Power Out Map
– 0% of Dukes out 0 customers out in Massachusetts

Power outage history

Dukes County Massachusetts

5.3hours

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

7th most of 14 in Massachusetts 19% below the national median

Worst outage on record Tropical Storm Wanda · Oct 27, 2021 66% of customers out · 90% back in 32 hours
Hours without power, average customer per year 5.3h / yr State average 5.7 h · national median 6.6 h
Major outages a year 2.6 Peaks over 10% of customers or 50,000 customers
Typical time to restore 90% 2hours Median across major outages, from the peak
Longest single outage 2.4days Mar 13, 2018, over 1% of customers out
Outage hours on storm days 76% Share falling on days with a NOAA storm report here
Worst year 2018 15 hours without power, average customer
Electricity customers 20,864 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 Dukes'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

2018 was the worst well-recorded year, at 15 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Dukes, hours without power per customer

DukesUS median countyMassachusetts average
0 5 10 15 20 1.4 ’15 1.1 ’16 3.2 ’17 15 ’18 3.1 ’19 0.7 ’20 13 ’21 4.4 ’22 2.0 ’23 2.4 ’24 1.4 ’25 US 6.6 MA 5.7

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
Oct 27, 2021 Tropical Storm Wanda 13,854 66% 34 h 32 h 185k
Mar 2, 2018 Windstorm 15,182 73% 2.2 d 21 h 156k
Mar 13, 2018 Winter storm 11,371 55% 2.4 d 30 h 150k
Oct 28, 2021 No storm report 3,240 16% 47 h 47 h 72k
Oct 17, 2019 Windstorm 10,264 49% 27 h 11 h 58k
Jan 29, 2022 Winter storm 3,641 17% 30 h 28 h 53k
Feb 9, 2017 Winter storm 6,988 33% 25 h 11 h 33k
Feb 15, 2023 No storm report 9,667 46% 2.0 h 5.0 h 17k
Oct 30, 2017 Windstorm 3,959 19% 14 h 4.2 h 14k
Jun 28, 2015 Windstorm 7,886 38% 3.8 h 48 min 14k
Jul 26, 2024 No storm report 2,130 10% 6.0 h 5.2 h 13k
Feb 13, 2024 Winter storm 1,901 9% 11 h 11 h 10k

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 +2h 90% by +12h

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

  • Windstorm 27%
  • Winter storm 26%
  • No storm on record 24%
  • Tropical storm 23%

Who keeps the lights on

Utilities serving Dukes

As each utility reports to the Energy Information Administration for its whole Massachusetts territory, not this county alone. Outage minutes include major storm days.

Utility Type Outage min / yr Excl. major storms Outages / yr Residential ¢/kWh Customers
NSTAR Electric Company Investor Owned 113 66 0.81 21.5 1.3M

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 Massachusetts

Where it is darkest

Hours / yr64+

All Massachusetts 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 20,864 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 →