County annual report · FIPS 17163
2023 St. Clair County, IL Power Outage Report
In 2023, customers in St. Clair County, IL went without power for an average of 12.2 hours, a total of 1.2M customer-hours (Illinois average 4.0 hours). That ranks 29th worst of 102 Illinois counties and 699th of 2,977 nationally.
Compared with IL, the US and 2022
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in St. Clair County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 30, 2023 23:45 | July 8, 2023 03:30 | 7d 3h | 13,156 | 644K |
| 2 | July 29, 2023 20:30 | August 6, 2023 12:45 | 7d 16h | 8,463 | 171K |
| 3 | April 16, 2023 00:00 | April 18, 2023 12:30 | 2d 12h | 6,772 | 130K |
| 4 | April 18, 2023 14:00 | April 21, 2023 14:30 | 3d | 4,728 | 5,576 |
| 5 | August 25, 2023 17:45 | August 27, 2023 20:00 | 2d 2h | 3,669 | 15K |
| 6 | May 7, 2023 21:15 | May 9, 2023 05:00 | 1d 7h | 3,641 | 11K |
| 7 | May 13, 2023 18:30 | May 16, 2023 03:15 | 2d 8h | 2,396 | 10K |
| 8 | January 21, 2023 21:30 | January 22, 2023 03:15 | 5h 45m | 2,389 | 8,087 |
| 9 | July 25, 2023 09:45 | July 26, 2023 03:00 | 17h 15m | 2,279 | 2,698 |
| 10 | July 14, 2023 12:30 | July 19, 2023 02:00 | 4d 13h | 2,170 | 31K |
Outage episodes by size in 2023: 92 reached 100+ customers, 17 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 2023, 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 | 2023 | 9.9 hrs | 1.33 | 1.9 hrs | 0.82 |
| Southwestern Electric Coop Inc - (IL) | 2023 | 6.2 hrs | 2.74 | 4.3 hrs | 2.22 |
| Egyptian Electric Coop Assn | 2023 | 4.4 hrs | - | - | - |
| Tri-County Electric Coop, Inc (IL) | 2023 | 4.3 hrs | 1.91 | 52 min | 0.52 |
| 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 2023; 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, 2023, 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/2023/illinois/st-clair-county