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Poland has been long harnessing hydraulic energy despite the absence of supportive conditions for hydropower development. According to the Energy Regulatory Office, there were 721 hydropower plants in Poland in 2014. Electric power generation in small and medium-sized hydropower plants is characterized by minor fluctuations, in particular in comparison with other sources of renewable energy. In a given period, the observed changes in power output result mainly from variations in operating conditions. Hydropower re...