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Regulatory update: MHHS
The energy landscape is evolving, and at SmartestEnergy, we're committed to helping you navigate the upcoming Market-wide Half-Hourly Settlement (MHHS) changes with clarity and confidence.
Market-wide Half-Hourly Settlement (MHHS) is a significant regulatory change and transformation that promises a more accurate and efficient energy system, simplifying compliance and unlocking exciting opportunities for businesses like yours.
What is MHHS?
Mandated by Ofgem and delivered by Elexon, MHHS will require all customers’ electricity usage to be measured using half hourly data, driving more flexible, efficient and cost-effective electricity usage. The regulatory change is set to take effect on 2nd July 2027.
The rollout of MHHS is phased to ensure a smooth transition, so our customers can start seeing the benefits as early as possible.
Large businesses have long benefitted from half-hourly settlement, leveraging their precise electricity usage data to manage costs, measure efficiency and inform energy strategy. MHHS will also transition all non-half-hourly electricity meters to half-hourly settlement, giving every customer access to smarter demand management, accurate billing, and improved sustainability.
Your partner in the MHHS transition
We understand that navigating a regulatory change like MHHS can raise important questions. That’s why we’re actively working on developing clear guidance, ensuring you’re informed about the key milestones, timelines, requirements and how to make the most of MHHS.
We’re working diligently behind the scenes to ensure a seamless integration, making sure our systems and processes are fully compliant with the new settlement framework so you can navigate this change with confidence.
How does MHHS benefit your business?
Understanding the advantages of MHHS is key to preparing for this significant shift in the energy landscape. In moving towards a more granular, half-hourly settlement of electricity consumption, MHHS can unlock a range of benefits for businesses and the wider energy system.
Here are some of the key advantages all customers can expect:
- Enhanced Grid Efficiency: Providing better data for grid operators to manage supply and demand, facilitating the integration of renewable energy sources.
- Opportunities for Flexibility: Enabling businesses to actively participate in energy management and benefit from adjusting consumption patterns.
- Corporate Social Responsibility (CSR) Goals: Customers with CSR objectives can leverage MHHS to actively demonstrate and strengthen their environmental commitments.
Additionally, if you are currently operating on a non-half hourly contract you can expect:
- Greater Accuracy: Reflecting your actual energy usage more precisely, leading to bills based on actual consumption rather than estimates.
- Improved Forecasting: With access to granular data insights for enhanced energy management and forecasting.
We’ll get in touch with you directly to guide you through the upcoming changes.
What you need to know and do:
While SmartestEnergy manages the complexities of the settlement process, there are a few key areas for your business to consider:
- Consumption Patterns: If you are a half-hourly metered customer, we advise you become familiar with your energy usage to identify potential areas for optimisation and flexibility.
- Communication: Stay informed through our updates and engage with us to address any specific questions or concerns.
- Data Readiness: Understand your current metering infrastructure and ensure it's capable of providing half-hourly data. We can support you in assessing your readiness.
- Meter Readiness: To take full advantage of the benefits MHHS can provide to your company, and receive a highly detailed and dynamic picture of your energy use, we advise you update any non-half hourly meters to advanced meters, which can collect data on a half-hourly basis.
Looking ahead: embracing the future with MHHS
MHHS represents a significant step towards a smarter, more flexible, and sustainable energy system. As the transition progresses, businesses utilising their half-hourly data will be well-positioned to lead the way in innovation and cost optimisation.
At SmartestEnergy, we believe this evolution presents exciting opportunities for businesses to gain greater control over their energy, optimise costs, and contribute to a greener future. We’re committed to supporting you navigate what’s next, harness new opportunities, and stay ahead of the curve in an increasingly dynamic energy landscape.
FAQs
How can SmartestEnergy customers prepare for MHHS?
We would recommend that you stay informed of the changing electricity landscape to navigate MHHS planning and implementation.
Existing customers with working smart or advanced meters will have their systems automatically updated.
New customers without smart or advanced meters can get in touch with us directly by filling in our form here, but we will get in contact with existing customers where this is the case.
Whilst MHHS does not require energy meters to be upgraded to advanced meters that can collect data on a half-hourly basis, for many organisations, there are real benefits to doing so as they provide a highly detailed and dynamic picture of your energy use.
By upgrading your meters now, you’ll be able to get access to the benefits from MHHS sooner.
Why is smart metering so important?
