County annual report · FIPS 17111
2017 McHenry County, IL Power Outage Report
In 2017, customers in McHenry County, IL went without power for an average of 2.7 hours, a total of 325K customer-hours (Illinois average 1.4 hours). That ranks 18th worst of 102 Illinois counties and 1418th of 2,786 nationally.
Compared with IL, the US and 2016
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in McHenry County, 2017
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 6, 2017 14:30 | November 7, 2017 03:30 | 13h | 10,546 | 11K |
| 2 | July 12, 2017 04:30 | July 13, 2017 22:00 | 1d 17h | 4,460 | 42K |
| 3 | July 20, 2017 03:00 | July 25, 2017 06:30 | 5d 3h | 4,220 | 68K |
| 4 | March 8, 2017 15:00 | March 10, 2017 03:30 | 1d 12h | 3,292 | 26K |
| 5 | June 13, 2017 16:00 | June 13, 2017 19:30 | 3h 30m | 3,036 | 2,140 |
| 6 | June 17, 2017 10:00 | June 19, 2017 05:30 | 1d 19h | 2,576 | 12K |
| 7 | June 14, 2017 11:30 | June 17, 2017 01:30 | 2d 14h | 2,344 | 18K |
| 8 | March 13, 2017 12:00 | March 13, 2017 17:30 | 5h 30m | 2,318 | 1,657 |
| 9 | May 20, 2017 10:00 | May 20, 2017 19:00 | 9h | 2,105 | 10K |
| 10 | May 17, 2017 20:00 | May 20, 2017 03:30 | 2d 7h | 2,036 | 17K |
Outage episodes by size in 2017: 115 reached 100+ customers, 13 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 2017, 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 | 2017 | 1.6 hrs | 0.82 | 55 min | 0.66 |
| 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 n/a of Illinois's customers in 2017; 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, 2017, 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/2017/illinois/mchenry-county