China nears finish of world's first flexible ultra-high-voltage power line
Built WorldInspections done on Fuchun River crossing of the 2,370-km Gansu-Zhejiang direct current project
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Overview
Updated 1 hour agoInspectors wrapped up checks on the Fuchun River crossing of China's Gansu-Zhejiang ultra-high voltage (UHV) power line on September 5. The milestone edges the 2,370-kilometer project closer to commissioning, making it the world's first UHV direct current (UHVDC) link to use flexible DC technology at both the sending and receiving ends.
The line will carry wind and solar power from Gansu's desert plains to Zhejiang's factories and data centers, delivering an estimated 36 billion kilowatt-hours of clean electricity each year. It's part of a national push to add 15 new UHVDC lines by 2030, raising total transmission capacity past 420 gigawatts, and completing a grid that already moves over 70% of China's inter-regional power.
Why it matters
How China's UHV grid expansion balances renewables against coal will shape the world's largest electricity system for decades.
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People Involved
Organizations Involved
China's monopoly grid operator and the builder of record for the UHV network.
Leads tower design and line construction across segments in Henan.
Timeline
September 2025 September 2026
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Inspections completed for Fuchun River crossing section
Today Quality assuranceInspectors sign off on the Fuchun River crossing section, confirming the stringing work meets technical standards ahead of energization.
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Yangtze River crossing north tower tops out at 196 m
ConstructionAfter 69 days of work, the 196-meter north tower of the Yangtze River crossing reaches full height in Wuwei, Anhui, clearing a key obstacle on the route.
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State Grid completes Fuchun River crossing stringing
ConstructionThe Fuchun River-crossing stringing operation finishes in Hangzhou, a critical step for carrying the line over the waterway into Zhejiang's industrial core.
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Anhui section enters conductor stringing phase
ConstructionWorkers begin stringing conductors for the Gansu-Zhejiang line in Nanling County, Wuhu, moving the 2,370-km corridor into its final assembly stages.
Historical Context
2 moments from history that rhyme with this story — and how they unfolded.
Three Gorges Dam and the original west-to-east grid (2003)
China's Three Gorges hydro project spawned a wave of eastward transmission lines carrying power from Hubei to the Yangtze River Delta and Guangdong. It was the first large-scale institutional test of moving bulk electricity across provincial borders.
Proved long-distance electricity transport could ease eastern shortages and created the institutional template for interprovincial power trading.
The corridor planning and grid architecture UHV lines now rely on grew directly from this era.
Gansu-Zhejiang follows the same logic—generate where resources are, consume where people are—but swaps hydro for wind and solar, which introduces intermittency that the original baseload model never had to manage.
China's first UHV line (2009)
China energized its first UHV transmission line, a 1,000-kilovolt alternating current link from Jindongnan (Shanxi) to Nanyang (Henan) to Jingmen (Hubei). It proved the country could move bulk power hundreds of kilometers at voltages no other utility had deployed commercially.
Established China as the only country operating UHV at commercial scale and launched the national west-to-east transmission strategy.
By end of 2025, China had commissioned 45 UHV lines totaling 52,300 kilometers, carrying over 70% of inter-regional power transmission capacity.
The Gansu-Zhejiang line inherits this national buildout but adds a structural change: flexible DC technology at both ends, designed to handle the variability of wind and solar rather than steady baseload flow.
