massoutage

2021 New Hampshire Power Outage Report

In 2021, the average New Hampshire customer went without power for about 3.4 hours — the 30th worst of any US state that year, below the state's decade average. Figures from DOE/ORNL EAGLE-I.

Avg hrs / customer
3.4
Peak customers out
12,591
Rank (worst state)
30th
Counties affected
10

New Hampshire outages over the decade

Average hours without power per customer, 2021 highlighted.

2.3h20153.2h201614.3h20175.8h20183.3h20197.1h20203.4h20218.6h20229.5h202314.2h20243.8h2025

Hardest-hit New Hampshire counties in 2021

By peak customers out during the year's worst event.

1Rockingham County12,5912Merrimack County12,5333Hillsborough County12,0034Coos County9,6925Strafford County7,7696Grafton County7,7447Carroll County6,9688Belknap County6,1709Cheshire County5,87510Sullivan County2,795

Biggest New Hampshire outages of 2021

CountyBeganPeak customers out
Rockingham CountyMarch 29, 202112,591
Merrimack CountyMarch 29, 202112,533
Hillsborough CountyApril 8, 202112,003
Coos CountyJune 4, 20219,692
Hillsborough CountyMarch 1, 20219,065
Rockingham CountySeptember 21, 20218,916
Strafford CountyJune 30, 20217,769
Grafton CountyAugust 15, 20217,744
Rockingham CountyMarch 2, 20217,711
Coos CountyMarch 2, 20217,004
New Hampshire by year:20252024202320222020201920182017
Other states in 2021:LAMIWVTXORMS

Part of the 2021 US Power Outage Report. Source: DOE/ORNL EAGLE-I. “Avg hours per customer” is a SAIDI-like measure (outage customer-minutes ÷ tracked customers); coverage varies by year.