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Faraday challenge
Battery technology structured electrode 
Thermal energy storage/ compressed air energy storage (60% eff?)
Flywheel 
  Solid monolithic
  Carbon fibre
  Laminated
  
  mechanical
  passive magnetic bearings
  active magnetic bearings
  
  PM
  Asynor
  Switch reluctance M/G
  
  rated power v.s. energy
  
  high number of dail cyclel
  fast reponse
  high cycle and calender