Strait of Hormuz closure: biggest oil shock 2026

What happened and why markets are alarmed

The U.S.-Israeli war with Iran and the closure of the Strait of Hormuz have triggered the biggest oil supply disruption on record when measured by daily output lost, according to Reuters calculations based on International Energy Agency (IEA) and U.S. Department of Energy data. The IEA said the conflict amounts to the worst energy crisis the world has faced when combined with the tail end of the European gas crisis linked to Russia’s 2022 invasion of Ukraine. The disruption has revived comparisons with the 1973-74 Arab oil embargo, the 1978-79 Iranian Revolution, and the 1991 Gulf War. The comparison matters because the structure of energy markets has shifted since the 1970s, with deeper trade integration and higher exposure of downstream industries to fuel and feedstock shortages. The crisis has also underscored the Strait of Hormuz as a systemic vulnerability, not only a shipping route.

IEA view: a multi-commodity shock, not just crude

Unlike earlier crises that were more concentrated in crude oil, the current conflict has simultaneously hit crude, natural gas, refined fuel, and fertiliser supplies. The Reuters report highlights how this exposes vulnerabilities built over decades of rising demand and more complex global supply chains. The Middle East’s expanded role as a supplier of finished fuels and industrial inputs has raised the stakes for import-dependent regions. In earlier shocks, the most visible stress was often fuel availability for motorists in industrialised nations, particularly the United States. This time, early pressure points have shown up in supply to Asia and Africa, reflecting how demand centres and trade routes have evolved.

How the disruption compares with past oil shocks

The IEA said the outright daily supply loss in the current disruption is larger than earlier peak supply losses of 4.5 million barrels per day (bpd) during the 1973-74 Arab oil embargo and 5.6 million bpd during the 1978-79 Iranian Revolution. It is also higher than the estimated peak supply losses of 4.3 million bpd during the 1991 Gulf War. While the current event leads on peak daily loss, Reuters calculations indicate at least one earlier shock had a larger cumulative impact.

Cumulative losses: why the Iranian Revolution still stands out

The IEA estimates the Iranian Revolution led to a peak loss of 5.6 million bpd, smaller than the current disruption by peak daily measure. However, Reuters calculations based on U.S. Department of Energy data suggest the cumulative impact was larger. The Energy Department estimates an average drop of 3.9 million bpd in Iran’s crude production from 1978 to 1981. Reuters calculates that as a loss of about 4.27 billion barrels over three years, while noting the Energy Department’s view that much of the loss was compensated by Iran’s Gulf neighbours.

Strait of Hormuz: the chokepoint that amplifies the shock

The Strait of Hormuz typically carries around 20 million bpd of crude and refined products, described as over 30% of the world’s seaborne oil trade, and roughly one-fifth of global LNG flows. Nearly 90% of these volumes are destined for Asia, and the text notes that around 50% to 55% of India’s crude imports were transiting through the strait before the closure. The disruption therefore transmits quickly into freight, insurance, delivery schedules, and replacement sourcing costs. The article also frames the broader effect as a “geometry of delay”, where shipping disruptions ripple through ports, warehouses, and factories.

India’s macro risk: officials invoke the Covid-19 comparison

Indian officials cited in the text said the Iran war could be as disruptive to the economy as the Covid-19 pandemic in 2020, with damage that could linger for years. One measure under discussion is a credit guarantee scheme worth 2 to 2.5 trillion rupees for small and medium firms and affected sectors, according to officials involved in managing the fallout. The Finance Ministry has mapped multiple scenarios, including one assuming crude oil averages US$120 a barrel for the full year. The government is sticking to a growth forecast of 6.8% to 7.2% for the fiscal year through March 2027, while some economists have downgraded expectations, including Goldman Sachs at 5.9% for 2026 and Oxford Economics at 6.2%.

Policy response so far: taxes, stabilisation fund, fuel management

The text says the government has slashed taxes on diesel and gasoline to help keep prices stable at the pump and is providing a relief package to exporters catering to the Middle East region. It has also set aside an economic stabilisation fund of US$1.2 billion to help absorb global shocks. Officials also flagged that budgetary projections could change, with clearer impact expected in the second half of the year once more data is available. Foreign investor positioning is also mentioned, with overseas funds pulling nearly US$19 billion from local markets in the first few months of the year, close to the full-year record for 2025.

Fertilisers and chemicals: ammonia and gas-based inputs under stress

A key near-term fault line is natural gas availability and its impact on ammonia and nitrogenous fertilisers such as urea, ammonium nitrate, and ammonium sulphate. The text notes India imports nearly 2.5 million tonnes of ammonia annually, largely from Saudi Arabia, Bahrain, Indonesia, and Oman, accounting for around 90% of total imports. It also notes that gas allocation was diverted to homes and vehicles, tightening feedstock supply for ammonia production, methanol synthesis, and other gas-based chemicals. The narrative highlights that petrochemical firms typically carry one to two months of inventory, and that prolonged disruption could deepen the impact.

Household impact: LPG, rationing, and emergency powers

The most visible stress point described is cooking fuel, with the government prioritising LPG production at refineries and invoking emergency powers to prevent shortages. The text says refiners were directed to maximise LPG output from propane and butane, resulting in a 40% rise in output. It also describes steps to encourage households to shift to PNG, the use of alternative fuels such as kerosene and coal, and enforcement action against black marketing. Gas supplies to industrial and commercial consumers connected to the grid, which were earlier capped, were later restored to 80% of their average consumption, alongside efforts to stabilise supplies of key raw materials such as sulphur and LNG.

Key numbers at a glance

India’s energy exposure and buffers cited in the text

Market impact: what the facts imply for Indian equities

The text links the shock to higher oil bills, gas shortages, pressure on household purchasing power, the rupee, fiscal space, and private investment. It also notes inflation edged up in March amid concerns of below-normal monsoon rainfall, adding another layer of sensitivity for policy. For listed companies, the channels described are most direct for oil marketing companies facing crude price volatility, and for gas-intensive sectors such as chemicals and fertilisers that rely on imported LNG and ammonia. Exporters linked to the Middle East region are described as receiving relief measures, indicating policymakers are actively watching trade disruption risks. With overseas funds pulling nearly US$19 billion from local markets in the first few months of the year, the article frames the combination of a rising energy import bill and fiscal concerns as a factor that can influence foreign investor sentiment.

Conclusion

Reuters, citing IEA and U.S. Department of Energy data, frames the Iran conflict and Strait of Hormuz closure as the largest oil supply disruption on record by daily output lost, while noting earlier episodes may have had heavier cumulative losses. For India, the text points to a broad-based vulnerability spanning fuel availability, fertiliser and chemical feedstocks, inflation, and fiscal trade-offs. The next key signposts flagged are evolving government budget projections, the assessed impact in the second half of the year, and whether crude averages near the US$120 a barrel scenario mapped by the Finance Ministry.