If you are a customer of United Illuminating Company, you have several options to make your monthly UI payment. You can pay:
- Online: and make your payment.
- By Mail: Send your payment to the following address: The United Illuminating Company, P.O. Box 9230, Chelsea, MA 02150-9230.
- By Phone: Note there is an extra fee to pay by phone. The phone number to call is .
- In Person: You can pay your bill at .