The global diesel market is facing a tightening supply crisis that could persist for months, even if hostilities in the Middle East ease, as refinery disruptions, declining inventories and rising seasonal demand constrain the availability of refined fuels.
Brent crude and West Texas Intermediate have remained below $100 per barrel, despite trading roughly $20 above their pre-war levels. The relatively moderate increase in crude prices, however, contrasts sharply with the rise in refined-product prices, highlighting growing pressure on the global refining system.
European diesel prices have risen by about 70% from pre-war levels, according to data cited by Reuters. Diesel has also recently become more expensive than jet fuel in Europe, marking the first time in more than a year that diesel has traded at a premium to jet fuel, based on LSEG data.
The pressure is also evident in the United States, where the diesel crack spread climbed above $100 per barrel earlier in the week. The premium over crude reached about $102 per barrel on Monday before easing to approximately $100 on Tuesday.
The widening spread between crude and diesel prices reflects a market where refining capacity, rather than crude supply alone, has become a major constraint.
The International Energy Agency estimates that about one-fifth of Middle Eastern refining capacity has been disrupted by hostilities. The affected capacity amounts to approximately 9.6 million barrels per day, further reducing the region's ability to supply refined products to international markets.
The disruption has been compounded by Ukrainian drone attacks on Russian refineries. Russia is one of the world's largest diesel exporters, but attacks on its refining infrastructure have contributed to domestic fuel shortages and prompted restrictions on exports as authorities seek to protect domestic supplies.
The combined impact of disruptions in the Middle East and Russia has tightened the international diesel market, while available refining capacity elsewhere has been insufficient to fully compensate for the lost production.
Global refinery runs in the second quarter were about 5.1 million barrels per day below last year's level, according to IEA data cited by Reuters. Fuel demand also declined by around 4 million barrels per day, leaving a gap of more than 1 million barrels per day.
The reduction in demand, however, has largely been driven by higher prices rather than voluntary changes in consumption. Businesses and consumers using less fuel because of rising costs may reduce demand, but that does not eliminate the inflationary pressure generated by expensive energy.
The United States has consequently increased fuel exports as other major supply sources face disruptions. U.S. fuel exports reached an all-time weekly average of about 1.9 million barrels per day.
Higher refinery utilisation has supported those exports, but inventory withdrawals have also been used to meet international demand. That is creating another potential weakness in the market.
Bank of America analysts warned that increased U.S. fuel exports are drawing down already-tight domestic inventories, turning the United States into a major source of competition for diesel supplies globally and pushing diesel crack spreads towards record seasonal levels.
The situation is particularly significant for diesel because global stocks of the fuel were already considered tight before the Middle East conflict began, according to Goldman Sachs analysts cited in the report.
As inventories decline, the ability of the United States to continue supplying large volumes to overseas markets could become increasingly constrained if domestic stocks fall too far.
The approaching winter could add another layer of pressure. Diesel is heavily used in road transportation, freight, agriculture and industrial activity, while middle-distillate fuels are also important for heating. Demand therefore typically increases as temperatures fall across the northern hemisphere.
Europe is particularly exposed to the tightening market. Eugene Lindell, head of refined products at FGE NexantECA, warned that the region faces a serious diesel supply problem and could experience exceptionally high prices.
The potential impact is not limited to Europe. Diesel is a major fuel for transportation and economic activity worldwide, meaning sustained shortages can increase freight and logistics costs and eventually affect manufacturing, agriculture, food distribution and other sectors.
The pressure is already feeding into broader inflation concerns. U.S. consumer prices rose 3.4%, while eurozone inflation stood at 2.9%, with higher energy costs contributing to the increases.
A prolonged diesel shortage could therefore extend the impact of the current energy crisis beyond the fuel market, particularly if transportation and industrial costs continue to rise.
The market's vulnerability also means that an improvement in the geopolitical situation may not immediately restore normal diesel prices. Even if Middle Eastern tensions ease, damaged refineries would still need to return to operation, inventories would need to be rebuilt and global supply chains would have to adjust.
The result is a fuel crisis that could outlast the geopolitical events that triggered it. With refining capacity impaired, inventories under pressure and winter demand approaching, the key question for the global market is increasingly not simply how much crude oil costs, but whether enough refining capacity remains available to turn crude into the diesel required by consumers and businesses.