Ameren Corporation is a utility company which generates and distributes electricity and natural gas to residential, commercial, industrial and wholesale end markets in Missouri and Illinois. The company has four business segments - Ameren Missouri, Ameren Illinois Electric Distribution, Ameren Illinois Natural Gas and Ameren Transmission. The Ameren Missouri segment includes all the operations of Ameren Missouri. Ameren Missouri generates electricity through its coal-fired, nuclear, hydroelectric, natural gas or oil-fired and renewable facilities. Ameren Illinois Electric Distribution consists of the electric distribution business of Ameren Illinois. Ameren Illinois Natural Gas consists of the natural gas business of Ameren Illinois. Ameren Transmission is primarily composed of the aggregated electric transmission businesses of Ameren Illinois and Ameren Transmission Company of Illinois (ATXI) and associated Ameren (parent) interest charges.