The need to produce electrical power is increasing with the growth of industry and technology that is why the construction of the power plants is necessary. For the construction of a power plant, many factors that will contribute to economical justified building and to optimal operating of the plant itself should be considered. I focused on run off river power plant with pondage type which is typical for the chain of hydro power plants on the low current of the Sava. The goal of my research is to describe the main parts of the run of power plant with pondage, to study work of hydro aggregates at different values of water flow and, with the help of the computer programme, to define the most economic run of hydro aggregates at the given water flow. The descriptions of different places with main electro energetic and hydro mechanical components of the selected hydro power plant are presented in the first part. Descriptions are related to the hydro power plant Krško, where I was doing my practical education. A short description of the computer programme in Excel VBA, which used for all the calculations, is presented, as well. A demonstration of calculating the medial value of water flow on the Sava for the measuring spot called Čatež ob Savi, which is also a base to analyse the number and power of hydro aggregates, follows. Thirdly, the analysis about the number and the power of hydro aggregates depending on given water flow for the selected measuring spot is given. The calculations do not consider cleaning the front grids of turbines as the results of trash and economical aspect of buying and purchasing selected aggregate into the power plant. The results are shown for each combination of aggregates power and number. The results show, how the aggregates should operate in order to achieve the maximal power plant power.
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