Merrimack 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 | 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 |
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).
Sized for Merrimack County's outage profile
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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 |
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.