Where and how to pay your New Mexico gas bill
Most New Mexico gas customers pay through their utility company's website, by phone, or by mail. The exact payment methods available depend on which gas company serves your address — the two largest are Atmos Energy (which serves most of the state) and Southwest Gas (which serves parts of southern New Mexico). Both accept online payments, automatic bank transfers, credit or debit cards, and checks by mail.
The fastest way to pay is online through your utility's customer portal. You log in with your account number (found on your bill), enter the amount you want to pay, and choose a payment date. The payment usually posts within one to two business days. If you prefer not to go online, you can call your gas company's payment line and speak to someone, or mail a check to the address printed on your bill.
If you set up automatic payments, your bill is deducted from your bank account on the same date each month. This prevents accidental late payments and takes the guesswork out of remembering when the bill is due. You can change or cancel automatic payments anytime through your account settings or by calling customer service.
Key Takeaways
- Atmos Energy and Southwest Gas are the two main gas providers in New Mexico, and each has its own payment website and phone number.
- Online payments through your utility's website are the fastest option and usually post within one to two business days.
- Automatic payments prevent late fees and can be set up or cancelled anytime through your online account or by phone.
- If you cannot pay your full bill, contact your gas company before the due date to ask about payment plans or hardship programs.
- Late payments trigger fees and can result in service disconnection, so paying on time protects both your wallet and your access to gas.
Finding your account number and due date
Your account number appears in the top right corner of your gas bill, usually next to your name and service address. The due date is printed near the top or bottom of the bill and is typically 15 to 20 days after the bill is mailed. If you cannot find your bill, you can look up your account number by logging into your utility's website or calling customer service with your name and address.
Knowing your due date matters because payments received after that date trigger a late fee. Most New Mexico gas companies charge between $10 and $25 for late payments, depending on your bill amount. If you are more than 30 days late, the utility may send a disconnection notice and eventually shut off your gas service.
Setting up online payments through Atmos Energy or Southwest Gas
To pay online with Atmos Energy, visit atmosenergy.com, click "Pay My Bill," and select New Mexico as your state. Enter your account number and zip code, then create a login or sign in if you already have one. Once logged in, you can see your current balance, payment history, and usage. Click "Make a Payment," choose your payment amount and date, and select your payment method (bank account, debit card, or credit card).
Southwest Gas customers go to swgas.com and follow a similar process. Click "Pay My Bill," enter your account number, and log in or create an account. The website shows your balance and lets you schedule a payment for today or a future date. Both companies allow you to save your bank account or card information so future payments are faster.
If you run into trouble logging in, both utilities offer a phone payment line. Atmos Energy's number is on your bill; Southwest Gas's is also printed there. A representative can help you reset your password, look up your account, or process a payment over the phone.
Paying by phone or mail if you do not use online banking
To pay by phone, call the number on your bill and have your account number ready. A representative will ask how much you want to pay and which bank account or card to charge. Phone payments are processed the same day and usually post within one to two business days. Some utilities charge a small fee for phone payments — typically $2 to $5 — so ask before you confirm.
To pay by mail, write a check or money order, include your account number on the back, and mail it to the address printed on your bill. Mail payments take longer to reach the utility — usually five to seven business days — so send your check at least a week before the due date to avoid a late fee. Do not send cash through the mail.
What to do if you cannot pay your full bill on time
If you know you cannot pay by the due date, contact your gas company before that date arrives. Most utilities offer payment plans that let you split your bill into smaller installments over two to four months. You will not face a late fee if you are on an approved payment plan and make each installment on time.
New Mexico also has programs for customers facing hardship. Atmos Energy and Southwest Gas both participate in the Low Income Home Energy Assistance Program (LIHEAP), which helps pay heating bills for households below a certain income level. To learn whether you may be may be able to access, contact your local Community Action Agency or call 211 (a free helpline that connects you to local resources). LIHEAP typically covers part or all of your bill, depending on your household income and size.
If you are behind on your bill, ask about a deferred payment agreement. This arrangement lets you pay part of what you owe now and the rest over several months without disconnection. The utility must offer this option if you are facing a hardship, though terms vary by company.
Understanding late fees and disconnection
A late fee is added to your bill if payment is not received by the due date. In New Mexico, late fees are typically a percentage of your bill (often 1 to 2 percent) or a flat amount, whichever is greater. This fee is added to your next bill, so if you do not pay it, it compounds.
If your bill remains unpaid for 30 days or more, the utility sends a disconnection notice. This notice gives you a deadline — usually 10 to 15 days — to pay or set up a payment plan. If you do not respond, the company can shut off your gas service. Reconnection requires paying the full overdue balance plus a reconnection fee, which can be $50 to $150 or more.
During winter months (typically November through March), New Mexico has cold weather protection rules that limit when utilities can disconnect service. Even if you are behind on your bill, the company cannot shut off your gas during this period if you are making a good-faith effort to pay or if you are working with the utility on a payment plan. Once the protection period ends, disconnection becomes possible again.
Checking your payment history and account balance
Log into your online account to see when each payment posted, how much you paid, and what your current balance is. This record is useful if you ever dispute a charge or need to prove you paid on time. You can also download or print your payment history from the website for your records.
If you notice a payment did not post when you expected, wait two business days. Online and phone payments usually take that long to clear. If more than two business days have passed and the payment still does not show, call customer service with the date and amount of your payment. They can trace it and confirm whether it went through.
Frequently Asked Questions
Can I pay my New Mexico gas bill with a credit card?
Yes, both Atmos Energy and Southwest Gas accept credit and debit cards online and by phone. Some utilities charge a processing fee for credit card payments — typically 2 to 3 percent of the amount paid — so ask before you confirm. Paying with a debit card usually has no fee.
What happens if I pay online but the payment does not show up?
Online payments typically post within one to two business days. If yours has not appeared after two business days, log into your account and check the payment status. If it shows as pending, wait another day. If it shows as failed, try paying again or call customer service to find out why it did not go through.
Can I set up automatic payments and then cancel them later?
Yes. You can cancel automatic payments anytime through your online account or by calling customer service. If you cancel before the payment is processed, it will not be charged. If you cancel after the payment has already posted, you cannot reverse it — you would need to contact the utility to discuss a refund or credit.
What is the difference between a payment plan and a deferred payment agreement?
A payment plan lets you split your current bill into smaller monthly payments over two to four months. A deferred payment agreement is used when you are behind on your bill and lets you pay part of the overdue amount now and the rest later, usually over several months. Both prevent disconnection if you stick to the agreed schedule.
Do I have to pay a reconnection fee if my gas is shut off?
Yes. If your service is disconnected for non-payment, you must pay the full overdue balance plus a reconnection fee to have gas restored. Reconnection fees in New Mexico typically range from $50 to $150, depending on the utility and whether the reconnection happens during business hours or after hours.