MHHS: Market-Wide Half-Hourly Settlements

6 October 2025

Market-Wide Half-Hourly Settlement (MHHS)

What is MHHS?
MHHS stands for Market-Wide Half-Hourly Settlement. Currently, most electricity is billed based on estimates or meter reads that can be provided monthly, quarterly, or sporadically. With MHHS, electricity consumption will be accounted for and billed in 30-minute blocks.

The idea is that with more precise, time-based data, suppliers and networks can match supply and demand more accurately. This helps reduce waste and allow more flexibility in how electricity is used across the system.


Who does it apply to?
Previously, only large industrial and commercial users needed to have half-hourly meters, but MHHS is intended to apply across the whole electricity market in Great Britain. This includes domestic consumers, small businesses, large industrial users, and everything in between.

That means most electricity users will be indirectly affected, even if they don’t see anything change in how their meter looks, the rules behind billing and settlement will shift behind the scenes.

What are the major changes?

Here are the biggest differences MHHS will bring:

  • More accuracy in billing and settlement
    Instead of relying on broad estimates or usage profiles, settlements will use actual (or as close as possible) half-hourly data, making bills closer to real usage.
  • Shorter settlement cycles
    Currently, settlement (reconciling who generated, who consumed, who oversupplied or undersupplied) can take many months and reconciliation takes place every 12 months. Under MHHS, the aim is to reduce that to about four months.
  • New market segments and roles
    The old division between half-hourly (HH) and non-half-hourly (NHH) settlement types will be replaced by new classifications like “Smart,” “Advanced,” and “Unmetered.” Existing agents and roles (like data agents, meter operators) will be reorganised or renamed into “Data Services” and “Metering Services.”
  • Greater flexibility and smarter tariffs
    With more precise data, suppliers can offer new tariffs that are  able to be more focused on when energy is used, or incentive schemes where customers shift usage to cheaper off-peak periods.  

 

While many of these changes will be invisible to consumers day-to-day, the underlying systems and billing logic will be overhauled.


When will it happen?
MHHS has already been in planning for several years. In April 2021, Ofgem confirmed its decision to implement MHHS with Elexon appointed as Senior Responsible Owner.

On 22 September 2025, the MHHS system infrastructure officially went live. Following that, from late 2025 onward, MPANs (meter points) will begin migrating to the new system over an estimated 18 months.

By July 2027, the industry aims to run settlement cycles in a four-month window across all participants. This will increase the accuracy with which many Non-commodity charges are applied and decrease the need for major reconciliations.


If your business requires more information about MHHS or advice with its energy procurement, management, or planning, then don’t hesitate to contact Seemore Energy. Our experienced advisors can help you with bespoke strategies and advice that is tailored to your needs.



