Green-powered boat prepares for round-the-world voyage

Vessel aiming to be the 'Solar Impulse of the seas' will be powered solely by renewable energies and hydrogen during its six-year voyage

Dubbed the "Solar Impulse of the seas", the first boat to be powered solely by renewable energies and hydrogen hopes to make its own historic trip around the world.

A water-borne answer to the Solar Impulse - the plane that completed its round-the-globe trip using only solar energy in July - the Energy Observer will be powered by the sun, the wind and self-generated hydrogen when it sets sail in February as scheduled.