In order to develop a sustainable and reliable hybrid energy generation system model in Southern Libya using concentrated solar power (CSP) with thermal energy storage (TES) to improve the overall efficiency, flexibility and sustainability of the energy generation facilities located in this area, this study has developed an energy generation system that integrates CSP using molten salts as TES with a gas turbine based on the equilibrium conditions defined by the use of sodium nitrate-potassium nitrate (NaNO3-KNO3); essentially, a two-tank molten salt system that can store heat at temperatures up to 565 degrees Celsius. The heat is then captured and produces electricity during non-solar times thereby allowing power generation to continue on demand and ensure continuity of electrical service. The researchers will utilize the System Advisor Model (SAM) to simulate performance of the solar field and the TES, while the Engineering Equation Solver (EES) will be used to conduct a thermal analysis of the thermodynamic processes associated with the Brayton gas turbine cycle. The researchers found that the addition of molten salt TES to a CSP energy system increased thermal efficiency by approximately 22 percent compared to a standard fossil fuel generation system, reduced fuel consumption by 26 percent and reduced carbon dioxide emissions by 18 percent versus a similar thermal generation system. Additionally, when the levelized cost of electricity (LCOE) from the integrated CSP, molten salt TES and gas turbine system was compared with that of traditional fossil fuel generation systems the total LCOE decreased from $0.22/kWh to $0.16/kWh indicating that this hybrid energy generation system provides an economically viable alternative for use in regions that are primarily arid and/or remote such as Ubari in Southern Libya, while addressing both fuel supply and grid stability challenges................ Keywords:........... CSP, TES, molten salt storage, Brayton cycle, hybrid energy system, LCOE, CO2, solar thermal.