SUGAR LAND--June 7, 2021--The U.S. currently imports the majority of its aluminum from Canada, primarily because the electricity needed to produce the metal is cheaper north of the border. But Century Aluminum (NASDAQ:CENX) (Chicago, Illinois), the largest producer of primary (non-recycled) aluminum in the U.S., last week announced plans for increased production and capital investment at its primary aluminum smelter in South Carolina.