Market-wide Half-Hourly Settlement
The Ofgem programme to extend half-hourly settlement to all UK electricity customers, leveraging smart-meter data; phased delivery through the late 2020s.
Market-wide Half-Hourly Settlement (MHHS) is Ofgem's programme to move all UK electricity customers — domestic, microbusiness and non-domestic profile-class — onto half-hourly settlement, using data from the smart-meter rollout. Today, only customers with a measured maximum demand above 100 kW are settled on a half-hourly basis; everyone else is settled against a profile class.
The change is structurally significant for the supply industry but should be largely invisible to most customers. The intended outcomes:
- More accurate settlement, eliminating the systematic errors introduced by profile-class estimation.
- Stronger commercial signals for time-of-use tariffs, EV-overnight rates and demand-side response, because suppliers are settled against actual customer behaviour rather than a profile.
- Greater scope for innovative tariff design — particularly for households with EVs, heat pumps and home batteries.
Programme delivery is being phased through the late 2020s. Customers without a smart meter will continue to be settled on a profile-class basis; the change does not force a smart-meter installation but it does mean that the longer-term commercial benefits of smart-meter-enabled tariffs grow as the market completes the transition.
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Half-Hourly Metering
HHThe metering and settlement regime in which electricity consumption is measured and settled in 30-minute intervals; mandatory above 100 kW measured maximum demand.
Read definitionProfile Class
The classification of UK non-half-hourly electricity supplies by typical demand pattern; used to estimate consumption between meter reads.
Read definitionSmart Meter
A digital electricity or gas meter that records consumption in half-hourly intervals and communicates it to the supplier remotely.
Read definitionMeter Operator
MOPThe licensed entity that owns, installs and maintains a half-hourly electricity meter; contracted separately from the energy supplier.
Read definitionData Collector / Data Aggregator
DC / DAThe licensed entities responsible for collecting half-hourly meter readings (DC) and processing them for industry settlement (DA).
Read definition
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