Electrical energy storage using flywheels

Flywheel energy storage systems, which are frequently known as mechanical batteries, play a unique role in storing kinetic energy that is store in a rotor. The energy storage ability of flywheels approaches 130 watt-hours per kilogram (Wh/kg), having power capabilities of nearly 500 watts per kilogram (W/kg). The flywheels are used with renewable power system, including wind power, for offering steady high-quality output, and with uninterruptible power supplies for improving the power quality. They are also replacing lead-acid batteries used for uninterrupted power supply system, including those that are utilized for telecommunications and information technology system. They are also used in other highly cyclic operations which involve dock crane use, where they have to compete with capacitors. Several advancements are also expected to come from engineering improvements as opposed to materials research developments, in the flywheel energy storage technology.