Greenfield (LIGHTHOUSE HILL - TAP139304)
GreenfieldJefferson County, New York · NYISO
At a glance
Greenfield (LIGHTHOUSE HILL - TAP139304) is a greenfield datacenter candidate site in Jefferson County, New York, scoring 49.0/100 DC Readiness — 30th of 37 scored sites in the county. Its nearest substation is LIGHTHOUSE HILL. It sits in the NYISO grid region and the NIAGARA MOHAWK POWER CORP. service territory, where interconnection has averaged 4.3 years from request to operation. GridCensus catalogs 100 MW of candidate capacity here.
Power & interconnection
Speed to power
Deep queue and long historical waits — plan for a multi-year interconnection timeline and engage the utility early.
Connectivity
Site characteristics
Risk & environment
Location context
Regulatory climate
First statewide moratorium (2026): 1-yr hold on certain permits for large DCs + impact study.
Moratorium/permit hold targets large datacenters.
Incentive detail: Excelsior Jobs Program tax credits; IDA property tax abatements (PILOT); Empire State Digital Gaming.
Site location
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How does Greenfield (LIGHTHOUSE HILL - TAP139304) compare with other sites in Jefferson County?
Greenfield (LIGHTHOUSE HILL - TAP139304) ranks 30th of 37 scored candidate sites in Jefferson County. Its 49.0/100 is roughly in line with the county average of 53.6. It is roughly in line with the New York average of 54.0 and roughly in line with the national average of 53.2.
Against the New York average, its strongest sub-score is natural hazard (65 vs 64) and its weakest is fiber connectivity (62 vs 76). Power and speed to power each carry 20% of the composite score, fiber 12%, water 7% and hazard 6%.
How close is Greenfield (LIGHTHOUSE HILL - TAP139304) to power, fiber and other datacenters?
The nearest mapped substation, LIGHTHOUSE HILL, is the closest grid connection point on record and operates at 115 kV. The nearest located transmission bottleneck is SCRIBA 345 VOLNEY 345 1 (NYISO), 31 miles away. For connectivity, the nearest internet exchange facility is Westelcom Networks Watertown at 17 miles. 9 fiber providers report service at the location in FCC broadband data. The closest operating datacenter on record is Westelcom Networks Watertown, 17 miles away.
What are the flood, water and hazard risks at Greenfield (LIGHTHOUSE HILL - TAP139304)?
At the county level, FEMA's National Risk Index rates Jefferson County "Relatively High".
Full DC Readiness breakdown
All 13 weighted sub-scores (0–100) behind the composite DC Readiness score.
Nearby comparable sites
Other scored datacenter candidate sites in Jefferson County, ranked by DC Readiness.
| Site | Type | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|
| OZ Jefferson | Greenfield | — | — | 4.3 yrs | 59.4 |
| UNKNOWN124470 | Substation-Adjacent | 115 kV | 100 MW | 4.3 yrs | 59.0 |
| TAP139311 | Substation-Adjacent | 115 kV | 100 MW | 4.3 yrs | 59.0 |
| UNKNOWN125576 | Substation-Adjacent | 115 kV | 100 MW | 4.3 yrs | 59.0 |
| UNKNOWN130013 | Substation-Adjacent | 115 kV | 100 MW | 4.3 yrs | 58.8 |
| UNKNOWN125578 | Substation-Adjacent | 115 kV | 100 MW | 4.3 yrs | 57.8 |
| UNKNOWN125575 | Substation-Adjacent | 115 kV | 100 MW | 4.3 yrs | 57.7 |
| TAP139312 | Substation-Adjacent | 115 kV | 100 MW | 4.3 yrs | 57.6 |
Greenfield (LIGHTHOUSE HILL - TAP139304): common questions
What is the DC Readiness score of Greenfield (LIGHTHOUSE HILL - TAP139304)?
Greenfield (LIGHTHOUSE HILL - TAP139304) scores 49.0/100 on the GridCensus DC Readiness scale, rated fair. It ranks 30th of 37 scored sites in Jefferson County. The Jefferson County average is 53.6 and the New York average is 54.0.
What is the nearest substation to Greenfield (LIGHTHOUSE HILL - TAP139304)?
The nearest mapped substation is LIGHTHOUSE HILL, at 115 kV. GridCensus catalogs 100 MW of candidate capacity for the site.
Which electric utility serves Greenfield (LIGHTHOUSE HILL - TAP139304)?
NIAGARA MOHAWK POWER CORP. (investor owned) holds the retail service territory that contains the site; its holding company is NATIONAL GRID GROUP PLC.
What grid region is Greenfield (LIGHTHOUSE HILL - TAP139304) in?
Greenfield (LIGHTHOUSE HILL - TAP139304) is in the NYISO region. Projects interconnecting there have averaged a 4.3-year wait from queue request to operation.
How far is Greenfield (LIGHTHOUSE HILL - TAP139304) from an internet exchange?
The nearest internet exchange facility is Westelcom Networks Watertown, about 17 miles away; 9 fiber providers report service at the location.
Related pages
About this data
Source: GridCensus composite of HIFLD transmission and substation data, EIA, FEMA National Risk Index, FCC broadband data, PeeringDB and ISO interconnection queues, as published October 10, 2026 — GridCensus refreshes it monthly. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “Greenfield (LIGHTHOUSE HILL - TAP139304), Jefferson County, NY”, https://gridcensus.com/datacenter-sites/new-york/jefferson-county/greenfield-lighthouse-hill-tap139304-8d422fa4 (data as of October 10, 2026).
Dataset updated . Screening estimates derived from public data sources.
Figures are screening estimates derived from public infrastructure data. Catalogued capacity reflects theoretical candidate capacity, not deliverable or committed interconnection. Confirm all values with the utility, ISO, and on-the-ground due diligence.
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