Suffolk County Power Outage History
2015–2025 · Massachusetts
Top 20% most reliable nationally — infrequent, short outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| May 14, 2025 | 1 hrs | 27,817 (2%) | Unnamed event |
| Jul 24, 2022 | 24 hrs | 22,288 (1%) | Unnamed event |
| Jul 29, 2025 | 14 hrs | 18,010 (1%) | Thunderstorm Wind |
| Nov 3, 2023 | 3 hrs | 15,082 (1%) | Unnamed event |
| Dec 23, 2023 | 3 hrs | 13,056 (1%) | High Wind |
Over the 11 years from 2015 to 2025, Suffolk County recorded 3,288 distinct power outage events, averaging 2.7 hours per event.
The single worst outage on record in Suffolk County started May 14, 2025, lasting 1 hours and leaving up to 27,817 customers without power (2% of the county) at its peak.
July has historically been the worst month for outages in Suffolk County, with 377 events recorded during that month across the dataset.
Based on this history, Suffolk County earns a Reliability Grade of A, placing it in the 96th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Suffolk County's outage profile
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Similar counties in Massachusetts
Counties with the closest reliability grade and national percentile to Suffolk County.
| County | Grade | National percentile |
|---|---|---|
| Hampshire County | A | 91st |
| Berkshire County | A | 89th |
| Franklin County | A | 85th |
| Hampden County | B | 79th |
| Bristol County | B | 78th |
FAQ
How often does power go out in Suffolk County?
Between 2015 and 2025, Suffolk County recorded 3,288 outage events, averaging 2.7 hours each.
What is Suffolk County's reliability grade?
Suffolk County has a Reliability Grade of A, in the 96th national percentile.
What was the worst power outage in Suffolk County?
The worst outage on record started May 14, 2025, lasting 1 hours and affecting up to 27,817 customers.