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Union Electric Company, doing business as Ameren Missouri, engages in the electric generation, transmission, and distribution business in Missouri. It generates electricity through coal, nuclear, natural gas, hydroelectric, methane gas, and solar energy sources. The company is also involved in the rate-regulated natural gas distribution business. It supplies electric and natural gas services to customers in central and eastern Missouri. The company was founded in 1902 and is based in Saint Louis, Missouri. Union Electric Company operates as a subsidiary of Ameren Corporation.