How the US-Iran War Is Repricing Oil for Years, Not Quarters

When the Asia Pacific Petroleum Conference (APPEC) opened in Singapore this month, the energy industry delivered a verdict that few wanted to hear: the U.S. and Iran conflict is not ending soon, and the oil market has to live with it.

Brent and WTI crude have settled above the $100 mark, with Brent trading around $104.61 and WTI at roughly $100.05 as of 11 September 2026, while the Strait of Hormuz sits at a near-standstill.

This analysis lays out a framework for understanding how the US Iran war is reshaping oil prices, why a multi-year stalemate rewrites the global energy supply chain, and where the major institutions expect crude to travel through 2027. After this, you will know how to stress-test your energy exposure against both an extreme spike and a demand-destruction fade.

Why energy insiders are pricing in a prolonged stalemate

Early in the conflict, the assumption was that this would be brief. Following the first U.S. and Israeli strikes, most assessments gave the confrontation a week, maybe a month. Subduing Iran, as it turned out, proved far harder than anyone modelled.

By the time APPEC delegates gathered in September, that optimism had gone. The mood was grim, and the consensus was blunt: this does not end without a change of government in either Washington or Tehran, and the latter is viewed as highly improbable.

One APPEC delegate summed up the industry’s position, arguing that a genuine settlement would require either a change of administration in Washington or a governmental shift in Tehran. Neither is on the near-term horizon.

The diplomatic record backs the pessimism. Pakistan brokered a two-week ceasefire in April 2026 on the condition that Iran reopen the strait, but the resulting Islamabad talks on 11-12 April 2026 collapsed without agreement. Negotiators could not resolve the two core obstacles: the waterway and Iran’s nuclear programme.

A June interim deal, which included reopening the strait and ending fighting in Lebanon, unravelled as both sides traded strikes over alleged violations. Direct talks opened in Switzerland on 20 June 2026 only after Iran had closed the strait again. By August, Iran was insisting on negotiating through Oman as a mediator rather than dealing with the U.S. directly, and outstanding questions over who polices the waterway and how Iran’s economic interests are recognised remained unresolved.

The read for your energy positions is straightforward. The institutional smart money has stopped pricing a 2026 resolution, and the prevailing expectation is that the standoff persists until the end of President Trump’s current term. That means treating the current disruption as a structural supply baseline, not a temporary geopolitical shock that fades in a quarter.

The unprecedented mechanics of a closed waterway

For fifty years, the working assumption across oil markets was that Iran might threaten to close the Strait of Hormuz but would never actually do it. The risk was considered too great, even for Tehran. That assumption is now dead.

The Strait of Hormuz is the narrow chokepoint through which roughly 20 million barrels per day of crude, oil products and liquefied natural gas normally flow. When it functions, it is invisible. When it stops, global supply chains physically break, because there is no seaborne alternative with anything close to the same capacity.

Right now it has effectively stopped. Vessel traffic has fallen by around 95%, from a pre-war norm of more than 100 vessels per day to an average of just 5 to 12. On 9 September 2026, Reuters reported only six commodity vessels made the transit. The Brookings Institution and Al Jazeera both describe the strait as “effectively closed,” with the few ships that pass largely limited to those paying a toll to Iran’s Islamic Revolutionary Guard Corps.

The International Energy Agency (IEA) has called this the largest supply disruption in the history of the global oil market, slashing flows from roughly 20 million barrels per day to a trickle. The scale of the emergency response tells its own story: on 21 March 2026, IEA member countries agreed to release 400 million barrels of emergency oil stocks, the largest coordinated release the agency has ever organised.

Why historical comparisons are failing markets

The obvious reference point is the 1980s Tanker War during the Iran-Iraq conflict. It does not hold up, and understanding why matters for how you price the current floor.

Consider the contrast directly:

• 1980s Tanker War: Despite 44 attacks over nine months and heavy use of mines, the strait never fully closed. At its peak, less than 2% of ships passing through the Persian Gulf were disrupted. Analyses from the Strauss Center and the U.S. Congressional Research Service note the real oil price actually declined over the period, ending roughly 14% lower thanks to abundant global supply.
• 2026 closure: Traffic down 95%, roughly 20 million barrels per day removed from the market, and no meaningful adaptation. The IEA classes it as unprecedented.

The difference comes down to military capability and volume. Iran’s drone and ballistic missile reach makes normal shipping operations impossible without heavily monitored security guarantees that do not yet exist. And the sheer quantity of lost barrels exceeds what the market can substitute or reroute. Gulf states have overland pipelines that bypass Hormuz, but they cannot come close to replacing seaborne transit.

