Former Mine Datacenter Sites in Connecticut
At a glance
Decommissioned or active mining land. Mine sites often retain heavy electrical service and water rights from prior operations, and many sit near coal-plant substations now freeing up grid capacity.
Top former mine sites in Connecticut
| Site | Type | County | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|---|
| Mine Site | Former Mine | Naugatuck Valley County | — | — | 4.3 yrs | 57.6 |
| Mine Site | Former Mine | Capitol County | — | — | 4.3 yrs | 57.5 |
| Mine Site | Former Mine | Naugatuck Valley County | — | — | 4.3 yrs | 57.4 |
| Mine Site | Former Mine | Naugatuck Valley County | — | — | 4.3 yrs | 57.4 |
| Mine Site | Former Mine | Naugatuck Valley County | — | — | 4.3 yrs | 57.3 |
| Mine Site | Former Mine | Western Connecticut County | — | — | 4.3 yrs | 57.3 |
| Mine Site | Former Mine | Naugatuck Valley County | — | — | 4.3 yrs | 57.2 |
| Mine Site | Former Mine | Capitol County | — | — | 4.3 yrs | 56.6 |
| Mine Site | Former Mine | Southeastern Connecticut County | — | — | 4.3 yrs | 56.5 |
| Mine Site | Former Mine | Western Connecticut County | — | — | 4.3 yrs | 56.4 |
| Mine Site | Former Mine | Naugatuck Valley County | — | — | 4.3 yrs | 56.3 |
| Mine Site | Former Mine | Greater Bridgeport County | — | — | 4.3 yrs | 56.3 |
| Mine Site | Former Mine | Southeastern Connecticut County | — | — | 4.3 yrs | 56.3 |
| Mine Site | Former Mine | Naugatuck Valley County | — | — | 4.3 yrs | 56.3 |
| Mine Site | Former Mine | Naugatuck Valley County | — | — | 4.3 yrs | 56.3 |
| Mine Site | Former Mine | Naugatuck Valley County | — | — | 4.3 yrs | 56.3 |
| Mine Site | Former Mine | Naugatuck Valley County | — | — | 4.3 yrs | 56.3 |
| Mine Site | Former Mine | South Central Connecticut County | — | — | 4.3 yrs | 56.3 |
| Mine Site | Former Mine | Naugatuck Valley County | — | — | 4.3 yrs | 56.3 |
| Mine Site | Former Mine | Naugatuck Valley County | — | — | 4.3 yrs | 56.3 |
| Mine Site | Former Mine | Naugatuck Valley County | — | — | 4.3 yrs | 56.3 |
| Mine Site | Former Mine | Naugatuck Valley County | — | — | 4.3 yrs | 56.2 |
| Mine Site | Former Mine | South Central Connecticut County | — | — | 4.3 yrs | 56.2 |
| Mine Site | Former Mine | Capitol County | — | — | 4.3 yrs | 56.1 |
| Mine Site | Former Mine | Western Connecticut County | — | — | 4.3 yrs | 56.1 |
How does Connecticut compare with other states for former mine sites?
With 104 sites, Connecticut ranks 44th of the 50 states that have any former mine candidate sites. Kentucky leads with 5,049. Nationally, former mine sites average 49.7/100 DC Readiness, below 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 former mine sites in Connecticut?
The top 25 range from 57.6 to 56.1 on the 0–100 DC Readiness Score. They are concentrated in Naugatuck Valley County (14), Capitol County (3), Western Connecticut County (3) and Southeastern Connecticut County (2). By grid region, 25 are in ISO-NE.
County pages: Naugatuck Valley County · Capitol County · Western Connecticut County · Southeastern Connecticut County
What power, fiber and flood exposure do these former mine sites have?
The median distance to the nearest internet exchange facility is 7 km. The median interconnection-queue wait in their markets is 4.3 years. None of the 2 with a mapped FEMA flood zone sits in a high-risk (A or V) zone.
Frequently asked questions
How many former mine datacenter sites are in Connecticut?
GridCensus catalogs 104 former mine datacenter candidate sites in Connecticut, 0.4% of the national total for this type (44th of 50 states).
What is a former mine datacenter site?
Decommissioned or active mining land. Mine sites often retain heavy electrical service and water rights from prior operations, and many sit near coal-plant substations now freeing up grid capacity.
What is the best former mine datacenter site in Connecticut?
By DC Readiness Score, Mine Site in Naugatuck Valley County ranks first at 57.6/100, followed by Mine Site in Capitol County at 57.5.
Which Connecticut counties have the best former mine sites?
The top 25 former mine sites in Connecticut are concentrated in Naugatuck Valley County (14), Capitol County (3), Western Connecticut County (3) and Southeastern Connecticut County (2).
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 former mine sites and Connecticut
- All datacenter sites in Connecticut· 919 sites
- Former Mine datacenter sites nationwide· 26,205 sites
- Industrial sites in Connecticut· 502 sites
- Substation-Adjacent sites in Connecticut· 171 sites
- Greenfield sites in Connecticut· 115 sites
- Federal Excess sites in Connecticut· 13 sites
- Brownfield sites in Connecticut· 13 sites
Former Mine sites in other states
- Former Mine sites in Kentucky· 5,049 sites
- Former Mine sites in Pennsylvania· 3,356 sites
- Former Mine sites in West Virginia· 2,495 sites
- Former Mine sites in Virginia· 1,614 sites
- Former Mine sites in Alabama· 1,069 sites
- Former Mine sites in Texas· 935 sites
- Former Mine sites in Ohio· 925 sites
- Former Mine sites in Tennessee· 661 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, “Former Mine datacenter sites in Connecticut”, https://gridcensus.com/site-types/mine/connecticut (data as of November 12, 2026).
Go deeper than the public screen
Every site and score for Former Mine 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.