Hillsborough CountyPower Outage History
What this grade means
Worse than average — more frequent or longer outages than most counties. This county's recorded history shows more frequent outages and/or longer restoration times than most US counties over the same 12-year period. If you live here, it's worth taking backup power more seriously than an average household would.
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 hr | 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 |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Hillsborough County, New Hampshire that day.
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).
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 |
Most reliable counties nationally
The top 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | South Dakota | A | 100th |
| Clearwater County | Minnesota | A | 99th |
| Limestone County | Alabama | A | 99th |
Least reliable counties nationally
The bottom 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | West Virginia | F | 0th |
| Lincoln County | West Virginia | F | 0th |
| Cameron Parish | Louisiana | F | 0th |
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.