New smart energy meters being installed in Welsh homes could save customers about £64 a year each by ending estimated bills, British Gas says.
The company says the meters – which the UK government requires to be installed in all homes by 2019 – will save Wales’ 1.3 million households £83m a year.
It has started supplying them to more than 142,000 homes in Cardiff.
Smart meters automatically send data on power use to suppliers, ending the need for manual meter readings.
They are due to be installed in 30 million UK homes by 2019, as well as businesses.