Was only with EDF energy for one month as I moved into a new house and initiated a switch to a new, cheaper, supplier pretty quickly. A month after the switch we get a ludicrous bill of over £500 for a one month period. I live in a medium sized terrace house with one housemate, and currently pay £67 for gas & electric combined. Common sense would indicate to anyone that the bill was incorrect. I was annoyed at the audacity of the bill but was somewhat calmed by the agent on live chat who was polite. The issue stemmed from them making estimates, once I provided our move in meter readings I was told the problem would be sorted. Fast forward to 3 weeks later, a similar electricity bill arrives for over £500. Still based of estimates. Absolute joke and waste of my time. I give them the benefit of the doubt that it's just sheer incompetence. However, I do worry how many people end up paying these completely ridiculous bills without checking. As mentioned, common sense would have told edf that that amount was incorrect. Glad I switched from them and will never in my life be switching back.