Connecticut has not yet produced a state-specific large-load tariff. Connecticut ratepayers are instead exposed to data center-driven cost pressure indirectly, through the same regional New England Transmission Owners FERC return-on-equity dispute affecting Massachusetts, Rhode Island, Maine and New Hampshire — where a March 2026 FERC order set a lower base ROE and required refunds, while transmission owners have separately proposed an 11.39 percent forward-looking ROE partly justified by data center-driven grid investment.
Also active in Connecticut: Without a dedicated tariff, a large load locating in Connecticut currently negotiates under standard commercial and industrial rate schedules — worth confirming directly with Eversource or United Illuminating before assuming Virginia- or Ohio-style minimum-take terms apply.
Figures compiled from the Edison Electric Institute's "Large Load Projects and Tariffs" (September 2026) member-company summary and public regulatory filings. Confirm current tariff terms directly with Eversource / United Illuminating and the relevant state public utility commission before relying on any figure for a capital decision.
Weighing Connecticut against another state or a Canadian province with a different rate and interconnection picture entirely? Run both sides of the comparison through our licensed AI data center cost configurator — it applies each jurisdiction's actual power rate, tax treatment and large-load tariff rules to the same seven build configurations.