For you, the takeaway is that this is an absolute blockage, not a theoretical risk premium. That is why the price floor is stickier than in previous Middle East conflicts, and why the standard supply-shock models keep underestimating how long elevated prices persist.

Downstream destruction and cascading macro risks

The crude blockage is the headline. The damage compounding beneath it is arguably the more important story for your portfolio, because it will squeeze markets even if crude somehow starts flowing again.

Start with the water itself. War-risk insurance premiums for traversing Hormuz have surged to 7.5% to 10% of a ship’s hull value, up from a fraction of a percent before the crisis. For a large tanker, that translates to an insurance bill of $3 million to $21 million for a single voyage. Insurers have in many cases refused cover altogether, stranding cargoes and forcing costly reroutes.

Then come the refineries. The IEA projects global refinery throughputs will contract by 2 to 2.5 million barrels per day across the full year of 2026. The Asia Global Institute estimates most Asian economies are cutting refined output by around 30%, with China cutting 50% to 70%.

That refining squeeze lands hardest on specific fuels:

• Gasoil and diesel
• Gasoline
• Jet fuel

Asia sits directly in the blast radius, receiving 80% to 90% of everything that transits Hormuz. The UN’s ESCAP has called this Asia’s most severe energy supply shock in decades, and institutions including Allianz Global Investors and Deutsche Bank warn of intense stagflation, widening trade deficits and currency pressure across the Philippines, India, Singapore, Thailand, Taiwan and South Korea.

The macro modelling puts numbers on the pain. Brookings cites analysis showing that oil averaging $96 per barrel cuts regional GDP by 0.7 percentage points and lifts inflation to 5.2%. Push the scenario to $200 and growth falls by 1.2 percentage points while inflation climbs to 7.4%.

What this tells you is that the vulnerability extends well beyond primary oil producers. Airlines, logistics operators and Asian equities carry exposure that the crude price alone does not capture, and downstream product bottlenecks will keep pressuring corporate earnings long after the initial shock.

Institutional outlooks divide on crude trajectories through 2027

Ask the major houses where crude goes from here and you get two irreconcilable answers. One camp sees prices grinding higher toward recession-forcing levels. The other sees the market eventually adapting and prices fading. Neither is fringe, and the gap between them defines the risk you have to plan around.

The bull case for sustained elevation

The elevation camp builds its numbers on infrastructure that cannot easily be repaired. The Reuters poll of analysts projected Brent trading anywhere from $100 to $190 under sustained disruption, averaging $134.62, with a jump to $200 if Iran’s Kharg Island export terminals are destroyed.

Rystad Energy’s stalemate scenario keeps prices above $140 and assumes that level is high enough to tip the global economy into recession. The logic is that permanently damaged export capacity, not just interrupted shipping, keeps supply structurally short regardless of any ceasefire.

The bear case for demand destruction

The downside camp argues that high prices eventually solve high prices. Goldman Sachs, while acknowledging spike risk, holds a base case of Brent falling to roughly $85 by year-end, with a best case dropping into the $60 range in 2027 as buyers substitute and reroute.

The EIA’s baseline sees a similar fade, with prices potentially easing toward $74 in 2027. The mechanism is blunt: stagflation and elevated inflation erode demand, and weaker demand pulls commodity prices back down even with supply constrained.

Seeing Goldman Sachs and Rystad Energy this far apart is the real lesson. It lets you stress-test your energy exposure against both a $140-plus spike and an $85 demand-destruction fade rather than betting on a single number.

Navigating a structurally altered energy market

The through-line across every section is that this is no longer a temporary risk premium bolted onto a normal market. It is a fundamental rewiring of how crude and refined products move, and the APPEC consensus says that rewiring holds for years, not quarters.

For commodity portfolios, the immediate read is twofold. Primary producers benefit from the price floor, but the downstream refining and insurance data flags real vulnerability in airlines, logistics and Asian equities that a crude-only view misses.

To work out which institutional forecast is winning, watch three indicators in the months ahead: whether war-risk insurance premiums begin easing from their 7.5% to 10% range, whether alternative routing and pipeline capacity expands, and whether any credible mediation channel through Oman produces a durable reopening mechanism. Those signals, not the headlines, will tell you whether the $140 stalemate or the $85 fade is arriving.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions. Past performance does not guarantee future results, and the price forecasts discussed here are speculative, subject to change based on market and geopolitical developments.