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¹ University of Belgrade, Faculty of Biology, Department of Algology and Mycology, Institute of Botany and Botanical Garden “Jevremovac”, Takovska 43, 11000 Belgrade, Serbia DOI : 10.4194/TRJFAS25621 Viewed : 195 - Downloaded : 168 Energy of running water accounts for almost 3/4 of the global supply of renewable energy sources and almost 1/5 of total electricity generation. Large and small hydropower plants are associated with a number of environmental problems. The main aim of this study is to investigate the impact of SHP on the diatom community. A total of 149 diatom taxa classified in 47 genera were identified, some of which are considered invasive (Achnanthidium druartii), rare (Gomphonema zellense, Frustulia amphipleuroides) and Navicula radiosafallax is first finding for Serbia. The impact of SHP is evident considering diatoms diversity and relative abundance of dominant species in three seasons (summer, autumn and winter). Values of most measured physico-chemical parameters changed immediately downstream of the SHP. Based on most diatom indices, the water of the Ljuboviđa River had a good ecological status. TID and TDI indicated a predominantly moderate water quality of the Ljuboviđa River. According to Serbian regulations, the Ljuboviđa River had a high ecological status. Keywords : Renewable energy Running water Diatom community Ljubovida River