India's coal market faces stress test as heatwave demand surges amid weak domestic production

• Heatwave boosts coal demand outlook
  
  
• Falling stocks raise supply concerns
  
  

India's thermal coal market is showing early signs of tightening as an intensifying heatwave, weaker domestic production growth and lower hydro generation prospects begin to place renewed pressure on fuel availability ahead of peak summer demand.

The country is confronting a challenging combination of rising electricity consumption and slowing supply growth at a time when coal inventories are already beginning to thin out across thermal power plants.

Heatwave demand begins to tighten system

The tightening is emerging as India experiences an early and widespread heatwave, driving stronger cooling demand across multiple regions. At the same time, weather forecasts increasingly point toward El Nio-linked risks that could weigh on hydroelectric output during the coming months, further increasing dependence on coal-fired generation.

Signs of stress are already beginning to emerge in parts of the system, particularly during evening and night-time hours when renewable generation drops sharply after sunset, forcing thermal power to shoulder a larger share of demand.

Coal stocks fall faster than headline numbers suggest

Coal stocks at thermal power plants (TPPs) fell to around 49 million tonnes (mnt) as of 28 May, down 6% w-o-w and 17% lower than the same period last year. While headline inventory levels still appear relatively comfortable, a closer examination suggests the market may be more fragile than it initially appears.

On a comparable basis, operational stocks of roughly 23.2 mnt are now only about 20% above seasonal averages for May, a significant moderation from the nearly 40% surplus recorded in March. More importantly, supply stress is becoming increasingly visible at the plant level, with 21 power stations now holding one week or less of coal inventory.

CIL's poor performance raises supply concerns

Supply-side trends offer little immediate comfort. Tentative April production of Coal India Ltd (CIL) stood at around 56.1 mnt, down sharply by 34% m-o-m and nearly 9.7% y-o-y. While some slowdown is seasonally normal following year-end production pushes, the magnitude of the decline appears steeper than historical patterns.

If confirmed, cumulative Coal India output during January-April would be lower by around 4.7 mnt compared with the same period last year, raising concerns over whether domestic production can comfortably keep pace with stronger summer demand.

Coal India has reportedly instructed subsidiaries to accelerate production and dispatches, but logistical pressures are simultaneously building. Railway movement remains stretched during periods of elevated electricity demand, increasing the risk that pithead stock accumulation may not fully translate into timely deliveries to inland consumers.

Imports may need to return faster than expected

India's thermal coal imports during January-April stood at around 50.5 mnt, down 11% y-o-y as buyers continued to exercise caution amid expectations of softer seaborne prices and comfortable domestic inventories earlier in the year. Current projections suggest H1-2026 imports could decline to around 80.5 mnt, nearly 7 mnt lower than last year.

However, those assumptions are becoming increasingly vulnerable.

Should weekly stock depletion accelerate beyond roughly 2 mnt per week, import requirements may need to be revised sharply higher, particularly as lower hydro availability coincides with sustained thermal demand. Under such a scenario, Indian buyers delaying procurement in anticipation of lower prices could find themselves returning aggressively to the market during July.

Underestimating India's coal risk?

The tightening backdrop may also strengthen the negotiating position of Indonesian and South African suppliers, particularly for prompt cargoes, as sellers increasingly resist discounting into a market where downside risks to Indian demand appear to be diminishing.

Russia, meanwhile, continues to gain share in India's thermal coal basket, with shipments during January-April rising around 19.6% y-o-y to 2.2 mnt, highlighting a gradual diversification of supply sources amid changing trade economics.

The broader implication for the market is becoming clearer: India's coal balance may be considerably tighter than headline stock levels currently suggest. A combination of lower hydro generation, weaker-than-expected domestic output and rising electricity demand could yet force a reassessment of import needs before the first half of the year concludes.