Power outage history
Middlesex County Connecticut
9.5hours
without power for the average customer in a typical year, 2018–2025
4th most of 8 in Connecticut 1.5× 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 Middlesex'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 43 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Middlesex, 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 | 50,926 | 54% | 6.3 d | 4.7 d | 3.8M |
| Mar 7, 2018 | Winter storm | 34,101 | 36% | 3.8 d | 2.8 d | 1.3M |
| Oct 29, 2017 | No storm report | 24,606 | 26% | 2.1 d | 41 h | 590k |
| Jun 23, 2015 | Thunderstorms | 38,352 | 40% | 37 h | 27 h | 512k |
| Dec 23, 2022 | Windstorm | 15,451 | 16% | 38 h | 28 h | 170k |
| Nov 1, 2019 | Windstorm | 12,039 | 13% | 35 h | 22 h | 153k |
| Dec 18, 2023 | Windstorm | 9,813 | 10% | 35 h | 29 h | 120k |
| Jun 26, 2024 | No storm report | 5,207 | 6% | 23 h | 20 h | 91k |
| Mar 2, 2018 | Windstorm | 12,512 | 13% | 28 h | 16 h | 82k |
| Feb 5, 2016 | Winter storm | 8,571 | 9% | 24 h | 22 h | 75k |
| May 15, 2018 | Thunderstorms | 10,969 | 12% | 14 h | 13 h | 61k |
| Apr 13, 2020 | Windstorm | 8,484 | 9% | 14 h | 10 h | 52k |
| Feb 24, 2016 | Thunderstorms | 7,135 | 8% | 16 h | 14 h | 41k |
| Nov 30, 2020 | No storm report | 7,824 | 8% | 12 h | 9.8 h | 41k |
| Oct 16, 2019 | Flooding | 2,010 | 2% | 26 h | – | 36k |
| Jan 20, 2019 | Winter storm | 5,242 | 6% | 14 h | 17 h | 36k |
| Feb 16, 2025 | Ice storm | 4,451 | 5% | 13 h | – | 30k |
| Aug 11, 2016 | Thunderstorms | 6,239 | 7% | 8.5 h | 5.8 h | 29k |
| Sep 1, 2021 | Hurricane Ida | 3,205 | 3% | 14 h | – | 29k |
| Mar 11, 2024 | No storm report | 4,436 | 5% | 11 h | – | 21k |
| Feb 18, 2022 | No storm report | 3,095 | 3% | 9.2 h | – | 18k |
| Jul 9, 2021 | Hurricane Elsa | 2,419 | 3% | 10 h | – | 17k |
| Jun 27, 2015 | No storm report | 3,058 | 3% | 6.2 h | – | 17k |
| Nov 30, 2022 | No storm report | 5,017 | 5% | 9.2 h | 9.5 h | 16k |
| Mar 1, 2021 | No storm report | 2,133 | 2% | 12 h | – | 15k |
| Jul 6, 2021 | Thunderstorms | 2,551 | 3% | 9.0 h | – | 13k |
| Aug 22, 2021 | Hurricane Henri | 2,438 | 3% | 8.5 h | – | 12k |
| Sep 30, 2020 | Windstorm | 3,614 | 4% | 8.8 h | – | 11k |
| Aug 20, 2015 | No storm report | 8,212 | 9% | 2.2 h | 2.2 h | 9.8k |
| Jun 27, 2023 | No storm report | 1,765 | 2% | 7.2 h | – | 9.6k |
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 Middlesex from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Tropical storm 62%
- Winter storm 21%
- Windstorm 9.5%
- No storm on record 5.8%
- Thunderstorms 1.4%
- Flooding 0.6%
Who keeps the lights on
Utilities serving Middlesex
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 |
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
- Middlesex (this county) 9.5 h
- New London 9.2 h
- New Haven 5.7 h
- Hartford 3.9 h
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 94,735 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 →