MS Roald Amundsen & MS Fridtjof Nansen

(10:17 a.m. EDT) -- Hurtigruten has activated its option for a third hybrid-powered expedition cruise ship to be delivered in the second quarter of 2021. The cruise line already has two hybrid ships under construction at Norway's Kleven Verft AS shipyard.

"We are thrilled to introduce yet another revolutionary hybrid powered expedition ship," said Hurtigruten CEO Daniel Skjeldam. "This groundbreaking vessel will take our guests to some of the most spectacular areas of our planet, in a more sustainable and environmentally-friendly way than ever seen before."

Hurtigruten's hybrid cruise ships reduce fuel consumption by approximately 20 percent and can sail with just electric propulsion for up to 30 minutes at a time. Onboard features include large observation platforms, three restaurants and a pool deck with infinity pool, whirlpools and a bar. The majority of cabins on the ship will have balconies.

Roald Amundsen, the first of Hurtigruten's 530-passenger hybrid-power ships is scheduled for delivery in May 2019, after being delayed nearly a year. Its second ship, Fridtjof Nansen, will debut in 2020, after also being delayed.

--by Dori Saltzman, Senior Editor