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Monday, December 14, 2020 

A Wärtsilä Hybrid Upgrade solution has been selected for retrofitting two offshore construction vessels owned by Norwegian operator Østensjø Rederi, to allow less use of the ships’ engines with correspondingly lower levels of exhaust emissions, particularly when while operating in DP mode.

The two ships, the Edda Fauna and Edda Flora, were built in 2008. The customer opted for the Wärtsilä Hybrid Upgrade solution in order to give the ships a more attractive environmental profile for potential charterers. The upgrade will include the company’s new electronic DC bus-link, which allows a vessel to operate in DP 2 and 3 modes with a closed DC bus in hybrid, and an open bus on the AC system. The reduced running of the engines saves fuel and lessens the carbon footprint, while engine maintenance requirements are also alleviated.

Egil Arne Skare, Chief Project Officer, Østensjø Rederi, said: “We intend to be a shipping company that leads in sustainable operations. Today’s carbon footprint is to be reduced through systematic efforts and continued technical development at all levels. This is why we have chosen to upgrade these vessels to hybrid propulsion, which is an area of technology where Wärtsilä excels.”

“The Wärtsilä Hybrid Upgrade solution aligns with our five strategic themes; Towards Zero Emissions, Efficiency, Safety, Reliability, and Fuel Flexibility. There is a growing trend in the marine sector towards hybrid propulsion, with more and more companies taking advantage of the benefits it offers,” said Helge Solberg, Senior Proposal Engineer, Wärtsilä Marine Power.

Delivery of the Wärtsilä equipment to both vessels is planned for January 2021. Funding from Enova, the Norwegian government enterprise that promotes environmentally friendly production and consumption of energy, has been an important contribution to this project.

By combining experience in marine electrical, automation and engine technology, Wärtsilä has brought together functions and systems to deliver a single integrated hybrid power module that combines engines, an energy storage system, and power electronics optimised by a sophisticated, energy management system (EMS). The EMS functions as the ‘brain’ in the system, optimising the energy flows between the different power sources, storage and consumers to achieve optimal efficiency.

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