The Wärtsilä 46TS-DF engine is the company's latest multi-fuel engine that can run on LNG, reducing air pollution, while also providing a viable basis for future decarbonization through biological or synthetic methane. According to the technology company, the engine was developed with a focus on economy, environmental performance and fuel flexibility, ushering in a new era of medium-speed marine engines. In April 2021, the Chantiers de l'Atlantique shipyard received the first order of this engine type from Royal Caribbean Cruises. The engines will be installed on the company's newest Oasis-class ship, Ocean Utopia. The vessel is currently under construction and will feature six Wärtsilä 46TS-DF engines with gas valve units and NOx reducers.