AI data center sites in New Hampshire

10 New Hampshire counties scored on transmission, the interconnection queue, power price and tax. Updated October 18, 2026.

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Open a county for its queue requests, substations, plants and data centers.

#	Market	Score	Pipeline	Top kV	Power price	DCs
1	ISO-NE	38	-	345	18.2¢/kWh	-
2	ISO-NE	30	-	450	18.2¢/kWh	-
3	ISO-NE	28	-	345	18.2¢/kWh	-
4	ISO-NE	26	-	230	18.2¢/kWh	-
5	Not identified	19	-	345	18.2¢/kWh	-
6	ISO-NE	12	20 MW	115	18.2¢/kWh	-
7	ISO-NE	12	-	115	18.2¢/kWh	-
8	ISO-NE	11	4 MW	115	18.2¢/kWh	-
9	ISO-NE	10	-	115	18.2¢/kWh	-
10	ISO-NE	5	-	-	18.2¢/kWh	-

Pipeline: active generation and storage requests in the ISO queue, or EIA planned plants where larger (outside the ISOs). Top kV: highest substation voltage. Power price: the state's industrial average. DCs: GPU colocation, mining sites and AI campuses.

What the data shows

The strongest New Hampshire counties for a large AI load are Rockingham County (38), Grafton County (30) and Hillsborough County (28) on the site score. New Hampshire sits in ISO-NE; its ISO queues hold 20 MW of active generation and storage requests, and it has 10 substations at 345 kV and up.

Industrial power averaged 18.2¢/kWh (EIA, July 2026 YTD), against 16.9¢/kWh a year earlier, the 44th lowest of the 50 states and DC. New Hampshire has no data center-specific sales tax exemption. We track 0 AI campuses and 0 GPU-ready colocation facilities here.

Top 6 counties in detail

1. Rockingham CountyISO-NE

Site score 38 of 100

Transmission: 22/25
Generation pipeline: 0/20
Industrial power price: 5/20
Existing and retiring plants: 11/15
Sales tax exemption: 0/10
Data center activity: 0/10

Market: ISO-NE
Queue (active): 0 MW
Agreement signed: 0 MW
Planned plants (EIA): 0 MW
Top substation: 345 kV
Substations 230 kV+: 8
Operating plants: 3.1 GW
Retired or retiring: 150 MW
Industrial power, NH: 18.2¢/kWh
Sales tax exemption: None

Substations, 115 kV and up

SCOBIE POND 115KV · 13 lines345 kV
NEWINGTON 115KV · 8 lines345 kV
DEERFIELD · 7 lines345 kV
Unnamed · 3 lines345 kV
TIMBER SWAMP · 2 lines345 kV
WATTS BROOK · 3 lines230 kV
MAMMOTH ROAD · 2 lines230 kV
GRANITE RIDGE · 2 lines230 kV

Planned, retiring and retired plants

Schiller · Coal, retired 2025150 MW

2. Grafton CountyISO-NE

Site score 30 of 100

Transmission: 20/25
Generation pipeline: 0/20
Industrial power price: 5/20
Existing and retiring plants: 5/15
Sales tax exemption: 0/10
Data center activity: 0/10

Market: ISO-NE
Queue (active): 0 MW
Agreement signed: 0 MW
Planned plants (EIA): 0 MW
Top substation: 450 kV
Substations 230 kV+: 4
Operating plants: 475 MW
Retired or retiring: 16 MW
Industrial power, NH: 18.2¢/kWh
Sales tax exemption: None

Substations, 115 kV and up

MONROE · 4 lines450 kV
MONROE · 8 lines230 kV
LITTLETON · 8 lines230 kV
LITTLETON · 4 lines230 kV
Unnamed · 3 lines115 kV
Unnamed · 3 lines115 kV
Unnamed · 3 lines115 kV
Unnamed · 3 lines115 kV

3. Hillsborough CountyISO-NE

Site score 28 of 100

Transmission: 22/25
Generation pipeline: 0/20
Industrial power price: 5/20
Existing and retiring plants: 2/15
Sales tax exemption: 0/10
Data center activity: 0/10

