Ameren Illinois Company Overview
Pro stress-test →Ameren Illinois operates rate-regulated electric transmission, electric distribution, and natural gas distribution businesses in Illinois. The company supplies electric service to 1.2 million customers and natural gas service to 0.8 million customers across a 43,700-square-mile service territory in central and southern Illinois.
Strategic Profile
Pro stress-test →Ameren Illinois is a subsidiary of Ameren Corporation, a public utility holding company. The company operates as a rate-regulated regional utility serving a core geographic footprint with integrated electric and gas distribution networks. As of January 2026, Ameren's activities support around 55,200 jobs in Missouri and Illinois through direct employment and related economic activity.
Competitive Landscape
Pro stress-test →As a rate-regulated regional utility, Ameren Illinois operates with geographic and regulatory monopoly protections rather than direct commercial competition. Primary "competitors" in the broader energy landscape include alternative energy providers and other regulated utilities in adjacent markets. The company competes for capital investment and regulatory approval with other regional utilities and faces pressure from renewable energy expansion and distributed generation trends.
Industry Context
Ameren Illinois Company operates in Electric and gas distribution utilities.
Key facts
Founded: 1923 · Headquarters: Collinsville, Illinois · Employees: N/A · Revenue: $1.3B–$1.4B · Market cap: N/A