The closure of the Strait of Hormuz, announced on April 28, 2025, has sent immediate shock waves through global energy markets. Brent crude prices surged more than 10 percent to above $95 per barrel, while West Texas Intermediate rose to $91.
The narrow waterway, which connects the Persian Gulf to the Gulf of Oman and is bordered by Iran to the north and Oman to the south, normally handles roughly 20 million barrels of oil daily — about 20 percent of global consumption. The disruption tests a system that has long relied on the free passage of tankers through a chokepoint that has been a geopolitical flashpoint for decades.
Uneven Burden Across Major Economies
The economic impact of the strait’s closure falls unevenly across the world’s largest economies. Japan relies on the Gulf for 80 percent of its oil imports. South Korea gets 70 percent from the same source.
India imports 60 percent of its oil via the Gulf, and China depends on the region for 40 percent of its supply. By contrast, the United States is far less exposed, importing only about 10 percent of its oil from the Gulf.
This disparity means that Asian industrial powers face the most immediate pressure, as tankers that would normally pass through the strait must now consider a stark alternative: the route around the Cape of Good Hope, which adds 15 to 20 days to transit times. That detour drives up shipping costs and delays deliveries for every barrel that takes the long way around Africa. The strait has historically been the only sea route for petroleum exports from several Gulf nations, including the United Arab Emirates, Qatar, Kuwait, Bahrain, and Iraq.
Before the 2026 Iran War, it handled a quarter of seaborne oil and a fifth of liquefied natural gas shipments annually, making disruptions a direct concern for Europe and Asia as well.
Emergency Reserves and Historical Precedent
Officials at the International Energy Agency have stated the organization is ready to release emergency oil reserves if needed. That statement signals that major consuming nations are preparing for a supply crunch that could last longer than previous disruptions.
The current closure contrasts with the 2019 attacks on Saudi Aramco’s facilities at Abqaiq and Khurais, which temporarily cut 5.7 million barrels per day from global supply. Those attacks caused a 15 percent price spike but were resolved relatively quickly. Officials have noted that the current closure could have a more prolonged impact because a closure of the Strait of Hormuz has no quick fix.
Every day the strait remains closed, tankers stack up, insurance rates climb, and importing nations burn through their strategic reserves. The IEA’s readiness to intervene suggests member governments expect this to be a test of the global oil system’s resilience.
The modern oil market took shape in the late 19th and early 20th centuries as demand grew with industrialization and transportation. The Organization of the Petroleum Exporting Countries later formed to coordinate production policies among major producers, giving it influence over global prices. Before the rise of petroleum, whale oil was the dominant fuel for lighting and lubrication. Today, oil prices are set by global supply and demand, influenced by benchmark crude grades such as Brent and West Texas Intermediate.
A barrel of oil is defined as 42 U.S. gallons or 159 liters.
Strategic Pressure Point With Deep Roots
The strait’s strategic importance dates back to ancient trade routes described in classical texts, but its modern significance grew as oil became the world’s primary energy source, turning the narrow passage into a chokepoint that can sway economies far beyond the Gulf. While the strait has never been closed for an extended period during conflicts, Iran has repeatedly threatened to disrupt traffic during past crises, conducting military exercises simulating a blockade and preparing mining capabilities. The current closure, announced in April 2025, underscores how a single maritime route can ripple across energy markets, shipping networks, and national security strategies.
With most Gulf oil exports passing through the strait, even a temporary halt forces tankers to reroute around southern Africa, adding weeks to voyages and increasing costs. Major importers like Japan, South Korea, India, and China depend heavily on Gulf oil, while the United States relies far less on the region.
The closure tests the resilience of global supply chains and the readiness of emergency reserves maintained by consumer nations. For decades, the strait has been a geopolitical pressure point, and the current disruption makes its stability a shared concern for governments and industries worldwide.
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