From a Curbed.com online article:

The domed capsule is the brainchild of naval architect Jean-Michel Ducancelle, who was inspired by the floating saucer in the 1977 Bond film The Spy Who Loved Me. Under development for the last 15 years, this 21st-century version is outfitted with five south-facing solar panels that soak up the sun and power the electric motors and mechanical systems.

Half-boat, half-futuristic pod, the Anthenea is a bold take on sea-bound tourism. While we’ve already seen everything from an underwater Maldives hotel to an elevating floating home, the 538-square-foot Anthenea is being billed as “the world’s first eco-luxe floating hotel suite” (that can also be used as a spa, restaurant, night club, or really whatever the buyer can dream of).

http://www.anthenea.fr/en/homepage/

To read more: https://www.curbed.com/2019/9/5/20850121/solar-powered-floating-hotel-suite-anthenea