Half-Hourly Metered
HH
Billing ConceptsElectricity meters that record consumption every 30 minutes, providing actual usage data rather than estimated profiles.
Half-hourly (HH) metered supplies record exactly how much electricity is consumed in each 30-minute period. This is in contrast to non-half-hourly (NHH) meters which only record total consumption and rely on profile estimation.
Who has HH metering:
- All supplies over 100kW (mandatory)
- Profile Classes 05-08 and 00
- CT (Current Transformer) metered supplies
- Any supply with an advanced/smart meter collecting HH data
Why HH metering matters:
- Actual time-of-use data for Red/Amber/Green billing
- Subject to Capacity Market charges
- May face reactive power charges
- More accurate bills (no profile estimation)
- Required for certain industry charges
Post-MHHS: After Market-wide Half-Hourly Settlement, all smart meters will be settled on actual HH data, even if they're currently treated as NHH. This will make HH settlement the norm rather than the exception.
Related terms
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