The current flowing through a magnet at 980 GeV is more than 4000 Amperes. For 980 GeV collider operation, the magnets are kept at 4.3 Kelvin. Cross section of a Tevatron magnet. Superconducting wire has absolutely no resistance. A magnet with superconducting coils dissipates no electrical power.
Power is needed to keep the magnets cold, at liquid helium temperature.
The magnets in CERN's LHC will run at 8.4 Tesla. The cryogenic cooling system is the largest cryogenic system in the world. Contact Ernie Malamud rev.