County annual report · FIPS 17081
2018 Jefferson County, IL Power Outage Report
In 2018, customers in Jefferson County, IL went without power for an average of 12.9 hours, a total of 292K customer-hours (Illinois average 2.5 hours). That ranks 4th worst of 102 Illinois counties and 429th of 2,798 nationally.
Compared with IL, the US and 2017
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Jefferson County, 2018
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | February 14, 2018 12:30 | February 14, 2018 21:15 | 8h 45m | 6,191 | 4,466 |
| 2 | August 20, 2018 02:00 | August 21, 2018 04:15 | 1d 2h | 6,056 | 14K |
| 3 | June 28, 2018 10:15 | July 2, 2018 08:00 | 3d 21h | 5,485 | 69K |
| 4 | May 14, 2018 06:30 | May 14, 2018 11:00 | 4h 30m | 5,022 | 9,421 |
| 5 | June 27, 2018 20:45 | June 28, 2018 02:15 | 5h 30m | 4,503 | 1,138 |
| 6 | June 14, 2018 21:45 | June 16, 2018 18:45 | 1d 21h | 4,081 | 26K |
| 7 | November 14, 2018 11:30 | November 14, 2018 17:15 | 5h 45m | 3,640 | 2,059 |
| 8 | April 3, 2018 08:45 | April 4, 2018 22:00 | 1d 13h | 2,809 | 5,693 |
| 9 | May 19, 2018 16:30 | May 20, 2018 10:15 | 17h 45m | 2,461 | 8,576 |
| 10 | November 9, 2018 02:15 | November 9, 2018 09:30 | 7h 15m | 2,415 | 12K |
Outage episodes by size in 2018: 101 reached 100+ customers, 26 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 2018, 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 |
| Tri-County Electric Coop, Inc (IL) | 2018 | 4.7 hrs | 1.74 | 83 min | 0.81 |
| 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 92% of Illinois's customers in 2018; 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, 2018, 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/2018/illinois/jefferson-county