The flywheel is modular and offers unparalleled configurability in terms of power to energy ratio, which makes it the first dynamic energy storage system whose discharge duration can be matched exactly to the customer's needs. Flywheel energy storage (FES) works by spinning a rotor (flywheel) and maintaining the energy in the system as rotational energy. It typically is used to stabilize to some degree power grids, to help them stay on the grid frequency, and to. ESSs store intermittent renewable energy to create reliable micro-grids that run continuously and efficiently distribute electricity by balancing the supply and the load. The ex-isting energy storage systems use various technologies, including hydro-electricity, batteries, supercapacitors. Flywheel Energy Storage Systems (FESS) rely on a mechanical working principle: An electric motor is used to spin a rotor of high inertia up to 20,000-50,000 rpm. Electrical energy is thus converted to kinetic energy for storage. They offer a rapid response, high efficiency, and long cycle life, making them ideal for balancing power grids, supporting renewable sources, and stabilizing energy loads.
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