[olau]

This is false. Take a look at Denmark. This argument was repeated there in the past for "above X", with X being 15%, 20%, 30%, 50%.

[svantana]

Not necessarily disagreeing, but Denmark's grid is integrated with europe. If the rest of europe catches up with Denmark in wind power, that will definitely be a challenge, since wind speeds are correlated across the continent. Not unsolvable, but it's an issue for sure.