County annual report · FIPS 17135
2025 Montgomery County, IL Power Outage Report
In 2025, customers in Montgomery County, IL went without power for an average of 4.3 hours, a total of 45K customer-hours (Illinois average 2.5 hours). That ranks 41st worst of 102 Illinois counties and 1679th 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 Montgomery 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 | November 19, 2025 16:30 | November 19, 2025 17:30 | 1h | 1,063 | 1,063 |
| 2 | July 12, 2025 01:00 | July 14, 2025 16:45 | 2d 15h | 1,039 | 1,257 |
| 3 | July 3, 2025 18:15 | July 6, 2025 18:00 | 2d 23h | 856 | 2,479 |
| 4 | July 31, 2025 07:15 | July 31, 2025 09:15 | 2h | 567 | 782 |
| 5 | May 16, 2025 19:15 | May 18, 2025 01:30 | 1d 6h | 510 | 6,408 |
| 6 | July 18, 2025 14:15 | July 18, 2025 19:00 | 4h 45m | 400 | 281 |
| 7 | July 18, 2025 02:45 | July 18, 2025 13:15 | 10h 30m | 398 | 408 |
| 8 | July 20, 2025 15:30 | July 21, 2025 16:00 | 1d | 398 | 1,196 |
| 9 | July 17, 2025 08:15 | July 17, 2025 20:45 | 12h 30m | 332 | 449 |
| 10 | September 24, 2025 02:15 | September 24, 2025 11:15 | 9h | 301 | 873 |
Outage episodes by size in 2025: 27 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 Montgomery 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 |
| Southwestern Electric Coop Inc - (IL) | 2024 | 5.1 hrs | 2.21 | 4.4 hrs | 1.78 |
| Rural Electric Conven Coop | 2018 | 4.0 hrs | 1.91 | 2.0 hrs | 1.84 |
| Ameren | - | - | - | - | - |
| Shelby Electric Coop, Inc | - | - | - | - | - |
| M J M Electric Cooperative Inc | - | - | - | - | - |
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 ÷ 10,344 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. Montgomery County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Montgomery 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/montgomery-county