TUTHILL
SubstationNew York · LONG ISLAND POWER AUTHORITY
At a glance
TUTHILL is an electric transmission substation in New York, on LONG ISLAND POWER AUTHORITY's transmission network. It is classified as unclassified and connects 2 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 |
|---|---|---|---|---|
| #113297 | — | LONG ISLAND POWER AUTHORITY | IN SERVICE | 5.5 mi |
| #138074 | — | LONG ISLAND POWER AUTHORITY | IN SERVICE | 3.8 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TUTHILL, 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 |
|---|---|---|---|---|---|---|---|
| NEW HAVEN HARBOR | Substation-Adjacent | CT | South Central Connecticut Planning Region | 345 kV | 600 MW | 4.3 yrs | 68.8 |
| ELMWEST | Substation-Adjacent | CT | South Central Connecticut Planning Region | 115 kV | 100 MW | 4.3 yrs | 63.4 |
| ELM WEST | Substation-Adjacent | CT | South Central Connecticut Planning Region | 115 kV | 100 MW | 4.3 yrs | 63.4 |
| ALLINGS CROSSING | Substation-Adjacent | CT | South Central Connecticut Planning Region | 115 kV | 100 MW | 4.3 yrs | 63.2 |
| WATER ST | Substation-Adjacent | CT | South Central Connecticut Planning Region | 115 kV | 100 MW | 4.3 yrs | 62.6 |
| QUINNIPIAC | Substation-Adjacent | CT | South Central Connecticut Planning Region | 115 kV | 100 MW | 4.3 yrs | 62.4 |
| TAP135912 | Substation-Adjacent | CT | South Central Connecticut Planning Region | 115 kV | 100 MW | 4.3 yrs | 62.3 |
| JUNE ST | Substation-Adjacent | CT | South Central Connecticut Planning Region | 115 kV | 100 MW | 4.3 yrs | 62.1 |
Who owns the transmission lines at TUTHILL?
The 2 connected lines listed above are owned by LONG ISLAND POWER AUTHORITY. Their combined recorded length is about 9.4 miles.
How do candidate sites near TUTHILL score?
The 8 highest-scoring candidate sites within about 25 miles range from 62 to 69 on the 0–100 DC Readiness scale. They fall in 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
How many transmission lines connect to TUTHILL substation?
2 transmission lines terminate at or pass through TUTHILL in the HIFLD line data. Together the listed lines cover about 9.4 miles.
Who owns TUTHILL substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at TUTHILL belong to LONG ISLAND POWER AUTHORITY. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is TUTHILL substation located?
TUTHILL is in New York at 40.9593, -72.6115. The datacenter candidate sites closest to it are in South Central Connecticut Planning Region.
Are there datacenter candidate sites near TUTHILL substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TUTHILL. The highest-scoring is NEW HAVEN HARBOR at 69/100. Across New York, the average DC Readiness score is 54.
More in New York
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, “TUTHILL substation, New York”, https://gridcensus.com/substations/new-york/tuthill-29086807 (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 TUTHILL 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.