Brownfield & Retired Power Plant Sites in Connecticut
36 catalogued brownfield and retired-generation sites in Connecticut, listed by former capacity. Each carries an existing utility-scale grid interconnection that a new datacenter load may be able to re-use.
At a glance
What kinds of former sites are in Connecticut?
By former use, the list includes 19 landfill, 7 oil, 5 natural gas, 3 Superfund, 1 coal, 1 hydroelectric. Recorded retirement dates run from October 1998 to December 2023, with 7 retirements in 2015 or later. 20 of 22 sites with a measured distance sit within 2 miles of a transmission substation.
How does Connecticut compare with other states?
Connecticut ranks 20th of 50 states and DC by number of brownfield and retired-generation sites, out of 2,085 nationally. By recorded capacity (1,112 MW) it ranks 35th, against 289,280 MW across all states. The state also has 919 scored datacenter candidate sites, 13 of them classed as brownfield sites, averaging 56.7 on the 0–100 DC Readiness scale.
Where in Connecticut are these sites?
- New Haven County · 5
- Fairfield County · 3
- New London County · 3
- Litchfield County · 2
- Middlesex County · 1
All brownfield and retired plant sites in Connecticut
Frequently asked questions
How many retired power plants are in Connecticut?
GridCensus lists 14 retired power plant sites in Connecticut from EIA-860 retirement records. 12 have a recorded retirement date, 7 of them in 2015 or later.
What is the largest retired power plant or brownfield site in Connecticut?
Bridgeport Station in Bridgeport is the largest by recorded capacity, at 581.6 MW. It is followed by Devon Station (207 MW) and Waterside Power, LLC (69.6 MW).
Which power plant in Connecticut retired most recently?
IBM Southbury has the latest recorded retirement date in the state, December 2023, with 1.1 MW of capacity.
Which county in Connecticut has the most brownfield and retired plant sites?
New Haven County has the most, with 5, followed by Fairfield County with 3.
How many EPA brownfield sites in Connecticut have completed cleanup?
22 of the 22 EPA-tracked sites listed for Connecticut are recorded as cleanup complete.
Looking for a specific record? The directory lists every brownfield site, A to Z.
More on Connecticut, and states with similar counts
- Datacenter candidate sites in Connecticut· 919 sites
- Electric substations in Connecticut· 154 named
- Brownfield candidate sites nationwide
- Brownfield sites by state
- Brownfield sites in Louisiana· 37 sites
- Brownfield sites in South Carolina· 35 sites
- Brownfield sites in Georgia· 37 sites
- Brownfield sites in Virginia· 34 sites
About this data
Source: EIA-860 retired generating units and EPA RE-Powering America's Land contaminated-site records, as published March 6, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “Brownfield and retired power plant sites in Connecticut”, https://gridcensus.com/brownfield-sites/connecticut (data as of March 6, 2026).
Dataset updated . Screening estimates derived from public data sources.
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.