Windham County Power Outage History
2014–2025 · Vermont
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 | 42 hrs | 16,122 (83%) | Tropical Storm Isaias |
| Mar 14, 2023 | 130 hrs | 15,904 (82%) | Winter Storm |
| Nov 27, 2018 | 34 hrs | 14,231 (73%) | Cold/Wind Chill |
| Nov 1, 2019 | 76 hrs | 14,012 (72%) | Strong Wind |
| Jan 16, 2021 | 18 hrs | 11,839 (61%) | Winter Weather |
Over the 12 years from 2014 to 2025, Windham County recorded 1,751 distinct power outage events, averaging 2.8 hours per event.
The single worst outage on record in Windham County started August 4, 2020 (Tropical Storm Isaias), lasting 42 hours and leaving up to 16,122 customers without power (83% of the county) at its peak.
July has historically been the worst month for outages in Windham County, with 193 events recorded during that month across the dataset.
Based on this history, Windham County earns a Reliability Grade of F, placing it in the 2nd percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Vermont
Counties with the closest reliability grade and national percentile to Windham County.
| County | Grade | National percentile |
|---|---|---|
| Orange County | F | 7th |
| Essex County | F | 9th |
| Windsor County | F | 11th |
| Addison County | F | 15th |
| Orleans County | D | 24th |
FAQ
How often does power go out in Windham County?
Between 2014 and 2025, Windham County recorded 1,751 outage events, averaging 2.8 hours each.
What is Windham County's reliability grade?
Windham County has a Reliability Grade of F, in the 2nd national percentile.
What was the worst power outage in Windham County?
The worst outage on record started August 4, 2020 (Tropical Storm Isaias), lasting 42 hours and affecting up to 16,122 customers.