To mitigate the worst climate change effects, low-carbon technologies can play a vital role to decarbonize the energy system, as well as accelerate the energy transition. The integration of thermal energy storage systems with concentrated solar power systems increases clean energy utilization and offers more system flexibility and can assist in meeting the high energy demand during peak hours and nighttime. The objective of this research is to develop a physical model and perform techno-economic analysis of a direct sensible heat storage system integrated with a 100 MWe concentrated solar power plant. The thermal energy storage system employs molten salt as a heat transfer fluid composed of 60% NaNO₃ and 40% KNO₃. The storage system consists of a two-tank storage system with a storage capacity of 2,670 MWt/hr, which guarantees a 10-hour full load power back. The results show that the developed model produces a significant amount of clean energy: 607,199 MWh/year with the highest 69.3% of the capacity factor at the lowest levelized cost of energy of 8.9 c/kWh. The proposed system reduces 317.38 tons of CO₂ emissions during the first year of operation. Moreover, the economic analysis described the system's net present value, capital cost, IRR values, and lifetime of the developed system which is 25 years.