Wärtsilä Marine and Hycamite have collaborated to develop a cost-effective system for onboard hydrogen production from LNG on vessels in the shipping industry. This innovative solution aims to reduce greenhouse gas emissions, including CO2 and methane, with the potential for a negative carbon footprint when utilizing bioLNG. By utilizing the existing LNG infrastructure and in combination with Wärtsilä's LNGPac™ fuel gas handling system, the concept enables onboard hydrogen production. The system allows for a flexible approach by using a mixture of onboard hydrogen and LNG to power Wärtsilä's multifuel engines, effectively reducing the ship's CO2 and methane emissions. Additionally, the system produces solid carbon as a by-product, which is of high quality and suitable for industrial use, offering potential additional revenue streams. This solid carbon can be stored and retrieved on board, providing a more manageable solution compared to traditional CO2 capture and storage methods. The system is designed to be scalable and modular, fitting standard container dimensions, and is suitable for both new builds and retrofits into LNG-fueled vessels. The weight and space efficiency of storing solid carbon on board are highlighted, with solid carbon requiring significantly less space compared to gaseous CO2. The collaboration between Wärtsilä and Hycamite signifies an important step towards decarbonisation in the shipping industry, allowing companies to meet future regulations while offering enhanced fuel efficiency and reduced environmental impact.