United Illuminating (UI) — Southern Connecticut Utility
United Illuminating is an electric distribution utility serving customers in southern Connecticut, particularly in New Haven and Fairfield counties. It maintains the local electric grid — including power lines and substations — and is responsible for restoring service during outages.
About United Illuminating
Established in the late 1800s, United Illuminating is a long-standing electric utility and a subsidiary of Avangrid, responsible for maintaining local electric infrastructure across southern Connecticut. UI delivers electricity to customers in parts of Fairfield and New Haven counties.
In deregulated areas of Connecticut, United Illuminating delivers electricity while customers can choose an independent supplier to provide the electricity itself. UI handles all physical delivery, including poles, wires, substations, and outage management — separately from any supplier relationship.
Major Areas Served
Choosing a Supplier in UI Territory
Customers in United Illuminating's service area can select a competitive electricity supplier for the supply and billing portion of their electricity service. UI's delivery infrastructure, outage response, and meter reading remain unchanged. Our AI reviews all available options in southern Connecticut to find the best fit for your home or business.
Quick Facts
- Founded: Late 1800s
- Service: Southern Connecticut (Fairfield & New Haven counties)
- Subsidiary of Avangrid
- Role: Delivery only — supply is competitive
UI Delivers — You Choose Who Supplies
Southern Connecticut customers in UI territory can choose from competitive electricity suppliers. Our AI finds the most cost-effective plan for your Bridgeport or New Haven area home.