American diesel costs have surged to unprecedented levels, and a sudden halt at a major Midwest refinery is intensifying worries over tighter regional fuel availability. Should the outage stretch beyond initial expectations, price strain in the diesel sector could spill into the gasoline market, lifting fuel expenses across several Midwestern states.
The Exxon Mobil facility in Joliet, Illinois, which processes up to 275,000 barrels daily, was forced offline last Sunday after an electrical malfunction set off its safety flare system. According to Reuters, a Thursday filing revealed that a pump station at the site was also impacted by flooding. Exxon Mobil noted that the power failure originated from issues with primary and backup lines operated by ComEd that feed the plant. Although electricity was fully restored on Thursday, fuel production has yet to resume.
Meanwhile, pressure in the U.S. diesel market was already severe before this event. Fresh data from AAA shows the nationwide average retail price for diesel has climbed to $6.45 per gallon, marking an all-time high. Industry analysts caution that if the Joliet refinery remains idle for an extended period, fuel supplies in Illinois, Indiana, Ohio, Wisconsin, and Michigan could tighten further, with gasoline prices in some areas potentially surpassing the $5-per-gallon threshold.
Joliet Refinery Halt Puts Midwest Fuel Supplies Under Strain
Situated roughly 40 miles southwest of Chicago, the Joliet refinery produces about 11 million gallons of gasoline and diesel each day, primarily serving the Midwest market. Its crude processing capacity accounts for roughly 6% of the region's total refining capability and about 1.5% of the nation's output, giving it a crucial role in the local fuel supply network.
GasBuddy’s head of petroleum analysis, Patrick De Haan, said spot diesel prices in the Great Lakes area have already climbed to the highest level nationwide, reaching $240 per barrel. He projects that Ohio faces an elevated risk of gasoline price increases, while Wisconsin and Indiana are at moderate risk. Michigan and Illinois carry relatively lower risk, though some localized areas could still breach the $5 mark.
Diesel costs face broader upward pressure compared to gasoline in this situation. De Haan noted that most of the states mentioned are likely to see moderate-to-substantial hikes in diesel prices. With national retail diesel costs already at record highs, the speed at which the Joliet facility can restart will be a key variable shaping Midwest fuel availability and pricing trends.
Global Refining Limits Add to Strain, Diesel Gains May Spread to Gasoline
The Joliet shutdown is not an isolated occurrence. Ongoing disruptions to global refining capacity have kept fuel supplies under constant stress. Analysts at Goldman Sachs, including Yulia Zhestkova Grigsby and Daan Struyven, warned earlier this week that tightness in the worldwide diesel market could increasingly transmit into gasoline.
In a constrained supply environment, refiners may prioritize producing higher-margin diesel, which could reduce gasoline output. Mike McGlone, senior commodity strategist at Bloomberg Intelligence, remarked on Monday that diesel prices around $6 per gallon evoke memories of the 2008 gasoline shock, highlighting the current strain on fuel costs.
If refinery outages persist alongside global supply disruptions, rising fuel prices could amplify inflation expectations and put pressure on interest rates and risk assets. Additionally, ongoing security concerns in the Strait of Hormuz continue to provide underlying support for crude prices, leaving a high degree of uncertainty in the global energy market.