Now, the supplier has a comprehensive list of your waking hours; sleeping hours night time meanderings. Whether you are at home or not at home. In the more modern house, what you took out of your fridge and what you put into your fridge.
This is marketing gold and you can be very sure the suppliers will be selling this information to marketing people for data mining.
I say, no more smart meter talk until we see legislation in place that will seriously curtail how information collected can be used. Protection of privacy before smart meters!