United Illuminating provides safe, reliable electric service to customers in the greater New Haven and Bridgeport areas of Connecticut.

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Welcome to United Illuminating! Whether you’re a new, returning or current customer, we’re happy to serve you. We work hard to make sure your needs receive the highest priority.

UI is engaged in the purchase, transmission, distribution and sale of electricity and related services to approximately 338,654 residential, commercial and industrial customers in the greater New Haven …

Mail a Payment The United Illuminating Company P.O. Box 847818 Boston, MA 02284-7818

United Illuminating (UI) is a wholly-owned subsidiary of AVANGRID, Inc. View the most current financial information, including quarterly and annual filings at AVANGRID.com.

Below is a complete listing of UI’s current schedule of rates and riders as approved by the Public Utility Regulatory Authority (PURA). We've made it convenient for you to view and/or print a PDF of any …

Find help paying your energy bill from UI. Learn about our low-income discount rate, financial hardship assistance, payment arrangements, and state programs.