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24 February 2026
Where Does My Energy Come From? It’s a simple question, but the answer is more complex than many businesses realise. When you flick a switch or power up your operations, the electricity and gas you use is the end product of a vast, interconnected system of generation, infrastructure, global markets and regulation. Understanding where your energy comes from isn’t just a curiosity, it’s commercially relevant. Electricity: A Real-Time Balancing Act In the UK, electricity is generated from a mix of sources. The primary contributors today include: Gas-fired power stations Wind (onshore and offshore) Nuclear Solar Interconnectors importing power from Europe Unlike gas, electricity must be generated and consumed in real time. Supply and demand are constantly balanced by the system operator, ensuring the grid remains stable. If supply ever falls short, then prices can spike. In recent years, numerous grid updates have taken place to ensure that renewable energy can be added to the grid and quickly transported. While many businesses purchase “renewable” tariffs, this doesn’t mean the electricity you receive was generated by renewable sources. Electricity on the grid is pooled, so you don’t receive electrons directly from a specific wind farm. Instead, suppliers match your usage with renewable generation certificates (REGOs), demonstrating that an equivalent amount of green power has been produced. For larger energy users, the mix of generation matters because it directly impacts wholesale pricing. An evening with low wind output, for example, can significantly increase reliance on gas-fired generation, therefore increasing exposure to the wholesale price of gas. Gas: A Global Commodity Gas plays two roles in the UK energy system: Heating homes and businesses directly, and fuelling many power stations that generate electricity. The UK produces some natural gas domestically from the North Sea, but production has declined over the years. Today, a significant proportion of supply is imported via: Pipelines from Norway Liquefied Natural Gas (LNG) shipments – particularly from Qatar and the US Interconnectors from continental Europe Because gas is traded globally, UK prices are influenced by international supply and demand dynamics. Events in Europe, Asia or the US can directly affect what UK businesses pay. This means geopolitical events such as the threat of war in the Middle East can cause prices to rise sharply . Renewables and the Energy Transition The UK’s generation mix has changed dramatically over the past decade. Coal has been phased out, while wind and solar capacity have grown significantly. This shift brings both opportunity and volatility. Renewable generation lowers carbon intensity and reduces exposure to fuel imports. However, because wind and solar output depend on weather conditions, short-term price fluctuations have become more pronounced. For businesses with flexible procurement strategies , understanding this dynamic can create opportunities to secure more competitive pricing. Why It Matters for Your Procurement Strategy Where your energy comes from can influence many other aspects of your energy strategy, including: Wholesale market pricing Carbon reporting obligations Contract structures Long-term risk exposure Understanding where your energy comes from has never been more important for UK businesses. If you want to understand how the current generation mix and global gas markets are affecting your upcoming renewals, SeeMore Energy can help you interpret the landscape and see what options are currently available for you.
23 February 2026
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18 February 2026
The Capacity Market: An untapped revenue source With wholesale markets volatile and network costs rising, many businesses are looking at strategies to reduce energy spend. In addition to lowering costs, there are ways that large consumers of energy can monetise their existing energy set up. By selling back unused capacity via the Capacity Market (CM), businesses can generate tens of thousands of pounds each year, without having to make any material changes to how they run their operations. What is the Capacity Market? The UK Capacity Market was introduced in 2014 to safeguard security of supply. The CM has two main objectives: Incentivise new sources of generation that can prevent issues on the demand-side. Provide a last-resort mechanism to prevent electricity shortages during times of system stress. Administered by National Energy System Operator (NESO), the scheme pays providers for being available to deliver capacity during periods of system tightness. Businesses can receive payments, not for generating electricity, but for committing to reduce demand or increase supply if required. Capacity is secured through annual auctions (one year ahead and four years ahead), which set a £/kW price. Once contracted, participants receive an availability payment in return for meeting testing requirements and being ready to respond to a system stress event. Since the CM’s inception, there has never been a full system stress event triggered. Although precautionary notices have been issued and subsequently stood down – normally within 2 hours of being issued. How Can Businesses Make Money from It? For many businesses, the opportunity lies in Demand Side Response (DSR) . If a business can demonstrate that it is capable of reducing load during a stress event -- even for just 30 minutes -- that reduction can be contracted into the Capacity Market. The process for this is: Historical half-hourly data is analysed to establish normal usage. Periods where usage dropped materially (e.g. shutdowns, maintenance, early finishes, seasonal dips) are identified. The difference between normal usage and the reduced period becomes the site’s deliverable capacity. This capacity is aggregated with other businesses into a CM Unit (CMU) and entered into the auction. Payments are then made quarterly in arrears for being available.
12 February 2026
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5 February 2026
