GUANACASTE, COSTA RICA - MARCH 26: A worker cleans the panels in a solar power park run by the Costa Rican Electricity Institute (ICE) as the power company has managed to produce all of the electricity for the nation from renewable energy sources for more than 80 days straight on March 26, 2015 in Guanacaste, Costa Rica. The milestone has been reached with the use of hydroelectric power plants and a combination of wind, solar, and geothermal energy. (Photo by Joe Raedle/Getty Images)
