Iranian Tanker Exports Resume at Near-Prewar Levels Amid Controlled Hormuz Reopening and Global Rerouting Strain

The market's reaction to the Hormuz crisis is a direct reflection of a physical gridlock. The strategic waterway is effectively closed, and the data shows a near-total collapse in commercial traffic. On March 15, only three outbound crossings were recorded, with no inbound transits. This near-paralysis, with activity at a fraction of normal levels, underscores the extreme risk that is keeping tankers away.

The immediate supply shock is severe. The International Energy Agency estimates that at least 10 million barrels per day of oil supply has already been curtailed, with the bulk of that-roughly 8 million barrels per day-coming from crude. This disruption is not theoretical; it is the direct result of producers being unable to move their output. The IEA notes that flows through the strait have plummeted from about 20 million barrels per day before the conflict to minimal volumes today, forcing producers to slash output as storage fills.

The global trade impact is staggering. The strait normally handles about one-fifth of global oil trade, and the closure now puts approximately 21% of the world's oil supply and 25% of global LNG trade at risk. This isn't just a regional issue. The physical flow of energy is being rerouted, with ships diverting via the Cape of Good Hope, adding up to 14 extra transit days and tripling tanker spot rates for Gulf-to-Asia routes. The strain is visible in the 150+ stranded vessels and the 14 extra transit days added to alternative routes.

In short, the physical flow has been severed. The tanker counts tell the story: near-zero crossings, massive curtailments, and a global trade network scrambling to adapt. This is the real supply shock, and it is happening now.

The Slow Reopening: What's Driving Tanker Passage?

The physical gridlock is easing, but the reopening is a selective and controlled process, not a wholesale return to normal. Early signs point to a phased resumption, driven by specific geopolitical calculations and the need for Iran to maintain its cash flow.

The most direct signal of a potential pathway is the U.S. Treasury Secretary's statement that the US Navy will be escorting oil tankers through the Strait of Hormuz. While the Energy Secretary noted the U.S. is not yet ready, this announcement implies a planned military response to secure passage. The fact that some tankers are already moving suggests this escort may be enabling limited crossings, creating a fragile corridor for trade.

Yet the most striking aspect of this reopening is its selectivity. While the strait is closed to much of the world's oil, Iran itself is shipping oil through the strait in almost the same volumes as before the war. This is a critical cash flow for Tehran, funding both its economy and its war effort. The United States appears to have made a deliberate choice not to halt these shipments, even as it has destroyed much of Iran's navy. This selective opening allows Iran to continue exporting, likely to maintain leverage and revenue, while keeping the broader global supply choke point under pressure.

Initial crossings appear to reflect this controlled environment. Reports indicate Iranian tankers, I believe some Chinese flag tankers have come through. This pattern suggests a phased reopening, where certain nationalities or cargoes are permitted to pass, possibly under the watchful eye of a U.S. escort. It is a managed flow, not a free-for-all, designed to ease the immediate supply shock for Iran while the broader geopolitical standoff continues.

The bottom line is that the physical flow is returning in a narrow band. The U.S. military is preparing to escort, Iran is prioritizing its own exports, and the first vessels through are likely those from key allies or those essential to Iran's survival. This is not a sign of a resolved crisis, but a tactical adjustment to manage the immediate consequences of a closed strait.

Implications for the Global Oil Balance

The physical flow of oil is under immense strain, and the market's focus on price moves is a symptom of that deeper pressure. The slow reopening and the scramble to reroute cargo are actively testing the global supply-demand balance, adding layers of cost and uncertainty.

Route redistribution is now the dominant reality. With the Strait of Hormuz effectively closed, ships are diverting via the Cape of Good Hope, a journey that adds up to 14 extra transit days. This has kept Cape of Good Hope diversion traffic staying elevated while also causing a rebound in Suez Canal volumes as vessels seek alternative passages. This shift is not a minor adjustment; it represents a massive reallocation of global shipping capacity, straining logistics hubs like Salalah and Karachi and increasing the risk of bottlenecks elsewhere.

The cost of this rerouting is stark. The added time and distance have driven tanker spot rates to extreme levels, with tanker spot rates tripling for Gulf-to-Asia routes. This surge in shipping costs is a direct transfer of value from consumers to the shipping sector and is a clear signal of the physical friction now embedded in the trade. It also means the economic cost of the disruption is far higher than the simple loss of the 10 million barrels per day curtailed at the strait.

The market's reaction, however, shows a disconnect between the physical reality and financial expectations. While spot prices are surging due to the immediate supply shock, futures markets are pricing in a rapid end to the situation, with steeply declining price paths. This suggests traders are betting on a swift geopolitical resolution and the return of normal flows. Yet the physical data tells a different story: near-zero crossings, 150+ stranded vessels, and a global trade network operating under a severe strain. The futures curve is looking past the current gridlock, but the physical balance is being tested by the sheer volume of oil that cannot move.

The bottom line is that the core commodity balance is being disrupted by physical constraints, not just by price signals. The market must look beyond the headline price of Brent crude to the underlying flow. The slow, selective reopening and the costly, prolonged alternative routes mean the supply shock is not a temporary blip but a sustained pressure on the global system. For now, the physical flow remains the critical variable, and its strain is being measured in days, dollars, and stranded tankers.

Catalysts and Risks for the Supply Balance

The path forward hinges on a single, uncertain variable: the conflict's timeline. Energy Secretary Chris Wright has stated he thinks the U.S. conflict in Iran will certainly come to an end in the next few weeks. This expectation is the primary catalyst for easing the supply shock. A swift resolution would allow the U.S. Navy to fully implement its escort plan, reopen the strait to normal commercial traffic, and enable the massive volumes of oil currently stranded or rerouted to flow again. The market's futures curve, which prices in a rapid end, reflects this hope. Yet, as the Secretary himself noted, this is a weeks, this is not a months thing, underscoring the high stakes of a prolonged standoff.

The major risk is that the conflict drags on, with Iran using the Strait as a bargaining chip. The physical flow already shows a dangerous precedent: Iran itself is shipping oil through the strait in almost the same volumes as before the war, while blocking others. This selective opening allows Tehran to maintain a critical cash flow for its economy and war effort. If the conflict continues, this pattern could solidify, turning the Strait into a managed choke point where Iran's exports flow while those of its neighbors remain trapped. This would sustain the 10 million barrels per day of curtailments and keep shipping costs elevated, testing the global balance for months.

For now, the core commodity balance is being tested by physical constraints, not speculation. The market's focus on price moves is a symptom of the underlying pressure. While futures suggest a quick fix, the physical reality is a gridlock with three outbound crossings and 150+ stranded vessels. The true test is the flow of oil, not the price of paper contracts. The bottom line is one of high uncertainty. A swift end to the conflict offers a clear path to normalization. But the risk of a drawn-out standoff, with Iran controlling the flow, means the supply shock could persist, turning a weeks-long disruption into a sustained test for global energy markets.