International thermal coal prices have pulled back from recent highs after a strong rally, pressured by China's policy signals on supply recovery and seasonal demand weakness.

Most of August saw international coal prices on a one-way upward trend, with Australia's Newcastle coal futures hitting a three-month high in early September. Since then, Australian coal futures have fallen more than 3% from those early September peaks, while Indonesian coal benchmark prices across grades have also begun to retreat.

The International Energy Agency (IEA) had said supply disruptions from Middle East geopolitical conflicts pushed up international gas and oil prices, prompting a greater shift toward coal-fired power generation. In its "Coal Mid-Year Update 2026" report released earlier this month, the IEA projected global coal demand would grow 1.2% in 2026, reversing a previous forecast of a slight decline.

However, after a strong rally, the international coal market has seen a high-level correction. ICE Newcastle coal futures fell from near $149/t on September 4 to around $144/t recently.

Meanwhile, Indonesian coal benchmark prices across grades have generally moved lower. In the latest HBA prices released by Indonesia's Ministry of Energy and Mineral Resources, most coal grades were cut, with reductions generally ranging from 1.2% to 2.9%. This price correction is the result of improved supply-side expectations combined with seasonally weaker demand.

First, China's domestic policy intervention signals are clear, raising expectations for supply-side recovery. After a coal mine accident in Shanxi in May, nationwide safety inspections caused domestic coal output to plunge. In June, raw coal output from industrial enterprises above designated size fell 9.7% year on year, the largest single-month decline in nearly a decade. The output contraction pushed domestic coal prices to multi-year highs. In the first ten days of September, the CCI index for 5,500 Kcal/kg NAR coal at Qinhuangdao port reached 990 yuan/t.

Recently, however, the central government has called on coal-producing regions to accelerate safe resumption of production and supply recovery, requiring local miners to ensure adequate output. This policy signal quickly shifted market expectations. As the world's largest coal producer, China's output recovery will directly ease the core supply anxiety that had supported international coal prices. The market reacted immediately, and seaborne coal prices also retreated from highs.

Second, on the demand side, the end of the summer coal consumption peak in the Northern Hemisphere has weighed on coal consumption. Customs data showed China's coal imports in August were 42.09 million tonnes, down 1.49% from July. With thermal coal demand for power generation seasonally declining, if domestic output recovers in tandem, the urgency to purchase imported coal will drop significantly, and September imports may come under further pressure.

Market participants said that after the recent sustained price rally, Chinese buyers have become more cautious, with lower acceptance of high-priced imported coal and adopting a just-in-time procurement strategy. Increased demand-side price sensitivity has weakened the momentum for further coal price gains.

Third, as alternative energy prices loosen, the marginal demand for coal-to-power substitution has weakened. A key driver of the earlier international coal price rally was the LNG supply disruption caused by Middle East conflicts, which sent natural gas prices soaring and prompted consumers in Japan and South Korea to switch to coal-fired power, boosting coal demand.

However, according to market sources, Iran has begun negotiations with neighboring countries, raising expectations for an easing of geopolitical tensions. Spot LNG prices in Northeast Asia have fallen from mid-September highs to around $27/MMBtu. Although prices remain at historically high levels, expectations for further spikes have diminished, narrowing the marginal room for coal-to-power substitution demand. Some Asian power utilities, with relatively ample inventories, have reduced their willingness to purchase high-priced coal.

Additionally, another marginal change on the supply side comes from Indonesia. Previously, drought caused by El Nino severely hindered coal barge transport in Kalimantan, which was one factor pushing up coal prices. Recently, with partial improvements in mining and logistics conditions, Indonesia's coal supply availability has improved.

Meanwhile, some coal companies that had previously issued force majeure notices after failing to obtain production increase approvals from the Ministry of Energy and Mineral Resources are also expected to raise output. It is understood that three subsidiaries of Indonesia's Bayan Resources have obtained additional production quotas of 15-20 million tonnes. Data from the ministry showed Indonesia's coal output reached 423 million tonnes in January-July, equivalent to about 60 million tonnes per month. At that pace, full-year output would be approximately 720 million tonnes, well above the target of around 600 million tonnes set at the start of the year.

Overall, the recent decline in international coal prices is essentially a correction of the earlier rapid rally. China's policy intervention signals and seasonally weaker demand are the main downward drivers, with loosening alternative energy prices providing marginal support.

From a longer-term perspective, however, supporting factors such as LNG supply disruptions from Middle East conflicts, Indonesian supply constraints and the resilience of global coal-fired power demand are unlikely to fundamentally fade in the near term. Therefore, this pullback is more likely to manifest as a high-level consolidation rather than a trend reversal.