Photos: A day at the solar boat races

Solar-powered boats race over rivers, lakes, canals and waterways at the Frisian Nuon Solar Challenge in the Netherlands from June 26 to July 1. Boats follow the 136 mile route of the Frisian Eleven Cities ice skating race in a quest to promote alternative energy resources.

The guiding rule of this race is that the boats can be powered by only solar energy. Assistance from wind, humans or animals is strictly forbidden.

Photo by FNSC Solar Challenge