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Ameren Corporation files a combined annual report describing its rate-regulated electric and natural gas utilities in Missouri and Illinois and transmission subsidiary ATXI. The company operates through four segments: Ameren Missouri, Ameren Illinois Electric Distribution, Ameren Illinois Natural Gas, and Ameren Transmission.
The report explains how state commissions and FERC set rates, including allowed ROEs such as 8.72% for Ameren Illinois electric distribution and 10.48% for certain transmission service. It outlines long-term plans to add natural gas, renewable, battery storage, and nuclear generation, retire coal plants by 2042, meet renewable and zero-emission standards, manage fuel and hedging, and oversee workforce, safety, and cybersecurity risks.
Ameren Illinois Company sold $350 million principal amount of its 5.625% First Mortgage Bonds due 2055, a further issuance of bonds originally issued on March 3, 2025 in the same principal amount. The bonds were offered under an effective shelf registration on Form S-3 with a related prospectus and September 15, 2025 prospectus supplement. Ameren Illinois received approximately $358.1 million in net offering proceeds before expenses from this transaction. The report also files the underwriting agreement, indenture documents, and legal opinions related to the bond offering as exhibits.