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Energy Storage is becoming increasingly important with the advent of individual electronic devices and the rising need to accommodate a greater population which relies on these devices. A flywheel is simple form of mechanical (kinetic) energy storage. Energy is stored by causing a disk to spin on its axis. Flywheels are one of the most promising technologies for replacing conventional lead acid batteries as energy storage systems for a variety of applications including automobiles, economical rural electrification systems, and stand-alone, remote power units commonly used in the telecommunications industry.

Commercially available Flywheel Energy Storage (FES) Systems are used for small uninterpretable power systems. More recently, the flywheel has regained consideration as a viable means of supporting a critical load during mains power interruption, due to the lower capital expense and extended run time now available from many systems, as well as continued customer dissatisfaction with traditional electrochemical energy storage.