Ameren Corp (NYSE: AEE) is a regulated electric and natural gas utility company that generates, transmits, and distributes energy to customers across Missouri and Illinois. It earns revenue by charging rates approved by state and federal regulators for electricity and natural gas delivery services. The company operates through two principal regulated subsidiaries: Union Electric Company (doing business as Ameren Missouri) and Ameren Illinois Company, both wholly owned as of January 30, 2026. As a rate-regulated utility, revenue is largely determined by approved tariffs rather than market pricing, providing predictable cash flows tied to the rate base and customer usage volumes. The business is capital-intensive by structure, with significant investment in generation, transmission, and distribution infrastructure. Ameren Corp files its combined annual reports alongside Union Electric Company and Ameren Illinois Company, each as a separate SEC registrant. The company's common stock trades on the New York Stock Exchange under the ticker AEE.

Revenue model

Rate-regulated utility revenue from electricity generation, transmission, and distribution, and natural gas distribution, priced under tariffs approved by state and federal regulators. Revenue tracks approved rates applied to customer energy consumption volumes.

Products and services

Regulated electric generation, electric transmission, electric distribution, natural gas distribution, customer energy-efficiency programs, renewable energy, and nuclear generation (Callaway Energy Center referenced in FY2025 10-K filing).

Customers and end markets

Residential, commercial, and industrial electricity and natural gas customers in Missouri and Illinois. Customer energy-efficiency programs referenced in the filing indicate direct retail end-market exposure.

Value-chain role

Vertically integrated regulated utility operating as generator, transmitter, and distributor of electricity, and distributor of natural gas, serving as the franchised end-point provider to customers in regulated service territories.

Geographic exposure

Missouri (Union Electric Company / Ameren Missouri) and Illinois (Ameren Illinois Company). Operations are domestic and concentrated in the Midwest United States.

Source: SEC 10-K, filed 2026-02-18

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