Three Hurtigruten ships are to be converted into hybrid-powered expedition vessels.

The trio of ships will be re-named ahead of returning to service on year-round sailings along the Norwegian coast from 2021.

MS Trollfjord, MS Finnmarken and MS Midnatsol will become MS Maud, Otto Sverdup and MS Eirik Raude.

The ships will have battery packs installed to support upgraded engines in a bid to cut emissions together with other enhancements.

They will also be able to connect to power on share when they are docked.

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The transformation into premium expedition cruise ships, carrying a maximum of 530 passengers, will involve the three single largest upgrade projects in Hurtigruten’s 125 year-plus of history. No figure has been put on the cost.

The move follows the line introducing its first hybrid-powered cruise ship this year – MS Roald Amundsen.

The Norwegian company’s CEO Daniel Skjeldam said: “With these new expedition cruise vessels, you will be able to explore Norway like never before with all the comforts, facilities and expertise you need for creating a perfect adventure.

“Combined with ground-breaking green technology, these ships will truly stand out.”