Everllence announced that its 21/31 dual-fuel four-stroke engine has successfully run on ethanol at its test facility in Frederikshavn, Denmark. The engine performed across all load points, showing that the platform can operate on ethanol without compromising stability or efficiency.
A Decade of Platform Evolution
The 21/31 engine platform has expanded steadily over the past decade. First, the company introduced methanol-burning two-stroke engines, which later moved into commercial service in 2016. Then, in 2024, Everllence launched the 21/31DF-M GenSet, a methanol-capable version already operating on multiple vessels.
With this latest test, the platform now supports ethanol as an additional low-carbon fuel pathway. The trial confirms that the engine can burn ethanol reliably, offering shipowners a broader set of options.
Technical Progress Demonstrated in Testing
According to Rasmus Frimann Nielsen, Senior Manager and Head of Four-Stroke Small-Bore Engineering, the engine delivered a strong performance throughout the trial. He noted that the system achieved a higher ethanol share than methanol during testing. This behaviour aligns with the design updates the engineering team prepared in advance.
Because the test validated these upgrades, the team now has firmer data to support further development of the platform. It also provides operational proof that ethanol can be integrated into the company’s next phase of work.
Rising Interest in Ethanol Across the Maritime Sector
Interest in ethanol is growing as owners explore more fuel options for decarbonisation. Lars Zimmermann, Director of Sales & Promotion for Marine GenSets, stated that the new capability strengthens the company’s fuel-flexible strategy. He added that ethanol gives operators another route to meet tightening regulatory demands, while maintaining practical fleet operations.
Moreover, ethanol is drawing attention because it can fit into existing logistics chains more easily than some other low-carbon fuels. As a result, the engine’s compatibility may encourage broader industry engagement.
Supporting Future Marine Operations
By unlocking ethanol capability for the 21/31 engine, Everllence offers the market another viable step in the shift toward cleaner propulsion. The new configuration allows owners to test alternative fuels without waiting for large-scale infrastructure changes.
In addition, the platform’s flexibility creates room for future upgrades as more alternative fuels reach commercial maturity. Because of this adaptability, shipowners may find it easier to adjust their fleets as regulations evolve and new technologies emerge.
Did you subscribe to our daily Newsletter?
It’s Free — Click here to Subscribe!
Source: Everllence
