County annual report · FIPS 17099
2021 LaSalle County, IL Power Outage Report
In 2021, customers in LaSalle County, IL went without power for an average of 3.4 hours, a total of 214K customer-hours (Illinois average 2.3 hours). That ranks 40th worst of 102 Illinois counties and 1709th of 2,974 nationally.
Compared with IL, the US and 2020
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in LaSalle County, 2021
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 11, 2021 00:15 | August 14, 2021 03:00 | 3d 2h | 9,828 | 122K |
| 2 | May 20, 2021 22:45 | May 21, 2021 03:00 | 4h 15m | 3,839 | 4,548 |
| 3 | November 3, 2021 00:45 | November 3, 2021 07:30 | 6h 45m | 2,115 | 4,548 |
| 4 | June 16, 2021 14:15 | June 16, 2021 14:30 | 15m | 1,999 | 500 |
| 5 | September 7, 2021 18:15 | September 9, 2021 11:45 | 1d 17h | 1,785 | 5,115 |
| 6 | December 15, 2021 22:45 | December 17, 2021 15:45 | 1d 17h | 1,632 | 6,970 |
| 7 | August 30, 2021 13:30 | August 30, 2021 20:30 | 7h | 1,607 | 1,359 |
| 8 | August 9, 2021 20:15 | August 10, 2021 17:30 | 21h 15m | 1,089 | 3,245 |
| 9 | December 6, 2021 18:45 | December 7, 2021 02:00 | 7h 15m | 1,022 | 2,049 |
| 10 | January 30, 2021 22:15 | February 1, 2021 02:00 | 1d 3h | 928 | 982 |
Outage episodes by size in 2021: 64 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 2021, 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 | 2021 | 3.2 hrs | 1.11 | 2.0 hrs | 0.88 |
| Commonwealth Edison Co | 2021 | 1.7 hrs | 0.77 | 43 min | 0.59 |
| Corn Belt Energy Corporation | 2021 | 12.3 hrs | 6.64 | 3.7 hrs | 4.71 |
| 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 98% of Illinois's customers in 2021; 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, 2021, 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/2021/illinois/lasalle-county