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MHHS guide · reviewed 16 September 2026

Market-wide Half-Hourly Settlement: what businesses should check

MHHS is changing electricity settlement arrangements. For a business buyer, the useful questions concern data, meter migration and future tariff design.

Last reviewed 18 September 2026

Key answer

MHHS does not automatically guarantee a cheaper tariff

The programme increases the use of half-hourly consumption data in settlement. Businesses should confirm how their supply is being migrated, how they can access usable consumption data and how a proposed tariff treats different time periods.

Retail manager discussing electricity use on a shop floor, relevant to market-wide half-hourly settlement: what businesses should check
Opening hours and operating equipment shape commercial electricity demand.

Current programme milestones

Elexon lists 28 October 2026 as the point at which all suppliers can access MPANs under the new arrangements, 7 May 2027 for migration completion and 2 July 2027 for settlement timetable cutover. These are programme milestones, not a statement that every business has already migrated.

A supplier can explain the status of an individual supply. Avoid assuming that MHHS forces every business onto a time-of-use retail tariff.

  • Ask which meter and settlement arrangement applies now.
  • Request accessible consumption data where available.
  • Check whether operating hours align with tariff periods.
  • Model rate differences using actual intervals before changing behaviour.
Warehouse team checking electrical equipment and site power needs, relevant to market-wide half-hourly settlement: what businesses should check
Real operating conditions provide context for business electricity decisions.

Use data for a procurement decision

Half-hourly data can reveal when consumption occurs, not just how much is used in a year. A business can use that information to test time-based offers, investigate peaks and explain operating patterns to prospective suppliers.

Office manager reviewing building electricity use with a specialist, relevant to market-wide half-hourly settlement: what businesses should check
A practical review connects bills and contracts to how a workplace actually operates.

Sources

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