Connecticut Utility Companies Serving The Deregulated Electricity Market

Connecticut utility companies provide the delivery of power including the maintenance of the wires and poles that serve your residence or business.


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Publicly traded Eversource (NYSE: ES) is Connecticut’s largest energy delivery company. Headquartered in Hartford and Boston, Eversource serves Connecticut, New Hampshire, and Massachusetts by providing both electricity and natural gas utility services to the region.

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United Illuminating (UI)

Headquartered in Orange, Connecticut, The United Illuminating Company (UI) handles electricity transmission and distribution for the Bridgeport and New Haven areas of the Connecticut shoreline along Long Island Sound. UI is a subsidiary of Avangrid (NYSE: AGR) and is the smaller of Connecticut’s two electric utilities.

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