Ameren Corporation operates as a public utility holding company. Subsidiaries Union Electric Company, doing business as 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 is the major electric utility in the state of Missouri. It supplies electric and natural gas service to a 24,000-square-mile area in central and eastern Missouri. This area has an estimated population of 2.8 million and includes the Greater St. Louis area. Ameren Missouri supplies electric service to 1.2 million customers and natural gas service to 0.1 million customers. Ameren Illinois Company, doing business as Ameren Illinois, operates rate-regulated electric and natural gas transmission and distribution businesses in Illinois. Ameren Illinois supplies electric and natural gas utility service to portions of central and southern Illinois having an estimated population of 3.1 million in an area of 40,000 square miles. Ameren Illinois supplies electric service to 1.2 million customers and natural gas service to 0.8 million customers. The company has various other subsidiaries that conduct activities, such as the provision of shared services. The company also has a subsidiary, Ameren Transmission Company of Illinois (ATXI), which operates a FERC (Federal Energy Regulatory Commission, a United States government agency) rate-regulated electric transmission business. ATXI is developing MISO (Midcontinent Independent System Operator, Inc., a regional transmission organization)-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. Natural Gas Supply for Distribution Ameren Missouri and Ameren Illinois are responsible for the purchase and delivery of natural gas to their utility customers. Ameren Missouri and Ameren Illinois each develop and manage a portfolio of natural gas supply resources. 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 primarily during peak demand periods. Ameren Missouri and Ameren Illinois primarily 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. Regulation Ameren Missouri Electric: Ameren Missouri’s electric operating revenues are subject to regulation by the Missouri Public Service Commission (MoPSC). Ameren Missouri is a member of MISO, and its transmission rate is calculated in accordance with the MISO Open Access Transmission Tariff (OATT). Natural Gas: Ameren Missouri’s natural gas operating revenues are subject to regulation by the MoPSC. Ameren Illinois Electric: Ameren Illinois' electric distribution delivery service operating revenues are regulated by the Illinois Commerce Commission (ICC), while its electric transmission delivery service operating revenues are regulated by the FERC. Ameren Illinois participates in the performance-based formula ratemaking process established pursuant to the Illinois Energy Infrastructure Modernization Act (IEIMA). Ameren Illinois is also subject to performance standards under the IEIMA. Ameren Illinois is a member of MISO and its transmission rate is calculated in accordance with the MISO OATT. Natural Gas: Ameren Illinois’ natural gas operating revenues are subject to regulation by the ICC. ATXI ATXI is a member of MISO, and its transmission rate is
ameren corporation (AEE:New York)
1901 Chouteau Avenue
St. Louis, MO 63103
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