Greenfield Datacenter Sites in Connecticut
At a glance
Undeveloped land with no prior industrial use. Greenfield parcels offer maximum design flexibility and large contiguous footprints, but typically require full utility build-out — the speed-to-power story hinges on proximity to existing transmission.
Top greenfield sites in Connecticut
| Site | Type | County | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|---|
| Greenfield (MILLSTONE - CARD`) | Greenfield | Southeastern Connecticut Planning Region | 345 kV | 600 MW | 4.3 yrs | 60.1 |
| Greenfield (LAKE ROAD - CARD`) | Greenfield | Northeastern Connecticut Planning Region | 345 kV | 600 MW | 4.3 yrs | 59.7 |
| EC Near Norwalk Hospital Plant | Greenfield | Western Connecticut Planning Region | — | — | 4.3 yrs | 59.5 |
| EC Near Shepaug | Greenfield | Naugatuck Valley Planning Region | — | — | 4.3 yrs | 59.5 |
| Greenfield (COLUMBIA - CHRISTIANA) | Greenfield | Jefferson County | 345 kV | 600 MW | 4.3 yrs | 59.1 |
| EC Near Waterside Power, LLC | Greenfield | Western Connecticut Planning Region | — | — | 4.3 yrs | 58.5 |
| EC Near Subase Microgrid Project | Greenfield | Southeastern Connecticut Planning Region | — | — | 4.3 yrs | 58.5 |
| EC Near Subase Microgrid Project | Greenfield | Southeastern Connecticut Planning Region | — | — | 4.3 yrs | 58.4 |
| EC Near New Milford Gas Recovery | Greenfield | Naugatuck Valley Planning Region | — | — | 4.3 yrs | 58.0 |
| EC Near Waterside Power, LLC | Greenfield | Western Connecticut Planning Region | — | — | 4.3 yrs | 57.3 |
| EC Near Shepaug | Greenfield | Naugatuck Valley Planning Region | — | — | 4.3 yrs | 56.9 |
| EC Near IBM Southbury | Greenfield | Naugatuck Valley Planning Region | — | — | 4.3 yrs | 56.6 |
| Greenfield (NORWALK - BOONEVILLE) | Greenfield | Warren County | 161 kV | 100 MW | 4.3 yrs | 56.3 |
| EC Near Shepaug | Greenfield | Naugatuck Valley Planning Region | — | — | 4.3 yrs | 56.3 |
| EC Near Waterside Power, LLC | Greenfield | Western Connecticut Planning Region | — | — | 4.3 yrs | 56.2 |
| OZ New Haven | Greenfield | New Haven | — | — | 4.3 yrs | 55.8 |
| EC Near Norwalk Hospital Plant | Greenfield | Western Connecticut Planning Region | — | — | 4.3 yrs | 55.8 |
| EC Near North Main Street | Greenfield | Southeastern Connecticut Planning Region | — | — | 4.3 yrs | 55.7 |
| OZ Hartford | Greenfield | Hartford | — | — | 4.3 yrs | 55.6 |
| Greenfield (TAP136497 - MYSTIC) | Greenfield | Southeastern Connecticut Planning Region | 115 kV | 100 MW | 4.3 yrs | 55.5 |
| EC Near Waterside Power, LLC | Greenfield | Western Connecticut Planning Region | — | — | 4.3 yrs | 55.4 |
| EC Near Subase Microgrid Project | Greenfield | Southeastern Connecticut Planning Region | — | — | 4.3 yrs | 55.3 |
| EC Near Subase Microgrid Project | Greenfield | Southeastern Connecticut Planning Region | — | — | 4.3 yrs | 55.3 |
| Greenfield (MONTVILLE - TAP136485) | Greenfield | Southeastern Connecticut Planning Region | 115 kV | 100 MW | 4.3 yrs | 55.2 |
| Greenfield (SOUTHINGTON - JOHN STREET 1, 3) | Greenfield | Naugatuck Valley Planning Region | 115 kV | 100 MW | 4.3 yrs | 55.2 |
How does Connecticut compare with other states for greenfield sites?
