County annual report · FIPS 17199
2023 Williamson County, IL Power Outage Report
In 2023, customers in Williamson County, IL went without power for an average of 2.0 hours, a total of 70K customer-hours (Illinois average 4.0 hours). That ranks 84th worst of 102 Illinois counties and 2305th 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 Williamson 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 | July 29, 2023 22:45 | August 1, 2023 16:15 | 2d 17h | 4,280 | 17K |
| 2 | May 7, 2023 19:15 | May 8, 2023 07:15 | 12h | 2,928 | 8,456 |
| 3 | March 24, 2023 03:30 | March 24, 2023 17:45 | 14h 15m | 1,288 | 8,666 |
| 4 | February 27, 2023 11:15 | February 28, 2023 06:15 | 19h | 1,218 | 3,406 |
| 5 | July 1, 2023 23:00 | July 3, 2023 15:00 | 1d 16h | 842 | 3,925 |
| 6 | March 3, 2023 19:45 | March 4, 2023 20:45 | 1d 1h | 651 | 966 |
| 7 | March 8, 2023 13:30 | March 8, 2023 20:15 | 6h 45m | 596 | 170 |
| 8 | July 19, 2023 09:00 | July 19, 2023 22:30 | 13h 30m | 545 | 1,192 |
| 9 | November 23, 2023 09:45 | November 23, 2023 19:45 | 10h | 488 | 1,424 |
| 10 | July 16, 2023 22:45 | July 17, 2023 11:45 | 13h | 428 | 2,009 |
Outage episodes by size in 2023: 32 reached 100+ customers, 4 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 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 |
| Egyptian Electric Coop Assn | 2023 | 4.4 hrs | - | - | - |
| Southeastern IL Elec Coop, Inc | 2023 | 3.4 hrs | 1.80 | 2.3 hrs | 1.37 |
| Ameren | - | - | - | - | - |
| 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 n/a of Illinois's customers in 2023; 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, 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/williamson-county