County annual report · FIPS 33013
2021 Merrimack County, NH Power Outage Report
In 2021, customers in Merrimack County, NH went without power for an average of 1.9 hours, a total of 224K customer-hours (New Hampshire average 3.4 hours). That ranks 10th worst of 10 New Hampshire counties and 2243rd 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 Merrimack 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 08:00 | March 31, 2021 05:30 | 1d 21h | 12,533 | 48K |
| 2 | March 2, 2021 00:45 | March 4, 2021 13:15 | 2d 12h | 5,988 | 44K |
| 3 | April 23, 2021 15:00 | April 23, 2021 18:45 | 3h 45m | 5,221 | 2,815 |
| 4 | March 14, 2021 21:00 | March 14, 2021 21:15 | 15m | 2,724 | 681 |
| 5 | January 21, 2021 14:00 | January 21, 2021 18:30 | 4h 30m | 2,499 | 991 |
| 6 | April 5, 2021 17:15 | April 5, 2021 18:45 | 1h 30m | 2,212 | 580 |
| 7 | September 6, 2021 05:30 | September 6, 2021 07:45 | 2h 15m | 2,202 | 1,641 |
| 8 | March 13, 2021 01:15 | March 13, 2021 18:15 | 17h | 2,189 | 7,708 |
| 9 | December 12, 2021 03:45 | December 12, 2021 20:15 | 16h 30m | 2,080 | 7,464 |
| 10 | September 22, 2021 12:45 | September 22, 2021 15:00 | 2h 15m | 1,957 | 492 |
Outage episodes by size in 2021: 115 reached 100+ customers, 19 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 Merrimack 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 |
| 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 ÷ 115,899 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. Merrimack County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Merrimack 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/merrimack-county