County annual report · FIPS 33013
2025 Merrimack County, NH Power Outage Report
In 2025, customers in Merrimack County, NH went without power for an average of 2.6 hours, a total of 298K customer-hours (New Hampshire average 3.8 hours). That ranks 8th worst of 10 New Hampshire counties and 2205th of 3,000 nationally.
Compared with NH, the US and 2024
Coverage line is EAGLE-I's share of New Hampshire customers tracked each year.
Biggest outages in Merrimack County, 2025
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 7, 2025 08:30 | March 9, 2025 00:00 | 1d 15h | 8,480 | 31K |
| 2 | June 19, 2025 20:45 | June 21, 2025 09:15 | 1d 12h | 5,686 | 27K |
| 3 | June 24, 2025 21:00 | June 25, 2025 06:15 | 9h 15m | 5,624 | 13K |
| 4 | December 29, 2025 07:45 | December 30, 2025 23:30 | 1d 15h | 4,904 | 45K |
| 5 | January 31, 2025 14:30 | January 31, 2025 16:45 | 2h 15m | 3,010 | 771 |
| 6 | January 31, 2025 00:45 | January 31, 2025 04:30 | 3h 45m | 3,009 | 3,702 |
| 7 | September 11, 2025 09:00 | September 11, 2025 14:15 | 5h 15m | 3,002 | 9,766 |
| 8 | July 25, 2025 18:00 | July 26, 2025 01:15 | 7h 15m | 2,781 | 2,644 |
| 9 | February 17, 2025 10:00 | February 18, 2025 23:00 | 1d 13h | 2,381 | 13K |
| 10 | May 15, 2025 17:00 | May 15, 2025 17:15 | 15m | 2,321 | 580 |
Outage episodes by size in 2025: 117 reached 100+ customers, 26 reached 1,000+ customers, 0 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 2025, 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 | 2024 | 13.1 hrs | 1.60 | 82 min | 0.74 |
| Unitil Energy Systems | 2024 | 9.9 hrs | 1.73 | 1.6 hrs | 1.00 |
| 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 n/a of New Hampshire's customers in 2025; 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, 2025, 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/2025/new-hampshire/merrimack-county