Smart and Advanced meters are able to provide live insights by recording energy consumption every half-hour, helping to make the energy system more efficient.
The data-led insights they can provide facilitate innovation and flexibility, which help consumers reduce their energy costs.
What if I don’t have a smart or AMR meter?
This may affect your ability to take full advantage of the upcoming opportunities as a result of MHHS.
If you are an existing customer, our team will get in touch with you directly to arrange a site visit.
If you are a new customer, fill in our form here to see if you are eligible for a free meter exchange and to start the process of switching to a smart or advanced meter.
What qualification and migration wave are SmartestEnergy in for MHHS?
Wave 3: Which runs from Aug 2026 – May 2027.
What do you believe the impact will be of MHHS to customers?
Enhanced Energy Management
Having access to more granular energy consumption can help you optimise your operations and take advantage of more competitive tariffs.
You can also use this data to help you implement enhanced energy management strategies and reduce your carbon emissions.
Improved Billing Accuracy
For a large group of customers MHHS removes the reliance on estimated billing, meaning that you will be charged accurately, for your actual consumption. This greater degree of transparency can be leveraged in financial planning and billing dispute management.
Corporate Social Responsibility
MHHS supports sustainability objectives – it can be used by the CSR team to illustrate their commitment to sustainability. For instance, you could help reduce grid strain during peak usage periods and support a more resilient energy network.
Simplifying Compliance
By standardising half hourly settlements across the market, MHHS simplifies compliance with upcoming regulatory changes.
What are the key dates or milestones for customers to be aware of?
Milestone 1: M8/M10 Cutover
This is the ‘Go-Live’ Date for the industry for MHHS. Qualified suppliers can now begin migrating their customers to HH Settlements.
What is it?: On completion of initial industry testing, all Suppliers must align with the initial stages of MHHS. This requires changes to MPAN Topline data, review of communications with industry and ensuring changes do not disrupt servicing customers.
When does it take place?: September 22nd 2025
How does this affect SmartestEnergy Customers?: Customers will see an updated MPAN Topline on all bills and statements received after September 22nd 2025.
Milestone 2: Migration
What is it?: All meters, both HH and NHH, must move over to MHHS arrangements. Existing customers can be migrated via a logical change to the metering and where gaining new MPANs, these can be migrated on change of supply.
When does it take place?: From August 2026 to March 2027
How does this affect SmartestEnergy Customers?: SmartestEnergy Ltd will be able to begin migrations of its current and new customers to MHHS arrangements and settle them under MHHS half-hourly arrangements.
What does migration mean for customers?
The migration phase is where suppliers like SmartestEnergy can move their customers’ Meter Point Administration Number (MPANs) to the new settlement arrangements.
This means that all of our customers settlement arrangements will be migrated or changed, to being settled on a half-hourly basis.
I’m already Half-Hourly – what does this mean for me?
All SmartestEnergy customers will see an updated MPAN Topline on all bills and statements received after September 22nd 2025.
Current HH customers will still undergo migration - where suppliers like SmartestEnergy move their customers’ Meter Point Administration Number (MPANs) to the new settlement arrangements. Upon Migration MPANs will be appointed to the new MHHS Agent Services and allocated to the MHHS Customer Segments.
After July 2027, all Customers will be settled in a 4 month settlement timeline.
I’m a Generation customer – will I be impacted?
Generation Customers will see an updated MPAN Topline on all bills and statements received after September 22nd 2025.
Generation customers will still undergo migration - where suppliers like SmartestEnergy move their customers’ Meter Point Administration Number (MPANs) to the new settlement arrangements. Upon Migration MPANs will be appointed to the new MHHS Agent Services and allocated to the MHHS Customer Segments.
After July 2027, all Customers (including Generation) will be settled in a 4 month settlement timeline.
How does the new meter classification work and, where we currently have portfolios segmented by HH & NHH, will these still exist in MHHS?
Under MHHS Arrangements, customer portfolios will be segmented by meter type. The current meter classifications will be renamed into the three segments below:
- Advanced: For existing HH or AMR meters.
- Smart: For smart and non-half-hourly (NHH) meters.
- Unmetered (UMS): For all unmetered supplies.
Have any questions? Get in touch!
We're committed to making this transition as smooth as possible for our customers.
If you have any questions or concerns regarding MHHS and your electricity supply, SmartestEnergy has a dedicated inbox for MHHS related questions or enquiries. Please contact us below for any concerns or queries.