Flywheel Energy Storage is a technology that stores energy in a rotating mass, or flywheel. When energy is added, the flywheel spins faster, storing kinetic energy. When energy is needed, the flywheel slows down, releasing the stored energy back into the system. This process is efficient and can respond quickly to changes in energy demand. One of the main advantages of flywheel systems is their durability and low maintenance. They can last for many years without significant wear and tear. Additionally, they are environmentally friendly, as they do not rely on harmful chemicals or materials, making them a sustainable option for energy storage.