My suspicion is that smart meters are for the benefit of the supplier, not the user!
We already have an energy monitor, at which we glance, occasionally. Lights are gradually changing over to LED, so energy consumption is decreasing slowly. We try to switch off other electrical devices are switched off when not need, as much as possible. So we are helping the hyped drive towards lower emissions from energy provision..
E.o N kept pestering me to have a smart meter fitted, even to the extent of writing that the meter need to be changed (Which events have shown to be untrue!, since no one has insisted that it be changed due to being time expired)
Eventually, called them and told them that I do not want a smart meter, and to stop harassing me. Since then only one pester letter.
Big brother may watch us through our credit cards, but not yet when we turn on a light!
Howard