County annual report · FIPS 17087
2018 Johnson County, IL Power Outage Report
In 2018, customers in Johnson County, IL went without power for an average of 4.7 hours, a total of 31K customer-hours (Illinois average 2.5 hours). That ranks 21st worst of 102 Illinois counties and 1094th 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 Johnson 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 | June 29, 2018 00:45 | July 1, 2018 18:30 | 2d 17h | 2,467 | 21K |
| 2 | January 12, 2018 03:30 | January 12, 2018 11:00 | 7h 30m | 1,267 | 340 |
| 3 | November 26, 2018 06:15 | November 26, 2018 08:45 | 2h 30m | 609 | 1,394 |
| 4 | April 24, 2018 02:30 | April 24, 2018 05:15 | 2h 45m | 602 | 1,656 |
| 5 | June 26, 2018 22:30 | June 27, 2018 01:15 | 2h 45m | 345 | 583 |
| 6 | May 31, 2018 15:30 | May 31, 2018 18:45 | 3h 15m | 277 | 487 |
| 7 | February 8, 2018 23:00 | February 9, 2018 00:30 | 1h 30m | 275 | 139 |
| 8 | January 10, 2018 02:45 | January 10, 2018 07:45 | 5h | 206 | 265 |
| 9 | September 6, 2018 13:45 | September 6, 2018 14:00 | 15m | 204 | 51 |
| 10 | January 22, 2018 22:00 | January 23, 2018 16:30 | 18h 30m | 186 | 498 |
Outage episodes by size in 2018: 16 reached 100+ customers, 2 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 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 |
| Southeastern IL Elec Coop, Inc | 2018 | 10.8 hrs | 2.74 | 2.2 hrs | 1.43 |
| Ameren | - | - | - | - | - |
| Egyptian Electric Coop Assn | - | - | - | - | - |
| 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 92% of Illinois's customers in 2018; 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, 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/johnson-county