Green Marine UK's Project Verdant has achieved an 'Approval in Principle' (AiP) from RINA for retrofitting Crew Transfer Vessels (CTVs) with hydrogen fuel cells and batteries. This milestone is a significant step towards reducing emissions while servicing offshore wind farms, with potential reductions of up to 30% in CO2 and 40% in NOx emissions. The project, supported by Innovate UK and in collaboration with Waves Group and EMEC, confirms the viability of using hydrogen as a marine fuel. The design integrates hydrogen fuel cells with electric motors to enable zero-emission operations at low speeds, addressing the industry's need for sustainable solutions. The project aims to gather insights from retrofitted vessels to expand the fleet with new Zero Emissions CTVs and Service Operation Vessels (SOVs). The involvement of Energys and Engineered Marine Systems (EMS) showcases the practical application of hybrid systems in reducing emissions during vessel operation. The AiP signifies a robust analysis and safety validation of innovative marine technologies, emphasizing the industry's commitment to decarbonization and aligning with international emission reduction targets. Project Verdant's recognition at the Scottish Renewables Green Energy Awards highlights its contribution to the offshore support sector's growth, with projections reaching £26 billion by 2050 and the need for sustainable vessels to support the UK's Net Zero transition.