Market: ISO-NE
Queue (active): 0 MW
Agreement signed: 0 MW
Planned plants (EIA): 0 MW
Top substation: 345 kV
Substations 230 kV+: 6
Operating plants: 63 MW
Retired or retiring: 0 MW
Industrial power, NH: 18.2¢/kWh
Sales tax exemption: None

Substations, 115 kV and up

EAGLE · 4 lines345 kV
LAWRENCE ROAD · 2 lines345 kV
AMHERST · 2 lines345 kV
LITCHFIELD · 5 lines230 kV
Unnamed · 3 lines230 kV
BEDFORD · 2 lines230 kV
GREGGS · 7 lines115 kV
POWER STREET · 6 lines115 kV

4. Merrimack CountyISO-NE

Site score 26 of 100

Transmission: 12/25
Generation pipeline: 0/20
Industrial power price: 5/20
Existing and retiring plants: 9/15
Sales tax exemption: 0/10
Data center activity: 0/10

Market: ISO-NE
Queue (active): 0 MW
Agreement signed: 0 MW
Planned plants (EIA): 0 MW
Top substation: 230 kV
Substations 230 kV+: 2
Operating plants: 550 MW
Retired or retiring: 459 MW
Industrial power, NH: 18.2¢/kWh
Sales tax exemption: None

Substations, 115 kV and up

MERRIMACK · 6 lines230 kV
Unnamed · 3 lines230 kV
Unnamed · 5 lines115 kV
Unnamed · 3 lines115 kV

Planned, retiring and retired plants

Merrimack · Coal, retiring 2027459 MW

5. Cheshire CountyNot identified

Site score 19 of 100

Transmission: 14/25
Generation pipeline: 0/20
Industrial power price: 5/20
Existing and retiring plants: 0/15
Sales tax exemption: 0/10
Data center activity: 0/10

Market: Not identified
Queue (active): 0 MW
Agreement signed: 0 MW
Planned plants (EIA): 0 MW
Top substation: 345 kV
Substations 230 kV+: 1
Operating plants: 0 MW
Retired or retiring: 0 MW
Industrial power, NH: 18.2¢/kWh
Sales tax exemption: None

Substations, 115 kV and up

FITZWILLIAM · 5 lines345 kV
MONADNOCK · 4 lines115 kV
KEENE · 3 lines115 kV
Unnamed · 3 lines115 kV
WESTPORT · 2 lines115 kV
SWANZEY · 2 lines115 kV
SCOBIE · 2 lines115 kV

6. Strafford CountyISO-NE

Site score 12 of 100

Transmission: 4/25
Generation pipeline: 2/20
Industrial power price: 5/20
Existing and retiring plants: 1/15
Sales tax exemption: 0/10
Data center activity: 0/10

Market: ISO-NE
Queue (active): 20 MW
Agreement signed: 0 MW
Planned plants (EIA): 20 MW
Top substation: 115 kV
Substations 230 kV+: 0
Operating plants: 23 MW
Retired or retiring: 2 MW
Industrial power, NH: 18.2¢/kWh
Sales tax exemption: None

Largest queue requests

Project	Point of interconnection	MW	Type	Stage
Nutes SolarISO-NE 1136, in service 2026-10	43°23'7.50"N, 71° 1'23.45"W, Direct Tap, Circuit #3174 34.5 kV	20	Solar	In study

Substations, 115 kV and up

MADBURY · 3 lines115 kV
Unnamed · 3 lines115 kV
DOVER · 2 lines115 kV

Planned, retiring and retired plants

Nutes Solar · Solar, planned 202620 MW

Data center tax exemption in New Hampshire

New Hampshire levies no general state sales tax, so no sales tax exemption applies to data centers.

Source: New Hampshire Department of Revenue Administration, accessed 2026-10-17. General information, not tax advice; ask your tax advisor.

How the score works

Six parts out of 100: transmission (25), generation in the queue (20), the state's industrial power price (20), existing and retiring plants (15), sales tax exemption (10) and data center activity (10). The site finder's methodology prints each formula and every source with its date. Markets: ISO New England.

Discuss a transaction

Funding a data center or the GPUs going into one in New Hampshire? Tell us about the site and the capital you need, and we will come back with the lenders and the structure that fit. Operators raising debt for a cluster can start at gpulenders.com.

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