In this study, modeling and computer simulations were made by using grid, wind (WT), solar (PV) and generator energy systems in order to meet the electricity needs of a greenhouse company. In the computer simulation, the electrical load of the company was found as 369.52 kWh per day and optimization and sensitivity analyzes were performed for the most suitable system to meet this electric load. The results were evaluated according to the cost of energy (COE). According to the simulation results, the energy cost of photovoltaic and wind energy systems is 0.084 and 0.059 $ kW-1, respectively. COE results show that the photovoltaic system is more expensive than the wind energy system. When the annual energy production amounts are examined, the wind energy system can produce 3.1 times more energy than the photovoltaic system. On the other hand, the energy cost of the diesel generator (0.554 $ kWh-1) is the most expensive energy source for this operation with the photovoltaic system. In the study, harmful gas emission values were also investigated. If a wind energy system is installed, 34742 kg CO2, 151 kg SO2 and 73.7 kg NOx emissions can be prevented annually. According to the results, it was found that the most suitable system for greenhouse operation was wind energy.