Windham County Power Outage History
2014–2025 · Connecticut
Bottom 20% least reliable nationally — frequent and/or long outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Aug 4, 2020 | 151 hrs | 38,276 (58%) | Tropical Storm Isaias |
| Feb 5, 2016 | 40 hrs | 24,401 (37%) | Heavy Snow |
| Oct 30, 2017 | 51 hrs | 17,280 (26%) | Tropical Storm Phillipe |
| Dec 18, 2023 | 66 hrs | 16,334 (25%) | High Wind |
| Feb 25, 2016 | 16 hrs | 15,315 (23%) | Unnamed event |
Over the 12 years from 2014 to 2025, Windham County recorded 815 distinct power outage events, averaging 3.4 hours per event.
The single worst outage on record in Windham County started August 4, 2020 (Tropical Storm Isaias), lasting 151 hours and leaving up to 38,276 customers without power (58% of the county) at its peak.
July has historically been the worst month for outages in Windham County, with 96 events recorded during that month across the dataset.
Based on this history, Windham County earns a Reliability Grade of F, placing it in the 15th percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Connecticut
Counties with the closest reliability grade and national percentile to Windham County.
| County | Grade | National percentile |
|---|---|---|
| Litchfield County | F | 18th |
| New London County | F | 19th |
| Fairfield County | F | 19th |
| Middlesex County | D | 21st |
| Tolland County | D | 26th |
FAQ
How often does power go out in Windham County?
Between 2014 and 2025, Windham County recorded 815 outage events, averaging 3.4 hours each.
What is Windham County's reliability grade?
Windham County has a Reliability Grade of F, in the 15th national percentile.
What was the worst power outage in Windham County?
The worst outage on record started August 4, 2020 (Tropical Storm Isaias), lasting 151 hours and affecting up to 38,276 customers.