County annual report · FIPS 17097
2025 Lake County, IL Power Outage Report
In 2025, customers in Lake County, IL went without power for an average of 0.5 hours, a total of 268K customer-hours (Illinois average 2.5 hours). That ranks 102nd worst of 102 Illinois counties and 2881st 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 Lake 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 | August 16, 2025 19:45 | August 20, 2025 01:45 | 3d 6h | 8,580 | 80K |
| 2 | March 6, 2025 08:15 | March 6, 2025 08:30 | 15m | 4,390 | 1,098 |
| 3 | June 29, 2025 19:45 | July 1, 2025 03:15 | 1d 7h | 2,542 | 7,387 |
| 4 | May 15, 2025 13:45 | May 18, 2025 00:00 | 2d 10h | 2,335 | 15K |
| 5 | March 15, 2025 04:45 | March 16, 2025 03:30 | 22h 45m | 2,171 | 7,546 |
| 6 | August 9, 2025 14:15 | August 10, 2025 10:30 | 20h 15m | 2,067 | 2,433 |
| 7 | August 11, 2025 11:45 | August 12, 2025 00:30 | 12h 45m | 1,936 | 2,200 |
| 8 | June 17, 2025 22:45 | June 18, 2025 18:15 | 19h 30m | 1,692 | 4,034 |
| 9 | November 26, 2025 06:45 | November 27, 2025 04:00 | 21h 15m | 1,487 | 5,925 |
| 10 | June 21, 2025 16:15 | June 22, 2025 20:15 | 1d 4h | 1,471 | 6,025 |
Outage episodes by size in 2025: 197 reached 100+ customers, 15 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 Lake 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 |
|---|---|---|---|---|---|
| Commonwealth Edison Co | 2024 | 2.2 hrs | 0.68 | 36 min | 0.49 |
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 ÷ 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, 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/lake-county