– 0% of Bristol out 0 customers out in Massachusetts

Power outage history

Bristol County Massachusetts

4.0hours

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

10th most of 14 in Massachusetts 40% below the national median

Worst outage on record Mar 2, 2018 25% of customers out · 90% back in 2.6 days

Hours without power, average customer per year 4.0h / yr State average 5.7 h · national median 6.6 h

Major outages a year 0.4 Peaks over 10% of customers or 50,000 customers

Typical time to restore 90% 39hours Median across major outages, from the peak

Longest single outage 3.3days Mar 2, 2018, over 1% of customers out

Outage hours on storm days 92% Share falling on days with a NOAA storm report here

Worst year 2018 12 hours without power, average customer

Electricity customers 284,254 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 Bristol'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 12 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Bristol, hours without power per customer

BristolUS median countyMassachusetts average

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
Mar 2, 2018	Windstorm	71,353	25%	3.3 d	2.6 d	2.8M
Oct 27, 2021	Tropical Storm Wanda	105,218	37%	32 h	32 h	1.2M
Oct 29, 2017	Windstorm	37,579	13%	44 h	33 h	846k
Dec 18, 2023	Windstorm	33,055	12%	2.2 d	46 h	692k
Aug 4, 2020	Hurricane Isaias	28,131	10%	25 h	22 h	289k
Oct 28, 2021	No storm report	20,256	7%	43 h	43 h	283k
Mar 13, 2018	Winter storm	19,219	7%	29 h	25 h	209k
Feb 5, 2016	Winter storm	16,431	6%	25 h	24 h	200k
Apr 13, 2020	Windstorm	17,163	6%	25 h	26 h	196k
Sep 30, 2020	Windstorm	15,337	5%	13 h	11 h	103k
Oct 7, 2020	Thunderstorms	23,577	8%	8.2 h	6.5 h	95k
Jul 22, 2016	Thunderstorms	20,547	7%	5.8 h	5.0 h	92k
Jul 4, 2025	No storm report	8,196	3%	16 h	29 h	90k
Mar 8, 2018	Windstorm	10,012	4%	9.8 h	9.2 h	76k
Nov 30, 2020	Windstorm	16,046	6%	11 h	15 h	76k
Feb 7, 2020	Windstorm	12,116	4%	9.5 h	20 h	65k
Jan 29, 2022	Winter storm	22,600	8%	8.5 h	6.0 h	60k
Aug 4, 2015	Thunderstorms	12,232	4%	8.2 h	6.5 h	56k
Dec 19, 2025	Windstorm	8,171	3%	8.2 h	13 h	51k
Jun 27, 2024	Thunderstorms	6,626	2%	10 h	14 h	50k
Oct 17, 2019	Windstorm	9,909	3%	5.5 h	5.8 h	38k
Dec 11, 2024	Windstorm	9,773	3%	5.8 h	10 h	28k
Aug 4, 2019	Thunderstorms	6,003	2%	6.5 h	13 h	27k
Nov 1, 2019	Windstorm	6,129	2%	6.0 h	13 h	23k
Feb 25, 2019	Windstorm	5,911	2%	4.2 h	5.0 h	19k
Mar 2, 2021	Windstorm	5,081	2%	6.0 h	9.0 h	18k
Jun 30, 2021	Thunderstorms	6,792	2%	3.8 h	3.0 h	18k
May 12, 2017	No storm report	15,363	5%	2.0 h	1.2 h	16k
Jul 7, 2025	No storm report	15,505	5%	1.2 h	1.5 h	15k
Jul 9, 2025	Flooding	6,248	2%	3.2 h	2.5 h	14k

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

Windstorm 62%
Tropical storm 22%
No storm on record 8.2%
Winter storm 4.2%
Thunderstorms 2.9%

Who keeps the lights on

Utilities serving Bristol

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
Massachusetts Electric Co	Investor Owned	133	91	1.00	33.7	1.2M
City of Taunton	Municipal	64	64	1.41	18.8	35k
Town of North Attleborough	Municipal	10	10	0.08	15.9	13k
Town of Mansfield	Municipal	21	10	0.07	15.0	9.4k

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

Plymouth 11 h
Bristol, RI 5.2 h
Norfolk 4.9 h
Providence, RI 4.5 h
Bristol (this county) 4.0 h
Newport, RI 2.0 h

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 284,254 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 →