- Power plant coal stocks continue shrinking despite easing power demand
- CIL’s production improves in Sep’26, but coal movement remains key
India’s electricity system continues to meet aggregate demand, but beneath the headline numbers, the operating buffer has become unusually thin.
Thermal power plant (TPP) coal stocks fell to 22.41 mnt on 23 September, only 38% of normative requirements, even as electricity demand moderated from the exceptionally high levels seen earlier in the month. The number of plants classified as critical has risen to 77.
Meanwhile, India’s Day-Ahead Market (DAM) shows a striking contrast between abundant daytime electricity and extremely tight supply during non-solar hours.
This does not indicate a national power shortage. Rather, when coal inventories, hydro availability and flexible generation buffers are thin, relatively small disruptions involving rainfall, transportation or coal quality can produce disproportionately large local consequences.
Coal stocks continue shrinking despite easing demand
CEA data show TPP inventories continuing to decline.
Over these four days, plants consumed around 10.58 mnt but received only 10.09 mnt, drawing another roughly 0.5 mnt from inventories.
Significantly, this occurred while electricity demand was moderating. Maximum demand met declined from around 248.1 GW on 21 September to 238.2 GW on 24 September, while coal generation eased from around 3.89 TWh on 22 September to 3.60 TWh on 24 September.
Lower demand and coal burn should provide an opportunity to rebuild inventories. So far, that has not happened.
CIL production improves, but coal movement remains key
The mine-end picture is becoming more encouraging.
Coal India’s September month-to-date (MTD) production has reached 42.70 mnt, 3.5% above its MTD target of 41.24 mnt and 9.7% higher y-o-y. MCL produced 14.22 mnt, 18% above target and 22.1% higher y-o-y. SECL is 9.1% ahead of target, while WCL is almost 42% above its September MTD target.
The FYTD picture remains weaker. CIL has produced 310.11 mnt against a target of 337.87 mnt, leaving production 27.76 mnt, or 8.2%, behind target.
The immediate divergence is therefore notable: September mine production has recovered strongly, but power-plant inventories continue falling. This points increasingly towards evacuation, location, linkage and coal quality as the immediate constraints rather than simply aggregate coal availability.
Bokaro shows how quickly disruption can bite
Heavy rainfall has disrupted coal transportation to four generating stations around Bokaro, affecting Bokaro Power Supply Company, Tenughat TPS, Bokaro TPS and Chandrapura TPS.
Tenughat reportedly had around 30,000 tonnes (t) of coal, sufficient for only 4-5 days. Receipts had fallen to roughly 3,200 t/day against requirements approaching 7,000 t/day at full operation, contributing to sharply lower generation.
The national grid can absorb an incident of this scale. But with dozens of plants already holding critical inventories, rainfall or transportation disruptions that might normally be manageable can rapidly become operationally significant locally.
Telangana highlights coal-quality constraints
Telangana illustrates a different vulnerability.
The state government has sought supplies from Coal India and Mahanadi Coalfields after generation at Yadadri Thermal Power Station was affected by shortages of suitable coal.
The requirement is specifically for G9-grade coal, which officials said Singareni Collieries cannot currently provide from its blocks.
This demonstrates why national production and stock numbers cannot be viewed in isolation. A plant can face shortages even when substantial coal is available nationally because the required grade is unavailable locally, supplying mines are distant, or transportation is constrained.
IEX reveals where the system is tight
The latest IEX data provide perhaps the clearest indication of reduced flexibility.
Average purchase bids almost halved between 21 and 24 September, yet average MCP declined only around 5%.
More revealing is the intraday pattern. On 24 September, sell bids at 13:00 reached 36,734 MWh against purchase bids of 19,759 MWh, pushing MCP to just INR 1.86/kWh.
By 17:00, MCP had surged to INR 9.10/kWh. From 18:00 onwards, it reached the INR 10/kWh ceiling. At 20:00, purchase bids stood at 45,432 MWh against sell bids of only 777 MWh.
The message is clear: electricity is not scarce throughout the day; flexible electricity becomes scarce when solar generation disappears.
A system with less room for error
Renewables are providing significant daytime support, but weaker hydro availability means coal remains the principal shock absorber once solar output falls.
India is not facing an aggregate coal shortage. CIL production is recovering, electricity demand has moderated, and coal burn is easing. These conditions should eventually allow inventories to rebuild.
But that recovery has not yet started.
Coal receipts remain below consumption, inventories have fallen to 22.41 mnt, and 77 plants are critical. Bokaro demonstrates the impact of weather and transportation disruption; Telangana highlights coal-grade and sourcing constraints; IEX exposes the scarcity of flexible evening generation.
The issue is therefore not whether India’s grid can meet aggregate demand. It continues to do so. The issue is how much redundancy exists when something goes wrong.
A convincing improvement requires daily coal receipts to consistently exceed the current 2.5-2.6 mnt/day consumption rate, followed by rising inventories and fewer critical plants.
India’s power system is not in crisis, but its cushion has become thin. In such conditions, relatively small local disruptions can have consequences far greater than their size would normally suggest.
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