County annual report · FIPS 17081
2021 Jefferson County, IL Power Outage Report
In 2021, customers in Jefferson County, IL went without power for an average of 3.7 hours, a total of 84K customer-hours (Illinois average 2.3 hours). That ranks 34th worst of 102 Illinois counties and 1623rd of 2,974 nationally.
Compared with IL, the US and 2020
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Jefferson County, 2021
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 16, 2021 12:45 | February 16, 2021 21:45 | 9h | 12,259 | 44K |
| 2 | July 5, 2021 10:45 | July 5, 2021 13:00 | 2h 15m | 6,853 | 7,039 |
| 3 | June 21, 2021 07:15 | June 21, 2021 11:15 | 4h | 3,635 | 3,936 |
| 4 | November 1, 2021 03:30 | November 1, 2021 04:15 | 45m | 2,272 | 589 |
| 5 | October 31, 2021 08:15 | October 31, 2021 13:00 | 4h 45m | 2,037 | 588 |
| 6 | October 18, 2021 19:45 | October 18, 2021 20:15 | 30m | 1,804 | 902 |
| 7 | April 7, 2021 16:00 | April 7, 2021 19:15 | 3h 15m | 1,534 | 2,175 |
| 8 | May 29, 2021 01:30 | May 29, 2021 02:15 | 45m | 864 | 648 |
| 9 | February 27, 2021 22:45 | February 28, 2021 09:15 | 10h 30m | 795 | 1,606 |
| 10 | June 15, 2021 17:30 | June 15, 2021 17:45 | 15m | 525 | 131 |
Outage episodes by size in 2021: 33 reached 100+ customers, 7 reached 1,000+ customers, 1 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 2021, 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 | 2021 | 3.2 hrs | 1.11 | 2.0 hrs | 0.88 |
| Tri-County Electric Coop, Inc (IL) | 2021 | 3.5 hrs | 1.86 | 63 min | 1.09 |
| 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 98% of Illinois's customers in 2021; 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, 2021, 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/2021/illinois/jefferson-county