New Directive of the European Parliament and of the Council on the pro­motion of the use of energy from renewable sources leads to rapid increase in the number of wind power plants and penetration of wind power into power systems. Highly variable and poorly predictable generation of wind power leads to serious concerns for power systems regarding control of their opera­tion regimes and power generation balancing. Solution to these and other issues requires knowledge of potential and likely deviations of pro­babilistic variations in wind power generation, interdependencies of wind power genera­tion variances between wind power parks and power system loads, parameters of wind speed and direction, etc. Successful integration of wind power plants into power systems demands appropriate assessment of all the types of required power generation reserves, research of wind power generation balanc­ing by distributed power plants, possibilities for energy accumulation and variable load. For the purpose of solving these tasks it is necessary to determine probability parameters and interdependencies characteristic of power plants utilizing renewable energy as precisely as possible.