The amount of the conventional energy sources is decreasing day by day. To avoid energy shortage, the use of renewable energy sources is highly required. A hybrid energy system usually consists of two or more renewable energy sources used together to provide increased system efficiency, but design of hybrid power involves uneconomic and excessive capacities results in excess electric generation. In this study optimization of wind-solar-diesel generator hybrid power system using HOMER Software is used to develop simulation model for BEC Campus. Hybrid Optimization Model for Electric Renewable (HOMER) software is used to carry out the optimization. The main objective is to optimize hybrid system component sizes, minimizing excess electricity generation, and unmet electric load and carry out cost analysis based on life cycle cost. Inputs used for simulation includes real solar radiation data and wind speed data (Averaged to monthly values), taken from weather station installed at Basaveshwar Engineering College and load data details taken for BEC Campus Energy Meter. Based on peak load, hybrid system component sizes considered and various simulation results are obtained.