County annual report · FIPS 17199
2016 Williamson County, IL Power Outage Report
In 2016, customers in Williamson County, IL went without power for an average of 1.5 hours, a total of 53K customer-hours (Illinois average 1.5 hours). That ranks 61st worst of 100 Illinois counties and 1540th of 2,391 nationally.
Compared with IL, the US and 2015
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Williamson County, 2016
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 12, 2016 00:30 | May 12, 2016 10:00 | 9h 30m | 5,019 | 11K |
| 2 | September 22, 2016 10:45 | September 22, 2016 20:15 | 9h 30m | 3,649 | 5,545 |
| 3 | July 8, 2016 20:30 | July 9, 2016 00:45 | 4h 15m | 3,421 | 2,012 |
| 4 | April 21, 2016 06:00 | April 22, 2016 13:45 | 1d 7h | 2,949 | 10K |
| 5 | September 15, 2016 12:30 | September 16, 2016 14:15 | 1d 1h | 2,823 | 2,590 |
| 6 | March 8, 2016 19:00 | March 8, 2016 19:15 | 15m | 1,066 | 267 |
| 7 | December 16, 2016 17:30 | December 16, 2016 20:30 | 3h | 810 | 1,624 |
| 8 | July 6, 2016 16:00 | July 8, 2016 15:00 | 1d 23h | 687 | 1,193 |
| 9 | March 7, 2016 19:00 | March 8, 2016 04:15 | 9h 15m | 629 | 777 |
| 10 | August 13, 2016 14:00 | August 13, 2016 17:45 | 3h 45m | 559 | 731 |
Outage episodes by size in 2016: 26 reached 100+ customers, 6 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 2016, 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 | 2016 | 4.0 hrs | 1.36 | 2.1 hrs | 1.04 |
| Southeastern IL Elec Coop, Inc | 2016 | 2.6 hrs | 1.43 | 2.4 hrs | 1.37 |
| 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 n/a of Illinois's customers in 2016; 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, 2016, 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/2016/illinois/williamson-county