County annual report · FIPS 17111
2020 McHenry County, IL Power Outage Report
In 2020, customers in McHenry County, IL went without power for an average of 3.4 hours, a total of 404K customer-hours (Illinois average 5.9 hours). That ranks 51st worst of 102 Illinois counties and 1763rd of 3,019 nationally.
Compared with IL, the US and 2019
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in McHenry County, 2020
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 10, 2020 13:30 | August 16, 2020 00:30 | 5d 11h | 18,037 | 282K |
| 2 | November 10, 2020 22:30 | November 12, 2020 10:00 | 1d 11h | 3,418 | 18K |
| 3 | June 9, 2020 12:30 | June 11, 2020 04:15 | 1d 15h | 3,190 | 14K |
| 4 | May 23, 2020 23:30 | May 24, 2020 11:45 | 12h 15m | 2,948 | 4,081 |
| 5 | August 25, 2020 09:00 | August 25, 2020 22:45 | 13h 45m | 2,656 | 11K |
| 6 | April 2, 2020 14:30 | April 2, 2020 19:00 | 4h 30m | 2,223 | 1,796 |
| 7 | May 15, 2020 07:30 | May 15, 2020 15:30 | 8h | 1,243 | 1,498 |
| 8 | January 11, 2020 11:15 | January 12, 2020 03:15 | 16h | 1,074 | 2,370 |
| 9 | June 29, 2020 09:30 | June 30, 2020 10:45 | 1d 1h | 1,039 | 2,184 |
| 10 | July 23, 2020 13:45 | July 23, 2020 17:00 | 3h 15m | 944 | 1,307 |
Outage episodes by size in 2020: 97 reached 100+ customers, 9 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 2020, 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 | 2020 | 5.7 hrs | 0.83 | 40 min | 0.55 |
| Rock Energy Cooperative | 2020 | 1.7 hrs | 0.68 | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 94% of Illinois's customers in 2020; 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, 2020, 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/2020/illinois/mchenry-county