County annual report · FIPS 17163
2025 St. Clair County, IL Power Outage Report
In 2025, customers in St. Clair County, IL went without power for an average of 6.6 hours, a total of 625K customer-hours (Illinois average 2.5 hours). That ranks 29th worst of 102 Illinois counties and 1209th of 3,000 nationally.
Compared with IL, the US and 2024
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in St. Clair County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | March 14, 2025 14:00 | March 19, 2025 00:45 | 4d 10h | 18,062 | 357K |
| 2 | March 19, 2025 12:15 | March 20, 2025 06:30 | 18h 15m | 6,641 | 17K |
| 3 | September 20, 2025 17:30 | September 23, 2025 03:30 | 2d 10h | 5,635 | 24K |
| 4 | June 24, 2025 17:00 | June 25, 2025 01:15 | 8h 15m | 3,757 | 5,543 |
| 5 | January 23, 2025 09:15 | January 26, 2025 00:00 | 2d 14h | 3,404 | 3,329 |
| 6 | March 4, 2025 13:00 | March 6, 2025 04:15 | 1d 15h | 3,220 | 7,970 |
| 7 | August 12, 2025 07:45 | August 13, 2025 01:30 | 17h 45m | 2,873 | 6,168 |
| 8 | May 16, 2025 17:15 | May 18, 2025 22:15 | 2d 5h | 2,764 | 24K |
| 9 | August 15, 2025 13:00 | August 16, 2025 06:15 | 17h 15m | 2,674 | 8,840 |
| 10 | May 11, 2025 01:00 | May 11, 2025 08:00 | 7h | 2,415 | 2,145 |
Outage episodes by size in 2025: 121 reached 100+ customers, 22 reached 1,000+ customers, 1 reached 10,000+ customers.
Utility reliability filed with the EIA
SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving St. Clair County reported on EIA Form 861 for 2025, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| Ameren Illinois Company | 2024 | 3.7 hrs | 1.13 | 2.0 hrs | 0.91 |
| Southwestern Electric Coop Inc - (IL) | 2024 | 5.1 hrs | 2.21 | 4.4 hrs | 1.78 |
| Egyptian Electric Coop Assn | 2024 | 2.1 hrs | - | - | - |
| Tri-County Electric Coop, Inc (IL) | 2024 | 6.2 hrs | 2.50 | 64 min | 0.73 |
| Monroe County Elec Coop, Inc | 2018 | 1.6 hrs | 0.84 | 1.6 hrs | 0.84 |
| Ameren | - | - | - | - | - |
| Clinton County Elec Coop, Inc | - | - | - | - | - |
| City of Highland | - | - | - | - | - |
| City of Mascoutah - (IL) | - | - | - | - | - |
| Village of Freeburg - (IL) | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about n/a of Illinois's customers in 2025; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 94,355 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
- An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
- Years loaded: 2015–2025. St. Clair County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), St. Clair County, IL annual power outage report, 2025, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2025/illinois/st-clair-county