The energy landscape is set to undergo significant change in 2025 with the rollout of Market-wide Half-Hourly Settlement (MHHS), a national initiative led by Ofgem. Linda Spencer, MD of Professional Energy People, explains how businesses can prepare now to maximise the benefits of this transformation.
What Is MHHS?
MHHS will impact all businesses on non-half-hourly (NHH) meters in the UK, changing how electricity usage is measured, settled, and billed. From October 2025, changes will roll out across the industry, with all relevant customers transitioned to MHHS over an 18-month period. While much of the transition will happen behind the scenes, businesses will notice changes in settlement, billing, and available services.
What Businesses Need to Know
1. Moving to Half-Hourly (HH) Settlement
All Meter Point Administration Numbers (MPANs) will transition to HH settlement, which provides a detailed, real-time picture of energy use.
For others, HH settlement means more accurate billing and potential updates to contracts and costs.
Businesses already using HH meters will see no changes.
2. New Industry Terminology and Market Segments
The MHHS program introduces new categories for MPANs: Smart, Advanced, or Unmetered.
Existing NHH processes will be replaced with updated services and data management tools.
Potential Benefits of MHHS
Ofgem estimates MHHS could deliver £1.5–4.5 billion in net benefits by 2045. For businesses, this presents opportunities to enhance efficiency and reduce costs.
Key Benefits Include:
Smarter Energy Insights: Access accurate HH data to better understand and manage energy usage, predict demand, and plan for future needs.
Cost-Saving Opportunities: Unlock new products and time-of-use tariffs, supporting the transition to Net Zero and reducing energy bills.
Simplified Processes: Avoid the hassle of manual meter data downloads by upgrading legacy meters to smart or advanced options.
Preparing for MHHS
To maximise MHHS benefits, businesses need smart meters capable of recording HH data, such as SMETS2, AMR, or HH meters.
2024 also marks the deadline for the Government’s smart meter mandate, which requires suppliers to upgrade non-smart meters. Having smart metering in place is critical for accessing future opportunities in areas like flexible tariffs, EV charging, and battery storage.
By preparing early, businesses can benefit from improved data, cost savings, and greater flexibility under MHHS.
We’re here to help
Your supplier will guide you through the mandatory transition to MHHS. Professional Energy People’s in-house experts are also here to support you with advice and services tailored to your business needs.
For energy procurement advice view our website or contact us today.
0330 0022180 | info@pepgb.com
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