AC Power transmission is not efficient over long distances without rectification. HVDC Power transmission already has links >1500km onshore. Offshore links are

AC Power transmission is not efficient over long distances without rectification. HVDC Power transmission already has links >1500km onshore. Offshore links are more expensive to build but I don’t think there are massive difference in losses (to the point where they are not worth building anyway). European countries are already connected by subsea HVDC links 500km long. There is a planned cable between Iceland and the U.K. the costs of construction are offset against currently wasted generation, so they can be built at a comparable cost to modern renewable energy, and then they open up an energy trading market that will add to the money made through generation.