County annual report · FIPS 33013
2018 Merrimack County, NH Power Outage Report
In 2018, customers in Merrimack County, NH went without power for an average of 3.4 hours, a total of 398K customer-hours (New Hampshire average 5.8 hours). That ranks 9th worst of 10 New Hampshire counties and 1391st of 2,798 nationally.
Compared with NH, the US and 2017
Coverage line is EAGLE-I's share of New Hampshire customers tracked each year.
Biggest outages in Merrimack County, 2018
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | November 26, 2018 22:15 | November 30, 2018 22:45 | 4d | 9,908 | 137K |
| 2 | May 4, 2018 21:45 | May 7, 2018 19:45 | 2d 22h | 6,195 | 88K |
| 3 | April 4, 2018 23:45 | April 6, 2018 10:15 | 1d 10h | 4,579 | 24K |
| 4 | June 18, 2018 21:45 | June 20, 2018 01:45 | 1d 4h | 3,138 | 19K |
| 5 | July 10, 2018 18:45 | July 12, 2018 14:00 | 1d 19h | 2,791 | 19K |
| 6 | April 30, 2018 07:30 | April 30, 2018 17:00 | 9h 30m | 2,731 | 1,561 |
| 7 | March 20, 2018 15:30 | March 20, 2018 19:00 | 3h 30m | 2,260 | 893 |
| 8 | October 16, 2018 01:45 | October 17, 2018 03:00 | 1d 1h | 2,106 | 10K |
| 9 | April 13, 2018 14:30 | April 13, 2018 15:15 | 45m | 1,810 | 905 |
| 10 | April 23, 2018 21:45 | April 23, 2018 23:15 | 1h 30m | 1,807 | 2,711 |
Outage episodes by size in 2018: 99 reached 100+ customers, 13 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 2018, 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 | 2018 | 6.4 hrs | 1.88 | 2.0 hrs | 1.07 |
| Unitil Energy Systems | 2018 | 8.2 hrs | 1.94 | 1.9 hrs | 1.20 |
| 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 88% of New Hampshire's customers in 2018; 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, 2018, 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/2018/new-hampshire/merrimack-county