Middle East conflict disrupts global oil supply; US diesel prices rebound and surge sharply

Geopolitical Conflict Triggers Supply Crisis; California Diesel Returns to $7 High

The core trigger to the current surge in U.S. diesel prices is the turmoil in the Middle East. Affected by the conflict, many refineries in the Middle East have suspended operations, tightening the global refined oil supply chain and immediately pushing up U.S. diesel selling prices.

Data shows that California diesel prices have once again broken the $7 per gallon mark after greater than a month. Currently, the diesel purchase price to truck drivers in California has risen by 30 cents compared to a month ago and has soared by 37% compared to the same period last year. The price per gallon has increased by $1.89 year-on-year, a staggering gain.

Reviewing price trends within the year, in April, affected by shipping blockages in the Strait of Hormuz, California diesel once hit a historical peak of $7.75 per gallon; in June, after the U.S. and Iran reached a consensus and shipping lanes resumed, oil prices fell back below $6.5 in July. Now, it has rebounded to hit new highs again, showing severe evaporative environment in the refined oil market.

Peak Demand Season Overlaps with Supply Gap; National Diesel Prices Rise in Tandem

Not just in California, diesel prices across the U.S. are simultaneously seeing a broad rally. Data shows that the national average diesel price has reached $5.50 per gallon, rising 40 cents in the past month and $1.81 higher than the same period in 2025.

The U.S. is currently in a critical window period, with the agricultural autumn harvest about to start and the national holiday shopping season gradually warming up. Demand to oil to road freight and agricultural operations continues to climb. The supply contraction + demand increase squeeze from both sides has further amplified the room to diesel price rises.

Diesel Price Hike Transmits Downstream, Triggering New Round of Inflation Concerns Nationwide

sector experts indicate that diesel is the core energy supporting the operation of global sector, logistics, and agriculture, and a price surge will immediately transmit to end-consumption, bringing significant inflationary pressure.

Bob McNally, President of Rapidan Energy, stated that diesel is the core fuel of the global economy, running through all scenarios including cargo transportation, manufacturing production, agricultural farming, and residential heating, making it a key indicator affecting the macroeconomy.

Kevin Book, an executive at ClearView Energy Partners, bluntly stated that rising diesel prices will not stop at the energy sector however will eventually be fully passed on to consumption areas such as food and daily necessities, making it one of the most severe inflation risks at present.

Refining Profits Soar Abnormally; Processing Returns Far surpass Crude Costs

Amidst this round of diesel price increases, U.S. refining companies are welcoming a moment of huge profits. Market data shows that the current crack spread to processing crude oil into diesel has soared to $100 per barrel, far exceeding the spot price of U.S. crude oil at about $85 per barrel. The profitability of the refining sector has hit an abnormally high level.

Severe supply-demand mismatch and soaring premiums to refined items have allowed refiners to earn excess processing profits against a backdrop of stable raw material costs, making them the biggest beneficiaries of this round of energy price hikes.

Multiple Factors Contribute; California Oil Prices Long Higher Than National Average

California diesel prices continue to lead the nation and remain high due to core regional reasons. Andy Lipow, President of Lipow Oil Associates, analyzed that California's refined oil is highly dependent on imports, and import procurement costs are significantly higher than domestic refining.

At the same time, California implements stringent environmental standards, mandating the consumption of exclusive special-blend diesel, resulting in higher production and blending costs. Coupled with high state consumption taxes and sales taxes that add up layer by layer, these factors jointly push up regional fuel terminal selling prices.

Global Supply Gap Persists; Oil Prices Unlikely to Fall in Short Term

sector institutions predict that the supply disruption caused by geopolitical conflicts is prolonged, and diesel prices are unlikely to retreat in the short term.

Currently, global daily diesel demand is about 28 million barrels. Geopolitical warfare has immediately affected 8% of global diesel supply, and a hard supply-demand gap continues to exist. Meanwhile, affected by sanctions, damaged refining facilities in Russia find it difficult to obtain repair equipment and materials, significantly prolonging the production suspension and repair cycle. The tight pattern of global refined oil supply will continue.

Institutions predict that global diesel prices will maintain a high evaporative environment direction until the damaged refining capacity in the Middle East and Russia is fully restored and regional export capabilities recover.