County annual report · FIPS 17081
2025 Jefferson County, IL Power Outage Report
In 2025, customers in Jefferson County, IL went without power for an average of 2.2 hours, a total of 49K customer-hours (Illinois average 2.5 hours). That ranks 72nd worst of 102 Illinois counties and 2359th of 3,000 nationally.
Compared with IL, the US and 2024
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Jefferson County, 2025
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 29, 2025 19:30 | April 30, 2025 19:15 | 23h 45m | 1,540 | 2,548 |
| 2 | October 19, 2025 18:30 | October 20, 2025 02:00 | 7h 30m | 1,519 | 2,939 |
| 3 | November 14, 2025 10:15 | November 14, 2025 11:45 | 1h 30m | 1,513 | 2,269 |
| 4 | July 31, 2025 19:30 | July 31, 2025 23:15 | 3h 45m | 1,455 | 2,074 |
| 5 | March 14, 2025 20:15 | March 17, 2025 22:00 | 3d 1h | 1,078 | 8,569 |
| 6 | June 5, 2025 00:15 | June 5, 2025 09:30 | 9h 15m | 903 | 1,268 |
| 7 | July 24, 2025 19:30 | July 24, 2025 22:15 | 2h 45m | 885 | 888 |
| 8 | July 19, 2025 17:45 | July 20, 2025 06:30 | 12h 45m | 678 | 535 |
| 9 | July 18, 2025 05:30 | July 18, 2025 10:30 | 5h | 653 | 2,691 |
| 10 | February 10, 2025 10:45 | February 10, 2025 14:00 | 3h 15m | 544 | 211 |
Outage episodes by size in 2025: 36 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 Jefferson County reported on EIA Form 861 for 2025, 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 |
| Tri-County Electric Coop, Inc (IL) | 2024 | 6.2 hrs | 2.50 | 64 min | 0.73 |
| Ameren | - | - | - | - | - |
| Wayne-White Counties 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 2025; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 22,670 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. Jefferson County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Jefferson County, IL annual power outage report, 2025, 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/2025/illinois/jefferson-county