New London County Power Outage History
2014–2025 · Connecticut
Bottom 20% least reliable nationally — frequent and/or long outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Oct 30, 2017 | 52 hrs | 44,199 (54%) | High Wind |
| Aug 4, 2020 | 151 hrs | 37,902 (46%) | Hurricane Isaias |
| Feb 5, 2016 | 40 hrs | 24,526 (30%) | Heavy Snow |
| Jun 28, 2018 | 2 hrs | 23,109 (28%) | Unnamed event |
| Mar 7, 2018 | 72 hrs | 22,920 (28%) | High Wind |
Over the 12 years from 2014 to 2025, New London County recorded 1,171 distinct power outage events, averaging 2.5 hours per event.
The single worst outage on record in New London County started October 30, 2017 (High Wind), lasting 52 hours and leaving up to 44,199 customers without power (54% of the county) at its peak.
July has historically been the worst month for outages in New London County, with 143 events recorded during that month across the dataset.
Based on this history, New London County earns a Reliability Grade of F, placing it in the 19th percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Connecticut
Counties with the closest reliability grade and national percentile to New London County.
| County | Grade | National percentile |
|---|---|---|
| Fairfield County | F | 19th |
| Litchfield County | F | 18th |
| Middlesex County | D | 21st |
| Windham County | F | 15th |
| Tolland County | D | 26th |
FAQ
How often does power go out in New London County?
Between 2014 and 2025, New London County recorded 1,171 outage events, averaging 2.5 hours each.
What is New London County's reliability grade?
New London County has a Reliability Grade of F, in the 19th national percentile.
What was the worst power outage in New London County?
The worst outage on record started October 30, 2017 (High Wind), lasting 52 hours and affecting up to 44,199 customers.