County annual report · FIPS 33009
2021 Grafton County, NH Power Outage Report
In 2021, customers in Grafton County, NH went without power for an average of 3.5 hours, a total of 175K customer-hours (New Hampshire average 3.4 hours). That ranks 6th worst of 10 New Hampshire counties and 1677th 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 Grafton 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 | August 15, 2021 15:15 | August 15, 2021 19:15 | 4h | 7,744 | 17K |
| 2 | June 30, 2021 18:30 | July 1, 2021 18:30 | 1d | 4,630 | 9,127 |
| 3 | March 29, 2021 11:30 | April 1, 2021 14:00 | 3d 2h | 3,107 | 29K |
| 4 | January 16, 2021 14:45 | January 17, 2021 05:45 | 15h | 2,079 | 7,313 |
| 5 | February 9, 2021 21:45 | February 9, 2021 23:00 | 1h 15m | 1,897 | 1,423 |
| 6 | May 23, 2021 17:00 | May 23, 2021 22:30 | 5h 30m | 1,846 | 5,090 |
| 7 | December 6, 2021 07:30 | December 7, 2021 17:15 | 1d 9h | 1,740 | 4,596 |
| 8 | July 13, 2021 10:00 | July 13, 2021 15:45 | 5h 45m | 1,617 | 852 |
| 9 | June 28, 2021 23:30 | June 29, 2021 13:30 | 14h | 1,497 | 537 |
| 10 | July 2, 2021 11:30 | July 2, 2021 19:00 | 7h 30m | 1,481 | 2,550 |
Outage episodes by size in 2021: 107 reached 100+ customers, 18 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 Grafton 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 |
| New Hampshire Elec Coop Inc | - | - | - | - | - |
| Precinct of Woodsville | - | - | - | - | - |
| Town of Ashland | - | - | - | - | - |
| Town of Littleton - (NH) | - | - | - | - | - |
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 ÷ 49,895 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. Grafton County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Grafton 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/grafton-county