White meter heating: what the RTS switch-off means

White meter heating systems are older multi-rate electricity meters designed to charge different rates for peak and off-peak consumption, primarily for electric heating. This guide explains how these systems work, the implications of the Radio Teleswitch Service (RTS) switch-off, and how modern alternatives like smart meters offer greater control over energy usage.

Transitioning from older heating systems to modern energy solutions can simplify your home's energy management. Fuse Energy offers clear pricing and in-app usage data to help you understand and control your energy consumption. Click here to switch to Fuse Energy today.

Understanding white meter heating

White meter heating refers to an older electricity metering system designed to take advantage of cheaper off-peak electricity, primarily for heating purposes. These systems are common in properties, particularly older ones, where electric storage heaters or immersion heaters are the main source of warmth.

How white meters function

A white meter is a multi-rate electricity meter that records electricity consumption at different prices depending on the time of day. It has at least two registers: one for peak-rate electricity (usually during the day) and another for off-peak electricity (typically overnight). The meter automatically switches between these registers, allowing users to consume electricity for heating when it is cheaper. This setup was historically beneficial for charging storage heaters overnight, which then released heat throughout the day.

Historical context and benefits

White meters became popular in the mid-20th century, offering a way to balance the electricity grid by encouraging consumption during periods of lower demand, primarily overnight. This allowed energy companies to utilise their power generation capacity more efficiently. For homeowners, the main benefit was access to significantly cheaper electricity rates during specific hours, reducing the cost of heating their homes, especially with storage heaters.

Drawbacks of older systems

While historically beneficial, older white meter systems come with several drawbacks today. They often lack the precision and real-time data of modern meters, making it difficult for homeowners to accurately track their energy usage and costs. The tariffs associated with these meters can also be less flexible, and the reliance on fixed off-peak windows means users must adapt their energy habits to the meter's schedule. Furthermore, the technology controlling some of these meters is being phased out, necessitating a transition to newer systems.

The Radio Teleswitch Service (RTS) switch-off

The Radio Teleswitch Service (RTS) is a system that has controlled many multi-rate electricity meters, including some white meters, for decades. It uses a longwave radio signal to switch between peak and off-peak rates.

What is an RTS meter?

An RTS meter is a type of electricity meter that relies on RTS to manage its different tariff rates. These meters are typically multi-rate, meaning they record electricity consumption at varying prices depending on the time of day or night. The RTS signal tells the meter when to switch between these rates, enabling appliances like storage heaters to charge during cheaper off-peak periods.

Why RTS is being phased out

RTS is an outdated technology that has become increasingly difficult and costly to maintain. As part of the national smart meter rollout programme, the energy industry is moving towards more modern, digital solutions for managing electricity tariffs. Phasing out RTS allows for a more efficient and responsive energy system, offering greater flexibility and control for both suppliers and consumers.

Timeline and what to expect

The industry-wide phase-out of RTS meters began on 30 June 2025, with the service being switched off permanently soon after. If you have an RTS meter, your current energy supplier is responsible for replacing it with a smart meter at no additional cost to you. This upgrade is mandated by Ofgem, the energy market regulator, as part of the national smart meter rollout programme. You should expect your supplier to contact you to arrange this replacement.

Transitioning to smart meters

Moving from an older white meter or RTS meter to a smart meter is a crucial step towards modern energy management.

The smart meter advantage

Smart meters offer several advantages over traditional meters. They automatically send meter readings to your supplier, eliminating the need for manual submissions and estimated bills. This provides accurate billing and helps you see your energy usage in near real-time. With a smart meter, you can also access a wider range of modern tariffs, including those with more dynamic pricing structures that reward you for using electricity when it is cheapest and greenest. This greater visibility and control can lead to more informed energy choices and potential savings.

Your free smart meter upgrade

If you have an RTS meter, your current energy supplier will replace it with a smart meter for free. This is part of a nationwide initiative to upgrade all eligible meters. The upgrade ensures you can continue to access multi-rate tariffs and benefit from modern energy management tools. Energy suppliers are mandated to provide this upgrade at no cost to the customer.

Preparing for installation

When your supplier contacts you to arrange a smart meter installation, they will provide details on what to expect. Typically, an engineer will visit your home to remove the old meter and install the new smart meter. The process usually takes a couple of hours, and your electricity supply will need to be temporarily switched off during the installation. Ensure there is clear access to your existing meter and that someone aged 18 or over is present during the appointment.

Optimising your energy use

Even before upgrading to a smart meter, there are steps you can take to manage your energy consumption effectively.

Reading your meter accurately

Understanding how to read your multi-register white meter is key to tracking your usage. These meters typically have two or more displays or sets of dials. One register records peak-rate usage, and another records off-peak usage. Note down the numbers from each register at regular intervals, such as weekly or monthly, to monitor how much electricity you are using during different periods. This helps you understand your consumption patterns and verify your bills.

Maximising off-peak savings

If you currently have a white meter, make the most of your off-peak hours. Schedule high-energy activities, such as running washing machines, dishwashers, or charging electric vehicles, for these cheaper periods. For homes with electric storage heaters, ensure they are set to charge fully during the night-time off-peak window to maximise heat retention for the day. Simple habits like using timers for appliances can help you align your energy use with the lowest rates.

Exploring modern tariffs

Once you have a smart meter installed, you can explore a wider range of modern tariffs. Many suppliers offer time-of-use tariffs that provide cheaper electricity during specific off-peak windows, similar to white meter tariffs but often with more flexibility and better rates. Some tariffs are designed for electric vehicle owners, offering very low rates for charging overnight. The average UK home uses around 2,700 kWh of electricity per year, so choosing the right tariff can significantly impact your annual energy costs.

Embracing modern energy management with Fuse

Fuse aims to transform the complexity and anxiety of white meter heating into an opportunity for control and simplicity for UK homeowners. We encourage customers not to settle for outdated energy systems or confusing tariffs.

Transparent usage and control

Fuse's app provides transparent usage data and in-app control, empowering homeowners to understand and manage their energy consumption after transitioning from a white meter. You can see your energy use in clear, understandable terms, helping you make informed decisions about when and how you use electricity. This digital control puts the power to play with your energy back in your hands.

24/7 human support

Navigating energy changes, including meter upgrades and new tariffs, can be daunting. Fuse offers round-the-clock human customer support, providing reassurance and assistance whenever you need it. Our team is available 24/7 to help you with any questions or concerns, ensuring a smooth transition and ongoing peace of mind.

Your path to smarter energy

Fuse champions modern smart meter technology as a crucial step towards a more efficient and responsive energy system, moving beyond legacy white meter systems. While Fuse cannot switch customers with an RTS meter until their current supplier has replaced it with a smart meter (as RTS meters are an unsupported meter type for switching), we are ready to welcome you once your upgrade is complete. Embrace modern, digital-first energy management for greater control and a simpler energy experience. Switching to Fuse is quick and easy, often taking just 5 working days.

Ready to take control of your home energy? Switch to Fuse Energy today and experience clear pricing, real-time usage data, and 24/7 human support. Our digital-first approach is designed to make managing your energy simple and transparent. Click here to get started. You can also learn more about our mission to make energy abundant by clicking here.