Company Overview - Phillips 66 will begin winding down operations at its Los Angeles-area refinery this week, with a permanent closure expected in the fourth quarter of 2025 [1] - The refinery has a capacity of 139,000 barrels per day and is set to cease operations following the company's announcement last year [1][10] Employee Impact - More than half of the 600 employees at the refinery are represented by the United Steelworkers Union, with most facing layoffs in December [2][10] - A small number of workers may be transferred to the Phillips 66 marine oil terminal in Los Angeles, but the company has not commented on post-closure employment plans [2] Market Implications - The closure of Phillips 66's refinery, along with Valero Energy Corporation's Benicia facility, which has a capacity of 145,000 barrels per day, will impact approximately 20% of California's gasoline supply [3][10] - These closures are expected to tighten fuel markets and may contribute to volatility in pump prices as California increases reliance on imports and alternative sources to meet demand [3] Operational Details - The shutdown process will be multi-phased and complex, involving environmental remediation and coordination with local agencies [4] - Phillips 66 has stated its commitment to work with state officials to supply fuel and address the long-term fate of its strategically located properties near the Port of Los Angeles [4]