Ameren Illinois Company: Outages & Reliability
As of October 7, 2026 09:00 UTC, about 31 Ameren Illinois Company customers are without power in 5 counties.
Ameren Illinois Company is an investor owned utility serving 81 counties in Illinois. In 2024, its customers went an average of 3.7 hours without power (SAIDI), across about 1.1 interruptions each. That ranks it #191 of 468 US utilities by reliability, where #1 is the most reliable. Its outage duration is better than the US average and worse than the Illinois median (2.6 h).
Official reliability (EIA 2024)
US EIARanks #191 of 468 US utilities by reliability (#1 = most reliable) · worse than the Illinois median (2.6 h).
Reliability over time
Official EIA SAIDI, hours without power per customer per year (IEEE, incl. major events). Over this period Ameren Illinois Company’s reliability has been worsening (lower is better).
Counties served by Ameren Illinois Company (81)
Service territory reported to EIA-861; each links to live outage status and history.
- Adams County, IL
- Alexander County, IL
- Bond County, IL
- Brown County, IL
- Bureau County, IL
- Calhoun County, IL
- Cass County, IL
- Champaign County, IL
- Christian County, IL
- Clark County, IL
- Clay County, IL
- Clinton County, IL
- Coles County, IL
- Crawford County, IL
- Cumberland County, IL
- De Witt County, IL
- Douglas County, IL
- Edgar County, IL
- Edwards County, IL
- Effingham County, IL
- Fayette County, IL
- Ford County, IL
- Franklin County, IL
- Fulton County, IL
- Gallatin County, IL
- Greene County, IL
- Hancock County, IL
- Henderson County, IL
- Henry County, IL
- Iroquois County, IL
- Jackson County, IL
- Jasper County, IL
- Jefferson County, IL
- Jersey County, IL
- Johnson County, IL
- Kendall County, IL
- Knox County, IL
- LaSalle County, IL
- Lawrence County, IL
- Livingston County, IL
- Logan County, IL
- Macon County, IL
- Macoupin County, IL
- Madison County, IL
- Marion County, IL
- Marshall County, IL
- Mason County, IL
- Massac County, IL
- McDonough County, IL
- McLean County, IL
- Menard County, IL
- Mercer County, IL
- Monroe County, IL
- Montgomery County, IL
- Morgan County, IL
- Moultrie County, IL
- Peoria County, IL
- Perry County, IL
- Piatt County, IL
- Pike County, IL
- Pulaski County, IL
- Putnam County, IL
- Randolph County, IL
- Richland County, IL
- Saline County, IL
- Sangamon County, IL
- Schuyler County, IL
- Scott County, IL
- Shelby County, IL
- St. Clair County, IL
- Stark County, IL
- Tazewell County, IL
- Union County, IL
- Vermilion County, IL
- Wabash County, IL
- Warren County, IL
- Washington County, IL
- Wayne County, IL
- White County, IL
- Williamson County, IL
- Woodford County, IL
What causes Ameren Illinois Company outages
Share of outage-time by reported cause across the counties it serves (territory-wide, may include other utilities in shared counties).
Ameren Illinois Company: FAQ
- How reliable is Ameren Illinois Company?
- Ameren Illinois Company customers averaged 3.7 hours without power in 2024 (SAIDI), which is below average and better than the US average, worse than the Illinois median (2.6 h), per official US EIA data.
- Where does Ameren Illinois Company rank among US electric utilities?
- By official EIA SAIDI, Ameren Illinois Company is #191 of 468 US utilities by reliability that report reliability and serve at least three counties, #1 being the most reliable. Overall it is better than the US average.
- How many customers does Ameren Illinois Company serve?
- Ameren Illinois Company serves 81 counties across Illinois, per its EIA-861 service territory filing.
- Where does Ameren Illinois Company provide power?
- Ameren Illinois Company operates in Illinois. The full list of counties served is below, each linked to its live outage status.
Reliability metrics (SAIDI/SAIFI) and service territory from the US EIA Form 861. SAIDI/SAIFI are IEEE-standard, including major event days. Primary state: Illinois.
Data from EIA Form 861 (utility reliability) and DOE/ORNL ODIN, every source we read. Live data as of .