County annual report · FIPS 17099
2025 LaSalle County, IL Power Outage Report
In 2025, customers in LaSalle County, IL went without power for an average of 2.2 hours, a total of 139K customer-hours (Illinois average 2.5 hours). That ranks 70th worst of 102 Illinois counties and 2345th 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 LaSalle 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 12, 2025 13:45 | March 12, 2025 16:15 | 2h 30m | 6,369 | 3,268 |
| 2 | August 12, 2025 01:00 | August 13, 2025 04:45 | 1d 3h | 4,207 | 30K |
| 3 | September 29, 2025 21:45 | September 30, 2025 00:30 | 2h 45m | 3,369 | 1,852 |
| 4 | March 20, 2025 07:15 | March 20, 2025 20:30 | 13h 15m | 2,660 | 7,120 |
| 5 | July 24, 2025 19:00 | July 25, 2025 12:30 | 17h 30m | 2,604 | 6,713 |
| 6 | May 1, 2025 20:00 | May 1, 2025 21:00 | 1h | 2,112 | 2,112 |
| 7 | January 4, 2025 22:45 | January 5, 2025 06:15 | 7h 30m | 2,057 | 15K |
| 8 | April 24, 2025 17:00 | April 24, 2025 18:00 | 1h | 1,437 | 362 |
| 9 | May 19, 2025 19:00 | May 20, 2025 01:15 | 6h 15m | 1,152 | 2,428 |
| 10 | April 24, 2025 19:00 | April 25, 2025 01:45 | 6h 45m | 850 | 2,860 |
Outage episodes by size in 2025: 77 reached 100+ customers, 9 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 LaSalle 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 |
| Commonwealth Edison Co | 2024 | 2.2 hrs | 0.68 | 36 min | 0.49 |
| Corn Belt Energy Corporation | 2024 | 5.2 hrs | 5.21 | 2.5 hrs | 4.68 |
| Ameren | - | - | - | - | - |
| City of Oglesby - (IL) | - | - | - | - | - |
| City of Peru - (IL) | - | - | - | - | - |
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 ÷ 63,017 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. LaSalle County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), LaSalle 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/lasalle-county