Power Out Map
– 0 customers out in New Hampshire

Power outage history

New Hampshire

6.9hours

without power for the average customer in a typical year, 2018–2025. 17th of 51.

Largest outage on record Windstorm, October 30, 2017 250,026 customers out · 34% of the state
Electricity customers 744,556 Across 10 counties
Worst well-recorded year 2024 14 hours without power, average customer

County by county

Where New Hampshire goes dark

Hours without power for the average customer in a typical year. Hover a county; click to open it.

Fewer hours64+ h / yr

Most hours without power

  1. 1Carroll23 h
  2. 2Belknap14 h
  3. 3Sullivan13 h
  4. 4Cheshire11 h
  5. 5Grafton8.0 h
  6. 6Coos6.3 h
  7. 7Rockingham6.2 h
  8. 8Strafford5.1 h
  9. 9Merrimack5.0 h
  10. 10Hillsborough4.6 h

Most reliable

  1. 1Hillsborough4.6 h
  2. 2Merrimack5.0 h
  3. 3Strafford5.1 h
  4. 4Rockingham6.2 h
  5. 5Coos6.3 h

Year by year

Hours in the dark, statewide

0 5 10 15 20 ’15 ’16 ’17 5.7 ’18 3.3 ’19 7.0 ’20 3.4 ’21 8.6 ’22 9.5 ’23 14 ’24 3.7 ’25 US 6.6

The record

New Hampshire's largest outages

Statewide events with at least 2% of customers, or 25,000, out at once, by peak.

BeganStormPeak outShare
Oct 30, 2017 Windstorm 250,026 33.6%
Apr 4, 2024 Winter storm 182,958 24.6%
Dec 23, 2022 Flooding 134,259 18.0%
Aug 4, 2020 Hurricane Isaias 94,383 12.7%
Jul 23, 2016 Thunderstorms 92,168 12.4%
Mar 14, 2023 Winter storm 84,493 11.3%
Mar 23, 2024 Winter storm 83,513 11.2%
Jan 23, 2023 Winter storm 78,545 10.5%
Jun 18, 2018 Thunderstorms 77,817 10.4%
Dec 17, 2022 Winter storm 67,375 9.0%
Dec 5, 2020 Winter storm 63,867 8.6%
Mar 14, 2017 Winter storm 61,720 8.3%

Every county

All 10 counties

CountyHours / yrMajor outages since 2018Customers
Carroll 23 47 26,009
Belknap 14 35 32,434
Sullivan 13 54 20,079
Cheshire 11 18 36,014
Grafton 8.0 20 49,895
Coos 6.3 19 24,038
Rockingham 6.2 12 154,048
Strafford 5.1 7 89,738
Merrimack 5.0 7 115,899
Hillsborough 4.6 5 196,402

Who keeps the lights on

Utilities in New Hampshire

Reliability and residential price as reported to the EIA for the latest year. Outage minutes include major storm days.

UtilityTypeOutage min / yrExcl. major storms¢/kWhCustomers
Public Service Co of NH Investor Owned 161 83 24.2 464k
New Hampshire Elec Coop Inc Cooperative 874 526 24.7 75k
Unitil Energy Systems Investor Owned 98 91 21.7 69k
Liberty Utilities (Granite State Electri Investor Owned 125 109 22.6 40k
Sunrun Inc. Behind the Meter – – 30.9 4.2k
Tesla Inc. Behind the Meter – – 18.1 1.2k