Ameren (NYSE:AEE), based in St. Louis, Missouri, is a publicly traded energy company that delivers electric and natural gas service to more than 2.4 million electric customers and nearly 1.6 million natural gas customers across central and southern Illinois and central and eastern Missouri. Through its two regulated utility subsidiaries, Ameren Illinois and Ameren Missouri, the company manages transmission, distribution, customer service and grid operations. Ameren also operates Ameren Transmission Company, developing and maintaining high-voltage infrastructure to enhance system reliability and integrate renewable energy resources.
Founded in 1997 through the merger of Union Electric Company and Central Illinois Public Service Company, Ameren draws on over a century of regional energy service history. Ameren Missouri’s lineage dates to the early 1900s with Union Electric, while Ameren Illinois traces its roots to longstanding gas and power enterprises serving Illinois communities. This heritage underpins the company’s focus on operational excellence, safety and customer satisfaction in both urban and rural markets.
Ameren’s generation portfolio spans nuclear, coal, natural gas and renewable assets. Key facilities include the 1,236-megawatt Callaway nuclear power plant, several combined-cycle natural gas and coal-fired stations, and an expanding roster of wind and solar installations. The company is actively modernizing its grid with advanced metering infrastructure, substation automation and digital control systems to improve resilience, operational efficiency and support the growth of intermittent renewable generation.
Under the leadership of President and Chief Executive Officer Warner L. Baxter, Ameren is advancing a strategy to reduce carbon emissions and transition to cleaner energy sources. The company plans to retire or convert coal units, expand large-scale renewables, roll out energy efficiency and demand-response programs, and develop electric vehicle charging networks. Governed by a board with deep expertise in regulated utilities and energy policy, Ameren is committed to long-term infrastructure investment and sustainable energy solutions across its service territories.
