SolarWorld worker

The dedication of the Gut Erlasee Solar Park came shortly before Monday's start of the 21st European Photovoltaic Solar Energy Conference and Exhibition in Dresden. Conference organizers expect 2,500 scientists, politicians and industry representatives as interest continues to rise in solar energy, which last year accounted for worldwide revenue of $7.5 billion and a growth rate of 40 percent. In this picture, a worker at German company SolarWorld cleans solar cells.