China Wastes 360 TWh of Clean Power in H1 2026 as Grids Hit Limits

For the climate community, the clean-energy transition has long been framed as a race to build capacity. But China's 360 TWh of wasted renewable output in the first half of 2026 reveals a harder truth: capacity without grid capacity is stranded decarbonization. Every terawatt-hour curtailed is a terawatt-hour of fossil generation that keeps running — and with China's coal output set to rise again, the emissions math is moving in the wrong direction.

In the first six months of 2026, China discarded 360 terawatt-hours of wind and solar electricity — enough clean power to supply Mexico for an entire year — as its transmission networks reached their physical limits. The figure, published in an August report by Global Energy Monitor (GEM) and the Center for Research on Energy and Clean Air (CREA), represents a 49% jump from the same period a year earlier and exposes a structural weakness at the heart of the world's largest clean-energy buildout. The practice, known as curtailment, occurs when grid operators pre-emptively reject renewable output because the system cannot absorb it, and it is now spreading well beyond China's borders.

“

China's National Energy Administration (NEA) reported that just 8.6% of solar output and 9.1% of wind output was curtailed in the first half of 2026.

The scale of the problem is sharply contested. China's National Energy Administration (NEA) reported that just 8.6% of solar output and 9.1% of wind output was curtailed in the first half of 2026. But GEM and CREA, using weather-adjusted data to account for unreported curtailment, estimate that China actually rejected 26.1% of its total wind and solar generation during the same period. The gap matters enormously: if the independent researchers are closer to the truth, more than a quarter of China's zero-carbon electricity never reached a consumer. Notably, the NEA stopped publishing monthly curtailment data by province in March, a move that analysts say has made independent verification more difficult and reduced transparency around grid performance.

The causes are structural rather than incidental. Insufficient transmission infrastructure remains the primary constraint — renewable plants in China's wind- and solar-rich western regions are connected to grids that cannot move their output to demand centers in the east. Compounding the problem are supply contracts that guarantee the operation of newly built coal-fired power plants, which crowd out renewable dispatch even when clean power is abundant and cheaper. "Curtailment in China is structural, not a temporary bottleneck. We expect curtailment pressure to continue through the rest of this decade," said Yuan Ren, an analyst at consultancy Wood Mackenzie.

The consequences are already visible in investment data. Curtailment, combined with a new policy that removes the guaranteed fixed price for renewable generation, has contributed to a 66% drop in new solar installations in China this year. At the same time, China's coal-fired power generation is expected to rise again in 2026, reversing what had been a first-in-a-decade decline. The net effect is that China is simultaneously building more renewables and burning more coal, a paradox that undermines the emissions-reduction value of its clean-energy program and signals to developers that adding capacity is no longer a reliable route to revenue.

The problem is now global. India, the world's third-largest solar generator, curtailed 8.13 TWh of solar power in the quarter ended June, according to its renewable energy minister. Grid networks in Australia and Japan are also failing to keep pace with surging renewable buildouts, turning curtailment into a defining challenge of the energy transition worldwide. The pattern is consistent: renewable generation is scaling faster than the transmission, storage, and market mechanisms required to integrate it, and every country racing to decarbonize is now encountering the same physical ceiling.