New Hampshire has approximately 338 miles of natural gas transmission pipeline operated by 7 companies. Most of the network is intrastate — built and operated inside New Hampshire — with interstate trunk lines bringing gas in from out-of-state production basins. PNGTS/Maritimes & Northeast is the largest operator with 87 miles (25.7% of the state total).
The interactive map below shows every interstate and intrastate transmission pipeline in New Hampshire from the U.S. Energy Information Administration dataset. Click any pipeline for the operating company, type, and status. To compare New Hampshire to the rest of the country, see the national US natural gas pipelines map.
New Hampshire Natural Gas Pipeline Network at a Glance
8 mi (2.4%) is intrastate — gas moving between fields, storage, and consumers inside New Hampshire — and 330 mi (97.6%) is interstate, carrying gas across New Hampshire’s borders. Every pipeline segment in the EIA dataset is currently flagged Operating; idled and retired transmission lines are not reported in the public data.
| Type | Miles | Segments | Share |
|---|---|---|---|
| Intrastate | 8 | 3 | 2.4% |
| Interstate | 330 | 42 | 97.6% |
- 45 total pipeline segments covering ~338 miles (EIA transmission dataset)
- 7 distinct operators own and run transmission infrastructure inside New Hampshire
- 8 miles intrastate (2.4%), 330 miles interstate (97.6%)
- The largest operator, PNGTS/Maritimes & Northeast, accounts for 25.7% of New Hampshire’s transmission mileage
- The two largest operators control about 51.4% of the state’s pipeline miles between them
Pipeline Operators in New Hampshire
PNGTS/Maritimes & Northeast runs the largest share of New Hampshire’s natural gas transmission network, with 87 mi of pipeline across 3 segments. Below are the top operators ranked by pipeline length inside New Hampshire. “Type” indicates whether the operator runs interstate trunk lines, intrastate distribution-class transmission, or both.
| Rank | Operator | Type | Approx. miles | Segments | Share |
|---|---|---|---|---|---|
| 1 | PNGTS/Maritimes & Northeast | Interstate | 87 | 3 | 25.7% |
| 2 | Granite State Gas Trans Co | Interstate | 87 | 22 | 25.7% |
| 3 | Portland Natural Gas PL | Interstate | 76 | 1 | 22.5% |
| 4 | Tennessee Gas Pipeline | Interstate | 44 | 5 | 13.0% |
| 5 | EnergyNorth Nat Gas Co | Interstate | 34 | 10 | 10.2% |
| 6 | Northern Utilities (ME) | Intrastate | 8 | 3 | 2.4% |
| 7 | Maritimes & Northeast PL US | Interstate | 1 | 1 | 0.4% |
How Natural Gas Crosses New Hampshire’s Borders
New Hampshire connects to neighbouring states through these interstate pipelines — visible as blue segments on the map:
- PNGTS/Maritimes & Northeast — 87 mi inside New Hampshire (3 segments).
- Granite State Gas Trans Co — 87 mi inside New Hampshire (22 segments).
- Portland Natural Gas PL — 76 mi inside New Hampshire (1 segments).
- Tennessee Gas Pipeline — 44 mi inside New Hampshire (5 segments).
- EnergyNorth Nat Gas Co — 34 mi inside New Hampshire (10 segments).
- Maritimes & Northeast PL US — 1 mi inside New Hampshire (1 segments).
About the Data on This Map
This map shows interstate and intrastate natural gas transmission pipelines — the high-pressure trunk lines that move gas between production areas, storage, and city gates. It does not show gathering lines (which collect gas from individual wells) or local distribution mains (which carry gas the last mile to homes and businesses).
Pipeline geometries and operator information come from the U.S. Energy Information Administration via its public ArcGIS REST FeatureServer. Per-state stats on this page are computed by intersecting that dataset with the New Hampshire state polygon (Census TIGERweb) and summing the intersected segments using haversine distance on the source line geometries. Pipeline diameter, installation year, and capacity are not included in the public dataset. Pipelines that cross New Hampshire’s borders are shown in their entirety inside the state polygon, so segments visible on this map may extend into neighbouring states.
Compare New Hampshire to Other States
Use the national US natural gas pipelines map to compare New Hampshire’s pipeline network to every other state — including total mileage, operator concentration, and the interstate/intrastate split.
