Its all
about preparing for the various nuclear/coal fired power stations to go end of life.
Once you've go everyone installed with smart meters , its a doddle to turn off individual houses to reduce demand on the power generation infrastructure. especially during winter when it wont be able to cope.
Gonna be fun when you jump on your spiffy new HS2 train for a jaunt upto Birmingham and be told "Due to power restrictions this train will be limited to 40 mph"... or the more fun to be had at 2am when the power comes back on and everyones washing machines/dishwashers start up.....
But then you got to look at the government decisions and wonder what the f*** are these people on?
Smart meters cost 10 billion quid to deploy over 10 years, or buying 2 off the shelf french nuclear power stations for the same amount over 10 years and not having to need smart meters......