Plymouth CountyPower Outage History
What this grade means
Average — typical outage frequency and duration nationally. This county sits in the middle of the national distribution — its outage frequency and duration over the past 12 years are close to the nationwide median, neither notably better nor worse than most other US counties. A typical amount of backup-power preparedness is reasonable here.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Oct 27, 2021 | 21 hrs | 351,202 (58%) | High Wind |
| Oct 27, 2021 | 18 hrs | 175,422 (29%) | High Wind |
| Mar 2, 2018 | 81 hrs | 141,383 (23%) | High Wind |
| Oct 28, 2021 | 79 hrs | 125,477 (21%) | High Wind |
| Mar 13, 2018 | 66 hrs | 65,310 (11%) | Coastal Flood |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Plymouth County, Massachusetts that day.
Over the 12 years from 2014 to 2025, Plymouth County recorded 1,891 distinct power outage events, averaging 2.3 hours per event.
The single worst outage on record in Plymouth County started October 27, 2021 (High Wind), lasting 21 hours and leaving up to 351,202 customers without power (58% of the county) at its peak.
July has historically been the worst month for outages in Plymouth County, with 213 events recorded during that month across the dataset.
Based on this history, Plymouth County earns a Reliability Grade of C, placing it in the 47th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Massachusetts
Counties with the closest reliability grade and national percentile to Plymouth County.
| County | Grade | National percentile |
|---|---|---|
| Nantucket County | C | 47th |
| Essex County | C | 50th |
| Worcester County | C | 55th |
| Barnstable County | D | 37th |
| Middlesex County | B | 64th |
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 Plymouth County?
Between 2014 and 2025, Plymouth County recorded 1,891 outage events, averaging 2.3 hours each.
What is Plymouth County's reliability grade?
Plymouth County has a Reliability Grade of C, in the 47th national percentile.
What was the worst power outage in Plymouth County?
The worst outage on record started October 27, 2021 (High Wind), lasting 21 hours and affecting up to 351,202 customers.