Callaway Plant, completed in 1984, remains one of the top-performing nuclear plants in the country.

In 1984, UE completed its Callaway nuclear plant. Located about 100 miles west of St. Louis and 10 miles southeast of Fulton, Mo., Callaway's 1,143-megawatt capacity makes it the largest single unit in the Ameren system. In its first year of operation, Callaway set a nuclear power industry record for the most electricity ever produced in the United States. Long recognized as a top performing plant, Callaway has earned an enviable safety record and a reputation for quality and reliability.