Brownfield Datacenter Sites in Connecticut
At a glance
Previously developed land with real or perceived environmental contamination. Brownfields trade remediation overhead for existing utility hookups, infill locations near fiber, and redevelopment incentives.
Top brownfield sites in Connecticut
| Site | Type | County | Former use | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|---|---|
| Newtown Landfill Solar | Brownfield | Naugatuck Valley Planning Region | landfill | 115 kV | 1 MW | 4.3 yrs | 59.5 |
| Rogers Road Landfill | Brownfield | Southeastern Connecticut Planning Region | landfill | 115 kV | 3 MW | 4.3 yrs | 58.5 |
| Norwalk Hospital Plant | Brownfield | Western Connecticut Planning Region | gas | — | 3 MW | 4.3 yrs | 57.5 |
| IBM Southbury | Brownfield | Naugatuck Valley Planning Region | gas | — | 1 MW | 4.3 yrs | 56.0 |
| Hartford CT Landfill (solar) | Brownfield | — | landfill | 115 kV | 1 MW | 4.3 yrs | 55.7 |
| Middletown Landfill - Wilton | Brownfield | — | landfill | 115 kV | — | 4.3 yrs | 55.3 |
| Derby Landfill Solar | Brownfield | — | landfill | 115 kV | 1 MW | 4.3 yrs | 54.2 |
| Subase Microgrid Project | Brownfield | Southeastern Connecticut Planning Region | gas | — | 13 MW | 4.3 yrs | 53.9 |
| Pfizer Groton Plant | Brownfield | Southeastern Connecticut Planning Region | gas | — | 5 MW | 4.3 yrs | 53.6 |
| New Milford Gas Recovery | Brownfield | Naugatuck Valley Planning Region | gas | — | 3 MW | 4.3 yrs | 53.1 |
| North Main Street | Brownfield | Southeastern Connecticut Planning Region | oil | — | 19 MW | 4.3 yrs | 51.6 |
| Evansville Avenue Landfill | Brownfield | — | landfill | 115 kV | 1 MW | 4.3 yrs | 49.8 |
| Colebrook Hydroelectric | Brownfield | Northwest Hills Planning Region | hydro | — | 3 MW | 4.3 yrs | 48.4 |
How does Connecticut compare with other states for brownfield sites?
With 13 sites, Connecticut ranks 18th of the 49 states that have any brownfield candidate sites. California leads with 103. Nationally, brownfield sites average 57.5/100 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 brownfield sites in Connecticut?
The top 13 range from 59.5 to 48.4 on the 0–100 DC Readiness Score. They are concentrated in Southeastern Connecticut Planning Region (4) and Naugatuck Valley Planning Region (3). By grid region, 13 are in ISO-NE.
County pages: Southeastern Connecticut Planning Region · Naugatuck Valley Planning Region · Western Connecticut Planning Region · Northwest Hills Planning Region
What power, fiber and flood exposure do these brownfield sites have?
Of the top 13 brownfield sites in Connecticut, 6 have a recorded nearest-substation voltage, with a median of 115 kV; for 0 that substation is rated 230 kV or higher. Their counties have a median of 2 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 13 with a mapped FEMA flood zone sits in a high-risk (A or V) zone.
Frequently asked questions
How many brownfield datacenter sites are in Connecticut?
GridCensus catalogs 13 brownfield datacenter candidate sites in Connecticut, 2% of the national total for this type (18th of 49 states).
What is a brownfield datacenter site?
Previously developed land with real or perceived environmental contamination. Brownfields trade remediation overhead for existing utility hookups, infill locations near fiber, and redevelopment incentives.
What is the best brownfield datacenter site in Connecticut?
By DC Readiness Score, Newtown Landfill Solar in Naugatuck Valley Planning Region ranks first at 59.5/100, followed by Rogers Road Landfill in Southeastern Connecticut Planning Region at 58.5.
Which Connecticut counties have the best brownfield sites?
The top 13 brownfield sites in Connecticut are concentrated in Southeastern Connecticut Planning Region (4) and Naugatuck Valley 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 brownfield sites and Connecticut
- All datacenter sites in Connecticut· 919 sites
- Brownfield datacenter sites nationwide· 771 sites
- Industrial sites in Connecticut· 502 sites
- Substation-Adjacent sites in Connecticut· 171 sites
- Greenfield sites in Connecticut· 115 sites
- Former Mine sites in Connecticut· 104 sites
- Federal Excess sites in Connecticut· 13 sites
Brownfield sites in other states
- Brownfield sites in California· 103 sites
- Brownfield sites in New Jersey· 52 sites
- Brownfield sites in New York· 48 sites
- Brownfield sites in Massachusetts· 44 sites
- Brownfield sites in Iowa· 38 sites
- Brownfield sites in Illinois· 33 sites
- Brownfield sites in Texas· 30 sites
- Brownfield sites in Ohio· 29 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, “Brownfield datacenter sites in Connecticut”, https://gridcensus.com/site-types/brownfield/connecticut (data as of November 12, 2026).
Go deeper than the public screen
Every site and score for Brownfield 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.