The first boat to be powered solely by renewable energies and hydrogen is preparing to make its a historic trip around the world. The water-borne answer to the Solar Impulse—the plane that completed its round-the-globe trip using only solar energy in July—will set sail in February. The journey is expected to take six years. The multi-hulled catamaran is in a shipyard at Saint Malo on France’s west coast, awaiting the installation of solar panels, wind turbines and electrolysis equipment, which breaks down water to produce its component elements, hydrogen and oxygen.