Gizmag has an article about the Frisian Solar Challenge that took place last summer in Friesland, a northern province of Holland. There isn’t a lot of info about the race itself, but the photos are cool. The race has its own site as well. This 220 km race mimics the path of a historic ice skating race through 11 cities. Winning boats complete the race in a little under 17 hours, cruising just over 13 km/h (8.1 mph).