Sept. 14 (Bloomberg) -- Valero Energy Corp., the largest U.S. refiner, said it's starting up its Port Arthur, Texas, refinery after a hurricane shut the plant yesterday.

``Startup activities are under way at the plant with some units on circulation,'' spokesman Bill Day said in an e-mail today. ``The refinery is working towards returning to production by the end of next week.''

To contact the reporter on this story: Robert Tuttle in New York at rtuttle@bloomberg.net

Last Updated: September 14, 2007 10:13 EDT