County annual report · FIPS 17087
2023 Johnson County, IL Power Outage Report
In 2023, customers in Johnson County, IL went without power for an average of 3.1 hours, a total of 20K customer-hours (Illinois average 4.0 hours). That ranks 63rd worst of 102 Illinois counties and 1924th of 2,977 nationally.
Compared with IL, the US and 2022
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Johnson County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | January 25, 2023 05:30 | January 25, 2023 18:30 | 13h | 1,265 | 5,634 |
| 2 | January 3, 2023 08:45 | January 3, 2023 13:15 | 4h 30m | 1,247 | 2,836 |
| 3 | April 10, 2023 12:15 | April 10, 2023 12:45 | 30m | 1,241 | 324 |
| 4 | May 20, 2023 02:45 | May 20, 2023 03:15 | 30m | 1,241 | 316 |
| 5 | March 3, 2023 19:45 | March 4, 2023 06:30 | 10h 45m | 460 | 952 |
| 6 | July 29, 2023 23:00 | July 30, 2023 13:15 | 14h 15m | 393 | 1,313 |
| 7 | July 1, 2023 22:45 | July 5, 2023 00:30 | 3d 1h | 308 | 1,841 |
| 8 | February 28, 2023 10:45 | February 28, 2023 16:15 | 5h 30m | 266 | 780 |
| 9 | June 10, 2023 15:15 | June 10, 2023 20:30 | 5h 15m | 266 | 1,260 |
| 10 | July 22, 2023 20:45 | July 22, 2023 23:15 | 2h 30m | 265 | 583 |
Outage episodes by size in 2023: 17 reached 100+ customers, 4 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 Johnson County reported on EIA Form 861 for 2023, 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 | 2023 | 9.9 hrs | 1.33 | 1.9 hrs | 0.82 |
| Egyptian Electric Coop Assn | 2023 | 4.4 hrs | - | - | - |
| Southeastern IL Elec Coop, Inc | 2023 | 3.4 hrs | 1.80 | 2.3 hrs | 1.37 |
| Ameren | - | - | - | - | - |
| 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 2023; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 6,500 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. Johnson County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Johnson County, IL annual power outage report, 2023, 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/2023/illinois/johnson-county