Merrimack 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 | 97 hrs | 61,747 (47%) | Winter Storm |
| Oct 30, 2017 | 115 hrs | 37,350 (28%) | Tropical Storm Philippe |
| Mar 23, 2024 | 69 hrs | 30,245 (23%) | Winter Storm |
| Dec 23, 2022 | 75 hrs | 28,015 (21%) | Winter Storm |
| Dec 5, 2015 | 2 hrs | 27,800 (21%) | Unnamed event |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Merrimack County, New Hampshire that day.
Over the 12 years from 2014 to 2025, Merrimack County recorded 1,150 distinct power outage events, averaging 2.8 hours per event.
The single worst outage on record in Merrimack County started November 26, 2014 (Winter Storm), lasting 97 hours and leaving up to 61,747 customers without power (47% of the county) at its peak.
June has historically been the worst month for outages in Merrimack County, with 116 events recorded during that month across the dataset.
Based on this history, Merrimack 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 Merrimack County.
| County | Grade | National percentile |
|---|---|---|
| Hillsborough 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 Merrimack County?
Between 2014 and 2025, Merrimack County recorded 1,150 outage events, averaging 2.8 hours each.
What is Merrimack County's reliability grade?
Merrimack County has a Reliability Grade of D, in the 33rd national percentile.
What was the worst power outage in Merrimack County?
The worst outage on record started November 26, 2014 (Winter Storm), lasting 97 hours and affecting up to 61,747 customers.