Japanese Firm Yanmar Gets Class Approval for Hydrogen-Powered Engineby Ship & Bunker News TeamYanmar is part of a consortium developing a hydrogen-compatible hybrid electric vessel combining a hydrogen engine generator with batteries. Image Credit: YanmarJapanese manufacturing firm Yanmar Power Technology has won type approval and Nox certification from Classification society ClassNK for its hydrogen-fuelled four-stroke engine. The engine is developed for power generation for domestic coastal vessels, Yanmar said in a statement on its website on Tuesday. Yanmar is also part of a consortium that is developing a hydrogen-compatible hybrid electric propulsion vessel that combines a hydrogen engine generator with batteries. Hydrogen is considered a possible long-term decarbonisation fuel for shipping, but the technology has yet to reach commercial maturity to power large ships.