Change and Transformation in the Private Sector
MHHS is one of the largest and most complex changes to the UK energy market, overhauling electricity settlement, underpinning net zero and unlocking up to £4.5bn in industry benefits by 2040.
The Marketwide Half Hourly Settlement Programme (MHHSP) is an industry-wide transformation programme in the energy sector designed to overhaul the electricity settlement process across the UK.
This programme touches every element of the industry, requiring significant people, process and technology change across 150+ organisations. MHHSP is a key enabler to achieving net zero, it will help unlock the level of flexibility in the energy system needed to maximise benefits of distributed generation such as EV charging, battery storage, solar and wind. It will provide a volume of data and insight that will enable organisations across the industry to leverage existing asset efficiency, reduce risk exposure (and subsequent consumer costs) and offer innovative new ‘time of use’ tariffs.
By moving to an operating model where settlement is based on actual consumption data (rather than estimated profile classes), MHHSP will enable consumers to shift usage to off-peak times and see that reflected in their bill. This change in consumer behaviour and ‘load shifting’ within the electricity system will help reduce demand on the grid at peak times, delivering significant cost savings to industry. In their business case, Ofgem estimate the monetary benefits case for MHHSP to be between £1.6bn and £4.5bn between now and 2040 – demonstrating the scale of opportunity.
MHHS is widely regarded as the most complex industry change since the privatisation of energy, and Moorhouse (along with parent company Expleo) have been at the forefront of delivery since 2021.
Elexon, Regulatory Code Manager for the Balancing and Settlement Code (BSC), were appointed SRO for MHHSP by Ofgem. They ran a highly competitive tender to appoint a Lead Delivery Partner (LDP) and in late 2021, Moorhouse and Expleo won the contract and mobilised as the LDP. We set up core delivery workstreams across Programme Management Office (PMO), Programme Party Coordination (PPC) and Systems Integration (SI) as well as forming a core programme leadership team responsible for delivering this multi-year industry-wide Programme from mobilisation to go live.
In September 2025, the central systems and processes that make up the new MHHS Target Operating Model went live. This was a significant milestone and the culmination of over 4 years of cross industry collaboration – a process that has involved every individual organisation in the sector. In October 2025, the Migration window was approved to open – this signified the start of an operationally intensive 18-month process to migrate all 30-million electricity meters across England, Scotland and Wales to the new Half-Hourly Settlement arrangements, while in ensuring that there are no operational implications on the BAU settlement process.
As the LDP, Moorhouse have spearheaded the Programme in partnership with Elexon, as SRO, from mobilisation through design, build, industry testing into Go Live and Migration. It has been at the centre of this complex industry change for over 4 years, setting the strategic direction and developing and managing a complex implementation plan from inception to go live, leveraging its deep expertise across programme delivery, business change, strategy and technology delivery.
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