County annual report · FIPS 17111
2019 McHenry County, IL Power Outage Report
In 2019, customers in McHenry County, IL went without power for an average of 3.0 hours, a total of 362K customer-hours (Illinois average 1.8 hours). That ranks 43rd worst of 102 Illinois counties and 1640th of 2,945 nationally.
Compared with IL, the US and 2018
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in McHenry County, 2019
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 30, 2019 18:30 | July 4, 2019 08:00 | 3d 13h | 10,378 | 129K |
| 2 | February 6, 2019 01:30 | February 8, 2019 19:30 | 2d 18h | 4,888 | 42K |
| 3 | June 24, 2019 22:00 | June 25, 2019 18:30 | 20h 30m | 2,560 | 5,399 |
| 4 | July 20, 2019 19:30 | July 22, 2019 02:00 | 1d 6h | 2,353 | 8,011 |
| 5 | January 30, 2019 06:00 | January 31, 2019 00:30 | 18h 30m | 2,172 | 6,847 |
| 6 | August 18, 2019 13:30 | August 19, 2019 08:30 | 19h | 2,164 | 9,424 |
| 7 | August 8, 2019 06:00 | August 9, 2019 03:00 | 21h | 1,906 | 12K |
| 8 | September 12, 2019 00:30 | September 14, 2019 07:30 | 2d 7h | 1,844 | 24K |
| 9 | November 27, 2019 11:00 | November 28, 2019 11:45 | 1d | 1,810 | 6,100 |
| 10 | January 8, 2019 18:30 | January 9, 2019 03:30 | 9h | 1,698 | 1,315 |
Outage episodes by size in 2019: 138 reached 100+ customers, 19 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 McHenry County reported on EIA Form 861 for 2019, 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 | 2018 | 2.0 hrs | 0.82 | 58 min | 0.70 |
| Rock Energy Cooperative | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 99% of Illinois's customers in 2019; 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, 2019, 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/2019/illinois/mchenry-county