The non-fossil fuel generator is a flywheel energy storage system (FESS), which has attracted new research attention recently in applications like power quality, regenerative braking, and uninterruptible power supply (UPS). As a sustainable energy storage method, flywheel energy storage has become a direct substitute for batteries in UPS and other electrical applications. This project work, however, presents an overview of the applications of FESS in power systems and micro grids (MG) and also analyzes the design parameters to improve the energy density of the fuel-less generator. The aim is to improve its value and enhance its applications in numerous fields, such as renewable power generation. At the end of the project work, it was observed that the speed of the flywheel and generator pulley has a linear relationship. Varying the size of either the motor wheel or the flywheel that is connected to the generator will affect the amount of voltage produced and also the amount of work done on the system. Thus, increasing either of them will increase the speed of the generator and, thus, increase the voltage produced. This shows that the higher the speed, the more the voltage supplied, and vice versa. On testing the generator, the output voltage generated was 101V at a speed of 234rpm on the flywheel.