To pay a gas bill online, visit the company's website, log in to your account, and go to the bill payment page. The exact process varies depending on the company.
The company may require you to register for an account before paying your bill. Otherwise, you should be able to look up and pay your bill online using your account number. Acceptable payment methods vary, but commonly accepted methods include paying through a bank account or with a credit card.
One-time and recurring payments are typically available. After signing up for recurring payments, your account is automatically charged for each bill. Companies may allow partial or full bill payments.