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.

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

Explore ways to pay, receive and manage your UI bill. Pay your bill online or learn about other ways to pay using our mobile app, AutoPay, or pay offline.

SupportView customer service phone numbers and other important contact information for residential and business customers.

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.

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 …

Start, stop and transfer your electrical services in greater New Haven and Bridgeport area with UI. Our quick and easy process ensures you can manage your services in just a few steps.