Hillsborough 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 |
|---|---|---|---|
| Nov 26, 2014 | 53 hrs | 78,205 (40%) | Heavy Snow |
| Oct 30, 2017 | 95 hrs | 58,016 (29%) | Tropical Storm Philippe |
| Nov 28, 2014 | 1 hrs | 39,642 (20%) | Heavy Snow |
| Nov 29, 2014 | 42 hrs | 32,247 (16%) | Heavy Snow |
| Mar 14, 2023 | 86 hrs | 29,343 (15%) | Winter Storm |
Over the 12 years from 2014 to 2025, Hillsborough County recorded 1,659 distinct power outage events, averaging 2.6 hours per event.
The single worst outage on record in Hillsborough County started November 26, 2014 (Heavy Snow), lasting 53 hours and leaving up to 78,205 customers without power (40% of the county) at its peak.
July has historically been the worst month for outages in Hillsborough County, with 204 events recorded during that month across the dataset.
Based on this history, Hillsborough County earns a Reliability Grade of D, placing it in the 33rd 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 Hillsborough County.
| County | Grade | National percentile |
|---|---|---|
| Merrimack County | D | 33rd |
| Coos County | D | 27th |
| Rockingham County | D | 27th |
| Grafton County | D | 26th |
| Strafford County | C | 41st |
FAQ
How often does power go out in Hillsborough County?
Between 2014 and 2025, Hillsborough County recorded 1,659 outage events, averaging 2.6 hours each.
What is Hillsborough County's reliability grade?
Hillsborough County has a Reliability Grade of D, in the 33rd national percentile.
What was the worst power outage in Hillsborough County?
The worst outage on record started November 26, 2014 (Heavy Snow), lasting 53 hours and affecting up to 78,205 customers.