An installation of an energy storage solution into such a vessel was a world-first and required a redefinition of applicable classification rules. Wärtsilä and NSS worked together in close collaboration with the DNV-GL classification society to solve the issue.
Vessels like the North Sea Giant operate with six diesel engines powering the electrical system on board. With this new retrofit installation, three energy storage units were added to serve as a backup system – the customer can still operate the vessel with all engines, but in addition there will be several megawatts in reserve available from the batteries.
For really efficient operations, they can run with only one engine connected to the grid, along with the battery units. In this way, the batteries will act as a power backup, kickin in to handle low peaks in the systems if additional power for certain operations is suddenly required.
They will also work together with the engines in such a way that allows the engine to be operated at its optimal load level, which of course improves fuel consumption and reduces operating costs and the exhaust emissions as well.