County annual report · FIPS 17181
2025 Union County, IL Power Outage Report
In 2025, customers in Union County, IL went without power for an average of 10.0 hours, a total of 103K customer-hours (Illinois average 2.5 hours). That ranks 16th worst of 102 Illinois counties and 798th 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 Union 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 | March 13, 2025 12:45 | March 13, 2025 13:45 | 1h | 4,735 | 3,557 |
| 2 | April 2, 2025 23:30 | April 3, 2025 22:30 | 23h | 4,731 | 8,983 |
| 3 | September 14, 2025 23:45 | September 15, 2025 02:30 | 2h 45m | 4,694 | 6,675 |
| 4 | January 5, 2025 15:15 | January 9, 2025 00:00 | 3d 8h | 2,478 | 61K |
| 5 | March 15, 2025 05:45 | March 15, 2025 22:30 | 16h 45m | 1,764 | 8,342 |
| 6 | May 20, 2025 06:15 | May 20, 2025 16:15 | 10h | 1,732 | 5,109 |
| 7 | September 25, 2025 14:15 | September 25, 2025 19:45 | 5h 30m | 501 | 249 |
| 8 | February 12, 2025 22:00 | February 13, 2025 02:15 | 4h 15m | 460 | 529 |
| 9 | April 20, 2025 21:30 | April 21, 2025 10:00 | 12h 30m | 375 | 1,018 |
| 10 | April 29, 2025 22:15 | April 29, 2025 22:45 | 30m | 362 | 181 |
Outage episodes by size in 2025: 14 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 Union 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 | - | - | - |
| 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 ÷ 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, 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/union-county