County annual report · FIPS 17131
2025 Mercer County, IL Power Outage Report
In 2025, customers in Mercer County, IL went without power for an average of 82.6 hours, a total of 741K customer-hours (Illinois average 2.5 hours). That ranks 1st worst of 102 Illinois counties and 40th 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 Mercer 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 | August 18, 2025 22:45 | September 10, 2025 02:30 | 22d 3h | 1,938 | 711K |
| 2 | March 20, 2025 07:15 | March 20, 2025 14:45 | 7h 30m | 1,704 | 3,500 |
| 3 | March 20, 2025 06:00 | March 20, 2025 06:30 | 30m | 1,523 | 397 |
| 4 | August 6, 2025 19:15 | August 7, 2025 08:15 | 13h | 761 | 1,867 |
| 5 | June 4, 2025 00:00 | June 5, 2025 11:15 | 1d 11h | 742 | 5,236 |
| 6 | June 28, 2025 03:45 | June 28, 2025 04:00 | 15m | 489 | 122 |
| 7 | August 16, 2025 00:15 | August 16, 2025 10:15 | 10h | 462 | 1,237 |
| 8 | May 11, 2025 05:30 | May 11, 2025 06:45 | 1h 15m | 395 | 494 |
| 9 | March 14, 2025 08:00 | March 14, 2025 10:15 | 2h 15m | 389 | 587 |
| 10 | November 26, 2025 07:15 | November 27, 2025 03:00 | 19h 45m | 352 | 2,274 |
Outage episodes by size in 2025: 26 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 Mercer 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 |
| MidAmerican Energy Co | 2024 | 5.5 hrs | 1.42 | 1.7 hrs | 0.94 |
| Ameren | - | - | - | - | - |
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 ÷ 8,972 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. Mercer County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Mercer 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/mercer-county