On 28 May 2024 Carbon Brief published an analysis by Lauri Myllyvirta of the Centre for Research on Energy and Clean Air showing that China's carbon dioxide emissions fell by 3 per cent year on year in March 2024. It was the first monthly decline since China lifted its zero-Covid controls in December 2022, and it ended a fourteen-month run of growth. The analysis argued that China's emissions could have peaked in 2023.
A single month is thin evidence for a structural turning point in the world's largest emitter. It is not, however, a statistical accident. The composition of the decline tells us more than its size, and on our reading it points to a peak that is plausible but conditional on two things that are not yet secured: continued record clean power additions, and continued weakness in construction.
What fell, and what did not
The March decline came from three sources. Coal use fell by 1 per cent. Oil demand was flat. Cement production dropped by 22 per cent. Gas consumption actually rose by 14 per cent, but gas remains a minor part of China's energy mix, so the increase did little to offset the other movements.
The power sector is the most telling part. Power sector emissions rose by only 1 per cent year on year in March, even though electricity demand kept climbing, partly because households bought more air conditioners. According to the analysis, solar and wind generation covered almost 90 per cent of the growth in electricity demand. That is the mechanism that matters. As long as new clean generation meets nearly all incremental demand, coal burn in power plateaus.
Construction did the rest. Weakness in the property sector cut demand for steel and cement, and Carbon Brief's China briefing of 30 May puts the resulting reduction in construction emissions at 30 million tonnes of CO2. That is a cyclical driver, not a policy choice, and cyclical drivers can reverse.
The base effect problem
Myllyvirta's analysis is explicit that the first quarter as a whole still showed higher emissions, because January and February 2024 were being compared with the subdued months immediately after reopening. March is treated as the first clean comparison. That is a fair methodological choice, but it also means the evidence for a peak rests on one data point that is free of distortion. A second and third month of decline would carry far more weight than the first.
Why the clean power argument is stronger than it looks
The analysis notes that almost 300 GW of solar and wind capacity was connected in 2023, and that the pace accelerated further in the first quarter of 2024, with additions up 40 per cent on the year before. It also notes that distributed solar made up 45 per cent of last year's solar additions. This is the structural element of the story.
The simple arithmetic is that China's power demand growth, which has been running at several per cent a year, now has a clean generation pipeline large enough to cover it. Once that holds, power sector emissions can only rise if demand growth accelerates sharply or if hydro output collapses in a drought year. Neither is impossible. Both are weather or macro shocks rather than trends.
The analysis also points out that industry associations such as the China Photovoltaic Industry Association expect solar and wind additions to 2030 to exceed official targets by between 1,400 and 1,800 GW. If clean generation from the higher forecasts replaced coal, the difference in emissions would amount to 10 to 15 per cent of China's current total. That is a large gap between what the government has formally committed to and what the industry expects to build.
Why the construction argument is weaker
The construction slump is doing a substantial share of the work in the current numbers. A 22 per cent fall in cement output in a single month is not a pace the economy can sustain without consequences for growth, local government finances and employment. Policymakers have every incentive to stabilise housing. If they succeed, the cement and steel contribution to falling emissions will shrink, and the power sector will need to carry more of the load.
That is where our position becomes more cautious than the headline. A peak driven by clean power is durable. A peak driven by a property slump is not. At the moment China's emissions path depends on both.
The carbon intensity gap
There is a policy dimension that the March figure does not resolve. China's carbon intensity target, part of its Paris Agreement pledge, calls for falling emissions per unit of GDP. The analysis states that China is already severely off track to meet it. Meeting it depends on clean energy growth continuing to exceed the central government's targets, or on those targets being raised.
This has a practical implication. If Beijing wants to meet its intensity commitments, it has a strong reason to let renewable deployment run ahead of official targets, rather than slowing it for grid or industrial reasons. The tension between the grid operators, who would like a slower and more orderly build, and the climate commitments, which require a faster one, will shape policy through 2025.
What would confirm a peak
Three signals would move a 2023 peak from plausible to probable. First, further monthly declines through the summer, when air conditioning load is high and hydro output is variable. Second, continued solar and wind additions at or above the 2023 pace through the second half of 2024. Third, evidence that coal power generation is falling in absolute terms across a full quarter, not just growing more slowly.
Signals against would be a sharp rebound in construction, a dry summer that forces coal plants to make up for lost hydro, or a slowdown in installations as grid connection queues lengthen.
Our position
China's March emissions fall is real and its causes are partly structural. Clean power is now large enough to meet nearly all new electricity demand, and that changes the long-run trajectory. But the month also benefited from a construction slump that policymakers are actively trying to reverse.
The fair conclusion is that China's emissions may have peaked in 2023, and that the probability rises with every month in which renewables meet demand growth. The less fair conclusion, that peak has been proven, should wait for a full year of data. For investors and policymakers outside China, the operational message is simpler: the growth of Chinese coal demand for power, which has driven seaborne coal markets for two decades, is now structurally capped by clean capacity, even if the peak itself has not yet been confirmed.