Datacenter Sites in Connecticut
Connecticut has 919 scored datacenter candidate sites averaging 56.7/100 DC Readiness. Industrial parcels lead the inventory (502 sites). Most sites interconnect through ISO-NE. The state's candidate sites carry a catalogued aggregate of 27.9k MW and average a 4.3 yrs interconnection-queue wait.
At a glance
Connecticut has 919 scored datacenter candidate sites, the 44th-most of the 50 states, DC and Puerto Rico, averaging 56.7/100 DC Readiness against a national average of 53.0. Its average score ranks 5th among states. The state also has 14 operating datacenters and 16 internet exchange facilities on record.
How does Connecticut compare with other states for datacenter sites?
By number of scored candidate sites, Connecticut ranks 44th of the 50 states, DC and Puerto Rico (919 of 147,272 nationally, 0.6%). Its average DC Readiness of 56.7/100 ranks 5th and is roughly in line with the national average of 53.0. The average interconnection-queue wait at its sites, 4.3-year, is the 23rd-shortest of the group (national 4.2-year).
Across the five headline sub-scores, Connecticut is strongest relative to the nation on fiber (91.8 vs 69.1 nationally) and weakest on power availability (35.5 vs 37.4). Power and speed to power carry 20% of the score each, fiber 12%, water 7% and hazard 6%.
Which counties in Connecticut have the most datacenter sites?
Capitol County (180 sites, average 57.6), Naugatuck Valley Planning Region (159 sites, average 57.5), and Southeastern Connecticut County (103 sites, average 56.8) hold the largest inventories. Together the top 3 account for 48% of the state's scored sites. Greater Bridgeport County has the highest average score among counties with at least 10 sites (58.2/100). 10 counties have five or more scored sites and their own county page.
What kinds of sites and grid regions are in Connecticut?
Industrial parcels are the largest category (502, 55%), followed by substation-adjacent (171) and greenfield (115). Sites span 2 grid regions; ISO-NE covers 100% of them.
By site type
Average sub-score profile
How Connecticut's candidate sites score on each DC Readiness dimension (0–100 average).
Top 25 datacenter sites in Connecticut
Ranked by DC Readiness.
| Site | Type | County | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|---|
| BRIDGEPORT RESCO | Substation-Adjacent | Greater Bridgeport Planning Region | 345 kV | 600 MW | 4.3 yrs | 71.7 |
| NEW HAVEN HARBOR | Substation-Adjacent | South Central Connecticut Planning Region | 345 kV | 600 MW | 4.3 yrs | 68.8 |
| UNKNOWN135915 | Substation-Adjacent | Southeastern Connecticut Planning Region | 345 kV | 600 MW | 4.3 yrs | 68.6 |
| FROST BRIDGE | Substation-Adjacent | Naugatuck Valley Planning Region | 345 kV | 600 MW | 4.3 yrs | 68.5 |
| MONTVILLE | Substation-Adjacent | Southeastern Connecticut Planning Region | 345 kV | 600 MW | 4.3 yrs | 68.4 |
| TAP136499 | Substation-Adjacent | Capitol Planning Region | 345 kV | 600 MW | 4.3 yrs | 68.4 |
| MANCHESTER | Substation-Adjacent | Capitol Planning Region | 345 kV | 600 MW | 4.3 yrs | 68.3 |
| NO. WALL | Substation-Adjacent | Lower Connecticut River Valley Planning Region | 345 kV | 600 MW | 4.3 yrs | 68.2 |
| PLUMTREE | Substation-Adjacent | Western Connecticut Planning Region | 345 kV | 600 MW | 4.3 yrs | 68.2 |
| BARBOUR HILL | Substation-Adjacent | Capitol Planning Region | 345 kV | 600 MW | 4.3 yrs | 67.9 |
| NORTH BLOOMFIELD | Substation-Adjacent | Capitol Planning Region | 345 kV | 600 MW | 4.3 yrs | 67.9 |
| SOUTHINGTON | Substation-Adjacent | Naugatuck Valley Planning Region | 345 kV | 600 MW | 4.3 yrs | 67.8 |
| KLEEN | Substation-Adjacent | Lower Connecticut River Valley Planning Region | 345 kV | 600 MW | 4.3 yrs | 67.6 |
| SCOVILL ROCK | Substation-Adjacent | Lower Connecticut River Valley Planning Region | 345 kV | 600 MW | 4.3 yrs | 67.2 |
| LONG MOUNTAIN | Substation-Adjacent | Dutchess County | 345 kV | 600 MW | 4.3 yrs | 66.8 |
| HADDAM NECK | Substation-Adjacent | Lower Connecticut River Valley Planning Region | 345 kV | 600 MW | 4.3 yrs | 66.1 |
| CARD` | Substation-Adjacent | Southeastern Connecticut Planning Region | 345 kV | 600 MW | 4.3 yrs | 66.0 |
| HADDAM | Substation-Adjacent | Lower Connecticut River Valley Planning Region | 345 kV | 600 MW | 4.3 yrs | 65.9 |
| KILLINGLY | Substation-Adjacent | Northeastern Connecticut Planning Region | 345 kV | 600 MW | 4.3 yrs | 65.8 |
| DEVON | Substation-Adjacent | Greater Bridgeport Planning Region | 115 kV | 100 MW | 4.3 yrs | 65.0 |
| WATERSIDE | Substation-Adjacent | Westchester County | 115 kV | 100 MW | 4.3 yrs | 63.9 |
| SHEPAUG | Substation-Adjacent | Naugatuck Valley Planning Region | 115 kV | 100 MW | 4.3 yrs | 63.9 |
| FREIGHT | Substation-Adjacent | Naugatuck Valley Planning Region | 115 kV | 100 MW | 4.3 yrs | 63.5 |
| RIVERSIDE DR | Substation-Adjacent | Capitol Planning Region | 115 kV | 100 MW | 4.3 yrs | 63.4 |
| ELMWEST | Substation-Adjacent | South Central Connecticut Planning Region | 115 kV | 100 MW | 4.3 yrs | 63.4 |
Counties in Connecticut
10 counties with five or more scored sites.
