Fairfield CountyPower Outage History
What this grade means
Bottom 20% least reliable nationally — frequent and/or long outages. This county ranks in the least reliable fifth of all US counties in our dataset: some combination of frequent outages, long restoration times, or customers affected puts it near the bottom nationally. Backup power is worth prioritizing here rather than treating it as optional.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Aug 4, 2020 | 204 hrs | 190,956 (61%) | Tropical Storm Isaias |
| Mar 7, 2018 | 110 hrs | 64,829 (21%) | Winter Weather |
| May 15, 2018 | 31 hrs | 47,402 (15%) | Thunderstorm Wind |
| Jun 23, 2015 | 21 hrs | 33,904 (11%) | Thunderstorm Wind |
| Jul 3, 2023 | 11 hrs | 29,682 (10%) | Thunderstorm Wind |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Fairfield County, Connecticut that day.
Over the 12 years from 2014 to 2025, Fairfield County recorded 2,958 distinct power outage events, averaging 2.3 hours per event.
The single worst outage on record in Fairfield County started August 4, 2020 (Tropical Storm Isaias), lasting 204 hours and leaving up to 190,956 customers without power (61% of the county) at its peak.
July has historically been the worst month for outages in Fairfield County, with 373 events recorded during that month across the dataset.
Based on this history, Fairfield County earns a Reliability Grade of F, placing it in the 19th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Connecticut
Counties with the closest reliability grade and national percentile to Fairfield County.
| County | Grade | National percentile |
|---|---|---|
| New London County | F | 19th |
| Litchfield County | F | 18th |
| Middlesex County | D | 21st |
| Windham County | F | 15th |
| Tolland County | D | 26th |
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 Fairfield County?
Between 2014 and 2025, Fairfield County recorded 2,958 outage events, averaging 2.3 hours each.
What is Fairfield County's reliability grade?
Fairfield County has a Reliability Grade of F, in the 19th national percentile.
What was the worst power outage in Fairfield County?
The worst outage on record started August 4, 2020 (Tropical Storm Isaias), lasting 204 hours and affecting up to 190,956 customers.