Service Area

Service Area

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 342,928 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.

Company Profile Sheet

For more information, visit


List of Towns We Serve

  • Ansonia
  • Derby
  • East Haven
  • Hamden
  • Milford
  • New Haven
  • North Branford
  • North Haven
  • Orange
  • West Haven
  • Woodbridge
  • Bridgeport
  • Easton
  • Fairfield
  • Trumbull
  • Shelton
  • Stratford
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