County annual report · FIPS 17199
2022 Williamson County, IL Power Outage Report
In 2022, customers in Williamson County, IL went without power for an average of 1.7 hours, a total of 62K customer-hours (Illinois average 1.6 hours). That ranks 65th worst of 102 Illinois counties and 2389th of 2,976 nationally.
Compared with IL, the US and 2021
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Williamson County, 2022
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | May 13, 2022 22:30 | May 16, 2022 15:15 | 2d 16h | 4,140 | 3,726 |
| 2 | May 10, 2022 01:15 | May 10, 2022 04:15 | 3h | 3,387 | 5,176 |
| 3 | September 6, 2022 14:30 | September 6, 2022 20:45 | 6h 15m | 3,366 | 1,678 |
| 4 | March 11, 2022 22:00 | March 12, 2022 02:45 | 4h 45m | 1,547 | 4,944 |
| 5 | February 24, 2022 22:15 | February 25, 2022 09:45 | 11h 30m | 1,217 | 2,678 |
| 6 | July 28, 2022 12:45 | July 28, 2022 14:30 | 1h 45m | 1,078 | 673 |
| 7 | July 2, 2022 14:15 | July 3, 2022 02:30 | 12h 15m | 1,006 | 1,049 |
| 8 | November 7, 2022 12:45 | November 7, 2022 14:45 | 2h | 949 | 239 |
| 9 | July 18, 2022 02:15 | July 18, 2022 14:30 | 12h 15m | 897 | 2,943 |
| 10 | October 24, 2022 15:15 | October 24, 2022 16:45 | 1h 30m | 819 | 410 |
Outage episodes by size in 2022: 48 reached 100+ customers, 7 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 Williamson County reported on EIA Form 861 for 2022, 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 | 2022 | 2.7 hrs | 1.02 | 1.9 hrs | 0.88 |
| Southeastern IL Elec Coop, Inc | 2022 | 2.9 hrs | 1.63 | 2.3 hrs | 1.34 |
| Ameren | - | - | - | - | - |
| Egyptian Electric Coop Assn | - | - | - | - | - |
| Southern Illinois Elec Coop | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 98% of Illinois's customers in 2022; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 35,624 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. Williamson County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Williamson County, IL annual power outage report, 2022, 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/2022/illinois/williamson-county