Abstract
Superconducting magnetic energy storage is an energy storage technique that relies on a particular property of some materials, superconductivity. A superconductor has zero electrical resistance and so when a current flows through it, there is no heat or energy loss. The best superconducting materials are metal alloys that must be cooled to very close to the absolute zero before they become superconducting. However once in that state, a superconducting coil can be charged with an electric current, which in turn generates a strong magnetic field in which energy is stored. This energy will remain, so long as the low temperature is maintained. Small superconducting energy storage rings have been used to provide grid support services because they are extremely fast acting. However larger storage facilities appear to be prohibitively expensive.
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