County annual report · FIPS 33015
2021 Rockingham County, NH Power Outage Report
In 2021, customers in Rockingham County, NH went without power for an average of 3.4 hours, a total of 518K customer-hours (New Hampshire average 3.4 hours). That ranks 7th worst of 10 New Hampshire counties and 1720th of 2,974 nationally.
Compared with NH, the US and 2020
Coverage line is EAGLE-I's share of New Hampshire customers tracked each year.
Biggest outages in Rockingham County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | March 29, 2021 11:45 | March 31, 2021 02:00 | 1d 14h | 12,591 | 109K |
| 2 | September 21, 2021 23:45 | September 23, 2021 09:30 | 1d 9h | 8,916 | 19K |
| 3 | March 2, 2021 03:15 | March 4, 2021 18:00 | 2d 14h | 7,711 | 160K |
| 4 | October 26, 2021 18:45 | October 28, 2021 02:30 | 1d 7h | 6,546 | 23K |
| 5 | July 27, 2021 22:45 | July 28, 2021 06:45 | 8h | 3,744 | 16K |
| 6 | December 12, 2021 04:45 | December 12, 2021 17:30 | 12h 45m | 3,705 | 9,835 |
| 7 | June 30, 2021 20:15 | July 2, 2021 01:15 | 1d 5h | 3,529 | 29K |
| 8 | March 13, 2021 02:30 | March 13, 2021 13:30 | 11h | 2,846 | 8,250 |
| 9 | July 2, 2021 08:30 | July 2, 2021 20:30 | 12h | 2,672 | 1,819 |
| 10 | February 6, 2021 13:15 | February 6, 2021 19:00 | 5h 45m | 1,774 | 556 |
Outage episodes by size in 2021: 149 reached 100+ customers, 20 reached 1,000+ customers, 1 reached 10,000+ customers.
Utility reliability filed with the EIA
SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving Rockingham County reported on EIA Form 861 for 2021, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| Public Service Co of NH | 2021 | 3.0 hrs | 1.07 | 1.6 hrs | 0.83 |
| Liberty Utilities (Granite State Electri | 2021 | 2.8 hrs | 1.04 | 1.8 hrs | 0.85 |
| Unitil Energy Systems | 2021 | 2.3 hrs | 1.33 | 1.7 hrs | 1.04 |
| New Hampshire Elec Coop Inc | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 99% of New Hampshire's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 154,048 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
- An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
- Years loaded: 2015–2025. Rockingham County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Rockingham County, NH annual power outage report, 2021, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2021/new-hampshire/rockingham-county