According to this article this is the world’s largest solar powered yacht. Called the Tûranor PlanetSolar it is currently on a round the world voyage and hopes to be the first solar powered vessel to circumnavigate the globe. It began it’s voyage in Monaco in September 2010 and has so far stopped in Miami, Cancun and the Galapagos Islands. the yacht cost 12.5 million euros to build and is covered in more than 500 square metres of solar panels which power two electric motors. It can reach speeds of up to fourteen knots and holds up to 40 passengers.