The purpose of the work was to collect and compare the methods of estimating the cost of electromechanical equipment for small hydropower plants. To achieve the purpose of the work, the collected cost functions were transformed into a form that allows their comparison. Then, the theoretical cost of investment in electromechanical equipment for the six existing hydropower plants was calculated. The basic conclusion from the conducted research is that large differences in the results obtained using various methods do not allow their simple application in the case of planning a real investment in a small hydro power plant. Therefore, there is a need for extensive research based on national investments in small hydropower plants that would allow the development of models based on local data and the creation of a database on Polish case studies.

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