A key IT project at the heart of the national smart meter roll-out programme is facing further delays.
The government has confirmed that the communications infrastructure which links smart meters to energy suppliers will now not be ready until the Autumn.
The system was due to be switched on on Wednesday.
The government says the system, which automatically sends meter readings to energy suppliers, is now due to go live at the end of September.
The government wants every home and business to be offered a smart meter by the end of 2020. That requires 53 million meters to be fitted in over 30 million premises over the next four years.
The meters will measure gas and electricity use and automatically send meter readings to energy suppliers, ending manual meter readings.
A new body, the Data and Communications Company (DCC), was set up to create the infrastructure to handle all that information.
But the huge IT project has suffered a series of delays.
It was originally expected to be operational in 2015. That was put back a year until April 2016 and then further delayed until this August.
As recently as last month the government told the BBC that the DCC would go live on 17 August.
But the Department of Business, Energy and Industrial Strategy (BEIS) now says that’s been delayed until next month at the earliest.
A BEIS spokesperson said: “The new infrastructure is planned to go live at the end of September, it is currently being tested to deliver a long-lasting, world class system to bill payers.”
Many in the industry had expected the switch-on of the DCC to be put back.
But confirmation of the delay was met with exasperation by an insider at one of the big six energy suppliers.
“It’s yet another delay in what’s been a drawn out and badly managed project that we are rapidly losing confidence in,” he said.
The government insists that the delay won’t hold up the roll-out of smart meters. Some 3.6 million have been installed to date in homes and businesses across Britain.
But this latest setback has consequences for any of those households that want to move to a cheaper supplier as they will lose the smart functionality if they switch.
When the DCC system is operating, that will no longer happen. So its a crucial building block of the roll-out programme.
The DCC body is a wholly owned subsidiary of Capita, the outsourcing and business services firm.
While the cause of the latest delay remains unclear a spokesperson for DCC said: “As indicated by the Department, the timetable for the roll-out of the new infrastructure will allow for testing of the system to ensure that it will deliver a long-lasting and effective system.”