Power Out Map
– 0% of New Haven out 0 customers out in Connecticut

Power outage history

New Haven County Connecticut

5.7hours

without power for the average customer in a typical year, 2018–2025

7th most of 8 in Connecticut close to the national median

Worst outage on record Hurricane Isaias · Aug 5, 2020 37% of customers out · 90% back in 4.4 days
Hours without power, average customer per year 5.7h / yr State average 7.3 h · national median 6.6 h
Major outages a year 0.5 Peaks over 10% of customers or 50,000 customers
Typical time to restore 90% 45hours Median across major outages, from the peak
Longest single outage 6.2days Hurricane Isaias, over 1% of customers out
Outage hours on storm days 97% Share falling on days with a NOAA storm report here
Worst year 2020 31 hours without power, average customer
Electricity customers 383,498 ORNL customer model · 8 well-covered years

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 Haven's customers who were without power at that day's worst moment.

20152016201720182019202020212022202320242025
0%100% of customers out

Year by year

Hours in the dark, per customer

2020 was the worst well-recorded year, at 31 hours for the average customer. Hatched years have a thin record and are left out of the averages.

New Haven, hours without power per customer

New HavenUS median countyConnecticut average
0 5 10 15 20 1.4 ’15 1.4 ’16 2.5 ’17 6.7 ’18 2.4 ’19 31 ’20 1.4 ’21 1.5 ’22 1.2 ’23 1.1 ’24 0.9 ’25 CT 7.3 US 6.6

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 140,925 37% 6.2 d 4.4 d 10M
Aug 27, 2020 Thunderstorms 50,268 13% 2.0 d 44 h 1.0M
Mar 7, 2018 Winter storm 38,525 10% 2.1 d 45 h 715k
May 15, 2018 Thunderstorms 50,262 13% 26 h 12 h 630k
Oct 29, 2017 Windstorm 35,290 9% 37 h 36 h 517k
Jan 20, 2019 Winter storm 22,382 6% 36 h 28 h 424k
May 18, 2018 No storm report 14,059 4% 48 h 2.5 d 321k
Dec 23, 2022 Windstorm 14,326 4% 29 h 31 h 200k
Jun 23, 2015 Thunderstorms 18,865 5% 26 h 28 h 170k
Feb 16, 2025 Ice storm 12,796 3% 23 h 29 h 151k
Mar 2, 2018 Windstorm 12,506 3% 23 h 22 h 131k
Dec 18, 2023 Flooding 14,231 4% 14 h 12 h 125k

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.

0% 25% 50% 75% 100% peak+24h+48h+72h+96h half back by +14h 90% by +44h

When it happens

The outage clock

Customer-hours out by month (rings, January innermost) and local hour, 2018–2025.

00061218 Jan inside

What was happening

Weather behind the outages

Each outage is matched to NOAA storm reports for New Haven from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.

  • Tropical storm 71%
  • Thunderstorms 12%
  • Winter storm 8.0%
  • No storm on record 3.4%
  • Windstorm 3.3%
  • Ice storm 1.1%
  • Flooding 0.9%

Who keeps the lights on

Utilities serving New Haven

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
United Illuminating Co Investor Owned 73 39 0.66 35.4 315k
Town of Wallingford Municipal 53 53 0.44 17.8 21k

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

Across Connecticut

Where it is darkest

Hours / yr64+

All Connecticut 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 383,498 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 →