County annual report · FIPS 17111
2024 McHenry County, IL Power Outage Report
In 2024, customers in McHenry County, IL went without power for an average of 1.7 hours, a total of 203K customer-hours (Illinois average 3.0 hours). That ranks 84th worst of 102 Illinois counties and 2504th of 2,990 nationally.
Compared with IL, the US and 2023
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in McHenry County, 2024
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 23, 2024 02:00 | June 24, 2024 02:00 | 1d | 4,149 | 31K |
| 2 | August 27, 2024 18:45 | August 28, 2024 22:15 | 1d 3h | 3,388 | 12K |
| 3 | May 21, 2024 21:00 | May 23, 2024 04:00 | 1d 7h | 2,817 | 18K |
| 4 | July 30, 2024 18:45 | July 31, 2024 02:45 | 8h | 2,327 | 3,444 |
| 5 | August 6, 2024 08:45 | August 7, 2024 03:30 | 18h 45m | 2,212 | 5,876 |
| 6 | July 15, 2024 03:45 | July 19, 2024 23:45 | 4d 20h | 1,916 | 27K |
| 7 | May 4, 2024 23:00 | May 5, 2024 15:30 | 16h 30m | 1,669 | 7,680 |
| 8 | June 6, 2024 12:45 | June 7, 2024 02:00 | 13h 15m | 1,384 | 2,035 |
| 9 | August 1, 2024 12:00 | August 2, 2024 05:45 | 17h 45m | 1,001 | 3,585 |
| 10 | June 16, 2024 17:30 | June 17, 2024 05:15 | 11h 45m | 999 | 2,009 |
Outage episodes by size in 2024: 118 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 McHenry County reported on EIA Form 861 for 2024, 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 |
| Rock Energy Cooperative | 2024 | 53 min | 0.48 | 27 min | 0.36 |
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 2024; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 120,381 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. McHenry County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), McHenry County, IL annual power outage report, 2024, 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/2024/illinois/mchenry-county