Middlesex County Power Outage History
2014–2025 · Connecticut
Worse than average — more frequent or longer 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 |
|---|---|---|---|
| Aug 4, 2020 | 172 hrs | 50,926 (54%) | Hurricane Isaias |
| Jun 23, 2015 | 21 hrs | 38,352 (40%) | Unnamed event |
| Mar 7, 2018 | 94 hrs | 34,101 (36%) | High Wind |
| Oct 30, 2017 | 51 hrs | 24,606 (26%) | Unnamed event |
| Dec 23, 2022 | 51 hrs | 15,451 (16%) | High Wind |
Over the 12 years from 2014 to 2025, Middlesex County recorded 1,082 distinct power outage events, averaging 2.5 hours per event.
The single worst outage on record in Middlesex County started August 4, 2020 (Hurricane Isaias), lasting 172 hours and leaving up to 50,926 customers without power (54% of the county) at its peak.
July has historically been the worst month for outages in Middlesex County, with 124 events recorded during that month across the dataset.
Based on this history, Middlesex County earns a Reliability Grade of D, placing it in the 21st percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Middlesex County's outage profile
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Similar counties in Connecticut
Counties with the closest reliability grade and national percentile to Middlesex County.
| County | Grade | National percentile |
|---|---|---|
| Fairfield County | F | 19th |
| New London County | F | 19th |
| Litchfield County | F | 18th |
| Tolland County | D | 26th |
| Windham County | F | 15th |
FAQ
How often does power go out in Middlesex County?
Between 2014 and 2025, Middlesex County recorded 1,082 outage events, averaging 2.5 hours each.
What is Middlesex County's reliability grade?
Middlesex County has a Reliability Grade of D, in the 21st national percentile.
What was the worst power outage in Middlesex County?
The worst outage on record started August 4, 2020 (Hurricane Isaias), lasting 172 hours and affecting up to 50,926 customers.