sea means 100 GW (100 large power stations) would need to be turned on or off to balance out changes in wind power production when the weather changes. With a more cooperatively designed system, this could be reduced to just 20 GW across the continent.". Add solar, biomass... and storage, including a smartgrid enabling (for example) V2G:
https://en.wikipedia.org/wiki/Vehicle-to-grid , then green hydrogen (boosting production units' output and reducing the amount of electric electricity needed).