United Illuminating Co
Energy Supply & Distribution
(203) 499-2367 157 Church Street, PO Box 1564, New Haven, CT 06506, USA Open in Maps
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 333,000 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.