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

Power outage history

Rockingham County New Hampshire

6.2hours

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

7th most of 10 in New Hampshire close to the national median

Worst outage on record Oct 30, 2017 52% of customers out · 90% back in 2.4 days

Hours without power, average customer per year 6.2h / yr State average 6.9 h · national median 6.6 h

Major outages a year 1.5 Peaks over 10% of customers or 50,000 customers

Typical time to restore 90% 23hours Median across major outages, from the peak

Longest single outage 3.8days Oct 29, 2017, over 1% of customers out

Outage hours on storm days 76% Share falling on days with a NOAA storm report here

Worst year 2024 15 hours without power, average customer

Electricity customers 154,048 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 Rockingham'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

2024 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.

Rockingham, hours without power per customer

RockinghamUS 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
Oct 29, 2017	Windstorm	80,811	52%	3.8 d	2.4 d	2.2M
Apr 4, 2024	Winter storm	64,404	42%	3.6 d	2.1 d	1.8M
Dec 23, 2022	Windstorm	35,505	23%	2.5 d	36 h	622k
Mar 14, 2017	Winter storm	54,648	35%	27 h	23 h	538k
Mar 7, 2018	Winter storm	29,794	19%	46 h	34 h	513k
Jan 23, 2023	Winter storm	21,774	14%	2.0 d	23 h	418k
Dec 5, 2020	No storm report	18,613	12%	28 h	21 h	308k
Mar 14, 2023	Winter storm	16,849	11%	35 h	29 h	274k
Oct 17, 2019	Windstorm	22,977	15%	34 h	24 h	253k
Jul 23, 2016	Thunderstorms	38,471	25%	16 h	5.0 h	176k
Mar 1, 2021	No storm report	7,711	5%	40 h	30 h	154k
Mar 23, 2024	No storm report	8,520	6%	28 h	28 h	141k
Dec 18, 2023	Windstorm	15,872	10%	28 h	25 h	140k
Aug 4, 2020	Hurricane Isaias	9,933	6%	21 h	20 h	131k
Jun 18, 2018	Thunderstorms	26,513	17%	14 h	11 h	128k
Feb 7, 2020	No storm report	16,571	11%	21 h	18 h	128k
Mar 29, 2021	No storm report	12,591	8%	23 h	8.8 h	102k
Mar 7, 2025	No storm report	14,298	9%	13 h	9.5 h	76k
Mar 24, 2020	Winter storm	15,809	10%	8.8 h	7.2 h	54k
Feb 28, 2024	No storm report	6,928	5%	14 h	7.8 h	54k
Jul 18, 2016	Thunderstorms	7,519	5%	14 h	13 h	43k
Apr 1, 2017	Winter storm	13,437	9%	6.2 h	5.2 h	42k
Aug 9, 2024	Hurricane Debby	6,933	5%	6.8 h	30 min	42k
Apr 4, 2018	No storm report	5,719	4%	13 h	16 h	42k
May 17, 2025	No storm report	18,430	12%	2.5 h	7.2 h	38k
May 18, 2017	Thunderstorms	12,058	8%	5.0 h	3.0 h	36k
Feb 5, 2016	Winter storm	11,603	8%	5.5 h	1.0 h	32k
Sep 8, 2023	Thunderstorms	10,991	7%	3.5 h	3.2 h	25k
Jun 20, 2024	Heat	7,849	5%	5.2 h	8.5 h	25k
May 4, 2018	Thunderstorms	11,429	7%	5.0 h	6.0 h	23k

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

Winter storm 51%
No storm on record 24%
Windstorm 17%
Thunderstorms 4.3%
Tropical storm 3.2%

Who keeps the lights on

Utilities serving Rockingham

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
Unitil Energy Systems	Investor Owned	98	91	1.36	21.7	69k
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

York, ME 30 h
Essex, MA 8.0 h
Rockingham (this county) 6.2 h
Strafford 5.1 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 154,048 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 →