County annual report · FIPS 17087
2015 Johnson County, IL Power Outage Report
In 2015, customers in Johnson County, IL went without power for an average of 0.9 hours, a total of 5,986 customer-hours (Illinois average 2.3 hours). That ranks 80th worst of 100 Illinois counties and 1812th 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 Johnson 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 | May 6, 2015 07:15 | May 6, 2015 07:45 | 30m | 1,274 | 344 |
| 2 | November 27, 2015 14:30 | November 27, 2015 15:00 | 30m | 973 | 484 |
| 3 | November 27, 2015 15:45 | November 27, 2015 16:00 | 15m | 956 | 239 |
| 4 | June 12, 2015 17:00 | June 12, 2015 18:00 | 1h | 605 | 235 |
| 5 | June 12, 2015 23:45 | June 13, 2015 04:45 | 5h | 287 | 1,241 |
| 6 | August 3, 2015 14:00 | August 3, 2015 14:30 | 30m | 286 | 143 |
| 7 | May 29, 2015 08:15 | May 29, 2015 11:45 | 3h 30m | 188 | 237 |
| 8 | January 9, 2015 01:00 | January 9, 2015 03:00 | 2h | 164 | 205 |
| 9 | May 2, 2015 19:00 | May 2, 2015 21:00 | 2h | 164 | 252 |
| 10 | June 19, 2015 21:30 | June 20, 2015 00:00 | 2h 30m | 154 | 249 |
Outage episodes by size in 2015: 13 reached 100+ customers, 1 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 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 |
| Southeastern IL Elec Coop, Inc | 2015 | 2.9 hrs | 1.58 | 2.7 hrs | 1.51 |
| 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 n/a of Illinois's customers in 2015; 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, 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/johnson-county