For the efficient use of available renewable energy in the form of solar,wind,geothermal, etc, reliable energy storage system is used so that variations in supply and demand can be smooth. The flywheel energy storage is a long lifetime uninterrupted power supply. Flywheel storage system is an alternative form of energy storage used in application like UPS ,etc. This requires high power to energy ratio. For long run storage it’s important that there is less amount of power loss or dissipation due to friction. In this way the flywheel storage system can store kinetic energy for very long time and durable.