County annual report · FIPS 17199
2017 Williamson County, IL Power Outage Report
In 2017, customers in Williamson County, IL went without power for an average of 1.4 hours, a total of 49K customer-hours (Illinois average 1.4 hours). That ranks 42nd worst of 102 Illinois counties and 1880th of 2,786 nationally.
Compared with IL, the US and 2016
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Williamson County, 2017
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | April 26, 2017 21:45 | April 27, 2017 00:45 | 3h | 4,647 | 8,150 |
| 2 | January 17, 2017 03:45 | January 17, 2017 12:30 | 8h 45m | 1,783 | 7,795 |
| 3 | March 25, 2017 17:00 | March 26, 2017 02:00 | 9h | 1,206 | 4,222 |
| 4 | June 6, 2017 05:00 | June 6, 2017 07:15 | 2h 15m | 1,194 | 2,466 |
| 5 | August 21, 2017 23:00 | August 22, 2017 00:00 | 1h | 1,107 | 830 |
| 6 | November 3, 2017 06:00 | November 3, 2017 17:45 | 11h 45m | 872 | 2,884 |
| 7 | April 29, 2017 04:00 | April 30, 2017 23:30 | 1d 19h | 784 | 3,994 |
| 8 | July 21, 2017 09:00 | July 21, 2017 13:00 | 4h | 773 | 1,475 |
| 9 | January 13, 2017 16:45 | January 14, 2017 05:00 | 12h 15m | 622 | 3,392 |
| 10 | March 1, 2017 10:15 | March 2, 2017 07:30 | 21h 15m | 605 | 823 |
Outage episodes by size in 2017: 28 reached 100+ customers, 5 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 2017, 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 | 2017 | 3.2 hrs | 1.12 | 2.0 hrs | 0.90 |
| Southeastern IL Elec Coop, Inc | 2017 | 5.3 hrs | 2.21 | 2.2 hrs | 1.51 |
| 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 2017; 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, 2017, 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/2017/illinois/williamson-county