County annual report · FIPS 17099
2018 LaSalle County, IL Power Outage Report
In 2018, customers in LaSalle County, IL went without power for an average of 3.8 hours, a total of 238K customer-hours (Illinois average 2.5 hours). That ranks 31st worst of 102 Illinois counties and 1304th of 2,798 nationally.
Compared with IL, the US and 2017
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in LaSalle County, 2018
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 25, 2018 22:00 | November 30, 2018 11:30 | 4d 13h | 5,602 | 125K |
| 2 | October 20, 2018 17:45 | October 22, 2018 10:00 | 1d 16h | 2,946 | 22K |
| 3 | April 27, 2018 19:00 | April 28, 2018 06:00 | 11h | 2,843 | 4,295 |
| 4 | November 15, 2018 14:45 | November 15, 2018 19:00 | 4h 15m | 2,080 | 2,019 |
| 5 | June 20, 2018 18:00 | June 20, 2018 23:00 | 5h | 2,055 | 2,488 |
| 6 | September 8, 2018 19:00 | September 9, 2018 03:00 | 8h | 1,762 | 1,361 |
| 7 | June 8, 2018 11:30 | June 8, 2018 21:30 | 10h | 1,715 | 1,869 |
| 8 | May 15, 2018 01:15 | May 15, 2018 12:00 | 10h 45m | 1,225 | 2,199 |
| 9 | August 24, 2018 15:00 | August 24, 2018 23:00 | 8h | 1,127 | 3,909 |
| 10 | September 15, 2018 04:00 | September 15, 2018 04:30 | 30m | 1,119 | 560 |
Outage episodes by size in 2018: 77 reached 100+ customers, 10 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 2018, 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 | 2018 | 3.5 hrs | 1.06 | 1.8 hrs | 0.90 |
| Commonwealth Edison Co | 2018 | 2.0 hrs | 0.82 | 58 min | 0.70 |
| Corn Belt Energy Corporation | 2018 | 6.9 hrs | 4.02 | 3.3 hrs | 3.75 |
| 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 92% of Illinois's customers in 2018; 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, 2018, 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/2018/illinois/lasalle-county