Valero, on May 20, experienced a partial power outage at its 170,000-barrel-per-day (BBL/d) McKee Refinery in Sunray Texas, which caused the 76,000-BBL/d Fluid Catalytic Cracker Unit (FCCU), 30,000-BBL/d Hydrocracker and the 9,500-BBL/d SF Alkylation (SF Alky) Unit to shut down. The units are expected to be back online in the next 12 to 24 hours.