@Cornz 1Re: Hmm,
I'm with you on this.
But since the frequencies are likely to be co-share (they are in other countries) a small transmitter on the control channel should suffice.
It's not the energy efficiency that concerns me but rather that Plod and company can make use of this information from knowing when you arise to when you turn in and, even, when you go for a tinkle in the middle of the night. Very useful for some investigations or planning the optimum time to make an arrest.
In the US consumers can decline the fitting of these meters.
I can, and do, look after my fuel economy - even had the supply company come around and change the meter on a couple of occasions as they thought I was diddling the meter.
One thing you can rest assured of is these are being installed for the benefit of the supply utilities and NOT the consumer.
Here in VietNam, EVN (Electricity VietNam) encourages solar water heating and electricity generation. They even hand out information to assist people convert.
My home, offices and two small hotels are all wired for 240V as well as 12V DC - and most all light fittings use PWM controls.
If Toronto, Canada, can usefully employ solar collectors - why not the UK?