County annual report · FIPS 33013
2020 Merrimack County, NH Power Outage Report
In 2020, customers in Merrimack County, NH went without power for an average of 5.2 hours, a total of 605K customer-hours (New Hampshire average 7.1 hours). That ranks 8th worst of 10 New Hampshire counties and 1360th of 3,019 nationally.
Compared with NH, the US and 2019
Coverage line is EAGLE-I's share of New Hampshire customers tracked each year.
Biggest outages in Merrimack County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | August 4, 2020 20:30 | August 8, 2020 00:45 | 3d 4h | 10,558 | 180K |
| 2 | December 5, 2020 17:30 | December 9, 2020 20:15 | 4d 2h | 8,559 | 187K |
| 3 | February 7, 2020 20:45 | February 9, 2020 07:15 | 1d 10h | 8,054 | 56K |
| 4 | January 11, 2020 15:30 | January 11, 2020 20:00 | 4h 30m | 6,104 | 3,640 |
| 5 | September 10, 2020 13:15 | September 11, 2020 01:30 | 12h 15m | 4,748 | 6,272 |
| 6 | January 12, 2020 15:45 | January 13, 2020 07:00 | 15h 15m | 3,580 | 6,731 |
| 7 | May 9, 2020 13:00 | May 10, 2020 01:30 | 12h 30m | 3,322 | 2,768 |
| 8 | August 25, 2020 15:15 | August 26, 2020 06:00 | 14h 45m | 2,868 | 1,845 |
| 9 | March 23, 2020 18:30 | March 24, 2020 22:45 | 1d 4h | 2,534 | 16K |
| 10 | September 30, 2020 07:15 | September 30, 2020 23:45 | 16h 30m | 2,521 | 5,009 |
Outage episodes by size in 2020: 143 reached 100+ customers, 22 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 2020, 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 | 2020 | 7.7 hrs | 1.49 | 1.6 hrs | 0.81 |
| Unitil Energy Systems | 2020 | 2.9 hrs | 1.86 | 2.0 hrs | 1.60 |
| 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 2020; 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, 2020, 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/2020/new-hampshire/merrimack-county