Valero Begins Partial Restart of Major Texas Refinery After Explosion, Key Unit Remains Offline

By Rosemary

Valero Energy Corporation has taken initial steps to restore operations at its 380,000-barrel-per-day refinery in Port Arthur, Texas, following a March 23 explosion and fire that forced a full shutdown of the facility, according to individuals familiar with plant activity.

The restart marks a significant development for one of the largest refining complexes on the U.S. Gulf Coast, though operations remain limited as critical repairs continue. Sources indicated that one of the refinery’s crude distillation units, the 115,000-barrel-per-day AVU 147, has resumed operations and is currently processing crude oil. However, a second and larger unit, the 210,000-barrel-per-day AVU-146, remains offline due to damage sustained during the incident.

The outage of AVU-146 stems from a damaged heater tube identified during post-incident inspections. Repair work is ongoing, and the company is expected to bring the unit back online once the necessary fixes are completed. Until then, the refinery’s output will remain constrained, limiting its ability to return to full production capacity.

Crude distillation units are central to refinery operations, serving as the initial stage in processing crude oil by separating it into various components that feed downstream units. Any disruption to these units can significantly affect overall output and product supply, particularly at a facility of this scale.

The Port Arthur refinery plays a notable role in the broader Gulf Coast energy system. The AVU-146 unit alone accounts for approximately 2% of total crude refining capacity across the Gulf Coast states of Texas, Mississippi, and Louisiana — a region that collectively represents more than half of total U.S. refining capacity, estimated at about 9.62 million barrels per day.

Within Texas specifically, the unit represents roughly 3.4% of the state’s atmospheric crude distillation capacity, underscoring its importance to regional fuel production.

The March 23 incident, which originated in a diesel hydrotreater unit, did not result in officially reported injuries at the time. However, a lawsuit has since been filed by an individual who claims to have been injured during the explosion, alleging he was knocked to the ground by the force of the blast. The company has not publicly addressed the legal claim.

In the immediate aftermath of the shutdown, fuel markets reacted quickly. Diesel prices rose by approximately 16 cents per barrel the following day, reflecting concerns over reduced supply from a key refining hub. The Gulf Coast is a critical center for fuel production and distribution in the United States, and disruptions there can ripple through both domestic and global energy markets.

Valero has not publicly commented on the status of the restart or the timeline for full recovery. Industry observers note that the pace of repairs and the safe reactivation of damaged units will be closely watched, as prolonged outages could tighten fuel supplies and contribute to price volatility, particularly during periods of heightened demand.

The partial restart provides some relief to markets, but until all major units are fully operational, the refinery’s contribution to fuel output will remain below normal levels. The situation highlights the vulnerability of large-scale energy infrastructure to unexpected disruptions and the significant economic impact such events can have across the supply chain.