County annual report · FIPS 17163
2020 St. Clair County, IL Power Outage Report
In 2020, customers in St. Clair County, IL went without power for an average of 3.9 hours, a total of 366K customer-hours (Illinois average 5.9 hours). That ranks 47th worst of 102 Illinois counties and 1640th of 3,019 nationally.
Compared with IL, the US and 2019
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in St. Clair County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | August 9, 2020 07:00 | August 17, 2020 12:45 | 8d 5h | 6,055 | 125K |
| 2 | July 19, 2020 12:00 | July 23, 2020 14:45 | 4d 2h | 5,269 | 53K |
| 3 | September 1, 2020 15:15 | September 1, 2020 22:15 | 7h | 4,437 | 8,907 |
| 4 | April 8, 2020 14:00 | April 10, 2020 08:15 | 1d 18h | 2,722 | 10K |
| 5 | January 11, 2020 07:00 | January 13, 2020 15:30 | 2d 8h | 2,652 | 14K |
| 6 | July 15, 2020 07:30 | July 17, 2020 07:45 | 2d | 2,610 | 8,315 |
| 7 | November 14, 2020 20:15 | November 16, 2020 08:15 | 1d 12h | 2,134 | 16K |
| 8 | July 8, 2020 08:15 | July 10, 2020 07:45 | 1d 23h | 2,035 | 21K |
| 9 | June 30, 2020 01:45 | July 2, 2020 04:45 | 2d 3h | 1,805 | 6,641 |
| 10 | September 26, 2020 19:15 | September 26, 2020 21:00 | 1h 45m | 1,640 | 436 |
Outage episodes by size in 2020: 87 reached 100+ customers, 12 reached 1,000+ customers, 0 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 2020, 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 | 2020 | 3.7 hrs | 1.04 | 1.7 hrs | 0.82 |
| Southwestern Electric Coop Inc - (IL) | 2020 | 3.4 hrs | 1.51 | 3.1 hrs | 1.47 |
| Tri-County Electric Coop, Inc (IL) | 2020 | 2.7 hrs | 1.14 | 83 min | 0.85 |
| Monroe County Elec Coop, Inc | 2018 | 1.6 hrs | 0.84 | 1.6 hrs | 0.84 |
| Ameren | - | - | - | - | - |
| Egyptian Electric Coop Assn | - | - | - | - | - |
| 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 94% of Illinois's customers in 2020; 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, 2020, 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/2020/illinois/st-clair-county