County annual report · FIPS 17111
2015 McHenry County, IL Power Outage Report
In 2015, customers in McHenry County, IL went without power for an average of 2.0 hours, a total of 247K customer-hours (Illinois average 2.3 hours). That ranks 48th worst of 100 Illinois counties and 1217th of 2,484 nationally.
Compared with IL, the US
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in McHenry County, 2015
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 8, 2015 19:15 | June 9, 2015 04:00 | 8h 45m | 16,151 | 5,477 |
| 2 | October 21, 2015 22:00 | October 22, 2015 01:30 | 3h 30m | 12,600 | 12K |
| 3 | March 13, 2015 02:00 | March 13, 2015 02:15 | 15m | 6,290 | 1,573 |
| 4 | June 9, 2015 22:30 | June 10, 2015 00:30 | 2h | 6,207 | 6,763 |
| 5 | December 5, 2015 17:30 | December 5, 2015 23:00 | 5h 30m | 3,545 | 3,772 |
| 6 | August 2, 2015 19:00 | August 4, 2015 05:00 | 1d 10h | 2,950 | 20K |
| 7 | September 17, 2015 19:00 | September 19, 2015 05:30 | 1d 10h | 2,500 | 10K |
| 8 | July 13, 2015 11:30 | July 14, 2015 21:30 | 1d 10h | 2,048 | 13K |
| 9 | November 21, 2015 00:00 | November 23, 2015 02:30 | 2d 2h | 1,949 | 19K |
| 10 | April 10, 2015 01:30 | April 11, 2015 06:00 | 1d 4h | 1,918 | 16K |
Outage episodes by size in 2015: 143 reached 100+ customers, 26 reached 1,000+ customers, 2 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 2015, 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 | 2015 | 1.8 hrs | 0.97 | 72 min | 0.86 |
| 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 2015; 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, 2015, 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/2015/illinois/mchenry-county