Valero Energy Corp. is responding to a fire at its Port Arthur refinery in Texas, the company confirmed late Monday. The incident occurred in a diesel hydrotreater unit, a critical component for processing diesel fuel. Valero's emergency response teams are on site managing the situation.

Diesel hydrotreater units play a vital role in removing sulfur from diesel fuel to meet environmental standards. A fire in this equipment could potentially impact refinery operations and production capacity. The Port Arthur facility is one of Valero's largest refineries, with a capacity of 635,000 barrels per day.

Refinery fires can lead to temporary shutdowns and may affect fuel supply chains. Valero has not yet provided details on the extent of damage or how long operations might be disrupted. The company stated it is working to assess the situation and will provide updates as more information becomes available.