Due to the highly interdisciplinary nature of FESSs, we survey different design approaches, choices of subsystems, and the effects on performance, cost, and applications.
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Summary: Flywheels are mechanical batteries that store kinetic energy through rotation. Their energy storage capacity depends on factors like material strength, rotational speed, and design efficiency.
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The flywheel energy storage system is useful in converting mechanical energy to electric energy and back again with the help of fast-spinning flywheels. This system is composed of four key parts: a solid cylinder, bearings, a motor/generator and a vacuum sealed casing.
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By Type: Lithium-ion battery dominates the market with a share of 69. 8% in 2025, owing to its superior energy density, declining production costs, and mature global supply chain.
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