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Renewable energies are increasingly seen as the best solution to a growing   global population demanding affordable access to electricity while reducing   the need for fossil fuels. Country of Iran has vast untapped solar, wind,   geothermal and hydroelectric sources that hold the potential to meet domestic   needs. Renewable energy is also essential to Iran as it will curb massive air   pollution. In this paper economical and feasibility study of various hybrid   systems are performed by using HOMER software model for supplying electricity   to the Engineering Department of Islamic Azad University. For this study,   annual electricity demand of the university is 1,174,935 kWh with a peak   demand of about 331 kW, average wind speeds, based on hourly data during the   period of eleven years (2000-2010), are between 3 to 5 m/s in all months of   the year. For solar radiation, six models are evaluated to select the best   model for estimation of the daily global solar radiation (GSR) on a   horizontal surface in the study location. Among these six models, H/HO=a+b   (S/S0)+ c(S/S0)2 is chosen as the most optimum model for estimating solar   irradiation. The results indicate that among the three hybrid systems for   fulfilling electrical energy needs, the Wind/Diesel/Battery hybrid system   with 9 wind turbines (20 kW), one diesel generator (300 kW), 50 batteries,   and 50 kW power converters with net present cost of $4,281,800 and cost of   energy of 0.285 $/kWh is the most economically efficient hybrid system.   (based on 2015 US dollar)

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Feasibility study of renewable energy resources and optimization of electrical hybrid energy systems: Case study for Islamic Azad University, South Tehran Branch, Iran