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US west coast coke output hits record low

  • Market: Petroleum coke
  • 04/12/25

US west coast marketable petroleum coke production in September hit a record low in data going back to 2005, as some California refineries move forward with plans to wind down production.

Production on the US west coast totalled 323,400t in September, down by 24pc from a year earlier and off by 26pc from August, according to the latest data from the US Energy Information Administration. Refinery utilisation in the region averaged 90pc during the month, down by 3 percentage points on the year and off by 4 percentage points from August.

Although Phillips 66 did not completely cease processing crude at its 139,000 b/d Los Angeles, California, refining complex until mid-October, it is possible that shutdown processes at this refinery contributed to lower US west coast coke output in September. The refinery had already idled a number of its units by the beginning of October, largely on the gasoline production side. Flaring was also reported at a number of California refineries during the month, such as Marathon Petroleum's 365,000 b/d Los Angeles refinery and Chevron's 269,000 b/d El Segundo refinery, while PBF Energy's 156,400 b/d Martinez, California, refinery was still running at partial capacity.

US west coast coke output may continue to decline in the coming months, further pressured by the planned shutdown of Valero's 145,000 b/d refinery in Benicia, California, in the first half of 2026. But Marathon is spending millions to upgrade its Los Angeles complex, even as rivals shutter plants.

Lower output on the US west coast contributed to a drop in total US coke production during September. Output across all regions totalled 3.1mn t, down by 6pc from a year earlier and off by 4pc on the month. Total US refinery utilisation rates averaged 93pc in September, up by 3 percentage points on the year but down by 2 percentage points from August.

Production also declined significantly on the US Gulf coast, falling to just under 1.9mn t. Output dropped by 11pc on the year and by 1pc from a month earlier. But refinery utilisation in this region averaged 93pc during the month, up by 3 percentage points from a year earlier and down by 3 percentage points from August.

Flaring was reported at Motiva's 626,000 b/d refinery in Port Arthur, Texas; two of ExxonMobil's Texas refineries; Phillip 66's 149,000 b/d Borger, Texas, refinery; and other plants across the region in September, which may have contributed to lower coke production. TotalEnergies was also conducting a turnaround at its 238,000 b/d refinery in Port Arthur during the month.

And production decreased to 40,100t on the US east coast, down by 5pc from a year earlier but up by 11pc on the month. Refinery utilisation on the US east coast averaged 89pc in September, up by 3 percentage points on the year and down by 1 percentage point from August.

Production declines across these regions offset an increase in the US midcontinent and Rocky Mountains. Output in these areas rose by 19pc and 15pc on the year in September, respectively.

Refinery utilisation in the US midcontinent averaged 95pc during the month, up by 4 percentage points on the year and flat from August. US Rocky Mountain refinery utilisation averaged almost 100pc, up by 4 percentage points from a year earlier and nearly flat from the previous month.

US coke output'000t
RegionSep 25±% Sep 24±% Aug 25Jan-Sep 25±% Jan-Sep 24
Atlantic coast41.0-511350.5-7
Midcontinent789.81906,920.54
Gulf coast1,894.4-11-116,643.4-4
Rocky Mountains94.215-6821.613
West coast323.4-24-263,855.9-9
US total3,142.8-6-428,591.8-3

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