Not quite in the usable temp for engineering yet but definitely on the right path. And a wee bit less sketchy than the last one. That combine with the progress is fusion reactors. We have a bright future in energy ahead of us (but pretty grim everywhere else)

Loads of things superconduct below 10K - aluminium for one. This is for a different type of superconductor that can be turned on and off with a magnetic field.