The United Illuminating Company

  • Energy
  • Energy Delivery
157 Church St.
P.O. Box 1564. MS-60
New Haven, CT 06506
(203) 499-2000
  • About

    The United Illuminating Company (UI) is a New Haven-based regional distribution utility established in 1899. UI is engaged in the purchase, transmission, distribution and sale of electricity and related services to more than 323,000 residential, commercial and industrial customers in the Greater New Haven and Bridgeport areas. UI is owned by UIL Holdings whose nonregulated businesses include utility bill processor American Payment Systems, electrical contracting service provider Xcelecom, passive independent power plant investor United Bridgeport Energy, and venture capital firm United Capital Investments.