Power outages in McHenry County, IL
We don't have a live outage feed for the utilities serving McHenry County yet. Commonwealth Edison Co and Rock Energy Cooperative serve this county.
Right now
No live outage data for McHenry County yet.
i
This utility doesn't publish outage data we can read automatically, so it isn't in our totals. Its own outage map has its current outages.i
From EIA Form 861, the U.S. Energy Information Administration's yearly survey of every electric utility and the areas it serves.i
This utility doesn't publish outage data we can read automatically, so it isn't in our totals. Its own outage map has its current outages.i
From EIA Form 861, the U.S. Energy Information Administration's yearly survey of every electric utility and the areas it serves.Outage map
Outage history in McHenry County
2014–2025 recordMcHenry County averaged 8.3 significant outages a year in 2023–2025, fewer than most Illinois counties.
In the 12 months to December 2025, there were 8. Half were over within 1.5 hours; the longest lasted 34 hours, starting August 16, 2025.
The largest on record began February 22, 2023, with 36,109 customers out at once.
Outages are most common in July.
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At least 1% of the area's customers, and at least 100, without power at the same time. Outages less than 6 hours apart count as one.i
Half of significant outages here ended sooner than this, and half lasted longer.| Largest events (start) | Peak out | LastediHow long this area stayed at or above the significant-outage line, not how long any one home was without power. | Customer-hoursiCustomers out multiplied by hours out, added up over the event. 1,000 customers out for 3 hours is 3,000 customer-hours. |
|---|---|---|---|
| February 22, 2023 | 36,109 | 2.3 days | 837,082 |
| August 11, 2021 | 30,959 | 2.7 days | 747,961 |
| September 25, 2018 | 24,431 | 24 hours | 216,157 |
| August 10, 2020 | 18,037 | 1.8 days | 265,851 |
| August 16, 2025 | 13,250 | 34 hours | 214,806 |
Recorded outages from EAGLE-I, Oak Ridge National Laboratory (CC BY 4.0).i
From EAGLE-I, Oak Ridge National Laboratory's record of utility outage data every 15 minutes since 2014 (CC BY 4.0). It covered about 9 in 10 U.S. customers.
Cities in McHenry County
Utilities
- Commonwealth Edison Co no live feed
- Rock Energy Cooperative no live feed
- All Illinois outages