Molinski, MattisMattisMolinskiIhrens, JanaJanaIhrensKern, Thorsten AlexanderThorsten AlexanderKern2026-08-112026-08-112026-06-30Ship Technology Research 73 (2): 161–172 (2026)https://hdl.handle.net/11420/64276Shipping is highly efficient yet a significant greenhouse gas emitter. Achieving the IMO's 2050 carbon-neutrality target demands exceptionally efficient new vessel designs. However, ship design is complex due to the vast number of interacting options–e.g. hybrid electric architectures, renewable integration, sector coupling, and energy storage. Energy system design remains a largely manual, iterative process based on prior experience, often overlooking unconventional concepts. The Maritime Energy System Optimizer (MESO) addresses this gap. MESO is a modular Python platform optimizing the architecture, dimensioning, and operation of sector-coupled ship energy systems via a genetic algorithm. Fitness is evaluated through operational, component, and volume costs, with operation optimization using the open energy modeling framework. Its novelty lies in unbiased architecture optimization over dynamic load profiles, reducing design iterations. MESO is demonstrated in two case studies–a cruise ship's multi-energy system and a container ship's auxiliary electrical system–identifying efficient, unconventional configurations.en2056-711120262161172Taylor & Francishttps://creativecommons.org/licenses/by/4.0/architecture optimizationcoupled energy systemsEnergy system optimizationgenetic algorithmgreen ship designmixed-integer linear programmingpartial-load operation optimizationTechnology::623: Military Engineering and Marine Engineering::623.8: Naval Architecture; ShipbuildingJournal Article10.1080/09377255.2026.269079810.15480/882.17843