The Strait of Hormuz Under Threat: What an Iran Conflict Means for Global Energy

The Numbers Behind the Choke Point

The Strait of Hormuz is not merely a geographic feature. It is the single most consequential maritime passage in the global energy system. Understanding what an Iran conflict means for global energy markets requires starting with what the strait actually carries and what happens if that flow is disrupted.

According to the most recent data from the US Energy Information Administration and the International Energy Agency, approximately 21 million barrels per day of petroleum liquids transited the Strait of Hormuz in 2024. This represents approximately 21 percent of total global petroleum consumption. In liquefied natural gas, the figure is even more concentrated: approximately 20 percent of global LNG trade passes through the strait, largely from Qatari terminals that have no alternative export route.

The geography is unforgiving. At its narrowest point, near the Musandam Peninsula of Oman, the usable navigational channel is approximately two miles wide in each direction, separated by a two-mile buffer zone. The shallow water and confined navigation requirements mean that disruption does not require closing the strait entirely. Mining, harassment operations, attacks on tankers, or damage to loading terminals can reduce throughput severely even if the strait itself remains technically open.

Who Is Exposed and How Much

The exposure to Hormuz disruption is not evenly distributed. Some economies have strategic petroleum reserves, diversified import sources, and alternative supply chains that provide meaningful buffer. Others are structurally dependent on Hormuz flows with limited alternatives.

Japan is the most comprehensively exposed of the major economies. Approximately 90 percent of Japanese oil imports transit the Strait of Hormuz, primarily from Saudi Arabia, the UAE, Kuwait, and Iraq. Japan has approximately 150 days of strategic reserves, including both government and industry holdings, but the absence of domestic production and the lack of alternative supply routes at the required scale means that a prolonged disruption would produce economic consequences that Japan's strategic reserve cannot fully offset.

South Korea faces a similar structural exposure. Approximately 70 percent of Korean oil imports transit Hormuz, with the Korean peninsula's geographic position making diversification to non-Middle East sources expensive and logistically complex. South Korea's petrochemical and semiconductor industries are particularly energy-intensive, meaning that supply disruption translates rapidly into manufacturing disruption.

China's exposure is substantial but partially offset by its geographic diversity of supply. Chinese imports from Middle Eastern sources account for approximately 40 to 45 percent of total crude imports, with the remainder coming from Russia, Central Asia, and West Africa. China also holds strategic reserves, though the precise scale of those reserves is not publicly disclosed. A partial Hormuz disruption would be manageable for China through supply diversion. A full and sustained closure would stress Chinese energy infrastructure significantly.

India is in a structurally complex position. Middle Eastern oil accounts for approximately 60 percent of Indian imports, and India has been actively diversifying toward Russian crude since 2022 following Western sanctions on Russian exports. This diversification provides some buffer, but the scale of Indian energy demand means that full Hormuz substitution would be impossible in the short term.

European exposure is the most heterogeneous. Northern European economies have largely diversified away from Middle Eastern oil imports, relying more heavily on North Sea, West African, and North American sources. Southern European economies, particularly Italy and Spain, retain higher Middle Eastern dependency. European LNG import infrastructure, which expanded significantly following the 2022 Russian gas cutoff, relies partly on Qatari supply that transits Hormuz.

Price Scenarios

Energy market analysts have developed multiple scenarios for oil price behaviour under different disruption conditions. The scenarios vary significantly based on the assumed duration and severity of disruption, the pace of strategic reserve deployment, and the response of non-MENA producers.

In a partial disruption scenario, in which Hormuz throughput is reduced by 20 to 30 percent through harassment, mining, or tanker attacks rather than full closure, most analysts project Brent crude prices in the range of $100 to $120 per barrel, up from the $75 to $85 range that prevailed through much of 2025. This price level is painful but manageable for most OECD economies, historically consistent with previous supply disruptions, and likely to trigger strategic reserve releases that moderate the spike within six to eight weeks.

In a full closure scenario, in which Hormuz is effectively shut for two weeks or more, price projections diverge significantly. Conservative estimates place Brent in the $130 to $150 range. More aggressive modelling, accounting for speculative pressure and supply chain disruption beyond the immediate oil market, places the price at $160 to $180 per barrel. At these levels, global recessionary effects become significant within three to four months. Historical analogies are limited because no full Hormuz closure has ever occurred, but the 1973 Arab oil embargo and the 1979 Iranian revolution provide partial reference points for the economic consequences of sustained supply disruption.

The Strategic Reserve Question

The International Energy Agency coordinates a collective strategic petroleum reserve system among member countries that, in aggregate, represents approximately 1.5 billion barrels of accessible reserves. This represents approximately 90 days of net imports for IEA member countries under normal conditions.

The IEA has released strategic reserves on three occasions in its history: 1991 during the Gulf War, 2005 following Hurricane Katrina's damage to US Gulf Coast infrastructure, and 2022 in response to the Russian invasion of Ukraine. Each release had different market effects depending on the scale, the duration of the supply disruption, and the credibility of the signal that reserves would continue to be available.

For a Hormuz disruption, the strategic reserve system provides a buffer but not a solution. The reserves are finite and the release mechanism is designed for temporary disruption rather than sustained closure. A disruption of more than two to three months would exhaust strategic reserve capacity for some member countries, particularly those with the highest Hormuz dependency, before alternative supply arrangements could be fully operationalised.

Alternative Routes: What Exists and What Does Not

The most frequently cited alternative to Strait of Hormuz transit for Middle Eastern oil is the overland pipeline infrastructure that bypasses the strait entirely. The most significant of these is the East-West Pipeline in Saudi Arabia, which carries crude from the Eastern Province to the Red Sea terminal at Yanbu. This pipeline has a capacity of approximately 5 million barrels per day, representing less than a quarter of current Hormuz throughput.

The UAE's Abu Dhabi Crude Oil Pipeline to Fujairah on the Gulf of Oman, bypassing Hormuz, has a capacity of approximately 1.5 million barrels per day. Iraqi exports through Turkey via the Kirkuk-Ceyhan pipeline add another 0.5 to 0.8 million barrels per day in bypass capacity, though this pipeline has faced frequent disruption from its own infrastructure challenges.

In aggregate, pipeline bypass capacity for Middle Eastern oil is approximately 7 to 7.5 million barrels per day, compared to the 17 to 18 million barrels per day of crude oil that currently moves through Hormuz. There is no bypass infrastructure for Qatari LNG at meaningful scale. The gap between current throughput and bypass capacity is not closable in any timeframe relevant to a crisis scenario.

The Market Signal Problem

Beyond the physical supply disruption, a conflict involving Iran creates a market signal problem that amplifies economic effects beyond what the actual physical disruption would justify. Energy markets are forward-looking. Traders and risk managers who anticipate disruption will bid up prices in advance of actual supply reduction, creating a price spike that precedes and exceeds the immediate physical impact.

This dynamic was visible in 2019 when attacks on Saudi Aramco facilities produced a temporary price spike of nearly 15 percent within a single trading session, even though supply was restored within weeks and no sustained disruption materialised. A conflict scenario involving direct US-Israeli military action against Iran, with the prospect of sustained regional war rather than a single incident, would produce market signal effects of a substantially larger magnitude.

The economic consequences of an Iran conflict are therefore not simply a function of how many barrels are disrupted and for how long. They are also a function of how long uncertainty persists, how credible alternative supply assurances are, and how effectively consuming governments can signal to markets that the strategic reserve system will prevent the disruption from becoming a permanent supply reduction.