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China's world-leading renewable megabases rely on coal-heavy transmission, report finds

Coal stockpiles

Coal stockpiles

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21st July 2026

By: Reuters

  

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BEIJING - China is building more large-scale wind and solar than the rest of the world combined, but inadequate transmission links and a continued reliance on coal-fired power are limiting its use, according to a report published on Tuesday.

Wind and solar make up around 20% of the power sent through China's ultra-high voltage direct current (UHVDC) transmission network, little changed since 2021, while 42% is from coal, the Global Energy Monitor said.

Under China's energy megabases policy, green power is generated in the sparsely populated north and northwest and sent via UHVDC transmission lines to power cities and factories in the east.

Some 315 GW of megabase capacity will need outbound transmission by 2030, requiring 27 UHVDC lines, the report said. China aims to have ten under its five-year plan for 2026 to 2030.

The current 11 proposed transmission lines dedicated to megabases combine 129 GW of wind and solar with 40 GW of coal, and the projected electricity mix is split almost evenly between coal and renewables, the report said.

The high proportion of coal is hard to square with policymakers' framing of coal as having only a supporting role in China's power system, said report author Aiqun Yu, senior East Asia strategist for GEM.

Yu said renewables bases should use energy storage technologies to back up intermittent renewables, instead of coal.

For example, a proposed UHVDC line from Inner Mongolia's Kubuqi to Shanghai has renewables making up more than 60% of the planned transmission volume, backed up by 9 000 MWh of energy storage and 2.64 GW of coal where other similar projects have 4GW. "This is a small step forward," Yu said.

As of June, China had 664 GW of solar planned or under construction, making up one-third of the global total, the report found. China has 698 GW of proposed wind capacity, or one-quarter of the global total.

Edited by Reuters

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