Comment by kaliszad

Perhaps we don't need to transport electrical current in the form of electricity but rather some kind of media, perhaps sodium metal could be a good choice. We could pump liquid sodium through pipelines or just transport it by ships.

Salt (NaCl) is abundant in oceans. If you react sodium with water in a fuel cell you get NaOH, which you can again electrolytically split into sodium metal, oxygen, and hydrogen. There are ways how to extract sodium metal more efficiently than using the 130 year old basic Castner process though and there are better approaches to the fuel cell than what Lockheed imagined originally in the 1970s.