- PC 01–04 sites are priced on estimated national profiles
- PC 05–08 and 100+ kW sites use half-hourly (HH) metering
- P272 made HH settlement mandatory for all PC 05–08 sites
- Shifting peak consumption is the fastest way to reduce HH bills
What are profile classes 1–4?
Smaller sites sit on profile classes 1–4. Suppliers estimate your consumption shape using a national profile, then reconcile against your quarterly reads. It's simple, but it can mask peaks and off-peak troughs.
What are profile classes 5–8 and half-hourly (HH) metering?
Larger sites (or anyone above 100 kW peak) sit on HH — half-hourly — metering. Every 30 minutes of consumption is recorded and settled individually, giving suppliers a precise picture and often a tighter price.
What did the P272 reform change?
The P272 reform moved every profile class 5–8 site onto mandatory HH settlement. If you were on PC 05–08 before 2017, you are now HH-metered and priced on actual shape data.
How do you get the most from half-hourly data?
Ask your supplier or broker for your HH data as a CSV. Peak-hour consumption above 4pm–7pm is the most expensive to serve — shifting even 10% of it can move your bill materially.
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