Half-Hourly vs Non-Half-Hourly Meters Explained
“Half-hourly” is not a brand of smart meter—it is a legal settlement regime. If your MPAN’s measurement class says Half Hourly, your data collector logs 17,520 intervals a year, your DUoS statement shows red/amber/green time bands, and your invoice may list separate capacity charges priced in pence per day per kVA.
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Key takeaways
- Anything with Profile Class 00–04 (very large demand) is half-hourly by design; Class 05–08 can still be non-half-hourly unless remote telemetering triggered an upgrade.
- You pay for three parallel services on many HH sites: MOP (meter maintenance), DC (data collection) and DA (data aggregation)—each may appear as its own £/month line.
- Agreed capacity (sometimes “Authorised Supply Capacity” from the DNO) sets a floor for daily availability charges; exceed it and red-band DUoS multipliers punch harder.
- Non-half-hourly SMEs usually see one or two reads a year and a simple unit rate; that is cheaper administratively but hides peak spikes that HH settlement would have caught.
How to tell what you have in sixty seconds
Grab the top line of any invoice: the 21-digit MPAN contains a two-digit Profile Class after the first few blocks. Classes 05–08 cover most high-street and light-industrial premises. Flip to appendix A of the bill—if there is a matrix labelled “HH settlement” or a graph of 48 half-hour buckets, you are settled half hourly even if the front page still prints a single blended rate.
Still unsure? Call your Meter Operator (logo on the meter cabinet) or log into the retail portal: HH portals such as EDF’s PowerHub or Npower Business Solutions download CSV interval data; non-HH accounts rarely offer more than twelve monthly readings.
What actually hits the bill on a half-hourly circuit
Commodity is only the opening act. Distribution Use of System (DUoS) charges split by UK Power Networks or Northern Powergrid into time bands—late afternoon “red” slots on a winter weekday can cost multiples of overnight green slots. Transmission (TNUoS) and balancing (BSUoS) then layer on. That is why two sites on the same 27p “fixed” offer can differ by thousands: one shapes load away from tea-time, the other runs induction hobs flat out at 17:30.
Capacity priced at, say, £2.80/day per kVA on a 200 kVA agreed supply adds £700 a month before a single electron flows. If you know your peaks are fiction, start a formal kVA review with the DNO before renewal—savings routinely land five figures over a contract term.
Half-hourly vs non-half-hourly at a glance
| Topic | Half-hourly (HH) | Non-half-hourly (NHH) |
|---|---|---|
| Meter data | 48 half-hours/day logged remotely | Estimation or manual reads unless smart/AMR |
| Typical charges | DUoS time bands, kVA, HH admin fees | Simpler pass-through but less transparency on peaks |
| Who cares most | Factories, cold stores, EV hubs, any site >70 kW import | Shops, offices, pubs under HH thresholds |
| Flexibility | Can pair with batteries or load shifting | Harder to prove peak reduction to the DNO |
Upgrading or downgrading the metering regime
Supplier-led HH programmes piggyback on DNO cutouts and CT chamber swaps. Budget roughly £800–£2,500 for a formal recertification plus MOP appointment, though some bundles hide costs inside higher unit rates. If you have just breached 100 kW demand regularly, Ofgem’s market-wide half-hourly settlement programme may eventually force the migration anyway—getting ahead lets you choose the hardware vendor.
Read how to get a half-hourly meter installed for the procurement checklist, then study maximum demand charges so you negotiate kVA and HH tariffs in one conversation rather than bleeding margin twice.
Smarthub or legacy SCADA exports matter: even if you stay non-half-hourly, showing seasonal peaks to your account manager sometimes unlocks “pseudo-HH” monitoring tariffs where the supplier installs AMR at their cost because they want visibility before quoting flexibility products. That halfway house can be a cheap trial before you commit to full Market-wide Half-Hourly Settlement obligations.
What do you want to do next?
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