War-Driven Refining Boom Lifts Big Oil Earnings, but the Upside Is Fragile

How the Iran Conflict Turned Refining Into Big Oil's Profit Engine

The Iran conflict has turned oil refining from the oil industry's least-loved business into its most profitable one, at least for now. Refining margins for gasoline, diesel and jet fuel have hit record highs after months of disruption around the Strait of Hormuz, attacks on Middle Eastern refineries and Ukrainian drone strikes on Russian energy infrastructure. That has given integrated majors like BP, Chevron, Exxon Mobil, Shell and TotalEnergies a wave of extra earnings, according to analysis from Reuters.

The supply shock is severe. The loss of Middle Eastern crude and China's decision to cut runs and halt fuel exports removed roughly 5 million barrels per day, or about 6%, of pre-war global refining output in the second quarter. Global refinery runs fell to around 78 million barrels per day, the lowest since 2020, according to the International Energy Agency. U.S. refineries, now the world's largest fuel suppliers, ran at 97% of capacity in the week to July 24, well above their long-term average of about 90%.

The profits are visible across the sector. BP's refining indicator margin climbed from $17 per barrel in the first quarter to $30 in the second, and has averaged $42 in the third quarter. Exxon's downstream earnings reached $5.5 billion, Chevron's $4.9 billion and Shell's products division reported $2.5 billion, all among their strongest results in years. But the root cause is war and scarcity, not a healthier industry.

The key question is how long the windfall lasts. A reopening of the Strait of Hormuz and a recovery in Chinese refining would loosen fuel markets meaningfully, but repairing damaged refineries in the Middle East and Russia will take months or years. In the meantime, governments are refilling depleted fuel inventories and expanding strategic storage, creating a demand cushion that could keep margins elevated for some time.

Inside the Boom: Scarcity, Record Margins and the Fragile Upside

Why the War Premium Is So Large

The size of the margin spike reflects how little spare capacity exists. Western majors spent two decades retreating from refining because of volatile margins, high costs, carbon pressure and competition from state-backed refiners. Combined refining volumes for BP, Chevron, Exxon, Shell and TotalEnergies fell from 16.4 million barrels per day in 2005, or 22% of global capacity, to 10.4 million barrels per day last year, roughly 13%. Shell alone cut its refinery interests from 40 to seven. When war removed Middle Eastern and Russian supply, there was almost no slack left in the system, so product prices had to spike to ration demand.

Record Profits Built on Scarcity

This is a windfall generated by damaged infrastructure, not by structural improvement. TotalEnergies CEO Patrick Pouyanne called the company's refining performance exceptional, but the exception is the war, not the business. U.S. refineries were the big near-term winner because they kept running hard, at 97% utilisation, while Asian rivals cut runs after losing crude imports. Russia, by contrast, lost export capacity and was forced to ban diesel exports, pushing global prices higher.

The Demand Side Has Legs, for a While

Energy-security concerns are creating a second wave of demand. Global oil stocks fell by 5.1 million barrels per day in the second quarter and were forecast by the U.S. Energy Information Administration to fall another 2.2 million barrels per day in the third. Refilling diesel, jet fuel and gasoline inventories, plus new strategic storage programs, could take years. Wood Mackenzie's Alan Gelder expects strong refining margins and utilisation through the end of the decade because oil demand is still growing and few new refineries are under construction. That is the strongest argument for the boom lasting longer than an immediate ceasefire scenario.

The Structural Decline Has Not Gone Away

The boom may delay, not reverse, refining's long-term retreat. Countries with limited domestic refining capacity, such as Australia, are already reconsidering local projects. Any new wave of capacity could eventually create oversupply, and the majors know it: a few exceptional years do not change the arithmetic of electric vehicle adoption and a fuel-demand plateau later this decade. Today's high margins are a reason to harvest cash, not to rebuild the old Western refining footprint.

What Refiners, Investors and Governments Should Watch Next

• Treat current refining margins as a war premium: BP's indicator averaged $42 per barrel in the third quarter versus $30 in the second, but any reopening of the Strait of Hormuz or resumption of Chinese fuel exports would compress margins quickly.
• For integrated majors, the priority is harvesting cash while utilisation remains exceptional, as Shell's 102% run rate in the second quarter shows, rather than committing new capital to Western refining capacity.
• Investors should benchmark future quarters against the latest results, including Exxon's $5.5 billion downstream profit and Chevron's $4.9 billion, and watch whether third-quarter margins hold near the $42 average.
• Governments weighing new local refining capacity, as Australia is doing, should model the risk that today's scarcity-driven margins turn into oversupply once damaged plants return and new projects come online.