China has commissioned the west tower of the world's first dual-tower, single-generator solar thermal power plant in Guazhou, northwest China's Gansu Province. More than 20,000 heliostats now concentrate sunlight onto a 200-meter-high receiver, heating molten salt from solid to liquid at over 200 degrees Celsius. The system can store heat at temperatures of up to 570 degrees Celsius, several times more efficiently than water, enabling it to generate clean electricity even after sunset.