Photo taken on July 28, 2015 shows the second project of photovoltaic power system under construction in Zhonglitenghui photovoltaic power station in Shizuishan City of northwest China's Ningxia Hui Autonomous Region. Shizuishan City developed clean power to reduce the press of power supply and also consumption of coal in 2014. (Xinhua/Peng Zhaozhi)