[ { "slug": "androscoggin-mill-jay", "name": "Androscoggin Mill Data Center", "operator": "JGT2 Redevelopment", "town": "Jay", "state": "ME", "lat": 44.5049582, "lon": -70.2385486, "lifecycle_stage": "status_uncertain", "capacity_mw": null, "capacity_source_url": null, "cooling_type": null, "cooling_source_url": null, "sq_ft": null, "year_built": null, "summary": "Former paper mill site proposed for redevelopment into a data center by Sentinel Data Centers LLC, a $550M plan that prompted Maine Gov. Mills to veto a statewide data-center moratorium (LD 307) specifically to protect it -- the veto held after the House failed to override it 72-65. In June 2026, Sentinel notified site owner JGT2 Redevelopment that it did not intend to move forward; the site is reportedly being shopped to other operators, so its future is unresolved." }, { "slug": "aphorio-carter-trumbull", "name": "Aphorio Carter – Trumbull", "operator": "Aphorio Carter", "town": "Trumbull", "state": "CT", "lat": 41.246777, "lon": -73.202026, "lifecycle_stage": "operating", "capacity_mw": 15, "capacity_source_url": "https://www.datacentermap.com/usa/connecticut/trumbull/80-merritt-boulevard/", "cooling_type": null, "cooling_source_url": null, "sq_ft": 227552, "year_built": 1960, "summary": "Long-operating data center built in 1960, acquired by Aphorio Carter from Digital Realty in 2024. Decades of pre-existing hydrologic baseline available for comparison." }, { "slug": "atlas-capital-bloomfield", "name": "Atlas Capital Group – Bloomfield", "operator": "Atlas Capital Group", "town": "Bloomfield", "state": "CT", "lat": 41.8843905, "lon": -72.7389957, "lifecycle_stage": "proposed", "capacity_mw": null, "capacity_source_url": null, "cooling_type": "closed_loop_chilled_water", "cooling_source_url": "https://sentrycommercial.com/market/conceptual-plans-emerge-for-1m-sqft-data-center-in-hartford-county/", "sq_ft": 1000000, "year_built": null, "summary": "New York-based developer Atlas Capital Group gave an informal presentation to Bloomfield's Town Plan and Zoning Commission on June 26, 2025, for a two-story, 1M+ sq ft data center on a 44.5-acre former tobacco field. Conceptual plans describe roughly 900,000 sq ft of data-processing space, a 127,000 sq ft open-air substation, rooftop chillers, and generator yards. No formal application, site plan, or permits have been filed yet — this is pre-application, land-acquisition-stage only." }, { "slug": "charter-development-wallingford", "name": "Charter Development – Wallingford", "operator": "Charter Development LLC", "town": "Wallingford", "state": "CT", "lat": 41.4775564, "lon": -72.7667949, "lifecycle_stage": "proposed", "capacity_mw": null, "capacity_source_url": null, "cooling_type": null, "cooling_source_url": null, "sq_ft": null, "year_built": null, "summary": "Proposed data center on the former Watershed Interchange District land off I-91 Exit 15, on a parcel that also protects the Muddy River watershed. The Wallingford Planning & Zoning Commission approved a zoning text amendment allowing data centers in the district in December 2024, following a public hearing that ran over three months. No building plans, capacity, or cooling details have been disclosed yet." }, { "slug": "cyrusone-norwalk", "name": "CyrusOne – Norwalk", "operator": "CyrusOne", "town": "Norwalk", "state": "CT", "lat": 41.1109886, "lon": -73.3982704, "lifecycle_stage": "operating", "capacity_mw": 16, "capacity_source_url": "https://www.cyrusone.com/data-centers/north-america/norwalk-ct", "cooling_type": null, "cooling_source_url": null, "sq_ft": 168000, "year_built": 2013, "summary": "Connecticut's largest data center, opened in 2013 on the site of a former industrial park. Operated continuously as a Tier III colocation facility since opening; predates the state's recent wave of AI-driven proposals by over a decade." }, { "slug": "equinix-billerica", "name": "Equinix BO2 – Billerica", "operator": "Equinix", "town": "Billerica", "state": "MA", "lat": 42.5506457, "lon": -71.2152796, "lifecycle_stage": "operating", "capacity_mw": 16.8, "capacity_source_url": "https://www.datacentermap.com/usa/massachusetts/boston/equinix-bo2/specs/", "cooling_type": "closed_loop_chilled_water", "cooling_source_url": "https://www.datacentermap.com/usa/massachusetts/boston/equinix-bo2/specs/", "sq_ft": 108336, "year_built": 1998, "summary": "Colocation facility operating continuously since 1998, originally built and operated by Verizon as \"BOS1.