Smart Meters have one purpose only, to give control to the power companies. What they do not tell you is that ALL smart meters have A 'Remote Disconnect' facility. This is exactly what it says, it is a means for the power company to disconnect your electricity without having to come to your house and disconnect the meter, they can do it from their computer system.
They say that this will only be used in a 'power shortfall emergency' , in other words if there is a power shortage they will disconnect ordinary households to make what power there is available to vital services like Hospitals, public services and essential industry.
However they have been forced to admit that they can also use it to change you to another tariff , prepayment, if you get into arrears on your bill.
Smart meters also 'ration' power by charging different rates at different times. For example they charge the highest rate at peak times , lunch hour and 4 to 7pm on weekday evenings. This is when demand for power is high from homes but industry is still using it as well. Of course they say this is to help you 'save money' by changing the times you use the most power!