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• Alkali metal thermoelectric converter was combined with solar tower system. • For continuous power generation, thermal energy storage was utilized. • The impact of various solar tower parameters on the hybrid system was analyzed. • and the highest efficiency of 18% is obtained when the total heliostats area is 14,500 m 2. Solar tower plants (STPs) can foster reduce toxic emissions and a cleaner environment. Here, to step forward in this advance, this system is employed as a heat source for an alkali metal thermoelectric converter (AMTEC). Thermal energy storage (TES) is applied to stabilize the performance of the hybrid system along with solar irradiation fluctuations. The considered system is investigated on three different days for the humid subtropical climate of Bandar Abbas, Iran. This study's primary outcome and contribution is a novel simulation framework via TRNSYS to predict the performance of the system under fluctuations of solar irradiation at this site. Both TES and STP systems are defined in TRNSYS software as a new component type via utilizing the Fortran program. The effects of various parameters, including the total energy absorbed by the central receiver, the thermal capacity of TES, and the heliostats field area, are investigated on crucial output parameters of the AMTEC. The mass flow rate of the heat transfer fluid at several areas is then studied in different operating conditions. The optimum area for the heliostats (14,500 m 2), leading to the highest AMTEC efficiency (18%) is determined, which requests a TES tank volume of 28.13 m 3. This system is noticed to have its most remarkable performance in June and July. [ABSTRACT FROM AUTHOR]