County annual report · FIPS 17081
2015 Jefferson County, IL Power Outage Report
In 2015, customers in Jefferson County, IL went without power for an average of 2.5 hours, a total of 58K customer-hours (Illinois average 2.3 hours). That ranks 37th worst of 100 Illinois counties and 1045th of 2,484 nationally.
Compared with IL, the US
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Jefferson County, 2015
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | July 14, 2015 08:00 | July 15, 2015 01:00 | 17h | 3,193 | 11K |
| 2 | May 11, 2015 00:00 | May 11, 2015 16:00 | 16h | 1,652 | 11K |
| 3 | December 19, 2015 14:00 | December 19, 2015 16:45 | 2h 45m | 1,631 | 886 |
| 4 | May 11, 2015 19:15 | May 11, 2015 23:45 | 4h 30m | 1,589 | 2,445 |
| 5 | July 27, 2015 23:15 | July 28, 2015 02:30 | 3h 15m | 1,589 | 2,388 |
| 6 | July 6, 2015 23:00 | July 7, 2015 01:45 | 2h 45m | 878 | 727 |
| 7 | May 8, 2015 19:30 | May 9, 2015 07:30 | 12h | 858 | 1,481 |
| 8 | November 21, 2015 17:45 | November 22, 2015 01:00 | 7h 15m | 661 | 1,348 |
| 9 | June 26, 2015 02:45 | June 26, 2015 15:00 | 12h 15m | 656 | 2,921 |
| 10 | October 13, 2015 14:30 | October 13, 2015 20:00 | 5h 30m | 612 | 1,640 |
Outage episodes by size in 2015: 34 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 2015, 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 | 2015 | 5.9 hrs | 1.39 | 2.2 hrs | 1.04 |
| Tri-County Electric Coop, Inc (IL) | 2015 | 2.7 hrs | 2.00 | 2.0 hrs | 1.50 |
| 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 2015; 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, 2015, 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/2015/illinois/jefferson-county