ClassNK has issued an Approval in Principle (AiP) for a maritime H₂ fuel cell system developed by YANMAR Power Technology (YANMAR PT). This is the first AiP certification for a maritime H₂ fuel cell system developed by a Japanese manufacturer.

H₂ fuel cells are gaining attention as a potential means to help reduce GHG emissions from shipping. Meanwhile, due to the unique characteristics of H₂, distinct from conventional gas fuels, safety discussions are actively underway at the IMO. Based on IMO's interim guidelines and relevant IEC standards, ClassNK has issued safety requirements for the design of ships using fuel cell power installations and the systems themselves to promote and expand the utilization of fuel cells in ships,

The maritime H₂ fuel cell system (300 kW) developed by YANMAR PT is designed with key auxiliary components such as gas valve units integrated within the system enclosure, aimed to facilitate easy installation on ships. On top of that, the system allows for parallel connection of multiple units and adjustments to the number of H₂ fuel cell modules, making it adaptable to various ship power output requirements.

ClassNK carried out a review of the system in line with its guidelines and examined the result of required tests and risk assessment. Upon confirming it complies with the prescribed requirements, ClassNK issued the AiP.