ExxonMobil has restarted the gasoline-producing fluid catalytic cracking unit (FCCU) at its massive Beaumont, Texas, refinery, two days after an unexpected shutdown temporarily disrupted operations, according to sources familiar with the plant.

The 120,000-barrel-per-day FCCU went offline Tuesday night following a malfunction, prompting flaring visible across the refinery complex. The company notified the Texas Commission on Environmental Quality that flaring would continue for roughly 24 hours. Exxon confirmed neither the cause nor the duration of the outage, but sources said the unit was brought back online late Thursday.

While brief, the shutdown was watched closely across the Gulf Coast refining hub. The Beaumont facility—now running at 612,000 barrels per day after its recent crude expansion—is one of the largest in the United States, producing large volumes of gasoline, diesel, and jet fuel. The FCCU, in particular, is a workhorse of the refining process, converting heavy gas oils into high-value gasoline blendstocks that feed U.S. fuel markets.

Any extended outage at Beaumont can trigger a domino effect through gasoline supply chains at a time when inventories remain tight heading into the winter blend transition. Gulf Coast gasoline stockpiles, for now, remain near their five-year average after weeks of draws, and refiners are preparing for seasonal maintenance while balancing weaker demand signals. A longer FCCU disruption could have lifted regional cash prices or widened spreads against benchmark futures, but market reaction was muted Friday—suggesting traders expect output to normalize quickly.

The restart underscores how finely tuned U.S. refining capacity has become. With margins tightening from summer highs and few new refineries being built, even minor mechanical failures at major plants can briefly unsettle the market. Exxon’s Beaumont complex, expanded last year to process more domestic light crude, is critical to maintaining that balance.

For now, the incident appears contained. But in a U.S. market operating near full tilt, every flare event is a reminder that the margin for error is razor thin.

By Julianne Geiger for Oilprice.com

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