Could be done, question is the cost (and possibly global production of superconductors: I hear recent increases in fusion experiments are due to a recent increase in superconductor availability, but that in turn implies global production is pretty low). There is a plan for a 5 GW superconducting connection, but AFAIK the ones which have actually been built are in the megawatt range: https://en.m.wikipedia.org/wiki/Tres_Amigas_SuperStation