Exxon Joliet refinery remains shut after flooding

Exxon said floodwater covered a pump at the site, where a containment dam was deployed as part of cleanup efforts. The company also said the root cause of the outage was traced to primary and secondary power lines from utility ComEd feeding the refinery, and that electricity had been fully restored.

Exxon took the refinery offline on Sunday after a power failure triggered the facility’s safety flare. The company declined to say whether the pump issue was linked to that outage. IIR Energy had expected normal service to resume by the end of this week, but Wood Mackenzie said the refinery was still down as of Thursday. GasBuddy analyst Patrick De Haan said on X that flaring resumed on Wednesday.

The outage lands at a sensitive moment for fuel markets. Global supply is already under pressure from conflict in the Middle East and Ukrainian attacks on Russian refineries, while U.S. diesel prices have moved above $6 a gallon nationally and continued rising this week. That backdrop raises the stakes for any extended disruption at a Midwest refinery with direct importance to the region’s gasoline and diesel balance.

Exxon shares were little changed in recent trading, while rivals Marathon Petroleum and Valero have seen stronger moves as investors track refining margins and supply disruptions. Technical readings on Exxon’s stock still show it trading above its 50-day and 200-day moving averages, suggesting the market has not yet priced in a major knock-on effect from the outage.

Investors will watch for signs of when Joliet restarts fully and whether repairs are limited to the pump and power systems or point to broader operational damage. Any longer-than-expected shutdown would likely support regional fuel prices and refining margins, while a quick return would ease pressure on Midwest supply.