Why it’s important your energy bills are in the correct company name For many businesses, energy bills aren’t reviewed with a high-level of scrutiny. As long as the meter is live and the lights stay on, the paperwork often goes unquestioned. However, having electricity and gas bills issued in the correct legal company name is more important than many organisations realise. Failing to ensure that your invoice is correctly addressed can create unnecessary risk and cost. How it can impact your business Energy contracts are signed with a specific legal entity, not a trading name or group brand. If the company name on the bill does not match the Companies House records, the contract may not accurately reflect who is legally responsible for the supply. This can cause problems in the event of disputes with the supplier, changes of tenancy or site ownership, and contract renewal or termination. In some extreme cases, suppliers can refuse to amend or even enforce contracts where the named party is incorrect. Affecting credit checks and pricing Suppliers assess risk using the company name registered on the account. If this is incorrect or outdated: Credit checks may fail or be delayed Higher security deposits may be requested Less competitive pricing may be offered For growing businesses, group structures or recently incorporated entities, this can result in paying more than necessary for energy, simply because the account information isn’t aligned. Delaying contract changes and site updates Something as simple as renewing a contract, adding meters, or updating a supply address can become complicated if the company name is wrong. Common scenarios include: Sites transferred between group companies Trading names used instead of legal names Businesses that have changed structure or ownership Each of these can trigger lengthy data disputes between suppliers, distributors and settlement systems, often delaying changes by weeks or months. Issues with VAT, levies, and exemptions Where VAT exemptions exist, the name on the invoice is required to match the name of the business that has the exemption. There are numerous government schemes that offer businesses relief from specific environmental levies and non-commodity charges . Many of these schemes – such as the British Industry Supercharger – are applied to companies with eligible SIC codes. If the business name is incorrect, then the SIC code cannot be verified and the business may end up missing out on the exemption. Future Contracts When tendering energy contracts, suppliers rely on accurate account data. Incorrect company names can slow down the quoting process, result in quotes being withdrawn, or lead to errors in contracts or start dates. For businesses managing multiple sites, this becomes even more critical. How we help businesses get it right As an energy broker, we regularly see cost and risk created by something as simple as incorrect account information. We help businesses:  Verify company names against Companies House Correct supplier and industry records Manage name changes during restructures or acquisitions If your business requires help with ensuring that your invoices are being issued in the correct name, contact us today and one of our experienced team can assist with all of your energy needs.
5 February 2026
Rising TNUoS and DUOS charges By Adam Novakovic T.S Eliot once said that “April is the cruellest month” and in terms of the prices many businesses pay for their electricity, his quote is prophetically true. While he may not have envisioned rising TNUoS and DUoS costs being the reason for the starkness of the month, for many British businesses, the rise in non-commodity charges that take effect from April 1 st will add unwanted and unneeded extra costs to their energy bills. From the beginning of April, businesses across the UK will see significant increases in two major components of their energy bills: Distribution Use of System (DUoS) and Transmission Network Use of System (TNUoS) charges. These network charges are becoming an increasingly large part of business energy bills -- especially for companies that operate in energy-intensive industries. DUoS & TNUoS, and Why They Matter Both DUoS and TNUoS are network charges applied to electricity bills. As non-commodity charges, they are not related to the cost of energy itself: DUoS charges cover the cost of running, maintaining and reinforcing local distribution networks that carry power to sites. They are paid as a standing charge (in p/day), a capacity charge (in p/kVA/month), and in red/amber/green unit rates – depending on the time of consumption. TNUoS charges fund the high-voltage transmission network operated nationally. This is applied as a standing charge (in p/day). For many businesses, these line items are already making up over a third of their total electricity costs . How these charges change from April 1 st 2026 TNUoS The TNUoS rate that businesses pay is set by NESO (National Energy System Operator). How much a meter is charged per day is dependant on the assigned TCR band . For sites with lower expected consumption, they will be grouped in a lower band, whereas the largest consumers will be in the higher bands and they will be charged more.
1 February 2026
By Adam Novakovic January began with a sense of optimism. The new year brought hopes that energy prices could soon return to levels not seen since 2021, wholesale prices were falling and large quantities of new LNG were scheduled to be available for import during 2026. However, events that transpired during the first 31 days of the year have caused prices to rise and have sent waves of fear throughout the energy markets. The month began with a wave of cold weather leading to above-expected gas consumption. An Arctic blast combined with Storm Goretti brought temperatures down to below -10°C and led to gas power stations being needed to make up the shortfall, causing an uptick in wholesale gas prices.
30 January 2026
What is the Weighted Average Price (WAP) in energy? In the UK energy market, Weighted Average Price (WAP) refers to the average price paid for electricity or gas over a period of time, weighted by the volume bought at each price point. For those on flexible energy contract, the WAP represents what the unit rate will be when multiple purchases were made for the same period. In other words, it answers the question: “What did we actually pay for our energy once all purchases and volumes are taken into account?” This makes WAP far more meaningful than a simple average, especially in volatile markets. How WAP works in practice Energy prices move constantly. Businesses, particularly those on: Flexible contracts Basket or portfolio products Pass-through arrangements often buy energy in multiple tranches at different times and prices. For example: 40% of energy bought at 10.0p/kWh 30% bought at 12.0p/kWh 30% bought at 9.0p/kWh The WAP reflects the price-weighted impact of each purchase, giving a single unit rate that reflectsthe real cost exposure. Why WAP matters to UK businesses 1. It reflects real procurement performance WAP shows how effective your buying strategy has been, not just whether the market went up or down, but how your timing and volumes performed. 2. It’s essential for budgeting and forecasting Using WAP allows businesses to: Accurately forecast energy spend Compare performance year-on-year Avoid misleading headline prices This is especially important for manufacturers and high-consumption sites where small price differences materially impact costs. WAP vs fixed prices Fixed contracts : WAP is locked in at the point of contract Flexible contracts : WAP evolves over time as more volume is bought This means WAP can improve with smart market timing and deteriorate if exposure is unmanaged. For those on fixed contracts, it can be vital that portfolios are being managed by a person or group with experience and expertise in energy markets. Ultimately, the strategy of when and how much to buy is just as important as the market itself. WAP as part of your purchasing strategy Weighted Average Price is the truest reflection of what your business actually pays for energy. Understanding it is critical to controlling cost risk in volatile markets. For larger SMEs and energy-intensive businesses, having a clear energy purchase strategy and having this strategy communicated through regular reporting can be vital for forecasting future energy costs. If your business would like assistance with understanding the current state of your portfolio, or advice on purchasing and management strategies, contact us today to see how we can help lower your electricity and gas costs and help you See More of the hidden value in your energy portfolio.
