maximum amount that dual fuel customers can be charged per year if they pay by direct debit and they use an average amount of energy. of course some people will pay more. your supplier has to send you a notification if your bill is going up, and they have to tell you how much your direct debit is being changed by. if you haven't already had one of those letters or e—mails, the chances are you will by the end of the week. we caught up with moira, who found at her bill will go up moira, who found at her bill will go up by a lot more than she was expecting. we've had an email from our supplier that tells us to expect at least a £60—a—month increase, based on the fact that it could go up by — our bill could go up overall by 75% on what we pay now. and we've already seen increases over the last year — some of which based on working at home, obviously — we're here more, we're using more energy. but our energy bills have been going up for the last year. they've just gone up again and, with the cap in april, they will be going up again.