The thermal energy storage system aims to reduce the peak load by shifting the peak load to off-peak hours. The results will be a reduction in pollutants in the air, as less fuel would be burned, and a reduction in the need to build new power plants, meaning significant savings. In this report, progress in the design of a multi-stage thermal energy storage system is presented. A Currently, the system simulation for single and multi-stage systems has been carried out and the expected PH diagrams have been obtained. The simulation showed that the COP of the system would increase with increasing subcooling temperature and evaporator temperature. It was also noted that the COP of the system would decrease with increasing evaporator pressure, condenser temperature, and compression ratio. The COPs of the different arrangements were determined taking into account or not taking into account pressure losses, heat losses and isentropic efficiency. Additionally, the report shows the parts of the TES system and explains their functions and assembly. System testing was carried out and it was discovered that one of the condensers is malfunctioning and needs to be replaced. For this reason, no results have been obtained so far. Finally, the report describes the steps to be taken in the next stages of the project. Chapter 1: Introduction Background Thermal energy storage is a technology for storing thermal energy that can be used later. The reasons for using such a system are to balance energy production and energy demand [1]. Types of thermal storage systems for cooling applications are latent heat thermal storage and sensible heat thermal storage.[2].Advantages of TESThermal energy...... middle of paper. .....d the storage process in which the iced clathrate formed is stored for later use. After the storage process, the discharge process is carried out by running water through pipes through the direct evaporator, which will reduce the water temperature and can then be used for cooling. The project also aims to test multi-stage and single-stage refrigeration cycles. for the charging process to determine which one is considered optimal for a TES system. Furthermore, different types of refrigerants will be used to perform the charging process to determine the difference in operating parameter for each refrigerant and ultimately achieve the optimal refrigerant for such a system. In addition, additives such as alcohol and salt will be added to the clatherate to study the effect of additives on system performance and charging process. Work Cited Yudent