Finnlines chief executive Emanuele Grimaldi has outlined steps the company will take "to reach the ambitious goal of becoming carbon neutral".
The Helsinki-based ro-ro and ro-pax operator is prepared to modify existing ships with new tanks and engines to run on new types of fuel, he said.
But the focus will remain on existing technology until zero-carbon fuels are commercially available at scale.
These include new battery technology, hydrodynamic design in vessels, air lubrication systems and solar panels on its newbuildings.
