At present and in the nearest future in Latvia construction of small independent (privately owned) electrical power plants (hydro, wind and cogeneration) is taking place with intensive pace. Therefore, the influence of these power plants on the distribution networks is very significant. Unfortunately, in the power system there is neither applicable method nor the tool for analysing this influence. The article proposed by the Latvian Academy of Science, the Institute of Physical Energetics, and the Laboratory of Power System Mathematical Modelling is dealing with the created method for studying the influence of independent power plants on the configuration of electrical distribution networks. The method envisages the analysis of a situation and its optimisation. It is applicable for: 1) building of gradual load duration curves, distributed in scheduled modes, taking into consideration the generation curves of independent power plants; 2) Latvian dynamic model LDM-AVE'01 - 330/110/20 (10) kV for structural optimisation of networks and local electrical power plants. In the article, the results of experimental (pilot) calculations are reviewed. The experimental investigations indicate that the dependence of private electrical power plants on the situation is capable of facilitating or jeopardising the operation of distribution networks, and of decreasing or increasing costs in distribution networks. The method provides operation and comprehensive analysis of a situation and a system for each object individually with the least time consumable. The development of distribution networks and independent power plants is to be solved in complex applied the proposed method. Based specifically on the results of situation and system analysis, the decision could be taken on the connection of a particular power plant to the distribution network as well as on the elaboration of individual technical requirements. In parallel with practical application of the method, the statistical data acquisition and analysis are to be conducted to obtain experimental data. Investigations into the method applied and their improvements are envisaged to be continued.