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A radio teleswitch is a device used in the United Kingdom primarily to allow electricity suppliers to switch large numbers of electricity meters between different tariff rates, by broadcasting an embedded signal in broadcast radio signals. Radio teleswitches are also used to switch on/off consumer appliances to make use of cheaper differential tariffs such as Economy 7.
Some suppliers also offer more sophisticated heating control using the radio teleswitch network. For example, Scottish Power 'Weathercall' and SSE's 'Total Heat Total Control' both dynamically vary the length of time storage heating is energised each night depending on the forecast temperature for the following day to help maintain a consistent household temperature.
Teleswitching has also been used to help level out demand in areas where the supply network is close to capacity. In the 1990s, MANWEB used such a system to provide different households with different off-peak periods on a weekly alternating basis. By spreading out the high peak demand associated with electric storage heating in Mid Wales, the company avoided upgrading costs of over a million pounds, and £200,000 a year in reduced use-of-system charges.
In the north of Scotland, the radio teleswitch service is also used to help control the local electricity distribution network for resilience purposes.
The database defines how each group of teleswitches belonging to the user-company will control the loads and meter registers connected to it. The CTCU uses the database and certain rules to generate and control a continuous string of messages, which is forwarded to the BBC for transmission.
Although each message will be received by all installed teleswitches, the unique user and group-codes carried by the message ensure that only teleswitches carrying the same combination of codes will act on it.
The idea of phase modulating control and data signals onto the low frequency carrier wave used for broadcasting the BBC Radio 4 programmes was tested. The BBC was satisfied that there was no discernible distortion of its broadcast service and no infringement of its Royal Charter.
The technique won the Queen's Award for Technology, while its application for controlling consumer tariffs and loads was approved by the Home Office. The project was funded by the CEGB and the mainland electricity boards, which were each allocated one of sixteen message channels. One channel was reserved for testing and the final one was allocated to Northern Ireland when it joined the project.
The Central Teleswitch Control Unit (CTCU) system was updated in 2007 to replace the obsolete computing hardware with brand new, modern, fully supported equipment. The old DEC MicroVAX machines were replaced with HP Integrity 2660s. The operating system has also been upgraded to OpenVMS 8.4. No effort has been made to upgrade the obsolete transmitter hardware. All communications lines have also been updated and Internet access has been introduced in addition to the dial-in access by modem.
The new system went live at the end of January 2008 and the update has markedly improved the performance and stability of the system.
In 2016, it was reported that over 1.6 million teleswitches were in use. Around 190,000 were reported as being used dynamically to control loads such as heating on a day-to-day basis, with the remainder following generally fixed switching times that were updated less frequently.
In early 2020, 1.4 million electricity meter 'MPAN' locations were thought to still be using radio teleswitching – although the actual number of individual premises may have been lower as some single-household installations use two MPAN references for historical technical reasons.
By the end of May 2025, the number of radio teleswitch meters left in service had reduced to 314,395.
In October 2011, the BBC stated that the Droitwich transmitter, including Radio 4's longwave service and Radio Teleswitch, will cease to operate when one of the last two valves breaks, and no effort would be made to manufacture more nor to install a replacement longwave transmitter.
The BBC stated that their plan is simply to cease broadcasting on longwave forever once the Droitwich transmitter fails. It has been reported that the BBC estimated that fewer than ten spare compatible valves existed in the world, and that each valve had a working life of between one and ten years.
A 50 kW longwave transmitter transmitting a 1000 Hz wide signal could take over the teleswitch role with adequate nationwide coverage—but some legal provision would probably have to be made to make this possible.
In 2016, the Energy Networks Association consulted on the future of the service, highlighting that no agreement for its operation past the end of 2017 existed. While most suppliers acknowledged the system could ultimately be replaced by smart meter functionality, there was general agreement that the system would need to continue until at least 2020 to avoid significant inconvenience to customers and agreement was secured for the service to continue until the end of March 2020.
Several further extensions have been negotiated between the Energy Networks Association and the BBC from 2019 onwards, due to the lack of progress in developing suitable smart meter alternatives. In late 2020 SSE, one of the major users of the service, began informing its customers that teleswitched meters would be withdrawn and replaced with alternative solutions.
The availability of radio teleswitching has been progressively extended and as of early 2021 the service was due to remain in operation until at least March 2024. By that date, however, the radio frequency (in England) was expected to be switched off in summer 2025.
As of October 2024, there were 800,000 Radio Teleswitch meters remaining to be replaced, with the RTS system due to be switched off on 30 June 2025. In January 2025, the RTS Taskforce launched an advertising campaign to encourage customers to have their meters upgraded. On 19th June, the Department for Energy Security and Net Zero announced that "a widespread switch-off ... will not happen on 30 June", the service being phased out in stages instead.
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