A sudden power outage knocked out ExxonMobil's massive Channahon refinery Sunday afternoon, triggering a shutdown that has plant workers scrambling through site assessments and air monitoring while fuel analysts warn the disruption could ripple into gas prices across the Chicago region.
The outage began around 3:30 p.m. Sunday and knocked out power for roughly three and a half hours before it was restored at about 7 p.m., according to CBS News Chicago. The refinery, located in unincorporated Channahon Township southwest of Chicago, is now investigating the cause of the outage, and workers were still conducting a site status assessment as of Monday. A refinery spokesperson said the safety of the community and workforce remains the primary focus, and that the plant is in touch with the appropriate agencies, per the same report.
The stakes of even a brief outage at this facility are considerable. GasBuddy petroleum analyst Patrick De Haan warned Monday that the power loss could create upward pressure on Great Lakes spot gasoline and diesel prices, a risk compounded by the fact that BP's Whiting, Indiana refinery is already partially offline for maintenance, according to a post on Bluesky. De Haan noted that some of that pressure may be cushioned by the approaching seasonal switch to cheaper winter-blend fuel.
A Refinery That Anchors the Region's Fuel Supply
The scale of what's at stake becomes clearer when you look at what the Channahon plant actually produces. ExxonMobil's own 2026 facility factsheet states the refinery processes up to 275,000 barrels of crude oil daily, accounting for 6% of total Midwest refining capacity, and churns out roughly 11 million gallons of gasoline and diesel a day, per ExxonMobil — daily output equivalent to about 550,000 car and semi-truck fill-ups.
Built in 1972 across 1,400 acres of Channahon Township, the plant supplies finished fuel to seven Midwestern states, including Illinois, Indiana, Iowa, Michigan, Ohio, Pennsylvania, and Wisconsin, ExxonMobil's Joliet operations page notes. It remains one of the newest major petroleum refineries built in the United States. The Chicagoland fuel market leans heavily on just three refineries — ExxonMobil Joliet, BP Whiting, and Citgo in Lemont — which together represent 909,000 barrels per day of combined capacity, according to AccuWeather. Energy analysts note the local market has virtually no excess supply cushion when one refinery goes down.
A Familiar Vulnerability at This Same Plant
This isn't the first time a power failure has crippled the Channahon facility. In July 2024, a severe storm and tornado knocked out external power to the same plant, forcing an emergency shutdown that kept major processing units offline for nearly three weeks and was part of a series of outages involving the Joliet refinery and two Ohio refineries that drove Midwest refinery utilization down by 11 percentage points, according to the U.S. Energy Information Administration. That 2024 outage triggered a 2-million-barrel drop in regional gasoline inventories and was severe enough that the U.S. Environmental Protection Agency issued temporary emergency fuel waivers across the Midwest to prevent widespread shortages, easing environmental volatility standards to keep fuel flowing to gas stations, per the U.S. EPA.
Whether Sunday's shorter outage will cause similar unit-level damage remains unclear. The plant's on-site cogeneration system is designed to capture waste energy from refining and convert it into internal electricity and steam to power its 12 primary processing units. An equipment assessment is underway as the refinery works through its site assessment, per the Illinois Environmental Protection Agency.
Local Stakes Beyond the Gas Pump
The refinery is also a major economic presence in Will County, employing approximately 580 full-time workers plus contractor personnel and generating an annual payroll and benefits expenditure of roughly $115 million as of 2025, ExxonMobil's data shows. It is a Will County employer. The plant also maintains a dedicated full-service fire station and a trained Joliet Refinery Fire Brigade, according to ExxonMobil.
The outage lands amid a summer already marked by elevated pump prices across Illinois, with Governor Pritzker previously pressing oil companies for accountability as prices topped $4.34 a gallon, as Hoodline's earlier reporting detailed. For now, ExxonMobil has not indicated how long the site assessment or air monitoring will take, and the cause of Sunday's outage remains under investigation.
