Losing 20% of your electricity supply is a calamity, not an annoyance. So unless you want the calamity, you're still dependent on imports.
Personally, I don't see an issue with that, as long as the neighboring countries you're importing from are reliable and will be able to supply at the times you need (i.e., they don't have the same possibly spiky import dependency as yourself). The other option is massive storage capacity.
I just don't think it makes sense to just equate renewables with automatic sovereignty.
