Abstract Ammonia (NH3) has attracted much attention as both a fuel and an energy carrier due to its flexibility and overall cleanliness. As hydrogen storage, it can be used for short to long terms and has lower environmental impacts at the point of use·NH3 synthesis is commonly performed by reacting hydrogen and nitrogen via the Haber-Bosch process. Due to its energy-intensive processes for hydrogen production, as well as high pressure required for NH3 synthesis, an alternative highly efficient system is needed. An integrated system that combines biomass pre-treatment (evaporation and carbonization), combustion, thermochemical cycle for NH3 synthesis, and power generation is proposed in this work. By performing NH3 synthesis via the thermochemical cycle consisting of reduction and oxidation, the process can bypass the steam reforming process of hydrogen production. Additionally, the thermochemical cycle can be performed under an atmospheric condition in the absence of a catalyst. The integrated system is proposed based on enhanced process integration involving exergy elevation and exergy recovery. Furthermore, the effect of thermochemical cycle conditions on the NH3 production efficiency and performance of power generation at different parameters are evaluated. As a result, utilization of 100 t h−1 of empty fruit bunch can coproduce NH3 and power of 8.95 t h−1 and 46.35 MW, respectively. Besides, the developed system can achieve a total net efficiency of about 48%.