Battery retrofit for subsea construction vessel

The retrofit energy storage system will improve the operational efficiency and environmental footprint of the North Sea Giant The retrofit energy storage system will improve the operational efficiency and environmental footprint of the North Sea Giant
Industry Database

Wärtsilä is to retrofit what it says is the world’s first energy storage solution on board a large DP3 offshore supply vessel.

The North Sea Giant owned by Norwegian North Sea Shipping AS will be fitted with a battery that reduces the vessel’s energy consumption, operating costs and exhaust emissions.

“For us is it important to reduce environmental emissions and modernise the vessel to make it more competitive. In addition, with a more efficient vessel, we will save fuel expenses,” said CEO Hallvard Klepsvik, North Sea Shipping AS.

“After Wärtsilä had retrofitted our ship Atlantic Guardian in 2014, we really understood how much fuel can be saved by improving the vessel’s efficiency. Efficiency also saves time, because you only need to refuel every second or third port visit.”

Emissions reduction

The estimated reduction in emissions after the retrofit is 5.5 million kg CO2, 30 tonnes of NOx and 1,200 kg SOx per year.

For the operator, the solution will also provide power redundancy and increases responsiveness of vessel operations.

Typically, a vessel with dynamic positioning uses two or more engines simultaneously to secure back-up power. This means that the engines’ load run low. By using a hybrid/battery system to provide the needed back-up power, the operational engine can be used closer to its optimal load.

In addition to the hybrid/battery solution, the agreement signed in August 2017 includes transformers, filters, switchboard, shore connection equipment, upgrades of existing components and commissioning.

Close cooperation

Installation of an energy storage solution into a class DP3 vessel has never been carried out before and requires a redefinition of applicable classification rules. Therefore, Wärtsilä and North Sea Shipping AS are working in close collaboration with DNV-GL.

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