This paper supports decarbonisation in the marine industry by demostrating that a proper design methodology and state of the art technologies can significantly reduce greenhouse gas emissions. The paper demonstrates the possibility of reducing the environmental footprint of Marine High-Speed passenger transportation with innovative propulsion plant designs. The challenging solutions to designing a high-speed hybrid catamaran ferry, that satisfy design criteria and requirements, are presented and applied to a realistic case study. The design process investigated the potential electrification of the vessel to reduce its carbon footprint without compromising function and performance and a quantitative comparison to a conventional propulsion plant was carried out and presented.