On April 12, the Viking Grace ferry, owned by the Viking Line ferry company, began operating between the Finnish Turku and Stockholm. It is equipped with a propulsion system powered by liquefied natural gas and the so-called rotary sail, which allows the vessel to save fuel, reduce harmful emissions, noise level to a minimum and significantly improve the environmental performance of the route.
Rotary sail - development of the Finnish engineering company Norsepower Oy Ltd. It is powered by wind energy. The height of the cylindrical rotor is 24 meters with a diameter of 4 meters. The force acting on the rotor is perpendicular to the direction of the wind. Special sensors automatically determine the strength of the wind, after which at a certain moment they turn off the gas turbine and start the rotary sail.
Viking Grace has 880 cabins, can carry 2, 800 passengers and about 500 vehicles.