Power outage history
New London County Connecticut
9.2hours
without power for the average customer in a typical year, 2018–2025
5th most of 8 in Connecticut 1.4× the national median
Every day since 2015
Eleven years, one night at a time
Each cell is a day. The brighter it is, the larger the share of New London's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2020 was the worst well-recorded year, at 35 hours for the average customer. Hatched years have a thin record and are left out of the averages.
New London, hours without power per customer
The record
The biggest outages since 2015
Ranked by customer-hours lost: customers out multiplied by how long they stayed out. Times are local.
| Began | Storm | Peak out | Share | Lasted | 90% restored | Customer-hours |
|---|---|---|---|---|---|---|
| Aug 4, 2020 | Hurricane Isaias | 37,902 | 48% | 6.1 d | 4.3 d | 2.4M |
| Oct 29, 2017 | Windstorm | 44,199 | 56% | 2.2 d | 44 h | 1.4M |
| Mar 7, 2018 | Winter storm | 22,920 | 29% | 2.8 d | 42 h | 579k |
| Mar 2, 2018 | Windstorm | 15,129 | 19% | 2.2 d | 34 h | 288k |
| Feb 5, 2016 | Winter storm | 24,526 | 31% | 38 h | 27 h | 275k |
| Dec 18, 2023 | Windstorm | 10,080 | 13% | 45 h | 30 h | 231k |
| Oct 31, 2019 | Windstorm | 17,215 | 22% | 36 h | 18 h | 204k |
| Jun 23, 2015 | Thunderstorms | 15,074 | 19% | 33 h | 26 h | 196k |
| Oct 16, 2019 | Flooding | 9,167 | 12% | 40 h | 24 h | 163k |
| Dec 23, 2022 | Windstorm | 6,739 | 9% | 38 h | 36 h | 147k |
| Feb 25, 2016 | Thunderstorms | 10,043 | 13% | 20 h | 17 h | 110k |
| Aug 22, 2021 | Hurricane Henri | 11,204 | 14% | 27 h | 22 h | 109k |
| Nov 30, 2020 | Windstorm | 10,851 | 14% | 19 h | 13 h | 99k |
| Aug 4, 2015 | Thunderstorms | 10,406 | 13% | 8.5 h | 8.5 h | 51k |
| Feb 7, 2020 | Windstorm | 8,579 | 11% | 11 h | 9.2 h | 36k |
| Apr 13, 2020 | Windstorm | 7,332 | 9% | 16 h | 15 h | 32k |
| Nov 12, 2021 | Windstorm | 5,747 | 7% | 11 h | 12 h | 28k |
| Oct 27, 2021 | Tropical Storm Wanda | 4,806 | 6% | 10 h | 1.5 h | 28k |
| Feb 25, 2019 | Windstorm | 2,566 | 3% | 23 h | – | 27k |
| Mar 7, 2025 | No storm report | 3,069 | 4% | 15 h | – | 27k |
| Jan 24, 2017 | Windstorm | 4,868 | 6% | 13 h | 12 h | 26k |
| Feb 16, 2016 | Windstorm | 7,608 | 10% | 6.2 h | 4.2 h | 23k |
| Dec 25, 2020 | Windstorm | 4,782 | 6% | 6.2 h | 4.8 h | 21k |
| Feb 18, 2022 | Windstorm | 3,617 | 5% | 10 h | – | 21k |
| Mar 2, 2021 | Windstorm | 3,703 | 5% | 14 h | – | 20k |
| May 15, 2018 | Thunderstorms | 3,252 | 4% | 8.8 h | – | 20k |
| Nov 3, 2018 | No storm report | 3,746 | 5% | 8.0 h | – | 19k |
| Sep 6, 2017 | Thunderstorms | 4,830 | 6% | 6.8 h | 4.8 h | 16k |
| Nov 15, 2020 | No storm report | 2,312 | 3% | 10 h | – | 15k |
| Sep 2, 2021 | Hurricane Ida | 2,679 | 3% | 9.0 h | – | 15k |
After the peak
How fast the lights come back
Each line is one major outage, from its peak. The amber line is the typical path.
When it happens
The outage clock
Customer-hours out by month (rings, January innermost) and local hour, 2018–2025.
What was happening
Weather behind the outages
Each outage is matched to NOAA storm reports for New London from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Tropical storm 52%
- Windstorm 24%
- Winter storm 13%
- No storm on record 6.2%
- Flooding 3.4%
- Thunderstorms 1.0%
Who keeps the lights on
Utilities serving New London
As each utility reports to the Energy Information Administration for its whole Connecticut territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Connecticut Light & Power Co | Investor Owned | 217 | 85 | 1.00 | 28.9 | 1.2M |
| City of Norwich | Municipal | 169 | 169 | 1.48 | 23.4 | 19k |
| City of Jewett City | CT | – | – | – | 17.6 | 14k |
| Groton Dept of Utilities | Municipal | 71 | 71 | 0.36 | 18.1 | 13k |
| Bozrah Light & Power Company | Municipal | 126 | 79 | 0.61 | 19.8 | 2.4k |
| Mohegan Tribal Utility Authority | CT | – | – | – | – | – |
EIA Form 861, latest year each utility reported. Outage minutes are SAIDI, the yearly minutes the average customer goes without power; outages a year are SAIFI.
Next door
Neighbouring counties
About these numbers
Notes
Outages come from the EAGLE-I record of utility outage maps collected every 15 minutes by Oak Ridge National Laboratory. Hours without power are customer-hours divided by the county's 78,303 electricity customers. Averages use well-covered years from 2018. Outages shorter than 15 minutes, and utilities that publish no outage map, are not in the record, so these figures understate the total. How every number is made →