Where to pay your National Grid Long Island bill
National Grid Long Island offers four main ways to pay your bill: online through their website, by phone, by mail, or in person at a payment location. The fastest and most convenient option for most people is online payment through the National Grid website or mobile app, which processes immediately and costs nothing extra.
If you prefer to speak with someone, you can call National Grid's payment line at 1-800-752-6633. A representative can take your payment over the phone using a debit card, credit card, or bank account. Payments made by phone are processed the same day if you call before 5 p.m. Eastern Time on a business day.
Mail payments should be sent to the address printed on your bill — do not send payment to the National Grid corporate office. Mail typically takes 7 to 10 business days to arrive and be processed, so plan ahead if your due date is approaching. In-person payment locations exist at select National Grid offices and authorized payment centers on Long Island, though these are less common than they once were.
Key Takeaways
- Online payment through the National Grid website or app is free, immediate, and available 24 hours a day.
- Phone payments at 1-800-752-6633 process the same day if you call before 5 p.m. on a business day, but credit card companies may charge a convenience fee.
- Mail payments take 7 to 10 business days to process, so send them at least two weeks before your due date to avoid a late fee.
- Your account number and bill amount are the only information you need to make a payment by any method.
- Late fees apply if payment is not received by 5 p.m. on the due date shown on your bill.
Setting up automatic payments to avoid late fees
Automatic payment, called Budget Billing or AutoPay by National Grid, removes the risk of missing a due date. You authorize National Grid to withdraw payment from your bank account or charge your card on the due date each month. The withdrawal happens automatically, and you receive a confirmation email.
To enroll in AutoPay, log into your National Grid account online, go to the "Billing" or "Payment" section, and select "Enroll in AutoPay." You will need your bank routing number and account number, or a valid debit or credit card. The enrollment takes about five minutes and begins with your next billing cycle.
You can change or cancel AutoPay at any time through your online account, and you will receive notice before each scheduled payment. If you want to dispute a charge or stop a payment, contact National Grid at 1-800-752-6633 at least three business days before the due date.
Understanding your bill due date and grace period
Your bill due date is printed on the front of your bill statement, usually 20 to 25 days after the bill is issued. National Grid does not offer a formal grace period — payment must be received by 5 p.m. Eastern Time on the due date to avoid a late fee. "Received" means the payment has cleared National Grid's system, not the date you send it.
If you pay by mail, the postmark date does not matter; only the date National Grid receives and processes the payment counts. This is why mailing a payment within a few days of the due date is risky. If you cannot pay by the due date, contact National Grid immediately at 1-800-752-6633 to discuss your options before the late fee is applied.
What happens if you miss a payment
A late fee is added to your account if payment is not received by the due date. The amount of the late fee varies but is typically a percentage of your bill or a flat fee — check your bill or account online to see what National Grid charges. The late fee appears on your next bill.
If your bill remains unpaid for 30 days past the due date, National Grid may send a disconnect notice warning that service will be shut off if payment is not made within a specified timeframe, usually 10 to 15 days. A service disconnection fee applies when the power is turned off, and you must pay the full outstanding balance plus the disconnection fee to have service restored.
If you are struggling to pay, contact National Grid before you fall behind. The company offers payment plans for customers who cannot pay in full, and may have programs to help with bills if you meet income requirements. Call 1-800-752-6633 to discuss options.
Using the National Grid website and mobile app
The National Grid website (nationalgridus.com) and mobile app let you view your bill, make one-time payments, set up AutoPay, and check your account balance without calling. Log in with your account number and password, or create an online account if you do not have one yet.
To create an account, visit the National Grid website, click "Create Account," and enter your account number (found on your bill) and zip code. You will receive a verification code by email or text. Once verified, you can set a password and log in anytime.
The mobile app is available for iPhone and Android and offers the same features as the website. Many customers find the app easier for quick payments because you can save your payment method and complete a payment in under a minute. Both the website and app show your payment history, so you can confirm when past payments were processed.
Payment methods and fees
National Grid accepts debit cards, credit cards, and bank account transfers at no charge when you pay through their website or app. If you pay by phone, some credit card companies charge a convenience fee (typically $2 to $3), though debit cards and bank transfers remain free. National Grid itself does not charge a fee for any payment method.
Third-party payment services like PayPal, Venmo, or other bill-pay apps may also accept National Grid payments, but check the terms of those services — they may charge their own fees. The safest and cheapest route is always to pay directly through National Grid's website or app.
If you use a payment service that is not National Grid's official channel, confirm that the payment reached National Grid before the due date. Delays or errors with third-party services are your responsibility, and National Grid will still charge a late fee if the payment does not arrive on time.
Frequently Asked Questions
Can I pay my National Grid Long Island bill at a store like 7-Eleven or Walmart?
National Grid does not partner with major retail chains for bill payment on Long Island. Your options are online, by phone, by mail, or at a National Grid office. Some authorized payment centers may exist in your area — call 1-800-752-6633 to ask if one is near you.
What if I pay online but the payment does not show up on my account?
Online payments typically process within one business day. Log into your account and check the "Payment History" section to confirm the payment was received. If more than one business day has passed and the payment does not appear, call 1-800-752-6633 with your confirmation number (provided when you made the payment).
Can I split my bill payment between two different payment methods?
No, National Grid requires the full payment or an approved payment plan to be made through a single method. If you need to split a payment, contact National Grid at 1-800-752-6633 to set up a formal payment arrangement.
What if my bill is wrong — should I still pay by the due date?
Yes, pay the bill by the due date to avoid a late fee. If you believe the bill is incorrect, contact National Grid to dispute it, but do not withhold payment. National Grid can adjust your account after they investigate, and you will receive a credit on a future bill if an error is found.
How do I change my due date?
You can request a different due date by logging into your online account or calling 1-800-752-6633. National Grid will try to accommodate your request, though the new date must fall within the billing cycle. This is useful if your due date falls on a weekend or holiday.