What is MHHS? A Simple Guide for UK Businesses
The UK electricity market is undergoing one of its biggest changes in decades through the introduction of Market-Wide Half-Hourly Settlement (MHHS).
If you've never heard of MHHS before, you're not alone. Despite the technical name, the concept is actually quite simple.
The industry is moving away from estimated electricity consumption patterns and towards actual usage data collected every 30 minutes. The aim is to create a more accurate picture of how electricity is used across the UK, helping suppliers better understand demand and paving the way for more innovative energy products in the future.
Below, we'll explain what MHHS is, why it's being introduced and what it could mean for your business.
What is MHHS?
MHHS stands for Market-Wide Half-Hourly Settlement.
In simple terms, it changes how electricity usage is measured across the market.
Historically, many electricity supplies have been managed using estimated consumption patterns. Under MHHS, the industry will increasingly use actual half-hourly consumption data collected from smart and advanced electricity meters.
Rather than relying on assumptions about when electricity is being used, suppliers will have access to a more accurate picture of real consumption patterns throughout the day.
For businesses, this represents a shift towards a smarter, more data-driven electricity market.
Why Is MHHS Being Introduced?
The way electricity is generated and consumed has changed significantly over the last decade.
Renewable generation, battery storage, electric vehicles and smart technologies are becoming increasingly common across the UK. As the electricity system evolves, the industry requires more accurate data to understand when electricity is being used and how demand changes throughout the day.
By using actual half-hourly consumption data, suppliers can forecast demand more accurately, purchase energy more efficiently and develop products that better reflect how businesses consume electricity.
The overall objective is to create a more efficient and flexible electricity market that is better suited to the way energy is used today.
What Could MHHS Mean for Businesses?
For most businesses, MHHS will happen largely in the background. However, there are several ways it could influence the energy market in the years ahead.
Better Visibility of Energy Usage
Half-hourly data provides a much clearer understanding of when electricity is being used throughout the day.
For businesses with smart or advanced metering, this can provide valuable insight into consumption patterns, helping identify inefficiencies, peak demand periods and opportunities to improve operational efficiency.
Understanding when energy is used can often be just as valuable as understanding how much energy is used.
More Innovative Energy Products
One of the key objectives of MHHS is to support greater innovation within the energy market.
As suppliers gain access to more accurate consumption data, businesses may see greater availability of tariffs and services that better reflect actual usage patterns.
For example, businesses that have flexibility over when they use electricity may benefit from future pricing structures that reward consumption outside of peak demand periods.
While these products won't be suitable for every business, they could create new opportunities for organisations looking to better manage their energy costs.
A Smarter Electricity Market
MHHS is designed to improve the quality of data used throughout the electricity market.
More accurate consumption data helps suppliers better understand demand, improve forecasting and make more informed purchasing decisions.
Although MHHS won't directly reduce electricity costs, it is expected to contribute towards a more responsive, transparent and efficient market over time.
Do Businesses Need to Do Anything?
For most businesses, no immediate action will be required.
The transition is being managed by suppliers, metering providers and other industry participants. If any changes are required to your metering arrangements, your supplier will typically contact you directly.
Many businesses already have the metering infrastructure needed to support the transition.
When Is MHHS Happening?
The industry-wide migration to MHHS is already underway and is expected to continue through to 2027.
The changes are being introduced gradually across millions of electricity supplies to ensure a smooth and controlled transition.
Final Thoughts
Although Market-Wide Half-Hourly Settlement sounds complex, the principle behind it is straightforward.
The electricity market is moving away from estimated consumption patterns and towards actual usage data.
While most businesses are unlikely to notice any immediate impact, MHHS represents an important step towards a smarter and more data-driven energy market. Over time, the improved visibility and accuracy it provides may support greater innovation, improved energy management and new opportunities for businesses to better understand and control their electricity usage.
At Shoto Energy, we continue to monitor developments across the energy market and help businesses navigate industry changes with confidence.