Power Out Map
– 0% of Hartford out 0 customers out in Connecticut

Power outage history

Hartford County Connecticut

3.9hours

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

8th most of 8 in Connecticut 40% below the national median

Worst outage on record Hurricane Isaias · Aug 5, 2020 31% of customers out · 90% back in 4.2 days
Hours without power, average customer per year 3.9h / yr State average 7.3 h · national median 6.6 h
Major outages a year 0.1 Peaks over 10% of customers or 50,000 customers
Typical time to restore 90% 4.2days Median across major outages, from the peak
Longest single outage 5.8days Hurricane Isaias, over 1% of customers out
Outage hours on storm days 96% Share falling on days with a NOAA storm report here
Worst year 2020 23 hours without power, average customer
Electricity customers 572,922 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 Hartford'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 23 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Hartford, hours without power per customer

HartfordUS median countyConnecticut average
0 10 20 30 1.1 ’15 1.3 ’16 1.3 ’17 1.3 ’18 1.3 ’19 23 ’20 1.3 ’21 1.1 ’22 1.0 ’23 1.6 ’24 0.4 ’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 179,370 31% 5.8 d 4.2 d 13M
Jun 26, 2024 Thunderstorms 22,105 4% 19 h 24 h 332k
Oct 30, 2017 Windstorm 25,830 5% 24 h 35 h 320k
Oct 31, 2019 No storm report 23,767 4% 19 h 19 h 225k
Feb 25, 2016 Thunderstorms 25,287 4% 14 h 17 h 199k
Dec 23, 2022 Windstorm 21,699 4% 14 h 23 h 166k
Mar 7, 2018 Winter storm 9,004 2% 17 h 28 h 132k
Oct 17, 2019 No storm report 11,596 2% 13 h 22 h 98k
Mar 2, 2018 No storm report 14,500 3% 9.2 h 21 h 76k
Dec 18, 2023 No storm report 9,568 2% 11 h 21 h 69k
Sep 8, 2023 Thunderstorms 12,341 2% 6.2 h 9.0 h 56k
Apr 5, 2015 Windstorm 13,069 2% 6.2 h 13 h 53k

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 Hartford from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.

  • Tropical storm 89%
  • Thunderstorms 4.1%
  • No storm on record 3.8%
  • Windstorm 1.8%
  • Winter storm 0.9%

Who keeps the lights on

Utilities serving Hartford

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
Farmington River Power Company Investor Owned – – – – –

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 572,922 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 →