How reliable is the power in New Hampshire?
New Hampshire ranks 14th of 45 states without major events and 38th with them (1st = fewest minutes), 45 below the U.S. 129 and 74 above the U.S. 662. Major events added 651 minutes, 89% of the with-events total. The figure covers 676,675 customers, 89% of the 760,402 EIA lists for New Hampshire.
New Hampshire with and without major events
minutes without power per customer, 2024, New Hampshire and U.S.
- 84New Hampshire, no major events
- 129U.S., no major events
- 736New Hampshire, with major events
- 662U.S., with major events
| Measure | New Hampshire without | New Hampshire with | U.S. without | U.S. with |
|---|---|---|---|---|
| SAIDI, minutes per customer | 84 | 736 | 129 | 662 |
| SAIFI, interruptions per customer | 0.78 | 1.62 | 1.06 | 1.53 |
| CAIDI, minutes per interruption | 109 | 455 | 122 | 433 |
| Median utility, SAIDI minutes | 93 | 593 | — | — |
Which New Hampshire utilities move the number
Public Service Co of NH serves 81% of the customers in the New Hampshire figure: 87% of lost customer-minutes with major events, 79% without. Without Public Service Co of NH, the weighted figure would be 512 minutes with major events and 96 without, against 736 and 84.
- Public Service Co of NH: 551,456 customers (81%), 82 min without and 786 with; 87% of lost minutes with major events, 79% without.
- Unitil Energy Systems: 79,654 customers (12%), 98 min without and 593 with; 9% of lost minutes with major events, 14% without.
- Liberty Utilities (Granite State Electri: 45,565 customers (7%), 93 min without and 370 with; 3% of lost minutes with major events, 7% without.
All New Hampshire utilities in the 2024 file
14 utilities in the 2024 EIA-861 files for New Hampshire: 3 follow IEEE 1366, 1 uses another method, 10 filed no reliability figures. 4 are listed.
| Public Service Co of NH | Investor Owned | IEEE 1366 | 551,456 | 82 | 786 | 0.74 | 1.60 | 90 | 1 of 3 | — |
|---|---|---|---|---|---|---|---|---|---|---|
| Liberty Utilities (Granite State Electri | Investor Owned | IEEE 1366 | 45,565 | 93 | 370 | 0.82 | 1.55 | 75 | 2 of 3 | — |
| Unitil Energy Systems | Investor Owned | IEEE 1366 | 79,654 | 98 | 593 | 1.00 | 1.73 | 84 | 3 of 3 | — |
| New Hampshire Elec Coop Inc | Cooperative | Other method | 85,138 | 515 | 2,410 | 2.65 | 5.24 | — | Not ranked | other method, not comparable |
New Hampshire utilities with no reliability figures
10 in the sales file, no SAIDI or SAIFI row.
| Utility | Type | Customers |
|---|---|---|
| Sunrun Inc. | Behind the Meter | 3,634 |
| Tesla Inc. | Behind the Meter | 1,205 |
| TerraForm US Energy Services, LLC | Behind the Meter | 1 |
| Town of Ashland | Municipal | — |
| First Point Power, LLC | Not stated | — |
| Texas Retail Energy, LLC | Not stated | — |
| Town of Wolfeboro - (NH) | Municipal | — |
| BP Energy Retail LLC | Not stated | — |
| Town of Littleton - (NH) | Municipal | — |
| Constellation NewEnergy, Inc | Not stated | — |
The biggest New Hampshire utilities against the U.S.
- Public Service Co of NH (investor owned, 71% of New Hampshire customers in the file): SAIDI without major events 82 min, 48 below the U.S. 129; with major events 786 min against 662.
- New Hampshire Elec Coop Inc (cooperative, 11% of New Hampshire customers in the file): reports on another method, SAIFI 5.24, not compared with the U.S. figure.
- Unitil Energy Systems (investor owned, 11% of New Hampshire customers in the file): SAIDI without major events 98 min, 32 below the U.S. 129; with major events 593 min against 662.
- Liberty Utilities (Granite State Electri (investor owned, 6% of New Hampshire customers in the file): SAIDI without major events 93 min, 37 below the U.S. 129; with major events 370 min against 662.
- Sunrun Inc. (behind the meter, 0% of New Hampshire customers in the file): no reliability figures filed.
Next to New Hampshire in the ranking
New Hampshire report card
Smart meters: 78% of residential meters, 3 utilities (U.S. 92%). New Hampshire time-based rates: 4 of 4 utilities, 0.1% of residential customers enrolled (U.S. 10.6%). New Hampshire efficiency spend: $79.9 per customer (U.S. $124.2). Demand response: 21 W per customer (U.S. 77). New Hampshire net-metered systems: 31.5 per 1,000 customers. Rankings.
Is your New Hampshire utility better or worse than the New Hampshire median?
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More
- New Hampshire against all states
- New Hampshire utilities among the best and worst
- New Hampshire major outage reports from the Department of Energy
- New Hampshire electricity prices
- New Hampshire help with your bill
4 New Hampshire filings in EIA-861 2024 (retrieved 2026-10-01), 3 ranked utilities. Method and sources.
Questions
How many minutes without power did the average New Hampshire customer have in 2024?
84 minutes without major events and 736 with them (3 IEEE 1366 utilities, customer-weighted).
Why do the two New Hampshire numbers differ so much?
Major events add 651 of the 736 minutes (89%); Public Service Co of NH supplies 87% of the with-events total.
Which New Hampshire utility reported the fewest and the most minutes?
Among 3 utilities with 10,000+ customers: Public Service Co of NH 82 minutes without major events, and Unitil Energy Systems 98.
Which New Hampshire utilities use which method?
3 follow IEEE 1366, 1 uses another method, 10 filed no reliability figures.