Green Mountain Energy offers various payment methods to accommodate its customers. Typically, customers can pay their bills through options such as online payments via the company website, automatic bank drafts, and payments made through mobile apps. Additionally, customers may have options for paying by check or money order. Those who prefer traditional methods may also be able to pay in person at authorized locations. It is important for customers to check the specific payment options available in their area, as these may vary based on location and individual circumstances. To gain the most accurate and up-to-date information regarding accepted payment methods, customers are encouraged to visit the current web page of Green Mountain Energy, where details about payment options and procedures are likely provided.