Sites in Connecticut counties with fewer than five sites
44 scored sites sit in counties too small for a county page of their own.
- OZ New Haven · New Haven · 55.8
- OZ New Haven · New Haven · 55.0
- OZ New Haven · New Haven · 54.3
- EC Coal Fairfield County · Fairfield County · 52.9
- OZ New Haven · New Haven · 52.5
- OZ New London · New London · 51.7
- OZ Windham · Windham · 48.8
- EC FFE Fairfield County · Fairfield County · 48.7
- OZ Middlesex · Middlesex · 48.6
- OZ New Haven · New Haven · 47.1
- OZ Tolland · Tolland · 44.7
Operating datacenters in Connecticut
14 operating datacenter facilities in Connecticut are on record, the 34th-most of any state. Stamford has the largest cluster (4 facilities). The operators with the most facilities here are Lumen Technologies Inc (4), Cloudpath LLC (3), Digital Realty (1). Footprints are recorded for 4 of them, totalling about 0.3 million square feet.
Stamford (4)
- amnet Data Center · Cloudpath LLC
- Cloudpath CT19 (5 Landmark Sq) · Cloudpath LLC
- Cloudpath CT2 (1351 Washington Blvd) · Cloudpath LLC
- Lumen Stamford · Lumen Technologies Inc
Hartford (2)
- Crown Castle Hartford (960 Main) · Crown Castle Inc.
- Lumen Hartford · Lumen Technologies Inc
Glastonbury (1)
New London (1)
- Lumen New London · Lumen Technologies Inc
Norwalk (1)
- CyrusOne Norwalk · CyrusOne
Southbury (1)
- SD / Comsat Southbury Ground Station · SD Data Center
Trumbull (1)
- Digital Realty New York HVN10 · Digital Realty
Wallingford (1)
Waterbury (1)
- HDC1 - 108 Bank St · Colocation America Corporation
West Haven (1)
- Lumen West Haven · Lumen Technologies Inc
Internet exchange and peering facilities in Connecticut
16 peering and colocation facilities in Connecticut are listed in PeeringDB. Stamford has the most (6). The best-connected facility hosts 3 networks; the median facility in the state hosts 1 networks.
Stamford (6)
- Cloudpath CT19 (5 Landmark Sq) · 2 networks
- Cloudpath CT1 (26 Fahey St) · 1 networks
- Cloudpath CT2 (1351 Washington Blvd) · 1 networks
- Crown Castle Stamford · 1 networks
- Lumen Stamford · 1 networks
- Omega CT1 · 0 networks
Hartford (2)
- Lumen Hartford · 1 networks
- Crown Castle Hartford (960 Main) · 0 networks
Waterbury (2)
- TierPoint Waterbury · 1 networks
- HDC1 - 108 Bank St · 0 networks
New Haven (1)
- Lumen New Haven · 1 networks
New London (1)
- Lumen New London · 1 networks
Norwalk (1)
- CyrusOne Norwalk · 3 networks
Southbury (1)
- SD / Comsat Southbury Ground Station · 1 networks
Trumbull (1)
- Aphorio Carter Trumbull Data Center · 1 networks
West Haven (1)
- Lumen West Haven · 1 networks
Connecticut datacenter site selection FAQ
How many datacenter sites are in Connecticut?
GridCensus catalogs 919 scored datacenter candidate sites in Connecticut, with an average DC Readiness score of 56.7/100. That is the 44th-largest inventory of the 50 states, DC and Puerto Rico.
How many operating datacenters are in Connecticut?
14 operating datacenter facilities in Connecticut are on record, the 34th-most of any state. Stamford has the most (4). Lumen Technologies Inc operates the most facilities in the state (4).
What is the average interconnection-queue wait in Connecticut?
Candidate sites in Connecticut average a 4.3-year interconnection-queue wait, with an average queue depth of 8 projects. The national average across all scored sites is 4.2-year, and Connecticut has the 23rd-shortest average wait of the 50 states, DC and Puerto Rico.
Which county in Connecticut has the most datacenter sites?
Capitol County has the most scored candidate sites in Connecticut (180), followed by Naugatuck Valley Planning Region (159) and Southeastern Connecticut County (103). Among counties with at least 10 sites, Greater Bridgeport County has the highest average DC Readiness (58.2/100).
What kind of datacenter sites are most common in Connecticut?
Industrial sites are the most common category in Connecticut (502 sites, 55% of the inventory), and most sites fall within the ISO-NE grid region.
How many internet exchange facilities are in Connecticut?
16 peering and colocation facilities listed in PeeringDB are in Connecticut. Stamford has the most (6). The best-connected one hosts 3 networks.
Looking for a specific record? The directory lists every scored datacenter site in Connecticut, A to Z.
More Connecticut infrastructure
- Electric substations in Connecticut
- Brownfield and retired power plant sites in Connecticut
- ISO-NE grid region· 917 sites here
- NYISO grid region· 2 sites here
- Industrial sites in Connecticut· 502
- Substation-Adjacent sites in Connecticut· 171
- Greenfield sites in Connecticut· 115
- Former Mine sites in Connecticut· 104
- States ranked by datacenter readiness
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, “Datacenter candidate sites in Connecticut”, https://gridcensus.com/datacenter-sites/connecticut (data as of November 12, 2026).
Dataset updated . Screening estimates derived from public data sources.
Go deeper than the public screen
Every site and score for 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.