- CEO
- Martin J. Lyons Jr.
- Full Time Employees
- 3,830
- Sector
- Utilities
- Industry
- Regulated Electric
- Address
- 1901 Chouteau Avenue Saint Louis MO United States of America 63103
- IPO Date
- Sep 7, 2006
- Business
- Union Electric Company, doing business as Ameren Missouri and a subsidiary of Ameren Corporation, engages in the rate-regulated generation, transmission, and distribution of electricity and the distribution of natural gas primarily to customers in central and eastern Missouri. Founded in 1902 and headquartered in St. Louis, Missouri, the company generates electricity from a diverse portfolio including coal, nuclear, natural gas, hydroelectric, methane gas, and solar sources; it operates nine power plants serving over 1.2 million electric customers and 110,000 natural gas customers, with more than half of its electric customers in the St. Louis metropolitan area. The company provides electric services through transmission and distribution infrastructure and natural gas services via a regulated distribution network, targeting residential, commercial, industrial, and municipal customers across its service territory. In recent strategic developments, Ameren Missouri unveiled a revised generation strategy in February 2025 to accelerate investments totaling $16.2 billion over five years, including 1,600 megawatts of natural gas-fired generation, 2,700 megawatts of wind and solar, 1,000 megawatts of battery storage by 2030, and 1,500 megawatts of new nuclear by 2045 to meet up to 2 gigawatts of new demand by 2032 from data centers and manufacturing. The Missouri Public Service Commission approved its Powering Missouri Growth Plan in November 2025, introducing a large-load rate structure with consumer protections such as upfront interconnection costs and revenue sharing for high-usage customers needing 75 megawatts or more; the company also plans an 800-megawatt simple-cycle natural gas energy center with battery storage at Big Hollow and continues expanding community solar programs and clean energy options.