Stena Line measures the carbon emissions footprint of transported goods onboard our ships in the unit of gram CO2/ton-km. This common unit for emissions related to transport work allows you as a customer to benchmark emissions levels with other transportation modes.
To calculate the CO2 emissions caused by your shipment is based on three factors:
- Tons of carried freight, including vehicle tare (metric tons)
- One-way distance of the route (km)
- Emission factor CO2 (kg) per transport work (ton-km)
The CO2 emission factor varies with different factors such as type of fuel, type of ship, weather, ship speed, allocation between freight and passengers onboard, and amount of freight relative to ship capacity. That is why there is a difference between the CO2 emissions on different routes, which also may vary over time throughout the year, due to changes in our network and operations.
Stena Line uses the MRV methodology for Ro-Ro and Ro-pax vessels in accordance with the MRV Directive by the European Union. CO2 emissions (incl. port stays) are allocated based on area occupied by freight on each ship, and these emissions are then divided by amount of freight transport work within that period of time. Emission data for each route is then obtained based on an average value among ships on that route, taking into account the number of departures per ship.
Updating frequency: starting 2022, the emission factor per route is updated quarterly after the end of each quarter (Q1-Q4), which represents the preceding 3-month period. This ensures you have access to the latest available estimates on CO2 emissions from our ships. Our emissions are still subject to annual verification by an external third party, in compliance with EU MRV and UK MRV disclosure requirements. For example, our Year 2022 emissions will be verified and disclosed in mid-2023 on EU MRV website (EMSA THETHIS-MRV).
Latest update: 30 March 2022.