Grafton County Power Outage History
2014–2025 · New Hampshire
Worse than average — more frequent or longer outages than most counties. 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 | 11,415 (23%) | Tropical Storm Philippe |
| Aug 4, 2020 | 68 hrs | 11,201 (22%) | Tropical Storm Isaias |
| Dec 23, 2022 | 90 hrs | 9,802 (20%) | Winter Storm |
| Dec 16, 2022 | 50 hrs | 9,727 (19%) | Winter Storm |
| Jul 21, 2022 | 21 hrs | 9,431 (19%) | Hail |
Over the 12 years from 2014 to 2025, Grafton County recorded 897 distinct power outage events, averaging 3.2 hours per event.
The single worst outage on record in Grafton County started October 30, 2017 (Tropical Storm Philippe), lasting 112 hours and leaving up to 11,415 customers without power (23% of the county) at its peak.
June has historically been the worst month for outages in Grafton County, with 89 events recorded during that month across the dataset.
Based on this history, Grafton County earns a Reliability Grade of D, placing it in the 26th 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 Grafton County.
| County | Grade | National percentile |
|---|---|---|
| Rockingham County | D | 27th |
| Coos County | D | 27th |
| Merrimack County | D | 33rd |
| Hillsborough County | D | 33rd |
| Cheshire County | F | 18th |
FAQ
How often does power go out in Grafton County?
Between 2014 and 2025, Grafton County recorded 897 outage events, averaging 3.2 hours each.
What is Grafton County's reliability grade?
Grafton County has a Reliability Grade of D, in the 26th national percentile.
What was the worst power outage in Grafton County?
The worst outage on record started October 30, 2017 (Tropical Storm Philippe), lasting 112 hours and affecting up to 11,415 customers.