Carroll CountyPower Outage History
What this grade means
Bottom 20% least reliable nationally — frequent and/or long outages. This county ranks in the least reliable fifth of all US counties in our dataset: some combination of frequent outages, long restoration times, or customers affected puts it near the bottom nationally. Backup power is worth prioritizing here rather than treating it as optional.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Dec 16, 2022 | 50 hrs | 16,569 (61%) | Winter Storm |
| Nov 27, 2018 | 47 hrs | 14,308 (52%) | Heavy Snow |
| Aug 4, 2020 | 71 hrs | 13,723 (50%) | Tropical Storm Isaias |
| Mar 7, 2025 | 31 hrs | 13,683 (50%) | Unnamed event |
| Oct 30, 2017 | 108 hrs | 13,028 (48%) | Tropical Storm Philippe |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Carroll County, New Hampshire that day.
Over the 12 years from 2014 to 2025, Carroll County recorded 1,151 distinct power outage events, averaging 3.1 hours per event.
The single worst outage on record in Carroll County started December 16, 2022 (Winter Storm), lasting 50 hours and leaving up to 16,569 customers without power (61% of the county) at its peak.
July has historically been the worst month for outages in Carroll County, with 120 events recorded during that month across the dataset.
Based on this history, Carroll County earns a Reliability Grade of F, placing it in the 11th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in New Hampshire
Counties with the closest reliability grade and national percentile to Carroll County.
| County | Grade | National percentile |
|---|---|---|
| Belknap County | F | 9th |
| Sullivan County | F | 16th |
| Cheshire County | F | 18th |
| Grafton County | D | 26th |
| Rockingham County | D | 27th |
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 Carroll County?
Between 2014 and 2025, Carroll County recorded 1,151 outage events, averaging 3.1 hours each.
What is Carroll County's reliability grade?
Carroll County has a Reliability Grade of F, in the 11th national percentile.
What was the worst power outage in Carroll County?
The worst outage on record started December 16, 2022 (Winter Storm), lasting 50 hours and affecting up to 16,569 customers.