29 January 2026
Meter types explained (LV, HV and EHV) For many businesses, electricity is treated as a fixed overhead -- something that cannot be changed. But in reality, how your site is connected to the electricity network can significantly influence what you pay , and many organisations are unknowingly on a setup that no longer suits their operations. Whether your supply is Low Voltage (LV), High Voltage (HV) or Extra High Voltage (EHV) impacts network charges, flexibility, and future growth. Understanding the difference could be the key to reducing costs and avoiding any unpleasant surprises. Low Voltage (LV): common, simple — and often overlooked Low Voltage (LV) supplies electricity at up to 1,000 volts and is the most common connection type for SMEs, offices, and retail units. LV customers usually benefit from: Straightforward billing Lower DUOS standing charges Minimal technical involvement However, simplicity can mask inefficiency. As businesses grow, extend operating hours or add energy-intensive equipment, LV sites can find themselves paying disproportionately higher network charges as red and amber unit charges make up a higher percentage of the costs. If your electricity costs have risen faster than your usage, your meter type could be part of the reason. High Voltage (HV): complexity that creates opportunity High Voltage (HV) connections operate between 1,000 and 22,000 volts and are typically used by manufacturers, large warehouses and energy-intensive commercial sites. HV supplies bring: Higher capacity charges Greater exposure to kVA related costs More detailed half-hourly consumption data While this can appear daunting, it also creates opportunity. Businesses that understand how and when they use electricity can actively influence costs, often achieving savings that are simply unavailable at LV. Many HV customers pay for more capacity than they need --or the wrong capacity altogether -- without realising it. Contact us today and we can conduct a kVA review that could potentially save £10,000s annually. Extra High Voltage (EHV): where energy becomes strategic Extra High Voltage (EHV) applies to supplies above 22,000 volts and is reserved for the UK’s largest electricity users. At EHV level: Network charges are highly bespoke Costs are closely linked to site-specific infrastructure Small demand changes can have large financial impacts For these businesses, electricity is not just a utility, it’s a strategic cost driver that requires ongoing oversight. Without regular review and proactive management, EHV sites can sleepwalk into avoidable six-figure cost increases. Why understanding meter type matters Meter type determines: How DUoS and other network charges are applied How much control you have over peak costs Whether your connection aligns with how your site actually operates today Many businesses inherit their meter type and never question it, even when their operations change dramatically. These changes in how a meter operates can require reviews of kVA capacities, meter type, and TCR bands . All of which can help towards reducing energy spend. How we help businesses take control As an energy broker, our role goes far beyond securing competitive unit rates. We help businesses: Understand whether their current meter type still fits Identify inefficiencies hidden within network charges Plan energy strategies that support growth, not restrict it If you’d like to understand whether your LV, HV or EHV supply is working for your business, or quietly working against it, a no-obligation review could uncover meaningful savings and future-proof your energy strategy.
28 January 2026
What are Balancing Services Use of System (BSUoS) charges? Balancing Services Use of System ( BSUoS ) charges recover the cost of keeping the electricity system in balance in real time. Electricity must be generated and consumed at the same moment, and BSUoS funds the actions National Grid Electricity System Operator (NESO) takes to achieve this. These actions include: Instructing generators to increase or decrease output Paying for reserve and response services Managing system constraints and frequency control BSUoS is therefore not about building networks (like TNUoS or DUoS ), but about operating the system safely and securely second-by-second. Who pays BSUoS charges? Since April 2023, BSUoS costs have been recovered entirely from electricity demand rather than split between generators and suppliers. In practice: Suppliers pay BSUoS charges to the system operator These costs are then passed through to all electricity consumers, including business customers Most businesses see BSUoS as a pass-through charge in their supply contracts Domestic customers also contribute, although the charge is typically embedded rather than itemised. How do BSUoS charges work in practice? BSUoS is charged on a per kWh basis, based on actual electricity consumption during each settlement period. The BSUoS rate reflects the real-time cost of balancing the system, which can vary significantly depending on: Weather conditions Generator availability Network constraints Levels of intermittent renewable generation Unlike DUoS or TNUoS, BSUoS is not location-specific. The same rate applies across Great Britain for each settlement period. How much is BSUoS (and when are charges set)? BSUoS charges are not fixed in advance. Instead, they are calculated using a forecast-and-reconciliation model. This means the amount originally charged can be reconciled after the fact once actual consumption data is available. In p/kWh terms, BSUoS charges have varied widely in recent years, but for business customers they have typically fallen in the range of 0.6–1.6 p/kWh, with occasional spikes during periods of market volatility. Because of this variability, BSUoS can be a driver of bill uncertainty for large and flexible users. Why BSUoS matters for businesses As the electricity system becomes more reliant on intermittent renewables, balancing actions are expected to increase. This means BSUoS is likely to remain a material and structurally important cost. For sites with half-hourly metering, reducing consumption during system stress periods -- or using on-site generation and storage -- can help limit exposure, although BSUoS is generally less controllable than DUoS or TNUoS. If you would like to ensure that your BSUoS charges are being invoiced correctly. Contact us today and we can review your recent invoices to make sure you aren't paying more than necessary.