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

Power outage history

Hillsborough County New Hampshire

4.6hours

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

10th most of 10 in New Hampshire 30% below the national median

Worst outage on record Oct 30, 2017 30% of customers out · 90% back in 2.3 days

Hours without power, average customer per year 4.6h / yr State average 6.9 h · national median 6.6 h

Major outages a year 0.6 Peaks over 10% of customers or 50,000 customers

Typical time to restore 90% 30hours Median across major outages, from the peak

Longest single outage 2.9days Oct 29, 2017, over 1% of customers out

Outage hours on storm days 86% Share falling on days with a NOAA storm report here

Worst year 2023 10 hours without power, average customer

Electricity customers 196,402 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 Hillsborough'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

2023 was the worst well-recorded year, at 10 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Hillsborough, hours without power per customer

HillsboroughUS 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	58,016	30%	2.9 d	2.3 d	1.5M
Mar 14, 2023	Winter storm	29,343	15%	2.6 d	2.2 d	1.1M
Jan 23, 2023	Winter storm	22,819	12%	42 h	21 h	590k
Mar 23, 2024	Winter storm	16,635	8%	2.2 d	48 h	550k
Dec 23, 2022	Flooding	25,082	13%	2.1 d	30 h	492k
Apr 4, 2024	Winter storm	21,826	11%	38 h	31 h	469k
Mar 8, 2018	Winter storm	9,491	5%	2.6 d	2.6 d	265k
Aug 4, 2020	Hurricane Isaias	16,921	9%	27 h	25 h	222k
Dec 5, 2020	Winter storm	10,864	6%	31 h	25 h	219k
Jul 23, 2016	Thunderstorms	20,735	11%	18 h	4.8 h	156k
Dec 16, 2022	Winter storm	10,585	5%	29 h	26 h	144k
Jun 18, 2018	Thunderstorms	22,246	11%	17 h	16 h	143k
Apr 4, 2018	No storm report	16,030	8%	14 h	11 h	117k
Mar 24, 2020	Winter storm	18,919	10%	12 h	9.2 h	100k
Mar 1, 2021	No storm report	9,065	5%	21 h	19 h	93k
Mar 2, 2017	No storm report	15,026	8%	11 h	8.8 h	72k
May 4, 2018	Thunderstorms	11,162	6%	15 h	15 h	65k
Jul 16, 2024	Thunderstorms	17,370	9%	7.0 h	7.8 h	53k
Mar 7, 2025	No storm report	8,697	4%	9.2 h	15 h	52k
Feb 7, 2020	No storm report	8,023	4%	10 h	19 h	48k
Nov 1, 2019	No storm report	6,161	3%	14 h	8.5 h	45k
Oct 17, 2019	No storm report	5,367	3%	11 h	20 h	37k
Mar 29, 2021	No storm report	6,990	4%	7.5 h	9.8 h	29k
Sep 11, 2016	Thunderstorms	6,467	3%	7.0 h	14 h	29k
Mar 17, 2015	No storm report	10,751	5%	4.0 h	2.8 h	28k
Mar 7, 2022	Thunderstorms	12,171	6%	5.5 h	10 h	27k
Feb 25, 2019	No storm report	4,928	3%	8.2 h	–	25k
Jul 8, 2017	Thunderstorms	8,367	4%	5.5 h	6.8 h	25k
Dec 18, 2023	No storm report	4,214	2%	7.2 h	–	22k
Oct 31, 2025	No storm report	5,310	3%	5.0 h	9.2 h	20k

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

Winter storm 66%
No storm on record 14%
Flooding 9.4%
Thunderstorms 6.5%
Tropical storm 4.2%

Who keeps the lights on

Utilities serving Hillsborough

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
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

Sullivan 13 h
Cheshire 11 h
Essex, MA 8.0 h
Rockingham 6.2 h
Middlesex, MA 5.5 h
Merrimack 5.0 h
Hillsborough (this county) 4.6 h
Worcester, MA 4.0 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 196,402 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 →