Electric Substations in New Hampshire
46 named substations in New Hampshire, with the highest-voltage facilities listed first. Each substation profile shows voltage class, connected transmission lines, and the datacenter candidate sites closest to it.
At a glance
How is New Hampshire's substation network split by voltage?
By maximum voltage, the named substations break down as 9 at 345–499 kV; 7 at 230–344 kV; 18 at 115–229 kV; 1 below 69 kV; 11 withvoltage not recorded. 20% of New Hampshire's named substations operate at 345 kV or above, against 8% across all 16,654 named US substations. The state median of 115 kV is level with the national median of 115 kV.
How does New Hampshire compare with other states?
New Hampshire ranks 43rd of 50 states and DC by number of named substations and 40th by named substations at 345 kV or above. It also has 539 scored datacenter candidate sites with an average DC Readiness score of 54.5 (national average 53), and an average power sub-score of 35.2 against 37.4 nationally. Most of those sites (539) are in the ISO-NE market.
Which substations in New Hampshire have the highest voltage?
| Substation | Max voltage | Connected lines | Line owner |
|---|---|---|---|
| MONROE | 450 kV | 4 | PUBLIC SERVICE CO OF NH |
| AMHERST | 345 kV | 2 | PUBLIC SERVICE CO OF NH |
| DEERFIELD | 345 kV | 7 | PUBLIC SERVICE CO OF NH |
| EAGLE | 345 kV | 6 | PUBLIC SERVICE CO OF NH |
| FITZWILLIAM | 345 kV | 5 | PUBLIC SERVICE CO OF NH |
| LAWRENCE ROAD | 345 kV | 3 | PUBLIC SERVICE CO OF NH |
| NEWINGTON 345KV | 345 kV | 4 | PUBLIC SERVICE CO OF NH |
| SCOBIE POND 345KV | 345 kV | 9 | PUBLIC SERVICE CO OF NH |
| TIMBER SWAMP | 345 kV | 2 | PUBLIC SERVICE CO OF NH |
| BEDFORD | 230 kV | 2 | PUBLIC SERVICE CO OF NH |
| LITCHFIELD | 230 kV | 5 | PUBLIC SERVICE CO OF NH |
| LITTLETON | 230 kV | 5 | PUBLIC SERVICE CO OF NH |
| LITTLETON | 230 kV | 4 | PUBLIC SERVICE CO OF NH |
| MAMMOTH ROAD | 230 kV | 2 | PUBLIC SERVICE CO OF NH |
| MERRIMACK | 230 kV | 7 | PUBLIC SERVICE CO OF NH |
| WATTS BROOK | 230 kV | 3 | PUBLIC SERVICE CO OF NH |
| BRENTWOOD | 115 kV | 2 | PUBLIC SERVICE CO OF NH |
| BRIDGE STREET LOWER | 115 kV | 2 | PUBLIC SERVICE CO OF NH |
| CHESTER | 115 kV | 2 | PUBLIC SERVICE CO OF NH |
| DOVER | 115 kV | 2 | PUBLIC SERVICE CO OF NH |
| GREGGS | 115 kV | 8 | PUBLIC SERVICE CO OF NH |
| HUDSON | 115 kV | 4 | PUBLIC SERVICE CO OF NH |
| KEENE | 115 kV | 3 | PUBLIC SERVICE CO OF NH |
| MADBURY | 115 kV | 3 | PUBLIC SERVICE CO OF NH |
| MONADNOCK | 115 kV | 4 | PUBLIC SERVICE CO OF NH |
| NEWINGTON 115KV | 115 kV | 6 | PUBLIC SERVICE CO OF NH |
| OCEAN ROAD | 115 kV | 4 | PUBLIC SERVICE CO OF NH |
| PELHAM | 115 kV | 2 | PUBLIC SERVICE CO OF NH |
| POWER STREET | 115 kV | 8 | PUBLIC SERVICE CO OF NH |
| SCOBIE | 115 kV | 2 | PUBLIC SERVICE CO OF NH |
| SCOBIE POND 115KV | 115 kV | 10 | PUBLIC SERVICE CO OF NH |
| SOUTH MILFORD | 115 kV | 1 | PUBLIC SERVICE CO OF NH |
| SWANZEY | 115 kV | 2 | PUBLIC SERVICE CO OF NH |
| WESTPORT | 115 kV | 2 | PUBLIC SERVICE CO OF NH |
| WOODSVILLE | 46 kV | 1 | — |
| ASH STREET | — | 0 | PUBLIC SERVICE CO OF NH |
| BRIDGE STREET UPPER | — | 0 | — |
| BROAD STREET | — | 1 | PUBLIC SERVICE CO OF NH |
| EAGLE | — | 0 | — |
| FRONT STREET | — | 0 | — |
| JAFFREY | — | 0 | — |
| MILFORD | — | 0 | — |
| NOOKSETT HYDRO | — | 0 | — |
| SIMON STREET | — | 0 | — |
| SOUTH MANCHESTER | — | 0 | — |
| UNH 1 & UNH 2 | — | 0 | — |
Every named substation in New Hampshire
All 46 named substations, grouped by voltage band.
345–499 kV · 9
115–229 kV · 18
below 69 kV · 1
Frequently asked questions
How many electric substations are in New Hampshire?
HIFLD records 217 substations in New Hampshire, of which 46 carry a station name. That is the 43rd-most named substations of any state in the dataset.
What is the highest-voltage substation in New Hampshire?
MONROE is the highest-voltage named substation in New Hampshire, at 450 kV.
Which substation in New Hampshire connects the most transmission lines?
SCOBIE POND 115KV has the most connected transmission lines of the named substations listed here, with 10 at up to 115 kV.
How many substations in New Hampshire are 345 kV or higher?
9 of 46 named substations (20%) operate at 345 kV or above, compared with 8% nationally. New Hampshire ranks 40th of 50 states and DC for named substations at that level.
How many datacenter candidate sites in New Hampshire are at substations?
83 of the 539 scored candidate sites in New Hampshire are substation sites — locations generated at an existing substation. Scored sites across New Hampshire average 54.5 on the 0–100 DC Readiness scale, against 53 nationally.
Looking for a specific record? The directory lists every substation in New Hampshire, A to Z.
More on New Hampshire, and states with similar counts
About this data
Source: HIFLD Electric Substations and Transmission Lines (U.S. Department of Homeland Security), as published June 29, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “Electric substations in New Hampshire”, https://gridcensus.com/substations/new-hampshire (data as of June 29, 2026).
Dataset updated . Screening estimates derived from public data sources.
Go deeper than the public screen
Every site and score for substations in New Hampshire is free to browse. Pro adds Watchtower on 25 sites, alerts when new candidate sites, datacenters or interconnection-queue requests appear in your markets, score and capacity history, and CSV export. Enterprise adds team seats, weekly data files for all 147,272 sites, the REST API and an MCP server for AI tools.