Belknap 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 |
|---|---|---|---|
| Oct 30, 2017 | 112 hrs | 20,394 (63%) | Tropical Storm Philippe |
| Apr 4, 2024 | 97 hrs | 20,092 (62%) | Winter Storm |
| Dec 23, 2022 | 206 hrs | 19,985 (61%) | Winter Storm |
| Nov 26, 2014 | 49 hrs | 13,688 (42%) | Winter Storm |
| Aug 4, 2020 | 67 hrs | 9,254 (28%) | Tropical Storm Isaias |
Over the 12 years from 2014 to 2025, Belknap County recorded 793 distinct power outage events, averaging 4.6 hours per event.
The single worst outage on record in Belknap County started October 30, 2017 (Tropical Storm Philippe), lasting 112 hours and leaving up to 20,394 customers without power (63% of the county) at its peak.
March has historically been the worst month for outages in Belknap County, with 81 events recorded during that month across the dataset.
Based on this history, Belknap County earns a Reliability Grade of F, placing it in the 9th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Belknap County's outage profile
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Similar counties in New Hampshire
Counties with the closest reliability grade and national percentile to Belknap County.
| County | Grade | National percentile |
|---|---|---|
| Carroll County | F | 11th |
| Sullivan County | F | 16th |
| Cheshire County | F | 18th |
| Grafton County | D | 26th |
| Rockingham County | D | 27th |
FAQ
How often does power go out in Belknap County?
Between 2014 and 2025, Belknap County recorded 793 outage events, averaging 4.6 hours each.
What is Belknap County's reliability grade?
Belknap County has a Reliability Grade of F, in the 9th national percentile.
What was the worst power outage in Belknap County?
The worst outage on record started October 30, 2017 (Tropical Storm Philippe), lasting 112 hours and affecting up to 20,394 customers.