Greenfield (CARD` - MANSFIELD)
GreenfieldCapitol County, Connecticut · ISO-NE
At a glance
Greenfield (CARD` - MANSFIELD) is a greenfield datacenter candidate site in Capitol County, Connecticut, scoring 53.6/100 DC Readiness — 179th of 180 scored sites in the county. Its nearest substation is CARD`. It sits in the ISO-NE grid region and the CONNECTICUT LIGHT & POWER CO 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
Middle-of-the-pack interconnection conditions for this grid.
Connectivity
Site characteristics
Risk & environment
Location context
Regulatory climate
No notable statewide DC restriction on record; confirm local zoning and utility tariffs.
Incentive detail: Sales tax exemption on computer & data processing equipment.
Site location
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How does Greenfield (CARD` - MANSFIELD) compare with other sites in Capitol County?
Greenfield (CARD` - MANSFIELD) ranks 179th of 180 scored candidate sites in Capitol County. Its 53.6/100 is roughly in line with the county average of 57.6. It is roughly in line with the Connecticut average of 56.7 and roughly in line with the national average of 53.2.
Against the Connecticut average, its strongest sub-score is natural hazard (80 vs 77) and its weakest is fiber connectivity (83 vs 92). Power and speed to power each carry 20% of the composite score, fiber 12%, water 7% and hazard 6%.
How close is Greenfield (CARD` - MANSFIELD) to power, fiber and other datacenters?
The nearest mapped substation, CARD`, is the closest grid connection point on record and operates at 115 kV. For connectivity, the nearest internet exchange facility is Lumen Hartford at 20.2 miles. The closest operating datacenter on record is Ergonomic Group, 16.4 miles away.
What are the flood, water and hazard risks at Greenfield (CARD` - MANSFIELD)?
At the county level, FEMA's National Risk Index rates Capitol County "Relatively Low".
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 Capitol County, ranked by DC Readiness.
| Site | Type | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|
| TAP136499 | Substation-Adjacent | 345 kV | 600 MW | 4.3 yrs | 68.4 |
| MANCHESTER | Substation-Adjacent | 345 kV | 600 MW | 4.3 yrs | 68.3 |
| NORTH BLOOMFIELD | Substation-Adjacent | 345 kV | 600 MW | 4.3 yrs | 67.9 |
| BARBOUR HILL | Substation-Adjacent | 345 kV | 600 MW | 4.3 yrs | 67.9 |
| RIVERSIDE DR | Substation-Adjacent | 115 kV | 100 MW | 4.3 yrs | 63.4 |
| TAP136500 | Substation-Adjacent | 115 kV | 100 MW | 4.3 yrs | 63.4 |
| SOUTHWEST HARTFORD | Substation-Adjacent | 115 kV | 100 MW | 4.3 yrs | 63.3 |
| UNKNOWN136498 | Substation-Adjacent | 115 kV | 100 MW | 4.3 yrs | 63.3 |
Greenfield (CARD` - MANSFIELD): common questions
What is the DC Readiness score of Greenfield (CARD` - MANSFIELD)?
Greenfield (CARD` - MANSFIELD) scores 53.6/100 on the GridCensus DC Readiness scale, rated fair. It ranks 179th of 180 scored sites in Capitol County. The Capitol County average is 57.6 and the Connecticut average is 56.7.
What is the nearest substation to Greenfield (CARD` - MANSFIELD)?
The nearest mapped substation is CARD`, at 115 kV. GridCensus catalogs 100 MW of candidate capacity for the site.
Which electric utility serves Greenfield (CARD` - MANSFIELD)?
CONNECTICUT LIGHT & POWER CO (investor owned) holds the retail service territory that contains the site; its holding company is EVERSOURCE.
What grid region is Greenfield (CARD` - MANSFIELD) in?
Greenfield (CARD` - MANSFIELD) is in the ISO-NE region. Projects interconnecting there have averaged a 4.3-year wait from queue request to operation.
How far is Greenfield (CARD` - MANSFIELD) from an internet exchange?
The nearest internet exchange facility is Lumen Hartford, about 20.2 miles away.
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 (CARD` - MANSFIELD), Capitol County, CT”, https://gridcensus.com/datacenter-sites/connecticut/capitol-county/greenfield-card-mansfield-cbe3136d (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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