County annual report · FIPS 17199
2024 Williamson County, IL Power Outage Report
In 2024, customers in Williamson County, IL went without power for an average of 4.1 hours, a total of 146K customer-hours (Illinois average 3.0 hours). That ranks 41st worst of 102 Illinois counties and 1821st of 2,990 nationally.
Compared with IL, the US and 2023
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Williamson County, 2024
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 26, 2024 20:30 | May 29, 2024 03:00 | 2d 6h | 8,670 | 69K |
| 2 | July 5, 2024 07:15 | July 6, 2024 02:30 | 19h 15m | 4,810 | 18K |
| 3 | June 25, 2024 23:00 | June 26, 2024 09:30 | 10h 30m | 2,832 | 4,736 |
| 4 | November 1, 2024 16:45 | November 1, 2024 21:15 | 4h 30m | 2,734 | 2,276 |
| 5 | November 1, 2024 14:15 | November 1, 2024 15:45 | 1h 30m | 2,730 | 1,648 |
| 6 | April 2, 2024 10:00 | April 3, 2024 19:15 | 1d 9h | 1,738 | 12K |
| 7 | March 7, 2024 16:45 | March 7, 2024 18:00 | 1h 15m | 1,108 | 280 |
| 8 | June 22, 2024 20:15 | June 23, 2024 00:00 | 3h 45m | 1,051 | 819 |
| 9 | June 13, 2024 19:45 | June 13, 2024 21:15 | 1h 30m | 649 | 244 |
| 10 | September 13, 2024 04:45 | September 13, 2024 13:00 | 8h 15m | 590 | 4,398 |
Outage episodes by size in 2024: 45 reached 100+ customers, 8 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 2024, 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 |
| Egyptian Electric Coop Assn | 2024 | 2.1 hrs | - | - | - |
| Southeastern IL Elec Coop, Inc | 2024 | 10.0 hrs | 3.07 | 2.3 hrs | 1.50 |
| 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 2024; 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, 2024, 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/2024/illinois/williamson-county