Flywheel energy storage systems (FESS) are considered environmentally friendly short-term energy storage solutions due to their capacity for rapid and efficient energy storage and release, high power density, and long-term lifespan. . Flywheel energy storage (FES) works by spinning a rotor (flywheel) and maintaining the energy in the system as rotational energy. Pumped hydro has the largest deployment so far, but it is limited by geographical locations. Electrical energy is thus converted to kinetic energy for storage. This chapter mainly introduces the main structure of the flywheel energy storage. .
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Both liquid air and liquid nitrogen have been used experimentally to power cars. A liquid air powered car called was built between 1899 and 1902 but it couldn't at the time compete in terms of efficiency with other engines. More recently, a was built. Peter Dearman, a garage inventor in Hertfordshire, UK who had initially developed a liquid air powered car, then put the technology to use as
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