This is already happening [1]. I think even an UK connection is in works.
reply[1] https://en.wikipedia.org/wiki/Spain-Morocco_interconnection
Northern Europe, at least Scandinavia, is already at 90%+ non carbon electricity generation. (88-100%)
replyCentral and Eastern Europe have it tougher.
Central/Eastern Europe is rather into nuclear (Austria on renewables) and not too heavy on fossil, exceptions being Poland/Czechs/Germany with too much coal.
replyThe Balkans are quite fossil-heavy, but solar should be quite feasible there.