The Associated Press reports that several southeast Texas refineries and chemical plants shut down by power outages have restarted. The restart processes at facilities owned by BP, Dow Chemical and Valero were expected to take up to several days to complete. BP''s refinery, which is the third largest in the country and can process up to 460,000 barrels of crude oil each day, began its restart process last Thursday evening. The others began restarting Friday. Dow Chemical expected the restart process at its facility, which manufactures more than 30 chemical products used in such things as plastics, solvents and pharmaceuticals, to continue through the weekend. The facilities in Texas City, located 35 miles southeast of Houston, were knocked offline after experiencing power outages late Monday evening and early Tuesday morning. There were additional outages Tuesday evening and early Wednesday. The oil and chemical companies said they held off bringing their facilities back online until they were satisfied the cause of the outages had been determined.