Have you got, or does the Go-Electric tariff require a Smart Meter to be fitted? I am currently having a (polite at the moment - 4 months and no resolution yet) argument with EDF about the Smart Meter they have installed. It appears to be metering reactive power as well as real power, resulting in an annual increase in my electricity bill of £200 over what the old meter was recording. It's a highly technical argument about how AC power works, but it only came to my notice because I have a Tesla Powerwall 2. Tesla Energy are very interested and will be sending their engineers to investigate soon, it sounds like it's not an isolated case either. However, EDF are saying there is nothing wrong - without even visiting to make the site assessment that I have requested. Other Smart Meter's are definitely recording correctly, I have figures from another Powerwall owner who is with Octopus. It may not amount to a great deal of extra power unless you have a lot of AC motors and switch mode power supplies - common in modern electronics. However, it could just possibly be an insidious way of getting more money out of customers without their noticing - or am I being overly suspicious?.