This second expression forms the basis for superconducting magnetic energy storage.

There are several reasons for using superconducting magnetic energy storage instead of other energy storage methods.

Discusses superconducting magnetic energy storage.

It is referenced that pulsars themselves are embryonic galaxies and that they are a type of superconducting magnetic energy storage mechanism.

Superconducting magnetic energy storage (SMES)

Because a superconducting inductor is virtually lossless, it can store a large amount of electrical energy within the surrounding magnetic field (see superconducting magnetic energy storage).

To ameliorate this systemic defect, superconducting magnetic energy storage units at critical junctions can store or release power for a few seconds to allow control systems to catch up and actuate isolating procedures.

Superconducting magnetic energy storage (SMES) systems store energy in the magnetic field created by the flow of direct current in a superconducting coil which has been cryogenically cooled to a temperature below its superconducting critical temperature.