Where to pay your United Illuminating bill
United Illuminating offers several ways to pay your bill, and the fastest route depends on whether you want to pay right now or set up automatic payments. You can pay online through your account, by phone, by mail, or in person at a payment location.
The online method is usually quickest: log into your UI account at uicc.com, find your bill, and pay with a bank account or debit card. If you prefer the phone, call 1-800-UI-LIGHT (1-800-845-4444) and have your account number ready. Payments made online or by phone typically post within one business day.
If you want to mail a check, write your account number on the back and send it to the address printed on your bill. Mail payments take longer — usually 7 to 10 days — so plan ahead if your due date is soon. UI also accepts payments at authorized payment locations in Connecticut; check the UI website for the nearest one to you.
Key Takeaways
- Online payment through uicc.com is the fastest method and posts within one business day.
- Phone payments at 1-800-UI-LIGHT require your account number but work if you do not have internet access.
- Mailed checks take 7 to 10 days to post, so send them early if your due date is approaching.
- Setting up automatic payments through your UI account prevents missed due dates and takes just a few minutes to arrange.
- Late payments trigger a reconnection fee if your service is shut off, so paying by the due date shown on your bill matters.
Setting up automatic payments to avoid late fees
Automatic payments remove the risk of forgetting a due date. Log into your UI account, go to the payment settings section, and choose to pay automatically each month on a date you pick. You can use your bank account (which costs nothing) or a debit card (which may carry a small fee depending on the payment processor).
Once automatic payments are set up, UI withdraws the amount due on the date you choose. You can change the payment date or pause automatic payments anytime through your account. If your bill amount changes significantly — for example, after a rate change or seasonal adjustment — check that the automatic amount still makes sense for you.
What happens if you miss your due date
Your bill shows a due date, usually about 20 days after the bill is issued. If you do not pay by that date, UI adds a late fee to your next bill. The fee amount varies but is typically a percentage of the unpaid balance.
If you remain unpaid for about 30 days past the due date, UI sends a disconnection notice. This notice gives you a window to pay before your service is shut off. If your service is disconnected, you must pay the full unpaid balance plus a reconnection fee to restore power. Reconnection fees are separate from late fees and add up quickly, so contacting UI as soon as you know you cannot pay on time is worth doing.
Payment plans if you cannot pay the full amount
If you owe money and cannot pay it all at once, UI offers payment plans. Contact UI directly at 1-800-UI-LIGHT to discuss your situation. The company can set up a plan that spreads your balance over several months, which stops disconnection and gives you time to catch up.
Payment plans require you to pay on time each month going forward, or the plan can be cancelled and disconnection proceedings can restart. If you are struggling with your bill, also ask about UI's hardship programs or low-income assistance — some may reduce your monthly costs or offer one-time bill help.
Understanding your bill due date and grace periods
Your bill shows two important dates: the issue date and the due date. The due date is when UI expects payment. Connecticut does not have a legal grace period for utility bills, which means a payment is technically late if it arrives even one day after the due date.
However, UI typically does not charge a late fee immediately if you pay within a few days of the due date. The safest approach is to pay by the due date shown on your bill. If you pay by mail, send it at least 10 days early to account for mail delivery time.
Paying a bill from a previous address
If you moved and want to pay an old bill, call UI at 1-800-UI-LIGHT with your former address and account number. The company can tell you whether the account is still open and accept payment over the phone. Do not send a check to an old address — it may not reach the right department.
If you moved out of UI's service area entirely, the company may have already closed your account. Ask whether you still owe anything and what the payment address is. Some old bills can be paid online if you still have access to your account, but calling is faster for past-address situations.
Paying online without logging into your account
If you do not have an online account set up yet, you can still pay through the UI website without logging in. Go to uicc.com and look for the "Pay Without Logging In" or "Guest Payment" option. You will need your account number (found on your bill) and the amount you want to pay.
Guest payments work the same way as account-based payments and post within one business day. After you pay, you will receive a confirmation number — save this for your records. If you plan to pay regularly, setting up a full account takes just a few minutes and lets you see your usage history and set up automatic payments.
Frequently Asked Questions
Can I pay my UI bill with a credit card?
UI does not accept credit cards directly, but you can use a debit card online or by phone. Some third-party payment processors allow credit card payments for a fee, but this fee comes out of your pocket and is not worth the cost for most bills.
What time of day does my automatic payment go through?
UI does not may provide a specific time, only that the payment posts on the date you choose. The actual withdrawal may happen anytime that day. If you are timing a payment to match when money arrives in your account, schedule it for the day after your paycheck, not the same day.
Do I need to create an online account to pay my bill?
No. You can pay by phone, mail, or through the guest payment option on the UI website without an account. However, an account lets you see your bill online, track usage, and set up automatic payments, which most people find convenient.
What if my payment was rejected?
A rejected payment usually means the bank account or card information was incorrect or your account had insufficient funds. UI will notify you, and the payment will not post. Contact UI at 1-800-UI-LIGHT to confirm what went wrong and try again with corrected information.
Can I pay someone else's UI bill?
Yes. Call UI at 1-800-UI-LIGHT with the account number of the bill you want to pay. You can pay by phone using your own payment method. Online, you can use the guest payment option and enter the account number you want to pay toward.