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This study focuses on the evaluation of biogas as main source of energy for a direct-biogas SOFC-MGT hybrid CHP system. A sensitivity analysis was conducted under various operating cenditions to investigate the infiuence of the key operating parameters of the hybrid CHP system with a consideration of the operational constraints,The key parameters in this study are SOFC reforming agents and SOFC fuel utilization factor (op. The study also presents guideHnes to achieve the optimum operating conditions ofthe hybrid CHP system, e.g, the overall system efficiency, SOFC eenciency, the thermal energy to electric power ratio (TER) and the electric power ratio ofMGT to SOFC (Puc T/PsoF･c), based en the desired heat and power outcomes.