Plymouth County Power Outage History
2014–2025 · Massachusetts
Average — typical outage frequency and duration nationally. How grades are calculated
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 |
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).
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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 |
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.