ExxonMobil's Baton Rouge Refinery in Baton Rouge, Louisiana is the fourth-largest oil refinery in the United States and twelfth-largest in the world, with an input capacity of 502,500 barrels per day as of January 1, 2016. The refinery is the site of the first commercial fluid catalytic cracking plant that began processing at the refinery on May 25, 1942. Standard Oil first erected the refinery in 1909. Today's facility is part of a complex made of nine individual plants across the region.