The purpose of this master thesis is to present the possibilities of using realistic measurements of the wind power plant, how useful these data are for forecasting wind energy and for selecting the wind power plant and its location. In this work we have examined various techniques for forecasting wind energy. The emphasis is placed mainly on forecasts of speed and power of the wind, which are the main parameters for predicting wind conditions. In addition to wind energy forecasts, we also present methods that are time-defined for different forecasting techniques. The methods are based on a variety of examples and are used for different forecasting purposes. For calculation of the conditions in the past and in the future, the Weibul's function is used, giving more or less precise results for different cases. Using the MATLAB software tool, we analyzed the data and presented them in graphic form by using measurements from a functioning wind power plant. Graphs representing weather conditions in the past are presented in different ways. These conditions are also presented with the forecasting method, with which we announced the production of electricity in the future. We repeated this for different time periods, among which we compared the forecast error. The results show that the accuracy of the forecast is very dependent on the time period for which the forecast is desired. The more measurements we have, the better the forecast will be. Some of the forecasts closely follow the actual situation, while some of them have greater deviations, that occur during the period when we have higher wind speeds. It is interesting to observe how, regardless of the large changes in wind conditions, months are repeated over the years and are keeping approximately the same values. The results are a very good factor for the insight of the future conditions and are useful for obtaining new investments and for the calculation of future costs and profit. An investment plan for a wind farm is presented on this subject, which gives us a financial basis for projects such as the construction of a wind power plant. The results obtained from the analysis of economic viability of wind farm investment show that at a certain subsidy the investment is profitable. However, if we need to rely on electricity prices on the market, we can not confirm the economic viability.
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