Market-Wide Half-Hourly Settlement Deployment Marks a Milestone for UK Electricity

Key takeaways

• The UK’s transition to Market-Wide Half-Hourly Settlement has reached an important milestone with the deployment of a settlement solution aligned to the 30-minute mandate now complete. 
• Through Systems Integration Testing and its role supporting the Advanced Data Service function, Itron has helped utilities prepare for the new market arrangements. 
• Early deployment experience is showing that settlement readiness depends on more than compliance. Utilities need reliable data exchange, automated validation, integrated workflows and the ability to manage increasingly complex meter portfolios. 
• As MHHS migration progresses, interval data quality, timing and cross-system coordination will become increasingly important to settlement performance. 

The UK's transition to Market-Wide Half-Hourly Settlement (MHHS) has reached an important milestone: a settlement solution aligned to the 30-minute mandate has now successfully been deployed. Under MHHS, electricity suppliers will settle energy usage using actual consumption data in 30-minute intervals rather than relying on estimates, helping create a more accurate, flexible and efficient electricity market. The reform is intended to support greater renewable energy integration, encourage demand flexibility and help deliver a smarter energy system. 

Itron helped customers gain early access to the new market arrangements through its involvement in the Systems Integration Testing (SIT) programme, the industry-wide testing phase used to validate that market participants and systems could operate successfully under the new MHHS framework. As the provider of the platform underpinning the Advanced Data Service (ADS) role, which manages and exchanges advanced meter data for settlement purposes, Itron is enabling the efficient management and exchange of settlement data, supporting faster settlement and a more connected, competitive energy market. 

Having successfully migrated advanced metering customers under MHHS, Itron is now focused on supporting the transition of more complex metering portfolios. Built on a proven, secure and scalable platform, Itron's ADS solution supports a wide range of meter types, including Code of Practice (CoP) meters, used at larger and more complex commercial and industrial sites, helping customers meet evolving market requirements with confidence.  

As utilities move from planning to implementation, early experience is beginning to reveal the systems, processes and data capabilities required to support settlement at 30-minute intervals. 

The Industry Impact of MHHS 

Beyond enabling half-hourly settlement, the MHHS data integration platform is helping create a more connected and competitive energy market. By supporting faster, standardized data exchange between market participants, it accelerates settlement and improves the accuracy of market processes. For an ADS provider like Itron, this streamlined data ecosystem enables the efficient validation, management and distribution of interval data, helping customers meet MHHS requirements while reducing operational complexity and improving settlement outcomes. 

While it may sound like a simple process update, the shift from estimated consumption to interval-based measurement raises the bar for visibility, coordination and data management across utility operations. These capabilities extend beyond what many legacy systems were designed to support and make it harder for utilities to rely on the workarounds that have historically kept settlement running. 

In many ways, MHHS is changing how settlement is viewed within utility operations. What has traditionally been a largely behind-the-scenes process is taking on a more prominent role as utilities work to manage larger volumes of data, tighter timelines and increasing market complexity. 

What MHHS Changes for Utilities 

Under legacy settlement models, much of the market relied on profile-based assumptions to estimate when and how energy was consumed. These models helped smooth variability across large customer groups, especially where interval data was limited. 

The UK mandate replaces those assumptions with actual consumption data recorded at 30-minute intervals, increasing precision and reducing tolerance for error. Settlement is no longer averaged across billing cycles. Instead, it is evaluated within each interval, making data quality and timing more visible across the market. As a result, utilities have less room for delays, inconsistencies and data quality issues that might have previously gone unnoticed. 

At its core, settlement remains the financial reconciliation of electricity supply and demand. What's changed is how that data is measured, validated and applied. 

As MHHS implementation progresses, utilities are gaining a clearer picture of the operational changes required. Utilities now need to manage larger amounts of data from multiple sources and at different frequencies, validate information more quickly and maintain consistency as data moves across systems and market processes. Amid a more distributed and dynamic grid, these requirements place increasing pressure on utilities to maintain data quality, resolve exceptions efficiently and keep processes aligned at scale. 

Settlement Is Taking on a More Strategic Role 

As the energy system becomes more dynamic and time-sensitive, the value of accurate and timely settlement is clear across utility operations. With more granular data, suppliers can better understand when energy is consumed in addition to how much. This supports more accurate forecasting and allows pricing to reflect actual usage patterns more closely. 

At the same time, the rise of distributed energy resources, electrification and changing demand patterns is adding more variability across the system. As that variability increases, accurate and timely settlement becomes even more important for maintaining balance, supporting billing processes and enabling new approaches to energy use. 

Regulatory pressure is also playing a role. As requirements for reporting become more granular, utilities are expected to deliver accurate data more quickly and maintain alignment across systems and market participants. 

What Early MHHS Deployments Are Revealing 

With MHHS deployments underway, utilities are moving beyond planning and preparation into operational execution. One of the clearest lessons emerging from these deployments is that systems need to work together more effectively than they have in the past. 

The transition to MHHS  affects far more than settlement itself. Data must move reliably from collection through validation and into market processes without introducing delays or inconsistencies. Utilities also need greater visibility into how data is collected, validated and used in settlement. Without that visibility, it’s increasingly difficult to maintain confidence in settlement outcomes. 

This is driving growing interest in more integrated approaches. Bringing together meter data collection, data management and market communications helps reduce reliance on manual processes and fragmented systems while supporting more consistent handling of interval data. 

As implementation progresses, utilities are placing greater emphasis on data quality, cross-functional process alignment and the ability to operate within tighter timelines. Capabilities such as automated validation, coordinated data flows and consistent reporting are increasingly critical as utilities look to support settlement at scale and meet evolving regulatory expectations. 

A Shift That Extends Beyond Compliance 

MHHS is fundamentally changing how utilities operate and how the market itself functions. Settlement now plays a more significant role in how energy is measured, valued and exchanged.

With the deployment of an MHHS settlement solution aligned to the UK's 30-minute mandate now complete, Itron is helping demonstrate what successful MHHS operations look like in practice. The milestone provides real-world insight into how utilities can manage interval data at scale, improve settlement accuracy and adapt to the evolving demands of a more dynamic electricity market.