County annual report · FIPS 17181
2018 Union County, IL Power Outage Report
In 2018, customers in Union County, IL went without power for an average of 3.7 hours, a total of 38K customer-hours (Illinois average 2.5 hours). That ranks 33rd worst of 102 Illinois counties and 1318th 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 Union 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 | February 25, 2018 00:00 | February 25, 2018 01:45 | 1h 45m | 4,715 | 4,842 |
| 2 | June 26, 2018 21:30 | June 26, 2018 23:30 | 2h | 4,674 | 4,147 |
| 3 | June 28, 2018 23:00 | July 1, 2018 01:00 | 2d 2h | 4,345 | 17K |
| 4 | April 13, 2018 13:45 | April 14, 2018 00:15 | 10h 30m | 858 | 748 |
| 5 | May 19, 2018 22:15 | May 20, 2018 18:00 | 19h 45m | 550 | 2,933 |
| 6 | March 22, 2018 14:15 | March 22, 2018 16:15 | 2h | 460 | 127 |
| 7 | May 4, 2018 21:15 | May 4, 2018 22:45 | 1h 30m | 361 | 521 |
| 8 | September 22, 2018 18:30 | September 23, 2018 07:30 | 13h | 354 | 546 |
| 9 | January 31, 2018 02:45 | January 31, 2018 11:15 | 8h 30m | 353 | 2,643 |
| 10 | June 25, 2018 14:30 | June 25, 2018 21:30 | 7h | 351 | 1,405 |
Outage episodes by size in 2018: 12 reached 100+ customers, 3 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 Union 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 |
| 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 ÷ 10,277 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. Union County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Union 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/union-county