The length of your contract will be decided between you and the supplier you choose. When your contract expires, you may change suppliers, keep the same supplier, or return to your local utility company as your supplier. Make sure to read your supplier contract carefully to see if there might be a fee for early termination. Canceling with a supplier and signing up with another supplier may take 1-2 billing cycles. Be aware that if you do nothing and let your contract lapse, you will be automatically returned to your local utility company as your supplier or the supplier will roll you over to a month to month energy plan. In most cases, this will increase your monthly bill.