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Starter guide to MHHS for businesses

Market-wide Half Hourly Settlement (MHHS) will affect us all.

Your energy data & metering are essential to achieving your Net Zero goals.

And it’s all about to change.

MHHS will see the biggest change to electricity data & metering in the UK and you will be affected.

Here’s our starter guide to Market-wide Half Hourly Settlement (MHHS) for businesses.

We’ve laid out the basics of settlement, the upcoming changes and what you need to ask your data & meter partners now so you can protect your energy data continuity beyond MHHS.

The what, why, when of MHHS

Right now, settlement is split by HH & NHH

The settlement process determines whether a supplier has purchased too much or too little electricity from a generator.

Then handles payments between them.

Currently, there are two types of settlement:

  • Non Half Hourly (NHH) which uses estimated profiles
  • Half Hourly (HH) which uses actual consumption data recorded by the meter

The performance standards and data timelines are much tighter in HH for data & meter providers, like us.

MHHS will move all supplies to the new HH settlement model

There are 30 million NHH sites and 300k HH sites in the UK.

The plan by Ofgem is to move those 30 million NHH meters to a new Half Hourly settlement model. On top of that, all unmetered supplies will also be included.

This programme is called Market-wide Half Hourly Settlement.

All the HH sites will also migrate to the new model as well.

It’s easily the biggest change in the UK’s electricity industry. 

Learn more: 7 MHHS changes you must know | Market-wide Half Hourly Settlement

April 2025 to October 2026 timetable

The migration of all meters to Half Hourly Settlement will start in April 2025 and is planned to be complete by October 2026.

This means you’ll start to see your meters migrate over to the new HH settlement operation model from April 2025.

We’re ready to take our customers through the migration, with all the new systems built in-house and tested by our data experts.

Find out more on this: Component Integration Testing

Timeline of Half Hourly settlement showing deadline for migration in October 2026

Instead of NHH and HH, it’ll be Advanced or Smart

The market will no longer be split by HH or NHH.

Instead, the meter type you have installed will become the most important factor.

And there’s new terminology that reflects this.

  • Advanced Data Services (ADS) or Smart Data Services (SDS) replace Data Collector or Retriever
  • Metering Services Advanced (MSA) and Metering Services Smart (MSS) replace Meter Operator (MOP)

Learn more: Glossary

Advanced meter

Data continuity as your data is collected directly from the meter by your chosen Data service (ADS)

Smart meter

Data collected by Data Communications Company then it’s
transferred to your chosen Data Service (SDS)

Ask the right questions now to take control

1. Understand your meters

  • Go beyond HH & NHH and ask about meter types
  • How many are Advanced, Smart (aka SMETS), Traditional or Unmetered?
  • Make sure they are all ready to go through MHHS migration.
  • Ask your data & metering provider(s) how they plan to migrate your meters. Will you need site visits? How will HH de-appointments be managed?
  • Ask what their capability is to handle your meter types during & after MHHS.

2. Plan your MHHS migration

  • Use a trusted partner. Don’t go it alone, lean on energy experts like Stark to keep you informed and in control.

3. Consider flexibility beyond MHHS

  • How can you be more flexible in your energy use after MHHS?
  • What Time of Use tariffs will be available to you?
  • What load can you shift away from peak times?
  • How will you monitor this?
  • What data analytics do you have to inform your decisions?
Check our energy data analytics platform Stark ID,  provided as standard with all our data services.

Data continuity is key – take control to protect your Net Zero goals.

In summary, whether you have all HH meters already, or a mix of NHH, HH and Traditional meters, everything will migrate to the new MHHS operating system from April 2025.

You’ll see more data, faster after MHHS, and have more opportunities for load shifting and even different, new tariffs.

Using a trusted data & metering partner to guide you is key. Don’t do this alone.

MHHS represents a huge change in the UK’s electricity industry  – so plan your journey, take control and enjoy data continuity with an independent data provider.

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