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RTS meters were introduced in the 1980s and rely on long-radio signals of the BBCs transmitter to switch meters between peak and decrease rate.
However, the equipment that sends the signal from the transmission station in Droitwich in Worcestershire is almost outdated and will be eliminated on 30 June.
Energy suppliers try to encourage people with RTS meters to replace them with more modern smart meters, since a campaign is being conducted by TV presenter Lorraine Kelly.
But 600,000 RTS meters remain in England, Scotland and Wales – which means that electricity and hot water supply can stop functioning in those houses after the deadline.
The Regulator Vangem pusht energy companies to ensure that the switch is completed on time, but fears about smart meters are thought that some people are reluctant.
Households can have an RTS meter if they have a switch box near their energy meter with the label 'Radio Teleswitch', or have electric or storage heaters. RTS meters are also found if there is no gas supply to the area, or in rural areas or in a block of flats.
Those who get cheaper energy at different times of the day can also be influenced, also at rates such as 'Economy 7', 'Economy 10' or 'Total heat total control'.

RTS Meters were introduced in the 1980s and trust in Longwave -Radio Signals (Stock Picture)
A campaign for the switch was launched in January by a Task Force set up last year, including OFEM and Trade Group Energy UK, supported by National Energy Action and Energy Action Scotland of the consumer groups.
This emphasized the 'urgent need for RTS customers to book the installation of a new meter as soon as their energy supplier contacts them'.
Orgem said at the time that it expected that suppliers would transfer 100,000 customers who used RTS every month until June, of which it was feasible under the current plans.
All customers should have contacted their supplier at the end of last year and 300,000 RTS meters were switched last year.
Orgem warned in the campaign: “Not acting can lead to the heating and/or hot water constantly being left on or off, or the charging at the wrong time of the day, which leads to higher accounts.”
Customers were told that they will not be charged for their meter replacement and must be aware of scams, given that no payment details must be requested when booking an appointment.
In a campaign video, Kelly explains what the RTS service is and how households and companies can identify whether they have an RTS meter.
It is amid to worry about some charities that fears about smart meters of people can be immeasurable to get rid of their RTS meter.
Anindita Sarkar, from the Citizens Advice Bureau in Reading, said the BBC that people 'worried' about smart meters, even though they usually worked well '.

The equipment that the signal broadcasts for RTS meters from the Droitwich (photo) broadcasting station in Worcestershire is almost outdated and it will be eliminated on 30 June
She added: “It is technology, so maybe it has interruptions, but if they work well, smart meters have many advantages.”
Dhara Vyas, Chief Executive of Energy UK, said: 'Energy suppliers work closely with consumer groups and the Vangem regulator to encourage customers with Radioteleswitch (RTS) meters to perform now to upgrade their meter.
'Suppliers continue to do everything they can to contact customers to ensure that they have a fast and seamless upgrade and can offer households extra support that it needs.
“Contact their supplier to arrange a replacement – without extra costs for the customer – will minimize the disruption as quickly as possible, help to ensure a smooth upgrade to a smart meter and to mean that customers continue to enjoy the benefits they are currently receiving from their RTS meter.”
And Danni Barnes, director of development and partnerships at National Energy Action, said: 'Radio Teleswitch (RTS) meters are often used with aging electric heating systems that occur more often in areas that experience serious fuel poverty.
'The elimination can worsen the costs for households that are already struggling and cause households to lose control of their heating and hot water. In the worst cases, some may not be able to use their heating or hot water at all.
'It is crucial for everyone with an RTS meter to urgently contact their supplier to change their meter. Equally important is supporting people in our communities who might miss the confidence to do this themselves. '

The Zendstation in Droitwich was opened in the 1930s, but RTS Meters was launched in the 1980s
In Scotland, from October last year, more than 165,000 households and companies still used RTS meters, with the Northern Isles, Argyll and Berwickshire the most affected.
Frazer Scott, Chief Executive of Energy Action Scotland, said: 'It is vital that the consciousness of the closure of the radioteleswitch is increased both rapidly and broadly, because it has been offering controls for decades that offer warmth and hot water to houses in Scotland with electric heating.
'If it stops, people without heat can be left or powerless to prevent accounts from having their heating.
“We insist on everyone, customers, landlords and local, regional and national charity institutions to respond to the campaign to ensure that no individual and no household are endangered without and in danger.”
The BBC does not have the RTS, but supplies the signal from its channels next to the Radio 4 Longwave frequency.
A department for energy security and spokeswoman from Net Zero said: 'We work closely with OFGEM and energy suppliers to upgrade meters and to ensure that the transition is as smooth as possible for consumers.
'There are now 37 million smart and advanced meters in houses and small companies in Britain, which means that 65 percent of all gas and electricity meters are released. These help consumers to give more control over their energy and save money on their accounts. '
And a spokesperson for the Ofem said: 'The RTS-Upgrade program is about consumer welfare. Ensure that customers maintain control of their heating and hot water when the aging 40-year infrastructure that the RTS signal has been reduced.
'In most cases, smart meters are the best replacement for RTS meters opening access to new money-saving rates, although we expect suppliers to consider a series of solutions to ensure that customers reach a measurement and payment arrangement for them.
'Customers have to talk to their supplier to understand all available options.
'OFGEM draws up a task force in addition to Energy UK, which brings together suppliers and the wider sector to speed up progress and to resolve complex technical barriers that are set in certain remote regions.
“Orgem has also demanded action plans of each supplier, which we are currently investigating to ensure that robust unforeseen circumstances are present to protect customers who continue to protect on RTS meters after the switch-off date.”