Norfolk CountyPower Outage History
What this grade means
Better than average — fewer or shorter outages than most counties. This county's outage history is better than the national median: recorded outages are less frequent and/or shorter in duration than a typical US county experienced over the same 12-year period. It isn't in the top tier nationally, but its track record points to lower-than-average outage risk.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Oct 27, 2021 | 21 hrs | 126,740 (20%) | High Wind |
| Oct 27, 2021 | 18 hrs | 68,520 (11%) | High Wind |
| Mar 2, 2018 | 87 hrs | 68,310 (11%) | High Wind |
| Dec 18, 2023 | 68 hrs | 55,159 (9%) | High Wind |
| Oct 7, 2020 | 54 hrs | 43,408 (7%) | Thunderstorm Wind |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Norfolk County, Massachusetts that day.
Over the 12 years from 2014 to 2025, Norfolk County recorded 2,598 distinct power outage events, averaging 2.4 hours per event.
The single worst outage on record in Norfolk County started October 27, 2021 (High Wind), lasting 21 hours and leaving up to 126,740 customers without power (20% of the county) at its peak.
July has historically been the worst month for outages in Norfolk County, with 324 events recorded during that month across the dataset.
Based on this history, Norfolk County earns a Reliability Grade of B, placing it in the 73rd percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Massachusetts
Counties with the closest reliability grade and national percentile to Norfolk County.
| County | Grade | National percentile |
|---|---|---|
| Bristol County | B | 78th |
| Hampden County | B | 79th |
| Dukes County | B | 67th |
| Middlesex County | B | 64th |
| Franklin County | A | 85th |
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 Norfolk County?
Between 2014 and 2025, Norfolk County recorded 2,598 outage events, averaging 2.4 hours each.
What is Norfolk County's reliability grade?
Norfolk County has a Reliability Grade of B, in the 73rd national percentile.
What was the worst power outage in Norfolk County?
The worst outage on record started October 27, 2021 (High Wind), lasting 21 hours and affecting up to 126,740 customers.