In this paper, for 24 SHPPs with significant installed capacity, between 676 and 6430 kW, totalizing almost 76 MW, with installed flows between 1.3 and 80 m3/s, the energy production is evaluated without and with an ecological flow representing 35 to 4.6 % from the mean flow in SHPP intake cross section. The energy loss is evaluated and there are presented some conclusions and assumptions regarding the way to impose an increased ecological flow without affecting too much the green energy produced in SHPPs.

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Among the multiple water uses, electricity generation is a factor strongly affected by alterations in the water cycle due to climate change. Long periods of drought followed by rainy periods lead to significant changes in the natural regimes of water flow in rivers. This paper aims to determine the long-term trends of seasonal inflows (spring, summer, autumn, winter) in Goleşti reservoir using daily data recorded over an 11-years period with the non-parametric Mann-Kendall test. The influence of tendency of increasing or decreasing was analyzed for the inflows in the Goleşti reservoir on the energy produced in associated hydropower plant.

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