Ameren Corp was formed in 1997 by the merger of Ameren Missouri and CIPSCO Inc., which was the parent company of CIPS. The Company acquired CILCORP Inc., which was the parent company of CILCO, in 2003 and IP in 2004. CIPS, CILCO, and IP were merged to form Ameren Illinois in 2010. The Company operates in two segments Ameren Missouri and Ameren Illinois. Ameren Missouri operates a rate-regulated electric generation, transmission, and distribution business and a rate-regulated natural gas transmission and distribution business in Missouri. Ameren Missouri's electric supply is generated from its energy centers. Ameren Missouri has coal transport agreements with Union Pacific Railroad and Burlington Northern Santa Fe Railway. It has entered into uranium, uranium conversion, uranium enrichment, and fabrication contracts to procure the fuel supply for its Callaway nuclear energy center. Its portfolio of natural gas supply resources includes firm transportation capacity and firm no-notice storage capacity leased from interstate pipelines. Ameren Illinois operates rate-regulated electric and natural gas transmission and distribution businesses in Illinois. In 2015, Ameren Illinois supplied power for approximately 26% of its kilowatt hour sales. Power purchased by Ameren Illinois for its retail customers comes either through procurement processes conducted by the IPA or through markets operated by MISO. Ameren Missouri and Ameren Illinois use Panhandle Eastern Pipe Line Company, Trunkline Gas Company, Natural Gas Pipeline Company of America, Mississippi River Transmission Corporation, Northern Border Pipeline Company, and Texas Eastern Transmission Corporation interstate pipeline systems to transport natural gas to their systems. These resources include firm gas supply under term agreements with producers, interstate and intrastate firm transportation capacity, firm no-notice storage capacity leased from interstate pipelines, and on-system storage facilities to maintain natural gas deliveries to customers throughout the year, and especially during peak demand periods. The Company has various other subsidiaries that conduct activities such as the provision of shared services. It also has a subsidiary, ATXI that operates a FERC rate-regulated electric transmission business. ATXI is developing MISO-approved electric transmission projects, including the Illinois Rivers, Spoon River, and Mark Twain projects. The Company is also pursuing projects to improve electric transmission system reliability within Ameren Missouri's and Ameren Illinois' service territories as well as competitive electric transmission investment opportunities outside of these territories, including investments outside of MISO. The Company owns an integrated transmission system that is comprised of the transmission assets of Ameren Missouri, Ameren Illinois, and ATXI. It also operates two balancing authority areas: AMMO and AMIL. The Ameren transmission system directly connects with 15 other balancing authority areas for the exchange of electric energy. The Company is subject to federal, state, and local regulation. Certain of its operations are subject to federal, state, and local environmental statutes and regulations relating to the safety and health of personnel, the public, and the environment.
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