Market-wide Half-Hourly Settlement (MHHS)

MHHS (Market-wide Half-Hourly Settlement) means all electricity energy suppliers will collect your electricity usage data every 30 minutes, instead of monthly or whenever you submit a reading. 

With this data, we can better understand your usage and predict your energy needs more accurately. This means we can buy the right amount to make sure we’re meeting demand, rather than trying to estimate based on your average usage. 

All energy suppliers must move to MHHS by May 2027. 

Moving to half-hourly data collection brings some important benefits – not just for energy suppliers, but for you and the planet too: 

• Smarter predictions, less waste  

By seeing your usage patterns more clearly, we can buy the right amount of energy to meet your needs – reducing waste and helping to keep costs down. 

• Tailored products and services 

With a clearer picture of how you use energy, we can create smarter, more personalised tariffs to suit your needs. For example, you’ll be able to choose between a single-rate tariff, or a tariff with separate day and night rates. 

• Help you make greener choices 

Understanding when you use energy allows us to offer tools and advice that help you use less when demand (and cost) is highest – supporting your sustainability goals. 

• Supports a more reliable energy grid  

With better forecasting across the industry, MHHS helps reduce pressure on the National Grid – helping to prevent outages and make the system more resilient for everyone. 

No, there won’t be any changes to the way our energy contracts work because of MHHS. 

If MHHS migration is delayed, customers should continue to receive their energy supply as normal.  

However, we won’t be able to take on new supply points until the process is complete. 

All business energy customers, including low-consumption customers and landlords, should see little to no disruption to their energy supply as the switch to MHHS takes place. 

We’ll communicate any changes that affect you in advance. 

Changes to the use of sharing data for settlement purposes only impacts customers who have a smart meter and an electricity supply.

Yes, we will update your Terms & Conditions to reflect this change.

Yes, all data collected, stored and processed will be safe and in full compliance of GDPR.

The switch to half-hourly settlement won’t change the way we work out our energy prices – they’ll continue to go up and down in line with the market. 

However, having more accurate energy usage data will help us buy the right amount of energy, and provide smarter, more personalised services to our business customers.  

We’ll continue to review our standing charges as usual once MHHS is in place. This means we’ll consider a range of factors, including market prices and our own operating costs. 

If you’re an export customer generating renewable energy (such as solar power), you’ll automatically be opted-in to send half-hourly readings from your export meter.   

This is because your payments are based on the energy you generate, which is measured every 30 minutes.  Therefore, you won’t be able to opt-out.  Please note this doesn’t affect your choices for your electricity import meter. 

If your meter doesn’t already send us half-hourly data, it will be affected by MHHS.  

Most electricity meters are compatible with half-hourly settlement, and we’ll switch them over remotely whenever we can. If your meter isn’t compatible, we’ll need to arrange a meter exchange. 

If you’re unsure whether your meter is compatible with MHHS, you can find out by contacting us. 

We plan to migrate all meters to half-hourly settlement. Exactly how this works will depend on your meter type. 

We’ll communicate how you’ll be affected in advance. 

If you’re unsure whether your meter is already providing half-hourly readings, you can find out by contacting us. 

Yes. Customers with Advanced (AMR) meters are included in MHHS and will benefit from improved accuracy and settlement visibility.

No, all changes will be made remotely.

A Meter Operator (MOP) agreement is a contract between a business and its meter operator. The meter operator agrees to maintain and repair your meter, and provides consumption data to your energy supplier. Having a MOP in place is compulsory for all half-hourly meters.  

Normally, we arrange a MOP on our customers’ behalf, so there’s no need to worry about it – but you can choose your own MOP if you like.  

If we’ve arranged a MOP on your behalf, there’s nothing you need to do. 

However, if you’ve arranged your own MOP, MHHS changes might affect you. If your MOP doesn’t isn’t MHHS qualified by May 2026, we might need to speak with you or appoint a new provider on your behalf. 

Yes – the broker portal is being updated to support MHHS requirements.

However, quotes for half-hourly and migrated meters aren’t currently available through the portal, and may need to be managed through alternative processes. 

The customer journey from getting a quote, to receiving energy, to being billed won’t change. However, customers will have increased visibility over their energy use.