Smart meters are NOT the same as pre-payment/key meters (although they
can be
set to pre-payment).
I wouldn't assume that's what was meant though, if that wasn't explicitly stated - more likely it's JUST a smart meter!
Key meters were ALWAYS more expensive, disgracefully so - I
think that was banned a few years ago, though (effectively, literally charging more to people who were already likely to be worse off) - but I very much doubt they're actually
cheaper.
More likely that
moonsi til 's vendors meant that - IF all else is equal (in terms of the rates you pay and standing charges etc) - you are just less likely to get the build up over the year that DD's can cause, where the energy companies like to randomly up your monthly DD after the winter for eg, despite the fact that the costs will even out over the summer months ('so you won't get into debt') which means they eventually end up holding on to a large wodge of your own money - them owing YOU instead of the other way around.
Tbf, it's obviously tricky to work out exactly how much energy you are likely to use over a whole year, in a new property - but that's easy enough to keep an eye on over the course of a year and with annual statements - especially if you DO have a smart meter that will be sending automated readings (but which is NOT a pre-payment meter
).
I have probably made that sound a million times more complicated now.
I would just assume it's a Smart meter and not worry about it.
They might set your rate according to the vendors usage (and this is all assuming you don't change your provider, too
) and that will probably be higher if they were a couple (double the baths for eg) but then you just keep an eye on your own actual usage, over time.