Bear in mind that, if you don't pay your bill - or if the energy company thinks you haven't paid your bill (maybe confusing you with another similar address), they can cut off your supply with the push of a button at their end; no need for anybody to gain access to your property at all.
Also (and I realise that I will be called a tin-foil hat-wearer for this), social credit will be introduced to the UK at some point. No need for the government to spend money on adverts to try to persuade you to use less energy, when they can just give the utility companies permission to cut off the supply to a specific appliance in your house from their end, if they deem that you've used it too much.
With the Internet Of Things, it will eventually be possible for your energy company to know exactly which appliances you're using and when. Nothing will be anonymous, so they'll know if you spend 'too much' time (and power) on watching TV, gaming, using your tumble dryer even when it's a perfectly dry day, leaving lights on when it's bright and/or you're out, boiling your kettle too often meaning that you're drinking 'too much' coffee, maybe opening your fridge door too often could flag up as a sign that you or somebody in your household may be snacking too much.
I agree with MrsDanvers: they've been pushing it so forcefully, often telling you outright lies, that it makes you wonder for whose benefit it all is.
Compare it with something like smartphones: nobody ever had to fiercely urge everybody to get one, because people can clearly see how convenient and useful they are (albeit not without privacy concerns), meaning that most people rush out to buy them of their own accord.
I also agree with MossStitch: you don't fatten a pig by constantly weighing it. I may not be the Brain of Britain, but I do realise that turning all of my appliances and heating off will reduce my bills... but then I won't be able to use my appliances whilst making the saving. The same as I know I could save a fortune in council tax if I sold my house and went to live in a bus shelter...