Internal reports indicate that Mexico's Olmeca refining plant ceased operations on Monday.

According to two internal reports, Mexico's Olmeca Refinery, located at the Gulf Port of?Dos Bocas, and operated by state oil company?Pemex ceased its operations Monday due to a power outage.

Sources claim that Olmeca has resumed operations at its unit on Tuesday.

Pemex said it would consult the relevant departments before resuming operations. Pemex said on Monday that it initiated a safe shut down after a change in pressure caused the catalytic convert to smoke.

Pemex stated at the time, "crude oil processing was under control."

The reports showed ?that Olmeca shut ?down its coking plant, catalytic plant and hydrodesulphurization plants due to the outage. According to one of the reports, the processing of 150,000 crude oil barrels was delayed during the outage.

Olmeca, located in the southern state of Tabasco is one of Mexico's biggest refineries. The refinery has been plagued by a number of operational problems, and is still far below its processing capacity of 340,000 barrels per day.

It shut down in August of last year due to a?power failure, only four months after another shutdown was caused by an incident. The plant started operations in 2024.

According to Pemex, Olmeca's crude processing capacity reached its highest ever level in December 2025. (Reporting and editing by Chris Reese, Alistair Bell and Ana Isabel Martinez)

(source: Reuters)