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

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

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.

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.

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.

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.

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