As of 9 April 2026 the Strait of Hormuz is still not back to normal. A ceasefire has reduced the immediate fear of a wider war but shipping remains restricted and uncertain. Reuters reported that about 20% of global oil and LNG flows normally pass through the strait. It also reported that around 187 tankers carrying roughly 172 million barrels of crude and refined products were still inside the Gulf as shippers waited for clearer rules and safer passage.
That matters for oil prices of course. But price is only the first layer. The deeper problem is that refiners do not just need barrels. They need the right barrels at the right time. Reuters reported this week that physical crude prices moved close to $150 a barrel at the peak of the disruption and that the scramble was especially sharp for prompt cargoes that could actually be run in existing refinery systems. That is a very different kind of shock. It is less about the headline Brent number and more about who can still secure usable feedstock.
This is where many outside the industry miss the point. Crude oil is not one simple raw material. The U.S. Energy Information Administration notes that crude oils differ mainly by density and sulphur content and that those characteristics shape how a refinery processes them. Lighter crudes can yield high-value products with simpler distillation. Heavier and sourer crudes need more complex and more costly processing. EIA also notes that refineries do not work on crude alone. They often use condensates natural gas liquids naphthas light gas oils heavy gas oils and residuum as part of the wider feedstock picture.
So when Hormuz tightens the real issue is not only missing supply from the Gulf. It is the forced change in crude slate. Refiners suddenly have to look harder at cargoes from the Americas Africa and Europe. Reuters has reported record premiums for U.S. WTI cargoes as buyers competed for replacement supply. It also reported that freight rates surged sharply and that sellers of West African crude started holding barrels back in expectation of higher bids. In other words alternative supply may exist on paper but it arrives late and expensive and often with a different quality profile from the crude a refinery had planned to run.
That is why refinery flexibility now matters more than refinery size. A plant built around a familiar medium sour diet cannot switch overnight to a very different slate without consequences. The change touches yields energy use sulphur handling hydrogen demand blending strategy and unit reliability. A refinery may still be able to run. That is not the same as running well. Margins can erode quickly if the plant is forced into a crude mix that does not suit its configuration or if the team is slow to adjust operating conditions. The physical differences between crude grades are exactly why those adjustments become necessary in the first place.
See also: 5 Easy Tips to Grow Your Business Network
That has a direct implication for refinery strategy. Opportunity crudes used to be discussed mainly as a margin play: buy a discounted barrel, manage the processing headaches, capture the spread. After Hormuz, the more important question is resilience. Can a refinery move quickly from a familiar medium-sour slate to a more complex mix of Atlantic Basin crudes, condensates, unfinished oils and opportunistic cargos without waiting weeks for a full replan? Can it re-optimise cut points, hydrogen balance, desalter performance, sulfur loading, utilities demand and crude blending fast enough to stay commercially competitive? The refineries that answer yes will be the ones that keep margins alive when geopolitics rewrites the crude slate overnight.
This is also where AI-enabled optimisation starts to matter in a serious way. Not as a marketing layer and not as a dashboard that tells management what they already know, but as an operating capability tied to real process data. Deloitte’s 2026 oil and gas outlook says around half of AI and generative AI spending by US oil and gas companies now targets process optimisation. In refining terms, that means faster evaluation of incoming crude quality, quicker scenario testing across unit constraints, better prediction of yield and energy impacts, and more responsive decisions on how to blend, reroute and run. The commercial value of AI in a refinery is highest when the crude slate becomes unstable. In quiet markets, it can improve margins. In disrupted markets, it can preserve operability.
The geopolitical lesson is obvious enough: the Strait of Hormuz remains a strategic vulnerability, and even a partial reopening may leave the market with structurally higher freight, insurance and political risk. Reuters reported today that proposed transit tolls and selective passage rules could hardwire a more volatile energy market even if a full closure ends. But the industrial lesson is more interesting. The refining winners in the next phase of this crisis will not necessarily be those with the best long-term crude contracts. They will be the ones with the fastest ability to change feedstocks, re-optimise operations and protect product output when the crude that arrives is no longer the crude they planned for.
