Substation-Adjacent Datacenter Sites in Connecticut
At a glance
Parcels sited next to existing transmission substations. Co-location with a substation is the single strongest speed-to-power signal — interconnection distance is measured in feet, not miles.
Top substation-adjacent sites in Connecticut
| 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 |
| TAP136499 | Substation-Adjacent | Capitol Planning Region | 345 kV | 600 MW | 4.3 yrs | 68.4 |
| MONTVILLE | Substation-Adjacent | Southeastern Connecticut 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 |
| NORTH BLOOMFIELD | Substation-Adjacent | Capitol Planning Region | 345 kV | 600 MW | 4.3 yrs | 67.9 |
| BARBOUR HILL | 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 |
How does Connecticut compare with other states for substation-adjacent sites?
With 171 sites, Connecticut ranks 42nd of the 52 states that have any substation-adjacent candidate sites. Texas leads with 3,635. Nationally, substation-adjacent sites average 57.4/100 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 substation-adjacent sites in Connecticut?
The top 25 range from 71.7 to 63.4 on the 0–100 DC Readiness Score. They are concentrated in Capitol Planning Region (5), Lower Connecticut River Valley Planning Region (5), Naugatuck Valley Planning Region (4) and Southeastern Connecticut Planning Region (3). By grid region, 25 are in ISO-NE.
County pages: Capitol Planning Region · Lower Connecticut River Valley Planning Region · Naugatuck Valley Planning Region · Southeastern Connecticut Planning Region
What power, fiber and flood exposure do these substation-adjacent sites have?
Of the top 25 substation-adjacent sites in Connecticut, 25 have a recorded nearest-substation voltage, with a median of 345 kV; for 19 that substation is rated 230 kV or higher. Their counties have a median of 10 fixed fiber broadband providers in FCC data. The median distance to the nearest internet exchange facility is 9 km. The median interconnection-queue wait in their markets is 4.3 years. 1 of the 6 with a mapped FEMA flood zone sits in a high-risk (A or V) zone.
Frequently asked questions
How many substation-adjacent datacenter sites are in Connecticut?
GridCensus catalogs 171 substation-adjacent datacenter candidate sites in Connecticut, 0.4% of the national total for this type (42nd of 52 states).
What is a substation-adjacent datacenter site?
Parcels sited next to existing transmission substations. Co-location with a substation is the single strongest speed-to-power signal — interconnection distance is measured in feet, not miles.
What is the best substation-adjacent datacenter site in Connecticut?
By DC Readiness Score, BRIDGEPORT RESCO in Greater Bridgeport Planning Region ranks first at 71.7/100, followed by NEW HAVEN HARBOR in South Central Connecticut Planning Region at 68.8.
Which Connecticut counties have the best substation-adjacent sites?
The top 25 substation-adjacent sites in Connecticut are concentrated in Capitol Planning Region (5), Lower Connecticut River Valley Planning Region (5), Naugatuck Valley Planning Region (4) and Southeastern Connecticut Planning Region (3).
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 substation-adjacent sites and Connecticut
- All datacenter sites in Connecticut· 919 sites
- Substation-Adjacent datacenter sites nationwide· 38,820 sites
- Industrial sites in Connecticut· 502 sites
- Greenfield sites in Connecticut· 115 sites
- Former Mine sites in Connecticut· 104 sites
- Federal Excess sites in Connecticut· 13 sites
- Brownfield sites in Connecticut· 13 sites
Substation-Adjacent sites in other states
- Substation-Adjacent sites in Texas· 3,635 sites
- Substation-Adjacent sites in California· 1,573 sites
- Substation-Adjacent sites in Florida· 1,539 sites
- Substation-Adjacent sites in Georgia· 1,530 sites
- Substation-Adjacent sites in Oklahoma· 1,344 sites
- Substation-Adjacent sites in Washington· 1,343 sites
- Substation-Adjacent sites in Minnesota· 1,270 sites
- Substation-Adjacent sites in Kentucky· 1,261 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, “Substation-Adjacent datacenter sites in Connecticut”, https://gridcensus.com/site-types/substation/connecticut (data as of November 12, 2026).
Go deeper than the public screen
Every site and score for Substation-Adjacent 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.