Middlesex County Power Outage History
2014–2025 · Massachusetts
Better than average — fewer or shorter outages than most counties. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Mar 8, 2018 | 93 hrs | 148,898 (18%) | High Wind |
| Dec 18, 2023 | 67 hrs | 85,579 (11%) | High Wind |
| Oct 29, 2017 | 100 hrs | 66,566 (8%) | Tropical Storm Phillipe |
| May 29, 2015 | 5 hrs | 44,646 (6%) | Thunderstorm Wind |
| Mar 14, 2017 | 29 hrs | 44,504 (6%) | Drought |
Over the 12 years from 2014 to 2025, Middlesex County recorded 5,526 distinct power outage events, averaging 2.3 hours per event.
The single worst outage on record in Middlesex County started March 8, 2018 (High Wind), lasting 93 hours and leaving up to 148,898 customers without power (18% of the county) at its peak.
July has historically been the worst month for outages in Middlesex County, with 632 events recorded during that month across the dataset.
Based on this history, Middlesex County earns a Reliability Grade of B, placing it in the 64th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Middlesex County's outage profile
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Similar counties in Massachusetts
Counties with the closest reliability grade and national percentile to Middlesex County.
| County | Grade | National percentile |
|---|---|---|
| Dukes County | B | 67th |
| Worcester County | C | 55th |
| Norfolk County | B | 73rd |
| Essex County | C | 50th |
| Bristol County | B | 78th |
FAQ
How often does power go out in Middlesex County?
Between 2014 and 2025, Middlesex County recorded 5,526 outage events, averaging 2.3 hours each.
What is Middlesex County's reliability grade?
Middlesex County has a Reliability Grade of B, in the 64th national percentile.
What was the worst power outage in Middlesex County?
The worst outage on record started March 8, 2018 (High Wind), lasting 93 hours and affecting up to 148,898 customers.