Your Market-wide Half Hourly Settlement (MHHS) Questions Answered

A: The Market-Wide Half-Hourly Settlement (MHHS) programme is an industry-led initiative designed to modernise how electricity usage is measured and settled across the market. By recording and settling energy use every half hour, MHHS will provide a more accurate and timely view of consumption.

A: Yes, Shell Energy is on the official path to MHHS qualification in line with Ofgem’s delivery plan.

A: We’re in Wave 3 and will migrate all portfolios between August 2026 and May 2027. Migrations will start small and grow steadily to minimise disruption.

A: MHHS readiness is a key priority. A multi-year project team, supported by senior leadership, is developing cross-departmental solutions and working closely with Ofgem, system providers, and industry stakeholders to meet all required standards and deadlines.

Shell Energy is part of Migration Wave 3, with portfolio migration expected to take place between August 2026 and May 2027. Migration will be carried out gradually to minimise disruption and keep customer portfolios together where possible.

A: Yes, our terms and conditions allow price or charge changes if required by regulation. We’ll always endeavour to keep any impact minimal.

A: Some current NHH meters may incur a capacity charge post-migration and we reserve the right to pass these on to customers.

A: SEUK intends to maintain pricing and contractual continuity for all live fixed-rate NHH contracts through MHHS migration. We will endeavour to honour the original contract prices; however, if new industry-wide regulated charges are introduced or the costs of supplying these NHH meters changes significantly due to MHHS migration, these may need to be passed through in line with our Terms & Conditions

A: Customers shouldn't notice much immediate impact from these changes. We'll keep you informed through regular updates on our website and blogs. If any changes are likely to affect you directly, we'll contact you in advance by email or through your account manager.

A: Our portfolio includes a mix of meter types, so upgrade needs will vary:

What action do customers need to take to ensure their transition goes smoothly?

Customers with a functioning smart or AMR meter are already set for the transition, and no action is required. However, customers with a non-functioning smart or AMR meter, or those using a traditional meter, may require a meter upgrade or an engineer visit to ensure a smooth transition.

If you are unsure about your meter type or its functionality, please contact our team who will be happy to support and advise on the next steps.

• Improved billing accuracy – Automatic meter readings reduce reliance on estimated consumption. • Fewer manual meter reads and site visits – Data is sent remotely, reducing the need for physical access while still supporting more frequent and reliable data across the industry. • Clearer visibility of energy consumption – More regular readings provide better insight into how sites use energy, helping to support monitoring, planning, and informed decision-making.

MHHS does not mandate replacing all traditional meters. However, upgrading to Smart or AMR meters provides benefits such as improved billing accuracy and reduced reliance on manual reads.

Customers with traditional meters may also experience potential impacts such as higher tender prices compared with smart/AMR portfolios.

If you would like to discuss upgrading your meters, please reach out to SEUKL-Smartmeter@shell.com.

Both provide automated data, but Smart meters support two-way communication and remote diagnostics, while AMR meters typically provide one-way communication and may require more manual intervention.

An AMR meter is typically more flexible for complex or remote sites, particularly where connectivity is limited whereas Smart meters rely on stable connectivity to enable full functionality.

Yes, traditional meters will continue to require physical reads via the Meter Reading Service (MRS). The shorter MHHS settlement timeline may increase the need for more regular meter reads.

To reduce site visits, Shell will continue to encourage customer self-reads.

Customers can submit their own readings at any time through the Shell Energy CSSP portal: https://auth.myaccount.uk.shellenergy.com/

A: Yes, customers with Smart or functioning AMR meters that can record and transmit 30-minute interval data will be available via the customer self-service portal once the account has been migrated.

A: Yes. These responsibilities will move to new market roles under MHHS, but you won’t need to take any action.

A: No. We’ll continue to follow strict GDPR and data privacy standards. Only authorised parties will have access to your data.