I am on a Cruise Ship celebrating some family holidays. This cruise was selected as it is completely fueled by sustainable energy. The most exciting part is the Kite, which is then developed to a high standard.
With all that wind energy available on the open see it's just that one big kite at the end of the ship flying at moderate altitude, however generating enough power to supply that wh*** ship.
Of course, if there's no wind, there are solar panels. And a big battery.
The Kite is much more elegant and effective for a ship than a regular windmill power plant. For a windmill you carefully have to watch the static of the ship, and that wh*** construction is quite heavy.