Power outages in New Hampshire
In 2025, the average New Hampshire customer was without power for 3.9 hours (231.3 minutes) over the year. That is below the US median of 4.3 hours (258.7 minutes) across the 50 states compared.
Trend
Yearly outage time has swung widely since 2020, from 3.9 hours in 2021 up to 10.8 hours in 2023. The worst year was 2024 at 15.4 hours, and 2025 dropped back to 3.9 hours.
Utilities in 2025
In 2025, Unitil Energy Systems had the lowest outage time at 1.6 hours (98.3 minutes) per customer. New Hampshire Elec Coop Inc had the highest at 14.6 hours (874.2 minutes).
| Utility | Customers | Hours / yr | Interruptions |
|---|---|---|---|
| New Hampshire Elec Coop Inc | 85,745 | 14.6 | 4.0 |
| Public Service Co of NH | 555,603 | 2.7 | 1.1 |
| Liberty Utilities (Granite State Electri | 48,072 | 2.1 | 1.1 |
| Unitil Energy Systems | 80,020 | 1.6 | 1.4 |
What this means for backup power
For everyday outages, enter 2.7 hours in the calculator, which is the average length of one interruption. To ride out a year like 2024, size for 15.4 hours, the total outage time for that year.
FAQ
How long does a typical power outage last in New Hampshire?
One interruption lasts 2.7 hours on average. This is different from the yearly total, which adds up all of a customer's outage time over 12 months.
How often do customers lose power in New Hampshire?
In 2025, the average customer had 1.4 interruptions (1.447). In 2024, the worst year, the figure was 2.0 (2.021).
How much backup power should I plan for?
Use 2.7 hours in the calculator to cover a typical single outage. If you want to cover a year as bad as 2024, plan for 15.4 hours of total outage time.
Utility pages
Source: U.S. EIA Form 861 Reliability file. Data snapshot 2026-11-05.