High Temperature Semiconductor progress announcement – 20 Tesla magnet

Don't forget superconducting magnetic storage is also an option for storing renewable energy.

I have little idea as to how the cost compares, but I imagine progress like this is of help: https://en.wikipedia.org/wiki/Superconducting_magnetic_energ...

Is the energy stored in the current going around in a loop in the superconductor, or in the generated magnetic field lile an inductor?