Middlesex CountyPower Outage History
What this grade means
(How grades are calculated)Worse than average — more frequent or longer outages than most counties. This county's recorded history shows more frequent outages and/or longer restoration times than most US counties over the same 12-year period. If you live here, it's worth taking backup power more seriously than an average household would.
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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%) | Thunderstorm Wind |
| 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 |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Middlesex County, Connecticut that day.
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).
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 |
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 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.