- Business
- Union Electric Company (UELMO), doing business as Ameren Missouri and a subsidiary of Ameren Corporation, operates a rate-regulated electric generation, transmission and distribution business as well as a rate-regulated natural gas transmission and distribution business primarily in central and eastern Missouri, serving approximately 1.2 million electric customers and 110,000 natural gas customers across a 24,000-square-mile service area that includes the St. Louis metropolitan region; the company principally generates electricity from coal, nuclear fuel including the Callaway Energy Center, and natural gas-fired energy centers, while procuring natural gas via interstate pipelines such as Panhandle Eastern Pipe Line Company and managing a portfolio of natural gas supply resources. Founded in 1902 and headquartered in St. Louis, Missouri, Union Electric Company provides electric supply from its energy centers and supports customer energy-efficiency programs under the Missouri Energy Efficiency Investment Act. In recent developments, Ameren Missouri received regulatory approval in 2024 for an 800-megawatt simple-cycle natural gas Castle Bluff Energy Center investment of approximately $900 million, expected online by 2027 to enhance reliability; acquired three utility-scale solar facilities--Huck Finn Renewable Energy Center (200 megawatts), Boomtown Renewable Energy Center (150 megawatts), and Cass County Renewable Energy Center (150 megawatts)--for a combined 500 megawatts and $900 million in 2024 to accelerate renewable additions; implemented new electric service rates effective June 1, 2025; revised its Integrated Resource Plan in February 2025 to address up to 1.5-2 gigawatts of new demand by 2032 through accelerated generation investments including 4,700 megawatts of renewables by 2036 and 800 megawatts of battery storage; and advanced a $16.2 billion Smart Energy Plan with grid hardening measures such as 134 substations, 250 miles of subtransmission lines, 1.3 million smart meters, and 1,700 smart switches to improve resiliency.