In order to deliver ferries with extremely low energy consumption, Havyard has developed digital ferry models and incorporated them into a ‘digital Sulafjord’ made with unique weather data from the area.

The Norwegian Public Roads Administration has invested over NOK 100 million in measurement masts and buoys in the Sulafjord. These provide data about wind, current, temperature, wave height and wave length that Norwegian researchers have not previously had, and that provide a unique insight into a fjord.

Havyard uses these data in its work on developing the new ferries that are set to cross the Sulafjord. R&D Manager Kristian Steinsvik explains that they have used the data on weather, wind, currents and waves to digitally recreate the conditions in the Sulafjord. In this virtual test tank of a fjord, a digital model of the ferry was tested, among other things to optimise the shape of the hull. The process also includes variables related to the ferry’s operation profile with many and frequent dockings.

‘In this way, we have managed to develop ferries with extremely low energy consumption using a battery system that is not only designed for fair weather, but that also enables fully-electric operation in rough weather.’ 

The planned battery-operation of the ferries on the Hareid–Sulesund route will reduce CO2 emissions by about 90 per cent when compared to them running on traditional fuel. This is a reduction of almost 8,000 tonnes of CO2 per year.

Cutting energy consumption
Havyard Group has had a long-term systematic focus on development work related to optimisation of hull lines and energy consumption. Using its own calculation cluster as its virtual test tank, it has over time delivered increasingly green vessels for offshore operations, support vessels for wind farms, a record number of ferries, and now also the design for the Kystruten coastal route. 

CEO of Havyard Group Geir Johan Bakke says that the calculation methods and virtual testing of models against weather, wind and wave data have gone a long way in optimising the vessels and cutting energy consumption.

‘Our goal has been to develop a realistic model that recreates what we see in real life, and we are constantly receiving confirmation that the modelling is in line with reality when the vessels are put into operation. This way of working is good news for both our customers and the environment.’ 

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Photo: 'Giskøy' on sea trial. Photo: Stig Breidvik

Green shift on the fjords – global benefits
The ferries that are set to run the Hareid–Sulesund route this winter are the first three in a long line of ferries where Havyard Group has delivered the design, propulsion, bridge solutions and ferry construction. The ferry deliveries make Havyard the biggest and leading player in the green shift on the Norwegian fjords and thereby in the world.

 In the marine equivalent to the Paris Agreement entered into last spring under the IMO (the International Maritime Organization), nations agreed to halve the total marine greenhouse gas emissions by 2050.  

‘This sets the guidelines for the authorities, our customers and ourselves, but these ferries and the work we have conducted and will conduct with Kystruten shows that we can meet the requirements by a good margin, as seen here with our ferries cutting emissions by 90 per cent.’ 

The ferries crossing the Sulafjord transport 120 cars with the same power drain consumption as eight or nine medium-sized electric cars.
‘As a bonus, on this route, all the cars on board could be called “electric” cars, since they are transported using electrical power and batteries.’ 

Front page photo: The third battery-run ferry for the Hareid–Sulesund route was delivered today. The planned battery-operation of the ferries will reduce CO2 emissions by around 90 per cent when compared to them running on traditional fuel. Photo: Stig Breidvik.