Yes, but adding refrigeration to a cable will make it firstly about thousand times more likely to need a repair, and when repairing, rather a lot less bendable

Yes, but adding refrigeration to a cable will make it firstly about thousand times more likely to need a repair, and when repairing, rather a lot less bendable and more fragile, thus making it also more difficult to repair. There are also -- of course -- a lot of political problems with the idea of a a global electric grid. Like, what happens to your electrical system in case of an international crisis. Russia has used its gas supplies for political pressure in Europe, and other nations may do the same with electricity.