Drones and robots make solar panels more efficient

Dust, pollen, and bird droppings can build up on solar panels and prevent them from absorbing the maximum amount of sunlight. A robotic cleaning crew ensures that solar panels at large power plants are spotless.

http://www.zdnet.com/article/drones-and-robots-make-solar-panels-more-efficient/?ftag=TRE5575fdc&bhid=25151283725937532891160407260705