Hi Neil,Have reviewed your response and can advise as follows.Call me paranoid, but I did delete my Account Number as I could not see that it served any purpose in your calculations. Clearly it did mess with your program file.Confirm the hot water system does come on each night plus on occasion we set the dishwasher to come on late at night. Other than that, there are no other items that consume high amounts of power.Admittedly the whole basis of my question was based on just 1 month of readings ...