Payments may be made by Visa, Master Card, AMEX, Discover, E-CHeck by logging into My Account. You may also call in your Credit Card or E-Check info or mail a check to us PO Box 127 Stowe, VT 05672. Power Shift is striving to GO GREEN and encourage all customers to use either Credit Card, E-Check, or Email Billing. There is a $2.00 fee for paper statements.