A sudden drop in temperature that was almost a week-long shut down individual units and occasionally entire plants at 25 refineries in Texas, New Mexico, Oklahoma, Louisiana, and Tennessee.
Six million barrels per day (bpd) of national refining capacity was out of production before refineries in Beaumont, Corpus Christi, and Port Arthur, Texas, began restarting on Feb. 22.
By comparison, Hurricane Harvey idled a fifth of national refining capacity at the end of August 2017.
The last major unit shut by the storm, the 38,000 barrel-per-day (bpd) vacuum distillation unit (VDU) at Chevron Corp’s 112,229 bpd Pasadena, Texas, refinery, restarted on Wednesday, according to sources familiar with plant operations.
But like in a hurricane, problems inside the plants were compounded by outages of larger systems on which the refineries rely.
Problems began on the night of Feb. 14 when the 30-degree drop to 15 degrees Fahrenheit froze instrumentation needed to operate production units, said sources familiar with operations at several refineries.
Crews struggled throughout the night maintaining minimum levels of production, but on Feb. 15 utilities failed, including industrial gas supplies, natural gas for power and steam production, and external power, forcing complete shutdowns at many of the plants, the sources said.
Oil companies have begun describing the financial cost of the freeze.
Exxon Mobil Corp said at the end of March that the shutdown of its refineries in Baytown and Beaumont, Texas, accounts for as much as a quarter of the estimated $800-million loss the company incurred in February.
The nation’s second-largest refiner, Valero Energy Corp, said last week it will take a charge between $520 million and $535 million for higher electricity and natural gas costs in the first quarter.
Eight of Valero’s 12 U.S. refineries were shut by the storm.
Phillips 66 said its loss for the first quarter could reach $865 million, but up to $210 million of that is due to a pre-tax impairment for a pipeline project.