“…This document aims to review the state-of-the-art development of EES technologies including PHS [18,21], Compressed Air Energy Storage system (CAES) [22][23][24][25][26], Battery [27][28][29][30][31], Flow Battery [14][15]20,32], Fuel Cell [33][34], Solar Fuel [15,35], Superconducting Magnetic Energy Storage system (SMES) [36][37][38], Flywheel [32,[39][40][41], Capacitor and Supercapacitor [15,39], and Thermal Energy Storage system (TES) [42][43][44][45][46][47][48][49][50]. Some of them are currently available and some are still under development.…”