County annual report · FIPS 17097
2021 Lake County, IL Power Outage Report
In 2021, customers in Lake County, IL went without power for an average of 2.0 hours, a total of 1.1M customer-hours (Illinois average 2.3 hours). That ranks 69th worst of 102 Illinois counties and 2235th 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 Lake 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 10, 2021 16:45 | August 14, 2021 06:15 | 3d 13h | 42,379 | 765K |
| 2 | September 7, 2021 09:15 | September 9, 2021 06:45 | 1d 21h | 8,553 | 53K |
| 3 | December 15, 2021 14:15 | December 17, 2021 03:45 | 1d 13h | 6,640 | 39K |
| 4 | June 4, 2021 04:15 | June 5, 2021 06:30 | 1d 2h | 5,046 | 3,276 |
| 5 | October 24, 2021 21:45 | October 27, 2021 01:00 | 2d 3h | 4,281 | 44K |
| 6 | August 8, 2021 20:30 | August 9, 2021 07:15 | 10h 45m | 4,277 | 14K |
| 7 | July 29, 2021 07:30 | July 30, 2021 21:15 | 1d 13h | 3,943 | 28K |
| 8 | June 18, 2021 09:45 | June 19, 2021 07:15 | 21h 30m | 3,882 | 17K |
| 9 | June 23, 2021 08:00 | June 25, 2021 06:45 | 1d 22h | 2,699 | 4,350 |
| 10 | May 27, 2021 13:30 | May 28, 2021 00:15 | 10h 45m | 2,279 | 838 |
Outage episodes by size in 2021: 220 reached 100+ customers, 27 reached 1,000+ customers, 1 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 Lake 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 |
|---|---|---|---|---|---|
| Commonwealth Edison Co | 2021 | 1.7 hrs | 0.77 | 43 min | 0.59 |
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 ÷ 581,008 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. Lake County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Lake 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/lake-county