Combine expensive but efficient multijunction solar cels with lenses as lenses are cheaper to make than solar cells with the same surface area. This system is capable of converting almost twice the available sunlight into electricity as compared to conventional silicon-based systems. A cell consists of stacked layers of gallium indium phosphide, gallium indium arsenide and germanium in layers, which allows it to capture the sun’s almost entire energy. Cells measure 3 mm in diameter and are combined with lenses that concentrate light by a factor of 500. This principle only works with direct solar radiation (Sahara, Spain). Power plants of 10+ MW already are in operation.