Changji–Guquan ±1,100 kV UHVDC
The highest-voltage, highest-capacity, longest HVDC link on Earth — the ceiling of what transmission engineering has achieved.
Footage · Hitachi Energy · YouTube
±1,100 kV
Voltage
Highest DC voltage class commercially deployed
12 GW
Capacity
Largest single HVDC bipole capacity built
approx. 3,293 km
Route length
Xinjiang (Changji) to Anhui (Guquan/Wannan)
2
Converter stations
Changji (sending) and Wannan (receiving)
approx. CNY 40 bn
Estimated cost
Publicly cited State Grid investment figure
5
Provinces crossed
Xinjiang, Gansu, Ningxia, Shaanxi, Henan, Anhui corridor
2014
State Grid approves the Changji–Guquan corridor to move Xinjiang generation to eastern China.
2016
Construction begins on converter stations and the 3,293 km DC line across five provinces.
2018
Key converter transformers and valve halls for ±1,100 kV rated equipment are type-tested and installed.
Sep 2019
Line energised and commissioned, becoming the world's first ±1,100 kV UHVDC scheme.
2020-2022
Line ramps toward rated 12 GW transfer, supporting Xinjiang coal-plus-renewable export targets.
The Changji–Guquan ±1,100 kV UHVDC link is the world's highest-voltage, highest-capacity, longest HVDC corridor, moving 12 GW of Xinjiang coal and renewable power 3,293 km to load-centre Anhui. For Indian planners eyeing multi-gigawatt renewable evacuation from Rajasthan, Gujarat, Ladakh or the North-East to southern/eastern demand centres, it is the reference case for what UHVDC can technically and financially achieve, and what it costs in land, converter engineering, and grid-integration planning.
India's own ±800 kV and emerging ±1,100 kV-class ambitions (e.g., Ladakh, Rajasthan, Leh-Kaithal and future Gujarat/Rajasthan RE corridors) face similar decisions: voltage-class economics over long distances, multi-state ROW coordination, and bankability of single mega-corridors. CEA and CTU planning for green energy corridors-II can benchmark loss reduction, redundancy norms, and technology-localisation clauses from this project when structuring tariff-based competitive bidding (TBCB) for future UHVDC lines connecting renewable-rich states to demand centres.
Engineering, procurement and finance lessons
01
Voltage class drives losses, not just cost
Stepping up to ±1,100 kV cut per-km losses versus ±800 kV lines, justifying higher converter and insulation cost over a 3,000+ km route. Indian corridors above 1,500 km moving 4-8 GW should model ±800 kV vs higher classes on lifecycle loss savings, not upfront capex alone.
02
Single-corridor risk needs redundancy planning
A 12 GW single bipole concentrates enormous generation-adequacy risk on one asset. Indian tenders bundling multiple renewable zones onto one UHVDC spine should mandate N-1 contingency studies, dynamic reactive support, and phased commissioning to avoid stranding gigawatts on outage.
03
Land and right-of-way sequencing determines schedule
Five-province routing required early land acquisition and inter-provincial coordination years before energisation. Indian project sponsors must lock ROW, forest and tribal clearances, and state MOUs before EPC award, not concurrently, to protect the 4-5 year build timeline UHVDC demands.
04
Converter technology localisation affects bankability
State Grid used indigenous ±1,100 kV valve and transformer technology, reducing import/forex exposure. Indian developers relying on imported converter stations should negotiate technology-transfer and spares-localisation clauses into EPC contracts to de-risk long-term O&M financing.
05
Renewable-plus-thermal bundling supports utilisation
The link blends coal and renewable output from Xinjiang to guarantee high load factor for the DC asset. Indian RE-heavy corridors (solar/wind) should pair with storage or firm capacity contracts so lenders see predictable utilisation rather than intermittent-only cash flows.
Sources · State Grid Corporation of China · IEEE Spectrum · Reuters · Global Transmission Report · China Daily
- Advise developers and lenders on ±800/±1,100 kV corridor techno-economics, loss modelling, and route risk for India's green energy corridor tenders.
- Structure EPC and financing packages with technology-localisation, spares, and O&M clauses drawn from global UHVDC precedents.
- Support utilities and PPP consortiums on multi-state ROW sequencing, contingency planning, and renewable-plus-firm-capacity bundling for large DC evacuation projects.