With 115 sites, Connecticut ranks 40th of the 51 states that have any greenfield candidate sites. Texas leads with 1,276. Nationally, greenfield sites average 55.3/100 DC Readiness, above the 53.0 average across all site types. Across every site type, Connecticut averages 56.7, the 5th-highest of 52 states, and its candidate sites face an average interconnection-queue wait of 4.3 years.
Where are the highest-scoring greenfield sites in Connecticut?
The top 25 range from 60.1 to 55.2 on the 0–100 DC Readiness Score. They are concentrated in Southeastern Connecticut Planning Region (8), Western Connecticut Planning Region (6) and Naugatuck Valley Planning Region (6). By grid region, 22 are in ISO-NE, 2 are in MISO and 1 is in NYISO.
County pages: Southeastern Connecticut Planning Region · Western Connecticut Planning Region · Naugatuck Valley Planning Region · Northeastern Connecticut Planning Region
What power, fiber and flood exposure do these greenfield sites have?
Of the top 25 greenfield sites in Connecticut, 7 have a recorded nearest-substation voltage, with a median of 161 kV; for 3 that substation is rated 230 kV or higher. Their counties have a median of 6 fixed fiber broadband providers in FCC data. The median distance to the nearest internet exchange facility is 10 km. The median interconnection-queue wait in their markets is 4.3 years. 1 of the 18 with a mapped FEMA flood zone sits in a high-risk (A or V) zone.
Frequently asked questions
How many greenfield datacenter sites are in Connecticut?
GridCensus catalogs 115 greenfield datacenter candidate sites in Connecticut, 0.6% of the national total for this type (40th of 51 states).
What is a greenfield datacenter site?
Undeveloped land with no prior industrial use. Greenfield parcels offer maximum design flexibility and large contiguous footprints, but typically require full utility build-out — the speed-to-power story hinges on proximity to existing transmission.
What is the best greenfield datacenter site in Connecticut?
By DC Readiness Score, Greenfield (MILLSTONE - CARD`) in Southeastern Connecticut Planning Region ranks first at 60.1/100, followed by Greenfield (LAKE ROAD - CARD`) in Northeastern Connecticut Planning Region at 59.7.
Which Connecticut counties have the best greenfield sites?
The top 25 greenfield sites in Connecticut are concentrated in Southeastern Connecticut Planning Region (8), Western Connecticut Planning Region (6) and Naugatuck Valley Planning Region (6).
How does Connecticut score for datacenters overall?
All 919 scored sites in Connecticut average 56.7/100 DC Readiness, the 5th-highest of 52 states, against a national average of 53.0.
More on greenfield sites and Connecticut
- All datacenter sites in Connecticut· 919 sites
- Greenfield datacenter sites nationwide· 18,112 sites
- Industrial sites in Connecticut· 502 sites
- Substation-Adjacent sites in Connecticut· 171 sites
- Former Mine sites in Connecticut· 104 sites
- Federal Excess sites in Connecticut· 13 sites
- Brownfield sites in Connecticut· 13 sites
Greenfield sites in other states
- Greenfield sites in Texas· 1,276 sites
- Greenfield sites in Pennsylvania· 973 sites
- Greenfield sites in California· 941 sites
- Greenfield sites in Illinois· 913 sites
- Greenfield sites in Florida· 791 sites
- Greenfield sites in Michigan· 719 sites
- Greenfield sites in Ohio· 680 sites
- Greenfield sites in Kentucky· 640 sites
Dataset updated . Screening estimates derived from public data sources.
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 November 12, 2026 — GridCensus refreshes it monthly. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “Greenfield datacenter sites in Connecticut”, https://gridcensus.com/site-types/greenfield/connecticut (data as of November 12, 2026).
Go deeper than the public screen
Every site and score for Greenfield sites in Connecticut 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.