Chinese grid company State Grid Corporation of China (SGCC) has commissioned the world’s first ±1,100 kV ultra high voltage direct current project at an investment of CNY 40.7 billion. The project spans 3,293 km, linking the Changji converter station in Changji Hui Autonomous Prefecture in Xinjiang in the northwest and Guquan in Anhui province in eastern China, and has 12 GW of transmission capacity. The transmission line crosses the provinces of Xinjiang, Gansu, Ningxia, Shaanxi, Henan and Anhui. It will enable the supply of 66 BUs of electricity from Xinjiang, one of China’s five major energy bases with resource potential to construct large-scale coal and wind power plants, to East China every year to meet the electricity demand of 50 million households. ABB and Siemens supplied converter transformers for the project. The project received approval in December 2015 and construction works began in January 2016.