Let’s keep it simple and assume we has a really awesome superconductor: critical temperature of 100C (so it keeps superconducting even if it gets decently hot),

Let’s keep it simple and assume we has a really awesome superconductor: critical temperature of 100C (so it keeps superconducting even if it gets decently hot), a high critical field (so you can make electromagnets and such out of it), good mechanical properties so it makes nice wire, and cheap. It would be awesome. Off the top of my head: Big electromagnets would use it: MRI machines, magnetic plasma machines (fusion reactors), industrial magnets (for lifting), etc. A lot of the size and complexity of some MRI machines is the cooling system for the magnets — this would be unnecessary. There are designs for superconducting transformers that could be smaller and more efficient than current transformers. Long distance power transmission would be considerably cheaper at high power levels. I can imagine that some interesting motor and generator designs would become possible.