Sullivan County Power Outage History
2014–2025 · New Hampshire
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 |
|---|---|---|---|
| Jul 19, 2015 | 32 hrs | 19,880 (82%) | Thunderstorm Wind |
| Mar 14, 2023 | 69 hrs | 9,262 (38%) | Winter Storm |
| Dec 17, 2022 | 62 hrs | 8,776 (36%) | Winter Storm |
| Dec 14, 2022 | 2 hrs | 8,672 (36%) | Unnamed event |
| Nov 27, 2018 | 48 hrs | 7,999 (33%) | Heavy Snow |
Over the 12 years from 2014 to 2025, Sullivan County recorded 855 distinct power outage events, averaging 3.3 hours per event.
The single worst outage on record in Sullivan County started July 19, 2015 (Thunderstorm Wind), lasting 32 hours and leaving up to 19,880 customers without power (82% of the county) at its peak.
June has historically been the worst month for outages in Sullivan County, with 87 events recorded during that month across the dataset.
Based on this history, Sullivan County earns a Reliability Grade of F, placing it in the 16th percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in New Hampshire
Counties with the closest reliability grade and national percentile to Sullivan County.
| County | Grade | National percentile |
|---|---|---|
| Cheshire County | F | 18th |
| Carroll County | F | 11th |
| Belknap County | F | 9th |
| Grafton County | D | 26th |
| Rockingham County | D | 27th |
FAQ
How often does power go out in Sullivan County?
Between 2014 and 2025, Sullivan County recorded 855 outage events, averaging 3.3 hours each.
What is Sullivan County's reliability grade?
Sullivan County has a Reliability Grade of F, in the 16th national percentile.
What was the worst power outage in Sullivan County?
The worst outage on record started July 19, 2015 (Thunderstorm Wind), lasting 32 hours and affecting up to 19,880 customers.