Akademik Veri Yönetim Sistemi
International Conference on Energy Systems, İstanbul, Türkiye, 3 - 06 Mayıs 2026, ss.1-4, (Tam Metin Bildiri)
Hydrogen is increasingly considered a promising zero-carbon fuel option for maritime transport under emerging regulatory frameworks such as the International Maritime Organization lifecycle assessment guidelines and the EU FuelEU Maritime regulation. However, hydrogen production via electrolysis requires significant amounts of renewable electricity, raising questions about the optimal allocation of renewable energy across sectors. This study evaluates the system-level greenhouse gas abatement implications of allocating renewable electricity either to direct grid decarbonisation or to maritime hydrogen production. A threshold-based framework is developed to identify the grid carbon intensity conditions under which hydrogen production yields higher system-level emission reductions than direct renewable electricity integration into the grid. The analysis combines regulatory lifecycle emission factors for conventional marine fuels with electrolyzer efficiencies ranging from 60% to 85%. Results indicate that the hydrogen abatement threshold lies between 195 and 287 kgCO₂eq/MWh, depending on regulatory assumptions and marine fuel baselines. Comparison with electricity carbon intensities of selected hydrogen bunkering candidate countries suggests that most analysed regions currently remain above this threshold, while some lower-carbon electricity systems may benefit more from allocating renewable electricity to hydrogen production for maritime use. These findings highlight the importance of renewable electricity allocation efficiency when evaluating hydrogen-based maritime decarbonisation strategies.