– 0% of Sullivan out 0 customers out in New Hampshire

Power outage history

Sullivan County New Hampshire

13hours

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

3rd most of 10 in New Hampshire 2.0× the national median

Worst outage on record Jul 19, 2015 99% of customers out · 90% back in 23 hours

Hours without power, average customer per year 13h / yr State average 6.9 h · national median 6.6 h

Major outages a year 6.8 Peaks over 10% of customers or 50,000 customers

Typical time to restore 90% 5hours Median across major outages, from the peak

Longest single outage 3.8days Oct 30, 2017, over 1% of customers out

Outage hours on storm days 58% Share falling on days with a NOAA storm report here

Worst year 2022 19 hours without power, average customer

Electricity customers 20,079 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 Sullivan'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 19 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Sullivan, hours without power per customer

SullivanUS median countyNew Hampshire 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
Jul 19, 2015	Thunderstorms	19,880	99%	32 h	23 h	252k
Nov 26, 2018	Winter storm	7,999	40%	2.8 d	43 h	192k
Mar 14, 2023	Winter storm	9,262	46%	2.6 d	9.8 h	186k
Oct 30, 2017	Windstorm	5,190	26%	3.8 d	2.3 d	171k
Dec 16, 2022	Winter storm	8,776	44%	45 h	28 h	169k
Aug 4, 2020	Hurricane Isaias	6,019	30%	2.3 d	40 h	122k
Nov 1, 2019	No storm report	4,560	23%	44 h	28 h	82k
Apr 3, 2024	Winter storm	4,265	21%	2.7 d	44 h	79k
Mar 30, 2025	Winter storm	4,740	24%	38 h	6.0 h	54k
Dec 23, 2022	No storm report	2,990	15%	2.2 d	38 h	47k
Dec 29, 2025	Winter storm	5,909	29%	32 h	2.5 h	46k
Apr 16, 2018	No storm report	3,215	16%	27 h	12 h	45k
Nov 30, 2022	No storm report	4,515	22%	19 h	16 h	41k
Jul 23, 2016	Thunderstorms	4,369	22%	25 h	4.2 h	41k
Dec 18, 2023	No storm report	5,168	26%	28 h	4.8 h	37k
Mar 23, 2024	Winter storm	3,205	16%	46 h	33 h	35k
May 16, 2022	Tornadoes	3,155	16%	12 h	8.0 h	29k
Jan 13, 2024	No storm report	2,538	13%	15 h	10 h	27k
Dec 5, 2020	No storm report	2,942	15%	29 h	24 h	25k
Aug 3, 2015	Thunderstorms	2,929	15%	18 h	14 h	23k
May 4, 2018	Tornadoes	1,885	9%	23 h	21 h	23k
Jan 9, 2019	Winter storm	4,534	23%	15 h	6.5 h	23k
Nov 28, 2024	Winter storm	4,420	22%	12 h	7.5 h	21k
Feb 29, 2024	No storm report	4,585	23%	12 h	6.5 h	18k
Mar 1, 2021	No storm report	2,795	14%	27 h	7.8 h	18k
Apr 4, 2018	No storm report	2,124	11%	24 h	1.2 h	17k
Sep 7, 2023	Thunderstorms	2,778	14%	10 h	10 h	13k
Jun 20, 2025	No storm report	4,516	22%	8.0 h	4.5 h	13k
Mar 10, 2024	No storm report	1,507	8%	14 h	8.0 h	11k
Aug 4, 2022	Thunderstorms	3,407	17%	8.5 h	6.5 h	11k

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

Winter storm 44%
No storm on record 42%
Tropical storm 7.0%
Thunderstorms 4.2%
Tornadoes 2.7%

Who keeps the lights on

Utilities serving Sullivan

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

Utility	Type	Outage min / yr	Excl. major storms	Outages / yr	Residential ¢/kWh	Customers
Public Service Co of NH	Investor Owned	161	83	1.09	24.2	464k
New Hampshire Elec Coop Inc	Cooperative	874	526	4.05	24.7	75k
Liberty Utilities (Granite State Electri	Investor Owned	125	109	1.07	22.6	40k

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

Windham, VT 37 h
Windsor, VT 15 h
Sullivan (this county) 13 h
Cheshire 11 h
Grafton 8.0 h
Merrimack 5.0 h
Hillsborough 4.6 h

Across New Hampshire

Where it is darkest

Hours / yr64+

All New Hampshire 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 20,079 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 →