- West, south carry heavy generation outage burden
- Coal stocks fall 27% m-o-m; critical plants rise sharply
India’s September power stress was not uniform across the country. BigMint’s analysis of Grid-India’s daily power-supply reports, CEA coal-stock data and six months of Indian Energy Exchange (IEX) hourly trading shows a widening regional mismatch between electricity demand, available generation, and fuel security.
Western and southern regions carried substantial generation outages, northern India combined high demand with the weakest coal position, while eastern and central India retained stronger fuel buffers. Inter-regional transfers and the electricity market helped bridge these differences, but the system’s margin for doing so narrowed as coal inventories declined.
Generation stress concentrated in west, south
Grid-India data show that 39-57 GW of generation was unavailable on several key September dates, although these outages include both central and state-sector capacity and should not all be attributed to coal constraints.
The western region repeatedly recorded the largest unavailable capacity. On 26 September, for example, the western region accounted for 17 GW of the country’s 51.3 GW of outages, followed by the northern region at 15.2 GW and the south at 12 GW.
But generation outage and electricity shortage are not synonymous. India’s interconnected transmission system allows electricity to flow from regions with available generation towards those facing deficits.
That makes September fundamentally a story of regional balancing.
North combines high demand with weakest coal buffer
The northern region was one of India’s largest demand centres and experienced highly variable generation availability. Outages ranged from around 7.5 GW on 19 September to more than 15 GW on 26 September.
More concerning was the region’s deteriorating fuel cushion.
By 30 September, northern plants held only 3.49 mnt of coal, equivalent to 27% of normative requirement, the lowest among the major regions. Twenty-six plants were classified as critical.
This did not mean every northern generation outage resulted from coal scarcity. Operational and equipment constraints affected some plants holding adequate fuel.
But low inventories reduced the region’s resilience and increased the importance of generation and electricity available elsewhere in the national grid.
South faces multiple generation constraints
The southern region faced a different combination of pressures.
Generation outages remained around 10-15 GW on several days, while Karnataka experienced weak hydro availability alongside thermal-generation constraints. Telangana also faced thermal and coal-supply pressures.
Meanwhile, southern region coal stocks ended September at only 4.06 mnt, or around 30% of normative requirement, the second-lowest position nationally.
The combination of relatively weak fuel buffers and substantial unavailable generation increased the importance of electricity transfers into the region whenever local generation could not meet requirements.
West becomes critical to national balancing
The west presents perhaps the most interesting regional paradox.
It repeatedly carried the country’s largest generation-outage burden, reaching almost 20 GW on 5 September. Yet the western region also has a large generation base and is connected through major transmission corridors to both northern and southern India. Consequently, an outage in the western region matters beyond western India’s own demand.
Capacity unavailable there potentially removes electricity that could otherwise support another stressed region.
The western region ended September with around 3.85 mnt of coal, equivalent to 38% of normative requirement, better than the northern and southern regions but with 20 plants already classified as critical.
East retains stronger buffer despite heavy burn
The eastern region provides the counterpoint.
Its thermal plants consumed around 16.26 mnt of coal during September but received only 14.14 mnt, producing the largest regional receipts-versus-burn deficit at approximately 2.13 mnt.
Yet the eastern region still ended September with around 5.16 mnt of coal, equivalent to 49% of normative requirement, the strongest position among the five major regions.
Central India was similarly better buffered at around 43%.
These regions therefore had greater capacity to draw down inventories while supporting generation — important not only locally but also for electricity moving through the interconnected grid towards more stressed regions.
Coal stocks finance Sep’26 generation
The national coal numbers show how rapidly this buffer was being consumed.
Power plants received 70.80 mnt during September but consumed 78.65 mnt, leaving a 7.85 mnt deficit.
Remarkably, receipts were below consumption on every day of September. Consequently, power-plant stocks fell from approximately 29.12 mnt at end-August to 21.25 mnt at end-September — a decline of 7.87 mnt or 27%. Critical-stock plants simultaneously increased from 51 to 84.
The near-identical 7.85 mnt receipts-consumption deficit and 7.87 mnt inventory drawdown show that existing stocks effectively financed September’s generation shortfall.
IEX becomes another balancing mechanism
The IEX data provide the market counterpart to these physical regional imbalances.
Average DAM purchase bids surged from 14,586 MWh in August to 42,811 MWh in September, while sell bids declined from 13,877 MWh to 10,745 MWh.
Average MCP consequently jumped 56.5% m-o-m to INR 6,906/MWh, despite average scheduled volume slipping slightly. The implication is significant.
As utilities facing inadequate local generation sought electricity elsewhere, they increasingly competed for the same pool of available generation. Inter-regional transmission moved the physical electricity while IEX provided one of the commercial mechanisms through which buyers accessed it.
The exchange therefore transmitted regional generation tightness into national price pressure.
BigMint assessment
September reveals a power system under pressure not from one nationwide shortage, but from different constraints occurring simultaneously across regions.
The north combined high requirements with India’s weakest coal buffer. The west carried the largest generation-outage burden while remaining strategically important to national power transfers. South faced overlapping thermal, hydro and coal constraints. Eastern and central India retained relatively stronger fuel buffers capable of supporting generation.
The grid and electricity market helped redistribute available power and prevented every regional generation outage from becoming an equivalent local shortage.
But the underlying cushion was shrinking.
With coal burn exceeding receipts by 7.85 mnt, inventories falling 27%, and critical plants increasing from 51 to 84, India’s ability to compensate for regional generation disruptions became increasingly dependent on where spare generation remained available, whether sufficient transmission capacity could move it — and whether those plants had enough coal to keep generating.
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