County annual report · FIPS 17199
2019 Williamson County, IL Power Outage Report
In 2019, customers in Williamson County, IL went without power for an average of 3.5 hours, a total of 126K customer-hours (Illinois average 1.8 hours). That ranks 35th worst of 102 Illinois counties and 1449th of 2,945 nationally.
Compared with IL, the US and 2018
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Williamson County, 2019
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | March 24, 2019 02:00 | March 24, 2019 05:45 | 3h 45m | 7,719 | 12K |
| 2 | June 21, 2019 20:15 | June 22, 2019 16:15 | 20h | 6,568 | 16K |
| 3 | January 30, 2019 12:45 | January 31, 2019 20:15 | 1d 7h | 6,525 | 46K |
| 4 | March 14, 2019 16:45 | March 15, 2019 09:45 | 17h | 2,296 | 5,513 |
| 5 | February 21, 2019 13:45 | February 21, 2019 20:00 | 6h 15m | 1,642 | 417 |
| 6 | October 12, 2019 03:00 | October 15, 2019 14:45 | 3d 11h | 1,629 | 2,509 |
| 7 | September 12, 2019 13:00 | September 13, 2019 01:15 | 12h 15m | 1,272 | 2,883 |
| 8 | August 2, 2019 12:15 | August 2, 2019 19:00 | 6h 45m | 1,229 | 322 |
| 9 | May 24, 2019 01:45 | May 24, 2019 08:00 | 6h 15m | 727 | 558 |
| 10 | November 22, 2019 02:45 | November 22, 2019 08:00 | 5h 15m | 709 | 3,361 |
Outage episodes by size in 2019: 47 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 2019, 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 | 2018 | 3.5 hrs | 1.06 | 1.8 hrs | 0.90 |
| Southeastern IL Elec Coop, Inc | 2018 | 10.8 hrs | 2.74 | 2.2 hrs | 1.43 |
| 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 99% of Illinois's customers in 2019; 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, 2019, 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/2019/illinois/williamson-county