If you remember the rollout of smart meters back in 2011, you will know how much it changed the way we use and understand energy. For the first time since then, the UK energy market is undergoing another major transformation with the introduction of Market-wide Half-Hourly Settlement (MHHS). The transition to half-hourly metering is already underway.
The smart meter rollout in 2011 enabled automatic and more frequent data collection, paving the way for this next step. Within the next 18 months, every UK business will be billed using half-hourly data instead of estimates or manual meter readings.
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Why is MHHS Happening?
MHHS is being introduced to make the UK energy market smarter, more transparent, and more efficient through advanced metering systems. Using half-hourly data helps suppliers and businesses understand energy consumption in detail, manage demand more effectively, and reduce costs over time.
Half-hourly consumption data and half-hourly meter readings provide detailed insights for energy management and billing. Half-hourly metering will also enable businesses to analyse usage patterns, improving energy management and billing accuracy. It also reduces the need for manual meter readings, simplifying overall energy management.
Key benefits of MHHS include:
- More accurate bills based on real usage
- Access to smarter, more flexible tariffs
- Support for the UK’s Net Zero and sustainability goals
- Better insight into when and how your business uses energy
- Greater convenience through automatic half hourly readings
Half-hourly data ensures electricity bills reflect actual usage, reducing discrepancies and helping businesses manage costs. It also contributes to a more balanced and resilient energy system, supporting renewable generation and reducing pressure on the grid. These improvements allow businesses to optimise energy use and take advantage of new tariff structures. Ultimately, using a half hourly meter enables more accurate billing and detailed energy tracking for businesses.
Who Does This Affect?
MHHS applies to any business not already on a half-hourly tariff. Electricity meters will start automatically sending half-hourly data to your energy supplier. If your site already has a half-hourly meter, you’re compliant. If not, your supplier will remotely reprogram or replace your meter, usually at no additional cost. Half-hourly meters allow accurate measurement, billing, and monitoring of consumption patterns for improved efficiency.
What Changes Will You See with Half Hourly Metering?
Some administrative updates will occur:
- Your MPAN (Meter Point Administration Number) may change slightly
- Profile classes (01–04) will be updated
- A new Standard Settlement Configuration (SSC) code will replace the old Meter Timeswitch Code (MTC)
These changes won’t affect current rates or contract terms, but once your contract ends, your next agreement will move to a half-hourly tariff. Under MHHS, energy usage is measured and settled for each half-hour period, providing precise data for billing and settlement. This allows businesses to track how and when they use energy, identify savings, and make informed decisions.
Energy Efficiency and Demand Flexibility
Energy efficiency and demand flexibility are increasingly important for businesses looking to manage costs and support sustainability goals. Half-hourly metering gives access to detailed consumption data, helping businesses identify periods of peak demand, shift energy-intensive activities to off-peak times, and take advantage of lower unit rates.
High energy consumption businesses with high maximum demand or peak electricity demand are required to monitor their usage closely to avoid excess capacity charges. Businesses must also agree on a maximum import capacity and agreed capacity with their Distribution Network Operator, which affects their unit rate and the potential for excess capacity charges if their maximum demand is exceeded.
Businesses can also participate in demand flexibility programs, such as the Demand Flexibility Service, which rewards reduced energy usage during peak times. Monitoring reactive power is important to optimise costs and avoid penalties related to power quality.
Ultimately, half-hourly metering equips businesses with the tools to improve energy efficiency, manage costs, and contribute to a more resilient energy system. Whether you’re a small business or a large energy user, leveraging half-hourly data helps stay competitive and future-proof operations.
What This Could Mean for Your Business
Scenario 1 – Current fixed contract: Your contract continues as normal with rates and standing charges unchanged. Depending on your supplier’s MHHS migration schedule, a new contract may start on a half-hourly tariff, potentially including adjustments in standing charges.
Scenario 2 – Supplier cost changes mid-term: Suppliers may introduce MHHS-related charges during an existing contract. Your energy supplier will manage billing changes, which may include new charges such as excess capacity if agreed limits are exceeded.
Scenario 3 – New half-hourly contract: Moving to a half-hourly tariff may include adjustments to standing charges and charges based on maximum import or peak demand. Choosing the right energy deal is key to optimising costs under half-hourly metering.
New Smart Meter Rules from 2027
The government is planning new rules for business energy contracts. If approved, from 1 January 2027, any new fixed-term contract will require a smart or advanced meter. This means your business can’t sign a new fixed deal unless you already have a smart meter or agree to have one installed.
What This Means for Your Business
- Smart meter requirement: All new fixed-term business contracts must be smart-enabled from 2027.
- Clear communication: Suppliers will need to regularly inform customers that fixed contracts after 2027 require smart meters.
- Consumer protection: A legally binding code will ensure installations are fair, convenient, and transparent.
Why It Matters
These changes are designed to speed up smart meter adoption, improve billing accuracy, and support the UK’s Clean Power Mission. Businesses without smart meters should plan to avoid delays or complications when signing new contracts.
Next Steps
If you are unsure whether your business is ready for these changes, or you want to explore smart meter options and future-proof your energy contracts, get in touch with us today. Our team can guide you through the process, ensure your contracts stay compliant, and help you take advantage of smarter energy management.
Key Dates
- Now to 2027: Gradual rollout for all homes and businesses
- Q4 2025: MPAN updates (MTC replaced by SSC)
- By May 2027: All customers settled half-hourly (Profile 00)
How We Can Help
As your energy broker, we help you navigate and benefit from MHHS by monitoring how MHHS affects pricing and tariffs, exploring smart or flexible contract options, using half-hourly data to secure competitive renewal offers, and providing clear advice on managing capacity and costs.
Summary
MHHS represents the biggest change to energy billing in over a decade. For larger energy users with high peak demand, half-hourly meters are legally required. These meters provide detailed readings every 30 minutes, allowing precise monitoring, efficient energy management, and compliance. Non half-hourly meters, used by lower-consumption businesses, don’t offer this level of detail. MHHS brings more accurate electricity usage visibility, enabling businesses and suppliers to make smarter, data-driven energy decisions. We now await details on tariffs and standing charges under the new arrangements, but the benefits of improved visibility, efficiency, and flexibility are clear.
Common Questions
Most suppliers indicate that meter transitions to half-hourly will not alter existing rates, only how usage is recorded. It may influence the cost of future contracts.
You may need to decide whether to agree to a new contract before your meter migrates or wait until afterwards. Your meter operator may also perform updates to ensure readiness for half-hourly settlement. If you have recently moved into a new property, you should check if your current meter is suitable for your business needs and whether any upgrades or removals are required.
Half-hourly meters often have higher daily standing charges, particularly for higher power demand. Impacts will vary depending on your energy consumption and the rollout of half-hourly tariffs. Small businesses may see different impacts depending on their meter type and whether they are eligible for half-hourly metering.
Case studies
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