For six straight months, Coal India's sales had been falling. Mild weather through late 2025 had kept power demand tepid, inventories were piling up at plants, and there seemed to be little urgency to burn more of the country's most abundant fossil fuel. Then, almost overnight, everything changed.

Coal India's offtake rose 0.7% to 69.5 million tonnes in March 2026, marking the first increase after six consecutive months of decline, even as its provisional output dipped 1.5% to 84.5 million tonnes in the same period. The numbers are modest on their own, but they signal something far larger. India is pivoting back to coal, hard and fast, just as summer arrives, and this time it is not just the heat driving demand. It is a war.

The Spark: A War That Choked the Gas Supply

The story begins not in India's coal mines, but in the Persian Gulf. On March 4, QatarEnergy declared force majeure on LNG deliveries following Iranian drone strikes that forced a shutdown of its 77-million-metric-ton-per-year Ras Laffan export terminal. QatarEnergy noted it would lose $20 billion in annual revenues from the attacks, with repairs potentially taking up to five years to complete.

For India, this was a direct gut punch. Qatar supplies 10 to 11 million tonnes per annum of LNG to India, around 45% of the country's total LNG import requirement. With that supply suspended and the Strait of Hormuz effectively closed to tanker traffic, Asian spot LNG prices surged from around $10/MMBtu before the conflict to $24 to $25/MMBtu, a near-doubling in a matter of days. Carrier freight rates soared from $40,000 to $300,000 daily, and global LNG prices jumped over 65%.

The cascade was swift. Petronet LNG, India's largest LNG importer, issued a force majeure notice to QatarEnergy and its offtakers, including GAIL (India), Indian Oil Corporation, and Bharat Petroleum, stating that the allocation of LNG quantities under its Qatar contract had been reduced to zero from March 4. India's gas supply chain was in crisis, and summer was right around the corner.

8 to 10 GW of Gas Power, Gone

To understand why this matters so much for coal, you need to understand how India uses gas in its power mix. India has about 20 gigawatts of gas-based generation capacity, which typically operates at just 6 to 10% utilisation due to costly LNG, but that figure rises to around 30% during peak summer months. During heatwaves, India leans on approximately 8 to 10 GW of gas power to keep the lights on, and that capacity has now essentially vanished from the equation.

A government tender for 12,000 megawatt-hours of gas-based power for the summer months received zero bids, a stark signal that the market had fully priced in the disruption. Every megawatt-hour that cannot come from gas must now come from somewhere else, and in India, that somewhere else has always been coal. India's Power Minister ordered coal-fired power plants to run at full capacity for three months starting April 1 to be prepared to meet peak power demand during the coming summer. The government has also instructed generators to bring coal plants back online from planned outages and postpone scheduled shutdowns, leaving no room for downtime as the hottest months approach.

A Record Summer Demand Is Coming

The urgency is compounded by what meteorologists and planners are already signalling. India is set to experience a hotter-than-normal summer this year, with heat wave days in May expected to be higher than the seasonal average. Peak power use could top out at 283 gigawatts during the most extreme periods, a 13% jump compared to the current record of 250 GW set in the summer of 2024.

There is also a structural wildcard adding to demand that goes beyond the weather. A shortage of LPG is causing a significant number of households to switch to electric cook stoves, with the power ministry acknowledging a potential 5 to 10% increase in residential power demand from this shift alone. This creates a dual pressure of higher daytime cooling demand and a new, steady evening load from cooking, two peaks that India's grid must now navigate simultaneously, with coal as the primary backstop for both.

Coal India's Buffer: Comfortable, but Not Unlimited

The reassuring part of this story is that India entered this crisis with coal stocks in considerably better shape than in previous energy crunches, such as the supply squeeze of 2022. As of March 9, 2026, coal available at power plants stood at 54.05 million tonnes, adequate for nearly 24 days at the present rate of consumption. The overall coal stock available in the country was about 210 million tonnes, adequate for about 88 days, according to the coal ministry. Coal India's producing subsidiaries were holding 115 million tonnes at pitheads as of February 26, 2026, a figure expected to rise further by the close of the fiscal year. India has also produced 1 billion metric tonnes of coal for a second successive year, which the government believes is enough to meet summer power demand.

Crisil Ratings offered some reassurance to markets as well. Even if peak demand reaches 250 to 260 GW this summer, India is unlikely to face material power cuts given ample coal, lignite, nuclear, hydro, and wind capacity, said Gautam Shahi, senior director at the firm.

But Risks Remain on the Ground

Even with adequate coal volumes, structural bottlenecks could create localised stress. Non-coking coal imports fell to 127.8 MT during April to January FY26, down from 141.18 MT in the same period a year earlier, while total coal imports dropped 4.2% to 213.1 MT. Rising shipping prices are expected to keep imports subdued going into the summer. Transmission infrastructure also remains a persistent weak link. India continues to face challenges with transmission networks for non-fossil sources, leading to curtailment of renewable energy production, which limits effective power availability in high-demand regions. Solar generation can cover afternoon demand, but as it declines through the day, coal is needed to fill the critical evening peak, a gap that is now entirely its burden to carry.

In FY2026 as of January 31, India added a record 52.5 GW of generation capacity from all sources, including over 39 GW from renewables, 10,241 MW in coal-based thermal power plants, 600 MW in nuclear, and 4,236 MW in large hydro projects, all of which will matter as summer demand climbs and the grid faces its toughest test of the year.

What It Means for Investors and Markets

For financial market participants, several threads are worth tracking closely. Coal India (COAL.NS) is the most direct play. The state-run company accounts for over 80% of India's coal production and is the world's largest coal miner by output. The March sales turnaround after a six-month declining streak suggests the worst of the offtake slump may be behind it, with summer likely to accelerate volumes further. NTPC is another name gaining attention, with Bernstein flagging it as a favoured pick in the power sector and predicting a demand surge in the latter half of 2026, driven by a low base and favourable weather.

Gas and fertiliser companies face a more complicated picture. Elevated LNG prices could translate into costlier gas supplies for fertiliser plants, potentially increasing the government's subsidy burden at a time when the fiscal position is already under strain from surging crude oil import costs. The LNG shock has also highlighted India's deep vulnerability to import dependency. In 2025, LNG accounted for 80% of gas demand from India's fertiliser industry and 36% of city gas consumption, sectors that cannot easily switch fuels on short notice and are now scrambling to manage costs in real time.

The Bigger Picture: Coal's Stubborn Resilience

India has ambitious clean energy targets. Renewable capacity is set to reach 251 GW, representing nearly 40% of installed capacity, and the country has pledged to reach 500 GW of non-fossil fuel capacity by 2030. And yet, every time a crisis hits, whether a heatwave, a war, or a supply shock, coal is what India reaches for. India's peak power demand is expected to rise to 459 GW by 2035 to 36, up from 289 GW in 2026 to 27, according to the Central Electricity Authority. That gap will be filled by a mix of renewables and new thermal capacity, but the transition remains gradual. Even as renewable capacity grows quickly, India plans to add 100 GW of new coal capacity over the next seven years.

The current crisis is, in many ways, a stress test of that transition. India is managing it: the buffers are holding, the government is acting decisively, and the grid appears capable of absorbing the shock. But the episode underscores a hard reality. In a country of 1.4 billion people, where energy security and economic growth are deeply intertwined, coal remains not just a legacy fuel but an active and indispensable one. This summer, as temperatures climb and air conditioners hum across a billion homes, it will be coal, not gas and not yet solar, that keeps India's lights on.