UK 30-minute energy change explained

The UK energy market is undergoing a significant transformation with the introduction of Market-wide Half-Hourly Settlement (MHHS), often referred to as the UK 30-minute energy change. This regulatory reform, led by Ofgem, fundamentally alters how electricity consumption is recorded and settled across Great Britain, moving away from estimated usage to precise, Half-Hourly data. This is not merely a compliance exercise but a crucial step towards a future of abundant, dynamic, and intelligent energy, aligning with a vision of power to play with.

The UK's 30-minute energy change aims to make energy billing more accurate and transparent. Fuse Energy is committed to helping you navigate these changes, offering clear pricing and tools to understand your energy use. Switch to Fuse Energy today and take control of your energy bills by clicking here.

Understanding the UK's 30-minute energy change

Market-wide Half-Hourly Settlement is a major energy market reform mandated by Ofgem, the UK's energy regulator. It represents one of the most significant changes to the UK electricity market in over 25 years.

What is market-wide Half-Hourly settlement (MHHS)?

Market-wide Half-Hourly Settlement (MHHS) means that electricity usage is measured and accounted for in 30-minute intervals. Historically, much of the UK's electricity usage was settled based on estimated consumption profiles or infrequent meter readings. The new MHHS system replaces this with a data-driven approach, using actual Half-Hourly data to match the electricity suppliers buy with what you use in near real-time. This shift from estimated to precise, Half-Hourly data is a cornerstone of modernising the energy grid.

Why is this change happening now?

The primary goal of the 30-minute energy change is to create a more accurate, efficient, and flexible electricity market. By having precise data on when electricity is used, the system can better match supply with demand. This helps to integrate more renewable energy sources, as their output can fluctuate, and supports the UK's net-zero goals. Ofgem is driving this reform to foster innovation, reduce waste, and give consumers more control over their energy use. This reform is expected to deliver significant net benefits for consumers in Great Britain.

How the 30-minute settlement works for you

The move to 30-minute settlement fundamentally changes how your energy usage is tracked and billed, opening up new possibilities for managing your home's power.

The essential role of smart meters

Smart meters are fundamental to benefiting from the 30-minute energy change. These devices automatically record and send your energy usage data in Half-Hourly intervals to your supplier. Without a smart meter, your consumption would still be estimated or require manual readings, preventing you from accessing the benefits of time-of-use tariffs. A smart meter provides the essential data link between your home and the modernised energy grid.

The Radio Teleswitch Service (RTS), a legacy meter type that uses a radio signal to switch between peak and off-peak rates, is being phased out. The industry-wide switch-off began on 30 June 2025, meaning these meters are being retired and replaced with smart meters. If you have an RTS meter, your current supplier will replace it with a smart meter at no extra cost.

Impact on energy billing and dynamic tariffs

With MHHS, energy suppliers can use precise Half-Hourly data to bill customers based on actual usage rather than estimates. This leads to more accurate bills and a clearer understanding of your consumption patterns.

This granular data also enables dynamic time-of-use tariffs. Unlike traditional fixed-rate tariffs, these tariffs vary the cost of electricity based on the time of day, reflecting real-time wholesale prices, grid demand, and renewable generation levels. Prices can be lower during off-peak hours, such as overnight or when renewable generation is high, and higher during peak demand times.

Benefits and opportunities for households

The 30-minute energy change empowers you to take a more active role in managing your energy, leading to tangible benefits.

Greater accuracy and transparency in billing

One of the most immediate benefits is the significant reduction in estimated bills. With Half-Hourly data, your energy bills will reflect your actual consumption, providing greater accuracy and transparency. This means you pay for exactly what you use, when you use it, eliminating surprises and making it easier to budget.

Access to dynamic time-of-use tariffs

Dynamic tariffs offer the opportunity to save money by shifting energy-intensive activities to periods when electricity is cheaper. For example, you could charge an electric vehicle, run a washing machine, or use a dishwasher during off-peak hours, significantly reducing your energy costs. Some dynamic tariffs can even offer negative prices, meaning you get paid to use electricity during times of high renewable generation.

Empowering demand flexibility and savings

The ability to respond to price signals through dynamic tariffs fosters demand flexibility. By adjusting your energy habits, you not only save money but also contribute to a more stable and efficient National Grid. This flexibility helps balance supply and demand, particularly important with increasing amounts of intermittent renewable energy sources like wind and solar. The average UK home uses around 2,500 kWh of electricity per year, a benchmark set by Ofgem's medium Typical Domestic Consumption Value (TDCV) effective from 1 July 20261. Understanding your usage in 30-minute blocks can help you make informed decisions to reduce your overall energy spend.

Preparing for the new energy landscape

To fully embrace the opportunities presented by the 30-minute energy change, a few proactive steps can make a significant difference.

Ensuring you have a smart meter

A smart meter is essential to access the benefits of Half-Hourly settlement and dynamic tariffs. If you do not have one, contact your current energy supplier. They are responsible for replacing legacy meters, including RTS meters, with smart meters. This upgrade is typically free of charge.

Choosing a forward-thinking energy supplier

Not all energy suppliers are equally equipped to help you leverage the 30-minute energy change. Look for a supplier that offers:

• Dynamic or time-of-use tariffs: designed for the new settlement system.
• Intuitive tools: such as a mobile app, that provide clear, real-time data on your Half-Hourly energy usage.
• Support and guidance: to help you understand and adapt to the new system.

Adapting your energy habits for optimisation

Once you have a smart meter and a dynamic tariff, adjusting your energy habits becomes key to maximising savings. Consider:

• Shifting high-consumption activities: Use appliances like washing machines, tumble dryers, and dishwashers during off-peak hours when electricity is cheaper.
• Charging electric vehicles: If you have an EV, schedule charging for overnight or other low-price periods.
• Smart home automation: Explore devices that can automate energy usage based on real-time price signals, making optimisation effortless.

Fuse Energy and the future of UK power

Fuse Energy is built for the modern energy landscape, designed to help you thrive with the UK's 30-minute energy change.

Leveraging smart technology for control and insights

Fuse's digital-first approach and smart meter integration are specifically designed to leverage the precision of 30-minute settlement. Our all-in-one app provides clear, real-time data and intuitive tools for you to understand your Half-Hourly usage patterns. This empowers you to optimise consumption and save money effortlessly.

Seamless switching and dedicated support

Switching to Fuse Energy is designed to be a hassle-free experience. We offer a seamless digital switching process and provide 24/7 human customer support to assist you in navigating the complexities of new energy tariffs and smart meter functionalities enabled by the 30-minute change.

Your power to play with

The 30-minute energy change empowers customers to actively engage with their energy usage, aligning perfectly with Fuse's vision of providing 'power to play with'. We believe in an energy future where abundance, not scarcity, is the norm. By offering dynamic tariffs and smart insights, Fuse helps you unlock the full potential of this new era, giving you greater control and making your energy work smarter for you.

Managing your energy bills should be clear and easy to understand. Fuse Energy focuses on straightforward pricing, so you can see exactly what you are paying without unnecessary complexity. If you have a smart meter, you can view detailed usage data through the app or website, helping you understand how you can lower your bills. Our 24/7 human support team is always on hand with fast response times whenever you need help. Click here to switch to Fuse Energy today. Find out about our mission by clicking here.

References

1. Ofgem. Review of Typical Domestic consumption values