The Turanor PlanetSolar, the world's largest solar boat, travels on the Seine 

The Turanor PlanetSolar, the world's largest solar boat, travels on the Seine river as the Eiffel Tower is seen in background, in Paris, Tuesday, Sept. 10, 2013. The PlanetSolar with its 537 square meters of photovoltaic panel powering 6 blocks of lithium-ion batteries, accomplished the first around the world trip powered only by solar energy in May 2012. (AP Photo/Christophe Ena)
Associated Press
The Turanor PlanetSolar, the world's largest solar boat, travels on the Seine river as the Eiffel Tower is seen in background, in Paris, Tuesday, Sept. 10, 2013. The PlanetSolar with its 537 square meters of photovoltaic panel powering 6 blocks of lithium-ion batteries, accomplished the first around the world trip powered only by solar energy in May 2012. (AP Photo/Christophe Ena)
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