Subnational jurisdiction · as of 2026-09-06
Connecticut runs data-center siting and construction through the same general-purpose permitting spine every other land use follows: local zoning approval, a Connecticut Siting Council certificate where a project's own generating capacity or grid interconnection crosses the statute's size thresholds, a state environmental impact evaluation where a state agency's own approval or funding is part of the project, and a Department of Energy and Environmental Protection air permit for backup generator fleets.
What distinguishes Connecticut is a dedicated, generous incentive: a 2021 special-session act lets the Commissioner of Economic and Community Development certify a qualified data center for a twenty-year, extendable to thirty-year, exemption from the state's property and sales and use taxes, conditioned on a negotiated fee paid to the host municipality in place of the property tax it forgoes.
5 instruments on record, grouped by the family of approval each one governs.
Who decides whether a data center may occupy a site, and through what approval?
Applies to both
Authorizes a municipality's zoning commission to regulate the height, size, and use of buildings and the density and use of land, including the district-by-district and special-permit or special-exception approvals a data center project proceeds under at the local level. The zoning enabling act has been amended many times since its original enactment and carries no single commencement date to cite.
Source: Full text of law
What impact review must precede approval, and who leads it?
Conn. Gen. Stat. Secs. 22a-1a to 22a-1h
Applies to government
Requires each state agency, department, and institution to prepare an environmental impact evaluation before undertaking or approving an action that may significantly affect the environment. The duty binds the state actor rather than a private data center developer directly, so it reaches a data center project only where a state agency's own approval, funding, or land is part of that project.
The Connecticut Environmental Policy Act has been amended several times since its 1973 original enactment and carries no single commencement date to cite for the duty as it stands today.
Source: Full text of law
What authorizations govern grid connection and onsite generation?
Applies to both
Requires a certificate from the Connecticut Siting Council before constructing an electric transmission line of 69 kilovolts or more, an electric generating or storage facility above the statute's size thresholds, or a substation or switchyard that may have a substantial adverse environmental effect.
A data center itself is not a listed facility type, but a new bulk transmission line, substation, or on-site generating capacity built to interconnect or power one falls within the council's certification jurisdiction if it meets these thresholds. The Siting Council statute has been amended many times since its original enactment and carries no single commencement date to cite.
Source: Full text of law
What permits govern backup generators and ongoing emissions?
Applies to both
The Department of Energy and Environmental Protection permits the construction and operation of an air contaminant source under regulations adopted pursuant to this section; a data center's backup generator fleet permits under these new and modified source rules. The air permitting statute has been amended many times since its original enactment and carries no single commencement date to cite.
Source: Full text of law
What fiscal agreements attach a data center to its host jurisdiction?
2021 Conn. Pub. Acts 21-1, Sec. 1 (H.B. 6514, Feb. 2021 Spec. Sess.)
Effective 2021-07-01 · Applies to private
In effect since July 1, 2021. Lets the Commissioner of Economic and Community Development enter a certification agreement exempting a qualified data center's owner, operator, and colocation tenants from the property tax under Chapter 203 and the sales and use tax under Chapter 219 of the general statutes.
The exemption runs twenty years from the agreement's effective date, extendable to thirty years where the qualified investment reaches two hundred million dollars in an enterprise zone or federal opportunity zone, or four hundred million dollars elsewhere, and requires a negotiated host-municipality fee agreement before construction may begin.
Colocation tenants meeting the higher investment threshold are also exempt for thirty years from any state financial transactions tax on trades of stocks, bonds, derivatives, and other financial products.
Source: Full text of law
Every entry cites the instrument it describes. None of it is legal advice: verify a citation before relying on it. Full sourcing: read the methodology. The rest of the record: all jurisdictions.