Power generation, effect superconductivity

Direct current (DC) can be stored in rechargeable electrochemical batteries (Pb acid, NiCd, Li ion cells). So far, alternating current (AC) cannot be stored practically, but must be generated and used as needed. Storing electrical currents in superconducting rings with zero power loss is possible, but not cost-effective (practical superconducting materials must be kept at... 

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