Ameren Corporation is an energy holding company that primarily engages in the generation, transmission and distribution of electricity, as well as the distribution of natural gas. Through its regulated utilities, Ameren delivers power to a diverse customer base comprised of residential, commercial, industrial and wholesale customers. The company’s electric operations encompass a mix of conventional and renewable generation sources, while its gas business focuses on safe and reliable delivery to homes and businesses.
Headquartered in St. Louis, Missouri, Ameren was formed in 1997 through the merger of Union Electric Company and Central Illinois Public Service Company. Since its inception, the company has invested in upgrading its infrastructure, expanding its generation portfolio and modernizing its grid to enhance reliability and resilience. Ameren has also placed emphasis on environmental stewardship by pursuing emissions reductions and integrating renewable energy projects.
Ameren serves approximately 2.4 million electric customers and 0.4 million natural gas customers across a service territory that spans central and southern Illinois as well as eastern Missouri. Its transmission network connects key generation assets to distribution systems, supporting regional power flows and facilitating energy market operations. The company works closely with state regulators and regional transmission organizations to maintain grid stability and meet evolving regulatory requirements.
In recent years, Ameren has accelerated its clean energy initiatives, targeting the development of solar and wind projects alongside energy efficiency programs. The company’s long-term planning emphasizes decarbonization while maintaining affordability and reliability for its customers. Ameren’s executive leadership and board of directors continue to guide strategic investments aimed at transitioning the utility towards a sustainable energy future.