This paper presents an Optimizat ion Sizing of a stand-alone PV/FC/Wind Hybrid System (PFWHS) to optimize the sizes of co mponents of PFWHS. Based on PSO algorith m, one optimal sizing method was developed to determine the optimal configuration of system that can achieve the load required power supply probability (Reliab ility) with a minimu m overall cost of energy (OCE).PFW HS costs involve investments, operation and maintenance as well as loss of load costs. The applied wind and radiat ion

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... tasets belong to northwest region (Jolfa, latitude: 38_56, longitude: 45_ 37, altitude: 710, m) of Iran. In this paper the impact of availability of PFWHS co mponents is investigated on optimal sizing. So, to investigating the impact of component availability rate on PFWHS costs and reliability due to failure and repair rate of PFW HS components and uncertainty in wind speed and solar irradiance, t wo scenarios are considered. In first scenario the availab ility of all co mponents is considered 1 and in second scenario isn't considered 1 because of failure and repair rate of co mponents and uncertainty in wind speed and solar irradiance. Obtained results prove that while the overall cost of energy is optimized, the reliability indices are within a satisfactory bound with regard to the reliab ility standards. Also the results indicate that considering co mplete availability of components causes more reliability rate, so to achieve the actual behavior of PFW HS, the rate of co mponents availability must be considered in suitable insight to designer for supply the load.