\" Equinix acquired it in 2017 as part of a 29-data-center portfolio purchase from Verizon. One of the longer-operating facilities tracked on this site, with two decades of history before its current ownership." }, { "slug": "gray-wolf-bristol", "name": "Gray Wolf Data Centers – Bristol", "operator": "Gray Wolf Data Centers", "town": "Bristol", "state": "CT", "lat": 41.685173, "lon": -72.962708, "lifecycle_stage": "permitting", "capacity_mw": 3, "capacity_source_url": "https://graywolfdatacenters.com/locations/bristol/", "cooling_type": "closed_loop_chilled_water", "cooling_source_url": "https://www.bristolct.gov/m/newsflash/home/detail/1683", "sq_ft": null, "year_built": null, "summary": "Former Dodge Village site on the Pequabuck River. CT Siting Council approved fuel-cell power (Petition 1540) in Dec 2022; a construction-time extension was approved Sept 2025; the Inland Wetlands Watercourses Agency approved the wetlands permit in April 2026 with stormwater conditions. Active local opposition over water usage — the operator has published its own water-use comparison." }, { "slug": "markley-group-lowell", "name": "Markley Group – Lowell", "operator": "Markley Group", "town": "Lowell", "state": "MA", "lat": 42.630691, "lon": -71.306515, "lifecycle_stage": "operating", "capacity_mw": null, "capacity_source_url": null, "cooling_type": "cooling_tower_evaporative", "cooling_source_url": "https://law.yale.edu/yls-today/news/clinic-advocates-against-data-center-expansion-massachusetts-city", "sq_ft": 352000, "year_built": 2015, "summary": "Massachusetts' largest data center (352,000 sq ft), operating in Lowell's Sacred Heart neighborhood since 2015. A 2025 MassDEP air-quality permit for 27 backup diesel generators and 16 cooling towers to support an AI-driven expansion drew a legal appeal and prompted the city's first data-center construction moratorium in March 2026. Water bills obtained by WBZ-TV in June 2026 show Markley reporting 60,000–120,000 gallons of water use per day over the prior year." }, { "slug": "markley-one-summer-street", "name": "Markley Group – One Summer Street", "operator": "Markley Group", "town": "Boston", "state": "MA", "lat": 42.3545151, "lon": -71.0595422, "lifecycle_stage": "operating", "capacity_mw": 30, "capacity_source_url": "https://datacenterhawk.com/marketplace/providers/markley-group/1-summer-street/112368", "cooling_type": null, "cooling_source_url": null, "sq_ft": 920000, "year_built": 1998, "summary": "The largest multi-tenant telecommunications \"carrier hotel\" in New England, home to more than 90 carriers and network providers. Markley Group purchased the building in 1997 and opened it as a carrier hotel and data center in 1998, three years before Markley's Lowell facility, giving it the longest continuous operating history of any facility tracked on this site." }, { "slug": "ne-edge-killingly", "name": "NE Edge – Killingly", "operator": "NE Edge LLC", "town": "Killingly", "state": "CT", "lat": 41.8465, "lon": -71.8876, "lifecycle_stage": "proposed", "capacity_mw": null, "capacity_source_url": null, "cooling_type": null, "cooling_source_url": null, "sq_ft": null, "year_built": null, "summary": "Town of Killingly authorized sale of this parcel plus two adjacent parcels to NE Edge LLC for $5M. Land acquisition stage — no site plan, permits, or construction timeline published yet." }, { "slug": "ne-edge-waterford", "name": "NE Edge – Waterford (Millstone)", "operator": "NE Edge LLC", "town": "Waterford", "state": "CT", "lat": 41.3103, "lon": -72.1678, "lifecycle_stage": "status_uncertain", "capacity_mw": 300, "capacity_source_url": "https://ctexaminer.com/2023/02/16/ne-edge-proposes-1-5m-square-foot-data-center-at-millstone/", "cooling_type": "closed_loop_chilled_water", "cooling_source_url": "https://ne-edgedatacenters.com/nuclear-powered-data-center-planned-in-connecticut/", "sq_ft": 1500000, "year_built": null, "summary": "Proposed 300 MW / 1.5M sq ft campus co-located with Millstone Nuclear Power Station. Host fee agreement signed March 2023 ($231M over 30 years) required building permits by March 2026. CT Siting Council denied a key petition in Jan 2024 amid community and legislative opposition. The March 2026 permit deadline has passed with no confirmed permit as of this writing — status uncertain, not confirmed cancelled." }, { "slug": "og-industries-beacon-falls", "name": "O&G Industries – Beacon Falls", "operator": "O&G Industries", "town": "Beacon Falls", "state": "CT", "lat": 41.439, "lon": -73.057, "lifecycle_stage": "under_construction", "capacity_mw": 