Viking Line first on the Baltic Sea again: Passengers can reduce their emissions from travel by up to 90 per cent

21. June 2023

Viking Line’s focused environmental work, which began in the 1980s, once again shows the way for the entire maritime shipping industry. The company has started to offer passengers on its Turku-Åland-Stockholm route the option of purchasing renewable biofuel in proportion to the amount of fuel used for their journey and thus reduce the emissions from their travel by up to 90 per cent. European biogas, produced from waste materials, is being delivered by the Nordic energy company Gasum to the climate-smart vessels Viking Glory and Viking Grace.

Starting June 21, Viking Line’s passengers on the Turku-Åland-Stockholm route can purchase biogas in proportion to the amount of fuel used for their journey. On a cruise between Turku and Stockholm, the additional price is less than 5 euros. At that price, passengers reduce their carbon footprint by up to 90 per cent compared to a trip where liquefied natural gas (LNG) is used. The amount of liquefied biogas (LBG) purchased is based on average fuel use per passenger.

“This really is an important milestone in our more than 40-year journey towards sustainability. We are the first shipping company on the Baltic Sea to offer passengers the option of reducing their carbon footprint by replacing LNG with renewable biofuel. Many of our passengers have asked for such an option, and we are really pleased that we can now engage them even more in our work for the environment and the Baltic Sea,” says Dani Lindberg, Sustainability Manager at Viking Line.

Viking Glory and Viking Grace are climate-smart vessels that even in the planning phase were prepared to run on biogas and synthetic fuels produced from renewable energy. Viking Glory was launched in service in 2022 and Viking Grace in 2013. Normally, the vessels run on liquefied natural gas, which is also a low-emission energy source compared to oil-based fuels. Nitrogen oxide emissions from LNG are 85 per cent lower than when using oil-based fuels, which helps counter eutrophication (nutrient enrichment) and acidification of the Baltic Sea. For humans, practically no sulphur emissions or particulate matter is generated using the fuel. The switch to biofuel in turn will especially reduce greenhouse gas emissions.

“Our investments totalling 450 million euros in the climate-smart Viking Glory and Viking Grace have enabled the use of liquefied natural gas, and now biogas is being introduced. Working for the environment requires vision, engagement and significant investments in new technology,” notes Dani Lindberg.

In biogas production, waste streams in society – such as food and agricultural waste – are used as raw materials, which promotes a circular economy. Viking Line is issued a sustainability certificate for every biogas delivery, which specifies where and how the gas was produced. The method used to produce the gas affects the ultimate amount of emissions. In practical terms, Viking Line purchases biogas with the additional funds paid by passengers. The biogas used for fuel on board is mixed with LNG.

“The supply of biogas is still limited compared to demand. For example, all biogas produced in Finland is currently used in manufacturing. We will now work in partnership with Gasum and our environmentally-aware customers to increase the use of biogas,” says Dani Lindberg.

Viking Line is currently taking part in projects that explore the possibilities of creating a carbon-neutral green corridor for the Baltic Sea. Biogas has already been tested as a fuel on Viking Grace.

“Through our project work and partnership for the sustainable maritime transport of the future, we have gained a great deal of knowledge and information to support our own sustainability work. Carbon-neutral maritime transport still lies in the future, but it is no longer a utopian dream. Our goal at Viking Line is to be among the first when the time comes,” says Jan Hanses, President and CEO of Viking Line.

For further information:

Dani Lindberg, Sustainability Manager, tel. +358 18 27 000

Johanna Boijer-Svahnström, Senior Vice President, Corporate Communications, tel. +358 18 270 00

Christa Grönlund, Communications Manager, tel. +358 9 123 51

Viking Line’s environmental journey:


• Viking Line stops using toxic paint for the bottoms of its vessels, and divers start using brushes to clean the vessel bottoms.

• Recycling waste on board the vessels starts.

• First land-based power supply is placed in service in Stockholm. A land-based power supply is now also used in Helsinki, Mariehamn and Tallinn.


• The switch to fuel with low sulphur content reduces sulphur dioxide emissions.

• The wastewater on vessels starts being pumped ashore for treatment.

• Cold seawater starts to be used to cool the air on board the vessels, while the air on board is heated using energy recovered from flue gases.


• Viking Line is the first shipping company in the world to use Humid Air Motor technology to reduce nitrogen oxide emissions. By using seawater for cooling, the combustion temperature of the vessel’s engines is lowered.

• Nitrogen oxide emissions are reduced on Viking Cinderella when catalytic converters are installed on the vessel.

• Recycling of organic waste starts on board Viking XPRS.


• The new vessel Viking Grace uses 100% sulphur-free liquefied natural gas (LNG) as fuel. The climate-smart vessel reduces nitrogen emissions by 85% and greenhouse gas emissions by 15% compared to a vessel that runs on oil. Particulate matter emissions are cut to practically zero.

• Viking Grace tests a rotor sail and thus becomes the world’s first hybrid vessel to use both LNG and wind power. The vessel is equipped with an energy recovery system that converts surplus heat into electricity.


• Current stabilizers are installed on Viking Gabriella and Viking XPRS, which reduces fuel consumption and carbon dioxide emissions.

• The new vessel Viking Glory is placed in service in March 2022. The vessel’s engines enable optimal fuel utilization and produce no sulphur emissions.

• Thanks to Viking Glory’s Azipod rudder propeller system, the vessel can be smoothly manoeuvred in port, which saves time and fuel. The shape of the vessel’s hull reduces the formation of waves as well as fuel consumption.

• Viking Glory is also a pioneer in utilizing waste cooling from LNG. The energy recovery system generates up to 40% of the electricity the vessel needs for passenger functions.

• On board Viking Glory, the lights are automatically turned off in empty cabins and the ventilation and heating are automatically lowered.

• Viking Line starts offering passengers on Viking Glory and Viking Grace the option of purchasing biogas to carbon-offset their travel and thus reduce their own emissions by up to 90%.