At boot Düsseldorf 2025, Italian yacht builder Sanlorenzo unveiled a significant step toward greener propulsion with the introduction of a bi-fuel methanol/diesel engine developed in collaboration with MAN Engines. This new system will debut on the upcoming Sanlorenzo 50 X-Space and is expected to reduce emissions by up to 70%.
The initiative aligns with Sanlorenzo’s “Road to 2030” strategy, aiming for carbon neutrality in yachting. By leveraging partnerships with leading technology providers, the company seeks to stay ahead of both global and European environmental regulations while advancing sustainable boating solutions.
How the bi-fuel system works
The bi-fuel system, part of the European Union-backed LIFE MYSTIC project, integrates two high-speed, four-stroke MAN diesel engines and two four-stroke diesel generators from Nanni Industries. These engines are modified to run on a mix of green methanol and diesel, reducing reliance on fossil fuels and significantly cutting emissions. Expected benefits include:
- 150 tonnes per year reduction in CO2 emissions
- 700 MWh per year decrease in fossil fuel energy consumption
- 630 kg per year reduction in air pollutants
To accommodate the new fuel source, Sanlorenzo is redesigning the yacht’s fuel storage and distribution systems, ensuring seamless integration of methanol alongside conventional diesel.
Industry perspectives
Sanlorenzo’s Executive Chairman and CEO, Cav. Massimo Perotti, emphasised the importance of sustainability in modern yacht design:
“The future of yachting must be sustainable. Partnering with MAN to develop this bi-fuel system is a major step towards reducing our sector’s environmental footprint. The 50 X-Space will set a new standard in green propulsion.”
Mikael Lindner, Head of MAN Engines, highlighted the broader implications of the project:
“Our goal is to provide sustainable, alternative fuel solutions that make a real difference. This bi-fuel system is a significant contribution toward lowering CO2 emissions in yachting.”
A step towards carbon-neutral yachting
Sanlorenzo has already made notable advancements in sustainable technology. In 2024, the company launched the 50Steel, the first yacht equipped with a green methanol fuel cell system converting methanol into hydrogen to generate electricity with zero emissions. Additionally, the Bluegame BGH-HSV hydrogen-powered support vessel reached speeds of 50 knots with a range of 180 miles, setting a new benchmark for alternative propulsion in competitive sailing.
Despite recreational boating accounting for just 0.22% of global maritime emissions, Sanlorenzo is pushing the industry forward. With the launch of the 50 X-Space in 2027, achieving a 70% reduction in navigation emissions, the company is well ahead of the IMO’s 2040 emissions targets and the EU’s Fit for 55 agenda for 2030.
As alternative fuels gain traction, the bi-fuel engine could influence the broader marine industry, including superyachts and commercial vessels. This development underscores the growing role of sustainable innovation in luxury yacht design and beyond.
