Wärtsilä has increased the scope of its NextDF technology, now available for the Wärtsilä 25DF dual-fuel engine, marking a significant advancement in emission reduction for liquefied natural gas (LNG) fuel use.

This latest innovation minimises methane slip to less than two percent across all load points, with emissions as low as 1.1 percent within a broad operating range. In addition, NextDF technology achieves lower nitrogen oxide (NOx) emissions than the standard Wärtsilä 25DF engine, which already complies with IMO Tier III emission standards.

As LNG remains a key transition fuel within the maritime sector, Wärtsilä’s efforts aim to address a common issue: methane slip, or unburned methane escaping into the atmosphere during combustion. By targeting methane emissions directly, Wärtsilä’s NextDF feature strengthens LNG’s position as a lower-emission fuel, addressing global and regional regulatory frameworks.