Abstract - This study gives a critical review of flywheel energy storage systems and their feasibility in various applications. ESSs store intermittent renewable energy to create reliable micro-grids that run continuously and efficiently distribute electricity by balancing the supply and the load [1]. What is a flywheel/kinetic energy storage system. . With the rise of new energy power generation, various energy storage methods have emerged, such as lithium battery energy storage, flywheel energy storage (FESS), supercapacitor, superconducting magne Flywheel Energy Storage Market Statistics, The flywheel energy storage market size crossed USD 1. 3. . What is a flywheel/kinetic energy storage system (fess)? Thanks to the unique advantages such as long life cycles, high power density, minimal environmental impact, and high power quality such as fast response and voltage stability, the flywheel/kinetic energy storage system (FESS) is gaining. . Thanks to the unique advantages such as long life cycles, high power density, minimal environmental impact, and high power quality such as fast response and voltage stability, the flywheel/kinetic energy stora.