United Illuminating (UI) is a subsidiary of AVANGRID, Inc. (NYSE: AGR). Established in 1899, UI is engaged in the purchase, transmission, distribution and sale of electricity and related services to approximately 341,000 residential, commercial and industrial customers in the greater New Haven and Bridgeport areas of Connecticut.
UI’s service territory includes 17 Connecticut towns and cities in an area totaling 335 square miles along or near the shoreline of Long Island Sound.
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