The Longdong-Shandong ±800 kilovolt ultra-high voltage (UHV) direct current (DC) transmission project was completed and put into operation on May 8. This project is a major energy artery of China’s west-to-east power transmission program, starting from Qingyang in Northwest China’s Gansu Province to Tai’an, East China’s Shandong Province. It adopts ±800 kV rated voltage and a rated capacity of 8 million kilowatts, with a transmission distance of 915 kilometers and a total investment of 20.2 billion yuan ($2.88 billion).
The project set four national “firsts”: the first UHV DC outbound transmission project integrating wind, solar, coal, and storage, the first UHV DC project commissioned at full-capacity operation in one go, the first demonstration project to explore and apply standardized "dual 800kV" UHV DC technical achievements, and the first demonstration project to apply breakthroughs from national key research programs to overcome critical UHV DC bottleneck technologies.
It can transmit 36 billion kilowatt-hours of electricity annually from Gansu to Shandong, significantly enhancing Shandong’s energy and power supply security. It strongly supports the construction of large-scale wind and solar photovoltaic bases in deserts, the Gobi and barren lands, and the utilization of new energy, ensuring the reliable transmission of over 10 million kilowatts of installed renewable power.
