20.500.12556/DiRROS-22813 Sizing of a hydrogen system for green-hydrogen production by utilising surplus water accumulation in a hydropower plant The utilisation of surplus hydro energy can enhance the profitability of hydropower plant operation by cogeneration of green hydrogen along regular electricity production. Effective integration of the hydrogen system requires its appropriate sizing based on surplus hydro energy availability, its temporal dynamics, scheduled electricity generation, and expected hydrogen demand. The article introduces a decision-support tool designed for the optimal sizing of hydrogen systems in run-of-river hydropower plants with surplus hydropower. In contrast to conventional methods, the developed tool enables rapid configuration of key hydrogen-system components without relying on complex optimisation algorithms. Implemented in MATLAB App Designer, the tool provides a visual inspection of the entire search space, thus avoiding possible sub-optimal solutions. The tool has been tested on the case-study hydropower plant and it demonstrates the capabilities for proper sizing of a hydrogen system. The results show that the hydrogen system with 0.75-MW electrolyser and 20 m3 storage tank can generate up to 52,652 € in a rainy month and can produce up to 86 tonnes of hydrogen annually, achieving approximately 440,000 € of additional income. The tool can provide valuable insights into hydrogen system's installation profitability, to guide investment decisions in sustainable hydrogen infrastructure and can contribute to broader energy transition strategies. surplus hydro energy optimisation sizing green hydrogen presežek vodne energije optimizacija zeleni vodik true false true Elsevier Nizozemska Angleški jezik Slovenski jezik © 2025 The Authors. Neznano 2025-06-30 13:01:40 2025-06-30 13:01:40 2025-10-24 03:52:13 0000-00-00 00:00:00 2025 0 0 Nasl. z nasl. zaslona; Opis vira z dne 30. 6. 2025; Soavtorji: Boštjan Pregelj, Mihael Sekavčnik, Gregor Dolanc; str. 1-15 Vol. 255, [article no.] 123849 Dec. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2024-08-12 2025-06-21 2025-06-25 621.31 1879-0682 10.1016/j.renene.2025.123849 240808195 https://www.sciencedirect.com/science/article/pii/S0960148125015137 1 9ab1fa3a-55a1-11f0-8080-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=33153 RAZ_Jovan_David_Jure_2025.pdf RAZ_Jovan_David_Jure_2025.pdf 1 C8D6A826B15CB1D4BED2964D800DFE01 8d709ce2ce6516979537872e27d110c2bc0cb67cd8be9adb8fbea7cd5e225b95 20fbb815-55a2-11f0-8080-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=33154 Institut Jožef Stefan 0 0 0