32, "capacity_source_url": "https://www.datacenterdynamics.com/en/news/construction-firm-gains-approval-for-32mw-data-center-in-beacon-falls-connecticut/", "cooling_type": null, "cooling_source_url": null, "sq_ft": 294164, "year_built": null, "summary": "Two-story, 294,164 sq ft facility on 47 acres of a former sand mine, approved unanimously by Beacon Falls residents in 2022. Under construction as of 2026. Includes an on-site fuel cell for power." }, { "slug": "nne-energy-sanford", "name": "Sanford Woods Industrial and Technical Campus", "operator": "Northern New England Energy Company", "town": "Sanford", "state": "ME", "lat": 43.410928, "lon": -70.7411551, "lifecycle_stage": "status_uncertain", "capacity_mw": null, "capacity_source_url": null, "cooling_type": null, "cooling_source_url": null, "sq_ft": null, "year_built": null, "summary": "Proposed 1,060-acre \"Sanford Woods Industrial and Technical Campus\" along the Mousam River in south Sanford, publicly detailed in February 2026. The developer, Northern New England Energy Company, is a distinct entity from Northern New England Energy Corporation, the Vermont utility subsidiary of Energir, which has confirmed it has no connection to this project. Reported proposed capacity has ranged from 100-300 MW; no site plan, capacity commitment, or cooling details have been published, so no water-use estimate is shown. A three-month emergency moratorium on new data-center permits, imposed by the Sanford City Council on May 19, 2026, has since paused the project, though city officials describe it as still active." }, { "slug": "hanton-city-smithfield", "name": "Smithfield Data Center", "operator": "Hanton City Investments LLC", "town": "Smithfield", "state": "RI", "lat": 41.91702, "lon": -71.520176, "lifecycle_stage": "status_uncertain", "capacity_mw": null, "capacity_source_url": null, "cooling_type": null, "cooling_source_url": null, "sq_ft": null, "year_built": null, "summary": "Proposed business park with a data center as anchor tenant, on several hundred acres of woodland off Douglas Pike, behind Fidelity Investments' corporate campus and across from Bryant University. Developer Hanton City Investments LLC filed its application on May 4, 2026 -- one day before Smithfield's Town Council voted 4-1 to ban data centers outright in every zoning district. Whether the filing is grandfathered ahead of the ban is expected to be settled in court." }, { "slug": "tierpoint-waterbury", "name": "TierPoint – Waterbury", "operator": "TierPoint", "town": "Waterbury", "state": "CT", "lat": 41.554366, "lon": -73.0410751, "lifecycle_stage": "operating", "capacity_mw": 1, "capacity_source_url": "https://cloudandcolocation.com/datacenters/tierpoint-waterbury-data-center/", "cooling_type": "air_cooled", "cooling_source_url": "https://www.datacentermap.com/usa/connecticut/waterbury/xand-waterbury/", "sq_ft": 30000, "year_built": null, "summary": "An existing, small colocation facility occupying a single floor of an office building in downtown Waterbury — a fundamentally different category from the large new-build campuses driving Connecticut's current data center boom. Included for completeness, but it does not have a comparable water-use footprint or public water-impact record, since it draws on the host building's shared utilities rather than dedicated on-site cooling infrastructure." }, { "slug": "servistar-westfield", "name": "Westfield Data Center Campus", "operator": "Servistar Realties LLC", "town": "Westfield", "state": "MA", "lat": 42.1582277, "lon": -72.7410311, "lifecycle_stage": "status_uncertain", "capacity_mw": 274, "capacity_source_url": "https://www.bostonglobe.com/2026/07/14/business/westfield-data-center-backlash-healey/", "cooling_type": "closed_loop_chilled_water", "cooling_source_url": "https://www.cityofwestfield.org/CivicAlerts.aspx?AID=1724", "sq_ft": 2740000, "year_built": null, "summary": "The largest data center campus proposed in New England -- 10 buildings, up to 274 MW at full build, approved with a 40-year tax abatement in 2021. The project went quiet for years and Servistar's LLC was administratively dissolved in late 2024 for failing to file annual reports, leading some outlets to call it abandoned. A June 2026 update from Westfield's mayor said it was still progressing, and a July 2026 Boston Globe report described active resident backlash. The City Council passed a one-year moratorium on new data centers on July 6, 2026, but it does not affect this already-approved project." } ]