>I think I read that once you get to like 40%, you need to spend a lot more on storage.
You can get pretty high before the economics get sketchy. Below analysis concluded that for many sunny places that point is in the 90%+. Most of EU will be lower than said sunny places, but point is it's not 40%. And the sprinkling of wind, nuclear, geo, hydro means there is a fair bit of room to still push.
Plus both solar and storage tech is still moving rapidly
You can get pretty high before the economics get sketchy. Below analysis concluded that for many sunny places that point is in the 90%+. Most of EU will be lower than said sunny places, but point is it's not 40%. And the sprinkling of wind, nuclear, geo, hydro means there is a fair bit of room to still push.
Plus both solar and storage tech is still moving rapidly
https://ember-energy.org/app/uploads/2025/06/Ember-24-Hour-S...