Port of Gothenburg

Port of Gothenburg to save CO2 with hybrid service ship

During the second quarter of 2022, service ship Northern Skagerrak will be converted to a hybrid operation. It will collect oily engine room waste, known as sludge, from ships arriving at the Swedish Port of Gothenburg.

Northern Energy & Supply
Port of Gothenburg
Photo: Northern Energy & Supply

The 700 dwt ship will run mostly using electric power although there will also be an auxiliary engine that runs on the renewable fuel HVO.

The Gothenburg Port Authority procured the service from Northern Energy & Supply. The conversion is expected to save 680 tonnes of carbon dioxide.

“We are grateful once again to be entrusted with the task of working with the Port of Gothenburg on a project that will result in an improved environment in the Gothenburg area,” David Kristensson, Group CEO at Northern Energy & Supply, commented.

When the invitation to tender for sludge collection was issued, the Port of Gothenburg climate objectives were used as a starting point in the evaluation model. Carbon emission mitigation was one of the quality criteria applied when assessing potential service providers. Following collation and evaluation, the Northern Energy & Supply fossil-free solution proved to be the best option.

“Our aim at the Gothenburg Port Authority is to reduce carbon emissions at the port by 70% by 2030. Northern Skagerrak will serve around 6,000 incoming ships each year and the conversion to hybrid operation will be a significant step in the right direction,” Erik Waller, Deputy Harbour Master at the Gothenburg Port Authority, explained.

All ports in Sweden are obliged to receive sludge from ships arriving at the port. During operation, the vessels accumulate sludge, which is essentially wastewater containing a mixture of oil residue, cleaning agents, and solvents. The ships leave the wastewater to the port, then it is transported to a purification plant where oil and heavy-metal contaminants are separated from the water.