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Loads of people don't submit meter readings and end up with wild estimates.
Such a painful problem for them that they continued to not submit readings.
I'd say it's also pretty good for giving a better handle on what is actually costing you money, and how much, for gas and electricity.
Possibly... but then what? Now you have this information, what do you do with it? In the past, any kind of action based on it was at best fiddling with the edges as the energy was so cheap. Now, I agree, fixing something horribly inefficient (like an old immersion heater) might , long term, make a material difference to your finances. But now you can get the same, or better information via a smart plug, that you own.
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Pretty often they only discover the painful issue when they get hit with some wild bill and it's too late.
You can see that your heating, tumble dryer, air con unit, mini heater, etc costs a load and use it less. You could have monitoring plugs on everything but if you're doing that you are probably already aware they cost a lot.
It should be a non-problem but it isn't. Loads of people don't submit meter readings and end up with wild estimates.
I'd say it's also pretty good for giving a better handle on what is actually costing you money, and how much, for gas and electricity.