I casually research this topic once in a while, and so far, have not seen high temperature superconductors emerge from either the laboratory or short haul pilot projects. Is this technology close to widespread commercial use?
The technology is widespread, you can buy spools of wires and wind your own coils. A spool might still be in the range of 3k$+, probably due to the manufacturing costs of all those single wire strands. However, as we already know, the superconductivity currently starts only at low temps and I think the wires are limited by a maximum current (max field density?) If you handle the spool, NEVER lose the beginning of the…
Learned the lesson about the end of the wire with 3D printer filament.