County annual report · FIPS 17087
2025 Johnson County, IL Power Outage Report
In 2025, customers in Johnson County, IL went without power for an average of 12.3 hours, a total of 80K customer-hours (Illinois average 2.5 hours). That ranks 10th worst of 102 Illinois counties and 632nd 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 Johnson 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 14, 2025 08:00 | April 14, 2025 09:45 | 1h 45m | 1,424 | 1,333 |
| 2 | March 15, 2025 06:15 | March 16, 2025 18:30 | 1d 12h | 1,322 | 8,348 |
| 3 | March 30, 2025 23:45 | March 31, 2025 04:30 | 4h 45m | 1,264 | 487 |
| 4 | April 4, 2025 07:15 | April 4, 2025 10:15 | 3h | 1,255 | 352 |
| 5 | July 10, 2025 23:45 | July 11, 2025 00:30 | 45m | 1,251 | 586 |
| 6 | January 5, 2025 16:45 | January 12, 2025 22:15 | 7d 5h | 1,055 | 44K |
| 7 | December 30, 2025 14:15 | December 30, 2025 14:30 | 15m | 848 | 212 |
| 8 | March 4, 2025 23:00 | March 5, 2025 16:15 | 17h 15m | 837 | 7,287 |
| 9 | May 16, 2025 23:15 | May 18, 2025 17:30 | 1d 18h | 671 | 9,766 |
| 10 | August 12, 2025 15:00 | August 12, 2025 21:00 | 6h | 498 | 143 |
Outage episodes by size in 2025: 22 reached 100+ customers, 6 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 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 |
| Egyptian Electric Coop Assn | 2024 | 2.1 hrs | - | - | - |
| Southeastern IL Elec Coop, Inc | 2024 | 10.0 hrs | 3.07 | 2.3 hrs | 1.50 |
| 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 2025; 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, 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/johnson-county