To the OP, all I can say is DO NOT agree to have a smart meter installed. Why? Because anything the government is 'pushing' is never in 'your best interest'!
Additionally the smart meters can learn a lot about your activity: when you're out (usage goes down) to exactly the 'time' you use electricity. The whole idea behind Economy7 was to use 'cheaper' electricity at night. But how they know if you DO switch on at night, is a mystery, as nothing as far as I'm aware (correct me if I'm wrong, as I've not had electric heating at any point myself) can indicate when you decide to use your heating.
Additionally hackers will be able to 'see' when you're home too, and when you're out, by your energy usage, and plan the best time to visit. This will become more important as people struggle financially, and crime rises even higher (sorry to paint a bleak picture, but I'm living in the real world).
HOWEVER, that said, the smart meters know exactly what you're doing and when, or you wouldn't be able to 'see' how well (or not) you're doing. They don't save ANY money directly, but instead rely on people watching their energy usage carefully, and of course there is naturally a tendency to therefore use less.
But something no one has yet mentioned, is the radiation/EMF being emitted from the smart meter! WiFi, 5G and electronic devices that surround us, are in fact making us sick, whether or not the suppliers know. I'd be will to say the people they employ to 'push' these devices, aren't ever trained on the harm they cause, or they'd find it more difficult to recruit. But there is a plethora of information out there (if you know where to look) to support this. Mobile phone manufacturers actually advise people NOT to hold their phone against their ear or head, but 1.5" or 3cm away. It's still not ideal, as your hand still gets the EMF; and putting headphones on only shoves the EMF down the wires into your brain. The best thing (if not walking or out somewhere) is to put the phone onto a chair or table, away from you, on speaker, or if private, then you can use 'AirTubes' (a small speaker in a tube, powered via a wire until the speaker, and then relying on the air in the tube to get the sound to your ears thereafter). However, how often DO you see people holding a phone away from their head? But anyway, I digress!
The whole idea of smart meters IS (as has been said) to enable them to turn off your supply remotely. The only time they'd forcibly try to install a smart meter, is if you're in payment arrears, but anything other than that they simply cannot force you.
But the 'electrosmog' those meters put out has severe adverse effects on some people (electro-sensitive); and those who don't have noticeable reactions, will still be stressing their bodies, and who knows what the effects will be further down the road. Best not even indulge these companies - but they WILL push them, over and over again, as the government is paying them to! Telling them it's 'green' and all that claptrap.
I can recommend Dr Mercola's book titled 'EMF**d', for anyone who'd like to know more.
I think also, that when they start putting energy caps in place, or restricting supplies at certain times, once again they'll be able to remotely do this. DO not trust the energy companies or government.
In closing I would also like to put the cat among the pigeons: Our utility bills should be 'free' anyway, as our government did a deal with the people after the war, for reparations of the time when they forcibly confiscated our precious metals. I'm in the process of dealing with this myself now, having been shafted left right and centre by our governments and local authorities. There are many reasons to now take action and push back, because they have CAUSED all of this inflation. So this is my way of taking back what they stole from me in the first place!