The task of this thesis is to describe the technical and economical characteristics of the wind power plants.Cost-benefit analysis and selection of the wind power plant were conducted on the example of the wind power plant at location Vir with given wind speeds. Cost-benefit analysis was conducted using the known wind speed for that location. For wind power plant was calculated expected annual electricity production using the calculated probability of occurrence of certain wind speed in a particular location and the power curves of individual wind power plants. The obtained data shows that wind power plants with () can not work 5,366 hours during the observed year, that is 61.3% of the year. The remaining time of the year the wind power plant can operate but with a minimum power of 3.024MW only for 547 hours, that is 6.2% of the year, and a maximum output of 5.906MW only for 189 hours or 2.2% of the year. But even despite this data and the results we find justification for the construction of the wind power plants, which is increasingly being built around the world.