Nantucket CountyPower Outage History
2014–2025 · Massachusetts
Average — typical outage frequency and duration nationally.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jan 29, 2022 | 56 hrs | 5,764 (89%) | Coastal Flood |
| Jan 23, 2016 | 12 hrs | 2,873 (45%) | Blizzard |
| Apr 4, 2020 | 2 hrs | 2,798 (43%) | Coastal Flood |
| Jun 9, 2020 | <1 hr | 2,678 (42%) | Unnamed event |
| Feb 8, 2016 | 2 hrs | 1,973 (31%) | Blizzard |
Over the 12 years from 2014 to 2025, Nantucket County recorded 642 distinct power outage events, averaging 2.6 hours per event.
The single worst outage on record in Nantucket County started January 29, 2022 (Coastal Flood), lasting 56 hours and leaving up to 5,764 customers without power (89% of the county) at its peak.
July has historically been the worst month for outages in Nantucket County, with 81 events recorded during that month across the dataset.
Based on this history, Nantucket County earns a Reliability Grade of C, placing it in the 47th percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Massachusetts
Counties with the closest reliability grade and national percentile to Nantucket County.
| County | Grade | National percentile |
|---|---|---|
| Plymouth County | C | 47th |
| Essex County | C | 50th |
| Worcester County | C | 55th |
| Barnstable County | D | 37th |
| Middlesex County | B | 64th |
Most reliable counties in Massachusetts
The top 3 counties in Massachusetts by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Suffolk County | A | 96th |
| Hampshire County | A | 91st |
| Berkshire County | A | 89th |
Least reliable counties in Massachusetts
The bottom 3 counties in Massachusetts by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Barnstable County | D | 37th |
| Plymouth County | C | 47th |
| Nantucket County | C | 47th |
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 Nantucket County?
Between 2014 and 2025, Nantucket County recorded 642 outage events, averaging 2.6 hours each.
What is Nantucket County's reliability grade?
Nantucket County has a Reliability Grade of C, in the 47th national percentile.
What was the worst power outage in Nantucket County?
The worst outage on record started January 29, 2022 (Coastal Flood), lasting 56 hours and affecting up to 5,764 customers.