Current Affairs · · GS3 · Economy

Coal stocks critically low at many power plants as demand rises

About 85 of 191 thermal power plants monitored by the Central Electricity Authority had critically low coal stocks in early October 2026, up from about 20 a year earlier. The government says there is no national coal shortage. High demand, a weak monsoon and supply logistics have together squeezed plant-level stocks.

Event date:

REq1
  1. Context1 / 4
    • Central Electricity Authority (CEA) data show the number of thermal plants with critically low coal stocks rose sharply over August and September 2026, reaching about 85 of 191 monitored plants by early October.
    • The Coal Ministry says there is no shortage of coal nationally, pointing to adequate stocks at pitheads and in transit. Its view is that power demand rose sharply and that monsoon-season disruptions have since normalised.
    • The gap is between national coal availability and plant-level inventories. Coal can exist at the mine and still not reach the plant in time.
    • The 2026 southwest monsoon ended about 13% below its long-period average, the weakest since 2015, under El Niño conditions. Weak hydro output and high temperatures pushed more demand onto coal plants.
  2. Key highlights2 / 4

    The table below tracks the rise in plants with critically low stocks, from CEA data.

    Date (2026)Plants with critically low stockTotal plant stock
    End of July31–
    25 August45–
    9 September5925.84 million tonnes
    19 September7422.9 million tonnes, about 39% of normative, about 7 days' cover
    27 September8221.8 million tonnes, about 37% of normative
    Early October85–
    • Where the pinch is worst. Plants away from the mines, which depend on rail, hold a smaller share of their required stock than pithead plants. One CEA summary showed 56 of 72 critical plants attributing their shortfall to lower deliveries from a coal company.
    • Responses so far. The Coal Ministry increased rail rakes for the power sector, and the Power Ministry is reported to be weighing mandatory blending of imported coal.
    • Why coal still matters. Coal-fired plants generate most of India's electricity and supply the steady baseload power the grid needs when solar and wind output varies.
  3. Key concepts3 / 4

    1. What counts as a "critically low" coal stock?

    The CEA sets a normative stock that each plant should hold, measured in days of generation. A plant is flagged critical when its stock falls 25% below that normative level, or when it can run for fewer than three days. In September the norm is 12 days for pithead plants and 20 days for the rest.

    2. Why can stocks be low without a coal shortage?

    Coal that is mined but held at the pithead, or stuck in transit, does not help a plant that needs to burn it today. It is like a well-stocked warehouse with too few delivery trucks: the shelves at the shop still go empty. Rail capacity, monsoon disruption at the mines and loading delays all widen this gap.

    3. How do El Niño and the monsoon affect power?

    El Niño is a warming of the central and eastern Pacific that tends to weaken India's monsoon. A weak monsoon cuts hydropower output and raises cooling demand in hot weather, so more of the load falls on coal. Heavy rain in mining areas can also disrupt coal output and its movement.

    4. What are baseload and balancing power?

    Baseload is the minimum steady demand that must be met round the clock, and coal plants have traditionally provided it. Solar and wind vary with the weather, so the grid also needs generation that can step up when they dip. Until storage and grid flexibility grow, coal plays both roles.

  4. Way forward4 / 4

    These are suggested measures, not approved policy.

    • Enforce normative stocking before the monsoon, when disruption is predictable.
    • Strengthen coal logistics: rail rakes, dedicated freight corridors, and better coordination between coal companies, the railways and generators.
    • Diversify supply, using imported coal for blending where domestic movement lags.
    • Build storage and grid flexibility through batteries, pumped hydro and interstate transmission, so that renewable output can be shifted to peak hours.
    • Manage demand with time-of-day pricing and efficiency measures during heatwaves.
    • Continue the energy transition without giving up short-term reliability.

Sources

Syllabus

PaperSubjectSub-topic
GS3EconomyInfrastructure: energy; energy security
GS1GeographyMonsoon variability and extreme weather
PrelimsEconomyEnergy: coal, thermal power and renewable energy; the CEA and normative stock
PrelimsGeographyThe monsoon and El Niño

Topics

ClimatologyOceanographyIndustry

Practice questions

  1. With reference to coal stocks at thermal power plants, consider the following statements: 1. The Central Electricity Authority sets normative coal stock requirements for plants. 2. Pithead plants are generally required to hold more days of stock than plants far from mines. 3. Low plant-level stock can coexist with adequate national coal availability. Which of the statements given above are correct?

    1. 1 and 2 only
    2. 1 and 3 only
    3. 2 and 3 only
    4. 1, 2 and 3
    Show answer

    Answer: B. Statements 1 and 3 are correct. Statement 2 is wrong, and the norm runs the other way: a pithead plant is required to hold fewer days of stock, 12 days in September, than a plant far from the mines, which must hold 20 days, precisely because the distant plant depends on rail movement that can be interrupted.

    Difficulty: medium · statement

  2. Consider the following statements: 1. El Niño refers to warming of sea-surface temperatures in the central and eastern Pacific. 2. El Niño years are generally associated with a weaker Indian monsoon. 3. A weak monsoon tends to raise hydropower generation. Which of the statements given above are correct?

    1. 1 and 2 only
    2. 2 and 3 only
    3. 1 and 3 only
    4. 1, 2 and 3
    Show answer

    Answer: A. Statements 1 and 2 are correct. Statement 3 is wrong, and the relationship is the reverse: less rainfall means smaller reservoir inflows and therefore lower hydropower output, which is part of why a weak monsoon shifts more of the electricity load onto coal plants.

    Difficulty: easy · statement

Mains practice

Answer-writing practice on this article. Attempt it first, then open the hints.

  1. GS3 · 250 words

    India's coal stock pressures arise less from shortage than from logistics, demand and weather. Examine, and suggest measures to improve energy security.

    Show hints
    1. Draw the central distinction between national coal availability and the stock actually sitting at a plant, and explain why the second is what determines generation.
    2. Explain the logistics constraint: rail rakes, loading delays and monsoon disruption at the mines, and why plants away from the pithead are hit hardest.
    3. Bring in weather as a double pressure, with a weak monsoon cutting hydropower while heat raises cooling demand.
    4. Assess the short-term responses, including more rail rakes and the proposal to mandate blending of imported coal, and their limits.
    5. Conclude with structural measures: enforced pre-monsoon stocking, freight capacity, storage and transmission, and demand management.
  2. GS3 · 250 words

    Discuss the role of thermal power in India's energy transition and the conditions needed to reduce dependence on it without compromising reliability.

    Show hints
    1. Explain why coal currently carries both the baseload and much of the balancing role on the Indian grid.
    2. Set out the variability problem: solar and wind output follows the weather, and peak demand does not.
    3. Explain how battery and pumped storage shift renewable generation to the hours when it is needed.
    4. Cover transmission and the flexible operation of existing coal plants as the bridge during the transition.
    5. Conclude on demand-side measures such as time-of-day pricing, and on sequencing, so that reliability is not traded away before replacements exist.