Given them one star as you can't give less. Currently in dispute with them as I brought to their attention that I hadn't had a bill for over 18 months and was over £1700.00 in credit. They cannot bill u for energy used over 12 months old so in theory, only need to Bill me for the last 12 months. They are now trying to tell me I have used nearly £3000.00 in energy in the last year and that I am in debit to them for £700. Have started the switch today to go elsewhere. This is meant to be going through ombudsman who quite honestly, are nearly as bad! Don't go to npower!