Apparently the UK government estimated that in 2016 and 2019 the average household saved £11 on their bill due to this feedback from smart meters. This page estimates the cost at £15 so 2/3rds is recovered just from that effect.

There's no way it only cost £15 in total to install a smart meter. The cost of the meter has to be at least that much and then you have paying a guy to actually install it (which in my case took 3 attempts and caused a gas leak, which took 4 or 5 guys several hours to fix - although hopefully that's unusual).

From a cursory search:

£88 to £143 installation cost in the 2019 analysis. [3:p.21] Smart meter hardware cost £36 to £120 [3:p.22]

£67 to £107 installation cost in the 2016 analysis. [2:p.12] £15 (in home display) + £44 electric + £57 gas + £29 comms equipment costs [2:p.10]

[1] https://assets.publishing.service.gov.uk/media/5a7f59f9ed915...

[2] https://assets.publishing.service.gov.uk/media/5a7f2f8b40f0b...

[3] https://assets.publishing.service.gov.uk/media/5d7f54c4e5274...

15 pounds cost per year, 11 pounds saving per year, for an average user.

Not sure how many years the cost is assumed to be spread over and what the ongoing running costs are but that's the per average customer cost apparently.

Ah, my bad. 15 per year is more plausible

Hard to tell, they are all new now, eventually they will all be old. Then we will know what it really costs.

It also took 3 attempts for me but they never showed up.