**3. Working of Electrical Energy Storage System (EES)**

## *3.1. Mechanical Storage Systems*

Mechanical energy storage devices store received energy by utilizing kinetic or gravitational forces. These systems are useful in real-world applications due to quality materials, advanced computer control systems, and imaginative design [17]. Mechanical energy storage operates in complicated systems that employ heat, water, or air in conjunction with compressors, turbines, and other machinery.
