This study presents an exergy analysis of combined heat and power production via gasification of various Mediterranean agro-food processing biomass fuels, including olive kernel, fruit kernel and waste biomass from wine production process. The bioenergy system (the SMARt-CHP) is sized for a maximum thermal output of 12 kW in addition to approximately 5 kW electrical output and involves: a fluidized bed gasifier, a producer gas cooling/cleaning system and an internal combustion engine for combined heat and power production. The gasification was conducted at temperature range of 750 degrees C-850 degrees C under atmospheric pressure, with a constant equivalence ratio of 0.3 kg-air/kg-biomass. Based on data obtained for the gasification at 750 degrees C (optimal condition for producer gas energy content), exergy analysis was performed for the system and each of its components; exergy of producer gas, tar and ash were calculated. The exergy losses were found to be higher in the internal combustion engine, followed by those in gasifier and producer gas conditioning. The results revealed the implication of biomass fuels' oxygen and moisture contents in the exergy efficiency of the individual parts and also tar contained in the producer gas implication in the system's performance. (c) 2015 Elsevier Ltd. All rights reserved.