M/V Marne B repowered with Mitsubishi Tier 3 engines
A towboat operating on the inland waterways has been repowered with new main engines as part of an effort to extend its service life and maintain operational performance. The M/V Marne B,
Engines & Fuel
![Wärtsilä 25 ammonia engine. [Image: Wärtsilä]](https://www.marinelog.com/wp-content/uploads/2026/04/ammmoniawaer-300x225.jpg)
Wärtsilä 25 ammonia engine gets a power rating increase
Wärtsilä has increased the power rating of its four‑stroke Wärtsilä 25 ammonia engine. As part of the company’s ongoing development of ammonia‑fueled engine solutions, the upgrade to the Wärtsilä 25 ammonia engine
Diversified Marine completes M/V Larry Gravely towboat
A new towboat built by Diversified Marine in Houma, La., has been equipped with main engines supplied by Laborde Products. The M/V Larry Gravely is a twin-screw vessel designed for inland waterway
Op-Ed: Net zero by 2050? This decade’s fuel choices will decide
Green-hydrogen based synthetic fuels are stalled by a coordination problem across industries. Pooling demand and investment across sectors could unlock the production scale needed for shipping and other hard-to-abate industries, while strengthening
RINA and Hanwha cooperate to promote advanced battery-hybrid propulsion systems
With their eyes on the RO/RO ferry sector, Genoa-headquartered classifications RINA and Hanwha Group have signed a Memorandum of Understanding (MOU) aimed at promoting the adoption of advanced battery hybrid propulsion systems
Op-Ed: How cruise is setting the standard for low-methane slip on LNG
As the cruise industry embraces LNG, the conversation has shifted from feasibility to methane slip. Advances in engine technology, independent validation, and real-world operations show LNG becoming a credible, scalable fuel for
![Truck-to-ship methanol bunker fuel delivery in South Florida. [Photo: World Fuel]](https://www.marinelog.com/wp-content/uploads/2026/04/Methbunktop-300x225.jpg)
Two U.S. fuel suppliers team up to offer regulatory-compliant methanol bunkering
World Fuel Services and West Coast Clean Fuels say that they have now established a proven, regulatory-compliant, methanol bunkering capability that is available to vessel owners and operators across U.S. ports. The
![Hydrogen-fueled J-ENG 6UEC35LSGH will power a 17,500‑DWT multi-purpose vessel. [Image: J-ENG/MOL/Onomichi Dockyard]](https://www.marinelog.com/wp-content/uploads/2026/03/hyrdovessel-300x225.jpg)
J-ENG in hydrogen-fueled two stroke first
Japan Engine Corporation (J‑ENG) has successfully begun hydrogen co‑firing operation in all cylinders of a fully Japanese-made, large, low‑speed, two‑stroke hydrogen-fueled engine. According to J-ENG, the 6UEC35LSGH engine is the world’s first
Devall Diesel, FPT launch barge power pack
Devall Diesel Services, Sulphur, La., introduced a new addition to its product line, the Barge Power Pack, an engine system designed for hazardous-duty barge operations. The system is intended for use on
Op-Ed: Biofuels move from theory to practice at sea
By Siddhesh Prabhu, Surveyor, IRClass For many shipowners, the conversation around decarbonization is no longer about long-term ambition alone. It is increasingly about what can be done now, within existing operational and