The increasing consumption of electricity was the main reason for the increased use of wind energy, as a renewable energy source, bacause of its wide availability and development of technology use. As the lack of this energy source shall be taken variability of wind speed and stohastic nature, which is represented by a continuous probability distribution of the wind speed random variable. Wind speeds are described in Weibull distribution, which closely follows the actual distribution of the wind speed at the particular location. In this graduate thesis is performed the production system or wind farm adequacy or reliability assessment, using Monte Carlo simulation methods in simulation software. This can estimate and evaluate the production capacity needed to satisfy the demand of the total load in the system. There are also presented the reliability indicators demonstrated in this simulation method and analyze simulation results. In thesis there 77 is determined and availability of all components of the system based on the interruptions intensity and duration.