20.500.12556/RUL-169984 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 m$^3$ 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 hydrogen system hydropower plant presežek vodne energije optimizacija zeleni vodik vodna energija hidroelektrarne true false true Angleški jezik Slovenski jezik Članek v reviji 2025-06-30 12:41:53 2025-06-30 12:41:58 2026-06-13 04:29:36 0000-00-00 00:00:00 2025 0 0 15 str. Vol. 255, art. 123849 Dec. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.31 1879-0682 10.1016/j.renene.2025.123849 240808195 1-s2.0-S0960148125015137-main.pdf 1-s2.0-S0960148125015137-main.pdf 1 61FBA1D50706F0B89B397CFF82C9DF5F b487a2670040307f71428cf3e08675291a33189b146533206ecd4c8080a1a0a5 e7df5123-6636-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=235448 https://www.sciencedirect.com/science/article/pii/S0960148125015137 1 f5afe81f-559c-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=211874 Fakulteta za strojništvo 0 0 0