Tûranor PlanetSolar Wikimedia Commons
The First Solar-Powered Ship To Circumnavigate The Globe Completes Its Trip -- Popular Science
The MS Tûranor PlanetSolar pulled into Monaco's Hercule Harbor on Friday, completing its journey around the world--the very first solely solar-powered watercraft to do so. Of course, it's not an ordinary ship. It cost over $16 million USD, has over 500 square meters of solar panels, and can house 200 people.
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My Comment: A top speed of 14 knots .... and 585 days to go around the world. Impressive (for a solar power boat) if you ask me.