The city of Essen, Germany has just switched on the world’s longest superconducting cable, more than a kilometer from end to end, and hopes to be a model for similar projects the world over. The cable connects two large transformer stations in the heart of the city — and though it is larger than any one traditional copper cable, it can also carry five times as much power. The real advantage, of course, stems from the fact that a superconducting cable uses advanced materials to effectively eliminate inefficiency in power transmission and distribution (T&D). This is a big, big deal that could save hundreds of billions of dollars in transmission losses if these superconducting cables were implemented across the world’s power grids.I can't figure out why we haven't done this in the US yet.
Here's a youtube video they put out: