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

Power outage history

Nantucket County Massachusetts

5.5hours

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

6th most of 14 in Massachusetts 17% below the national median

Worst outage on record Jan 27, 2015 100% of customers out · 90% back in 40 hours
Hours without power, average customer per year 5.5h / yr State average 5.7 h · national median 6.6 h
Major outages a year 4.6 Peaks over 10% of customers or 50,000 customers
Typical time to restore 90% 1hours Median across major outages, from the peak
Longest single outage 2.8days Jan 26, 2015, over 1% of customers out
Outage hours on storm days 54% Share falling on days with a NOAA storm report here
Worst year 2022 20 hours without power, average customer
Electricity customers 6,451 EAGLE-I 2024 count · 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 Nantucket'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

2022 was the worst well-recorded year, at 20 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Nantucket, hours without power per customer

NantucketUS median countyMassachusetts average
0 10 20 30 40 35 ’15 4.6 ’16 3.1 ’17 6.7 ’18 1.0 ’19 2.1 ’20 2.5 ’21 20 ’22 1.8 ’23 4.1 ’24 5.5 ’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
Jan 26, 2015 Winter storm 6,451 100% 2.8 d 40 h 206k
Jan 29, 2022 Flooding 5,764 89% 2.2 d 31 h 86k
Mar 13, 2018 Windstorm 6,451 100% 12 h 4.5 h 34k
Jan 23, 2016 Winter storm 2,873 45% 13 h 8.8 h 9.6k
Feb 9, 2017 No storm report 1,467 23% 6.2 h 2.0 h 6.6k
Dec 28, 2022 No storm report 1,307 20% 5.0 h 4.5 h 6.3k
Sep 9, 2024 No storm report 1,606 25% 5.0 h 5.2 h 6.2k
Oct 30, 2017 Windstorm 1,963 30% 3.0 h 3.0 h 5.9k
Dec 5, 2016 No storm report 1,567 24% 5.0 h 5.0 h 5.7k
Oct 25, 2022 No storm report 640 10% 8.0 h 7.5 h 4.3k
Oct 7, 2024 No storm report 1,607 25% 3.5 h 48 min 4.2k
Oct 22, 2025 No storm report 741 11% 10 h 5.2 h 4.1k

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 +6h 90% by +6h

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

  • No storm on record 46%
  • Flooding 34%
  • Windstorm 18%
  • Tropical storm 1.6%

Who keeps the lights on

Utilities serving Nantucket

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
Nantucket Electric Co Investor Owned 103 103 0.97 35.9 13k

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.

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 6,451 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 →