Ameren owns rate-regulated generation, transmission, and distribution networks that deliver electricity and natural gas through the company's two main subsidiaries, Ameren Missouri and Ameren Illinois. It serves 2.5 million electricity customers and 900,000 natural gas customers across its two service territories.

Ameren owns rate-regulated generation, transmission, and distribution networks that deliver electricity and natural gas through the company's two main subsidiaries, Ameren Missouri and Ameren Illinois. It serves 2.5 million electricity customers and 900,000 natural gas customers across its two service territories.

Ameren owns rate-regulated generation, transmission, and distribution networks that deliver electricity and natural gas through the company's two main subsidiaries, Ameren Missouri and Ameren Illinois. It serves 2.5 million electricity customers and 900,000 natural gas customers across its two service territories.

St. Louis-based Ameren Corp. is a fully regulated public utility that serves 2.5 million electric customers and 900,000 natural gas customers through its Ameren Missouri and Ameren Illinois regulated subsidiaries. Customers are located in Missouri and Illinois. Ameren Missouri provides vertically integrated electric service, with generating capacity of about 9,300 MWs. Ameren Illinois provides electric transmission service as well as natural gas delivery. Ameren Transmission Co. of Illinois develops regional electric transmission projects to add to the utility's 8,000 existing FERC transmission miles. AEE also operates one nuclear generating facility. Consolidated revenues in 2025 were $8.8 billion, of which 87% were from electricity operations. Management is committed to electric and gas service expansion and infrastructure improvements in the company's regulated service territories. Ameren has exited the volatile nonregulated merchant energy business and has shown little interest in acquiring nonregulated assets. The company has nuclear operations but still relies heavily on coal. Of the utility's generating capacity, the current fuel mix is about 55% coal, 30% nuclear, 1% natural gas/oil, and 15% renewables. Management estimates that coal generation will drop to about 3% of rate-base generation by the end of 2028. The company is targeting net-zero carbon emissions by 2045 and has been adding solar and wind projects in Missouri. AEE has about 9,000 employees. The shares are a component of the S&P 500. The company's market cap is approximately $30.3 billion.