PlanetSolar, the world’s largest solar-powered boat, was
unveiled recently in Germany. The 102-foot catamaran is
scheduled to soon begin testing ahead of its planned
round-the-globe journey, which starts in early 2011. Planned
U.S. stops include New York City and San Francisco,
California.

Source: http://www.eere.energy.gov/news/news_detail.cfm/news_id=15838