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Growing population, increasing energy demand and environmental issues such as global warming and air pollution have prompted energy officials to shift toward renewable resources particularly wind and solar. In this study, the feasibility of a hybrid energy system for electrification of a residential building located in Kish Island, Iran is assessed. The building has 10 stories, a lobby and a parking garage. Initially, the building loads that include electrical, heating, cooling, and lighting are calculated by EnergyPlus software. Then, HOMER software is employed to optimize the system configuration. The average building load and the peak power are found to be 2.2 MWh/day and 206 kW, respectively. Three optimal systems that include wind-generator, PV-generator and PV-wind-generator were proposed. The wind-gas generator system was found to have the most economic configuration while the PV-wind-generator system has more reliable performance. While the wind-generator-battery system with NPC and COE of 2,967,316 $ and 0.187$/kWh is the most cost-efficient system, the PV-wind-generator-battery system that consists of a 200 kW PV array, three wind turbines, 86 batteries, a 150 kW gas generator, and a 90 kW converter can significantly reduce the pollutants.