The ultra-high voltage project from Gansu's Longdong to Shandong province fuels Shandong's green, low-carbon and high-quality development. [Photo/Dazhong News]

China's first "wind-solar-thermal-storage integration" ultra-high voltage project, the Longdong to Shandong ±800 kilovolt DC transmission project, successfully completed its 168-hour trial operation on May 5 and is now ready for official commissioning.

This project is not only a "green artery" for cross-regional energy allocation but also a crucial engine for Shandong's accelerated green and low-carbon development.

Shandong, an industrial powerhouse, is in urgent need of stable and green electricity to support its industrial transformation. The Longdong to Shandong project can transmit bundled coal, wind, and photovoltaic power from Gansu province to Shandong province, meeting about 4 percent of Shandong's annual electricity demand.

With a transmission efficiency so high that it takes just 0.003 seconds for electricity to travel from Gansu to Shandong, the project is expected to deliver over 36 billion kilowatt-hours annually, with green power accounting for 50 percent of the total.

The project's safety is of utmost importance. The Dongping converter station has piloted the application of fast AC circuit breakers with closing resistors for the first time in China, reducing fault clearance time to under 25 milliseconds. The project will also help Shandong reduce annual coal consumption by about 6 million metric tons and cut CO2 emissions by 16 million tons.