+1A meter can allow you to move to a tariff like octopus agile, normal rate during day, cheap at night. It's definitely saving me money.
many of the longer fixed contracts are only accessible with a smart meter too - they are subsidising the tarif to fulfill government install obligations from the non-smarters,
probably some monetization of the telematics too
As for the IHD accompanying the smart meter I still want one where you can download to a smartphone/computer 5 minute usage to see accurately cooking/big-unit useage.