
As part of its first-quarter 2026 earnings call, executive vice-president and chief operating officer Gary Simmons provided an update on work completed at the refinery since the Mar. 23 fire in the diesel hydrotreater and the subsequent precautionary shutdown.
Simmons said the investigation into the cause of the fire is ongoing, and that “all employees were accounted for” and that “no refinery injuries were reported as a result of the incident.”
Major processing units return
As reported in early April, the smaller crude unit train is up and running, Simmons said, adding that now back online are “the coker, hydrocrackers, the reformer, and a distillate hydrotreater.”
Valero is “currently starting up the larger crude unit as we speak, along with the FCC and alkylation unit,” he said, noting that by May 1, he expects throughput at the Port Arthur refinery to look “fairly normalized.”
The diesel hydrotreater that caught fire and an adjacent kerosene hydrotreater remain offline, Simmons said, “which could negatively impact capture rates some in the second quarter.”
While the kerosene hydrotreater is expected back online by this year’s third quarter, the diesel hydrotreater sustained “extensive damage,” he said, and a timeline for the rebuild is still unknown.
Hydrotreater damage hits second-quarter throughput
The impact of the Port Arthur shutdown is reflected in the company’s throughput guidance for this year’s second quarter.
For the Gulf Coast region, specifically, the company expects refining throughput volumes of 1.69-1.74 million b/d, reflecting reduced rates at Port Arthur.
Valero expects to update its 2026 capital investment guidance after determining a definitive cost estimate and expected repair timeline.





















