NORTHPORT
SubstationNew York · LONG ISLAND POWER AUTHORITY
At a glance
NORTHPORT is an electric transmission substation in New York, on LONG ISLAND POWER AUTHORITY's transmission network. It is classified as sub-transmission (115 kv) and connects 6 transmission lines. Substation proximity is one of the strongest speed-to-power signals for siting a datacenter — interconnection distance to an energized, high-voltage bus is often the binding constraint on time-to-energization.
Voltage & classification
Ownership
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #120782 | 138 kV | LONG ISLAND POWER AUTHORITY | — | 0.1 mi |
| #125849 | 138 kV | LONG ISLAND POWER AUTHORITY | — | 0.2 mi |
| #129695 | 138 kV | LONG ISLAND POWER AUTHORITY | — | 0.1 mi |
| #135551 | 138 kV | LONG ISLAND POWER AUTHORITY | — | 0.2 mi |
| #157077 | 115 kV | LONG ISLAND POWER AUTHORITY | IN SERVICE | 11.8 mi |
| #157079 | — | LONG ISLAND POWER AUTHORITY | IN SERVICE | 3.2 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of NORTHPORT, ranked by DC Readiness. Sites this close to an energized substation carry a strong speed-to-power advantage.
| Site | Type | State | County | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|---|---|
| BRIDGEPORT RESCO | Substation-Adjacent | CT | Greater Bridgeport Planning Region | 345 kV | 600 MW | 4.3 yrs | 71.7 |
| DUFFY AVENUE CONVERTER STATION | Substation-Adjacent | NY | Nassau County | 500 kV | 1,000 MW | 4.3 yrs | 70.2 |
| SHORE RD | Substation-Adjacent | NY | Nassau County | 345 kV | 600 MW | 4.3 yrs | 68.8 |
| EAST GARDEN CITY | Substation-Adjacent | NY | Nassau County | 345 kV | 600 MW | 4.3 yrs | 67.6 |
| NEWBRIDGE ROAD | Substation-Adjacent | NY | Nassau County | 345 kV | 600 MW | 4.3 yrs | 67.3 |
| DEVON | Substation-Adjacent | CT | Greater Bridgeport Planning Region | 115 kV | 100 MW | 4.3 yrs | 65.0 |
| WATERSIDE | Substation-Adjacent | CT | Westchester County | 115 kV | 100 MW | 4.3 yrs | 63.9 |
| ELMWEST | Substation-Adjacent | CT | South Central Connecticut Planning Region | 115 kV | 100 MW | 4.3 yrs | 63.4 |
How does NORTHPORT compare with other substations in New York?
New York has 2,777 substation records in HIFLD, of which 570 carry a station name; the rest are unnamed tap points, risers and line ends. 261 named substations in the state are in NORTHPORT's 115–229 kV band (46% of named stations). 82 sit in a higher band. 56 named substations in New York operate at 345 kV or above. The highest voltage recorded in the state is 765 kV, and the state median is 115 kV.
Who owns the transmission lines at NORTHPORT?
The 6 connected lines listed above are owned by LONG ISLAND POWER AUTHORITY. Line voltages range from 115 kV to 138 kV. Their combined recorded length is about 15.5 miles.
How do candidate sites near NORTHPORT score?
The 8 highest-scoring candidate sites within about 25 miles range from 63 to 72 on the 0–100 DC Readiness scale. They fall in Greater Bridgeport Planning Region, Nassau County, Westchester County, South Central Connecticut Planning Region. The New York average across 2,980 scored sites is 54. 844 of those New York sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is NORTHPORT substation?
NORTHPORT has a maximum voltage of 115 kV. That places it in the 115–229 kV band. The median named US substation in this dataset is 115 kV, so NORTHPORT is at the national midpoint.
How many transmission lines connect to NORTHPORT substation?
6 transmission lines terminate at or pass through NORTHPORT in the HIFLD line data. The connected lines listed here run at 138 kV, 115 kV. Together the listed lines cover about 15.5 miles.
Who owns NORTHPORT substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at NORTHPORT belong to LONG ISLAND POWER AUTHORITY. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is NORTHPORT substation located?
NORTHPORT is in New York at 40.9233, -73.3411. The datacenter candidate sites closest to it are in Greater Bridgeport Planning Region, Nassau County, Westchester County.
Are there datacenter candidate sites near NORTHPORT substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of NORTHPORT. The highest-scoring is BRIDGEPORT RESCO at 72/100. Across New York, the average DC Readiness score is 54.
Other 115 kV substations in New York
- MORTIMER· 16 lines
- LOCKPORT· 15 lines
- WESTOVER· 13 lines
- TEAL· 12 lines
- GREENBUSH· 11 lines
- SPIER FALLS· 11 lines
- ALCOA MASSENA OPERATIONS - WEST PLANT· 10 lines
- MOHICAN· 9 lines
- All named substations in New York· 570 stations
- Datacenter candidate sites in New York· 2,980 sites
- Brownfield and retired plant sites in New York
- Substations by state
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, “NORTHPORT substation, New York”, https://gridcensus.com/substations/new-york/northport-a75fd70d (data as of June 29, 2026).
Dataset updated . Screening estimates derived from public data sources.
Substation attributes are derived from public HIFLD / EIA infrastructure data and may lag real-world upgrades or retirements. Voltage and connected-line counts are screening figures — confirm available capacity and interconnection terms directly with the operating utility and ISO.
Go deeper than the public screen
Every site and score for NORTHPORT substation, New York 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.