Public data register
Calculator assumptions
Calculator fuel prices and heat pump efficiency
Default grid electricity and gas rates from the Ofgem cap in force today, plus illustrative oil, LPG and biomass prices and a typical heat pump performance factor.
Provenance
Provenance documented
- What it is
- Default grid electricity and gas rates from the Ofgem cap in force today, plus illustrative oil, LPG and biomass prices and a typical heat pump performance factor.
- How it is produced
- Maintained editorial figure
- Source
- Ofgem price cap (grid electricity and gas); PowerGuardian review (other fuels and model assumptions)
- Coverage
- United Kingdom
- Period
- Reviewed 2026-06-01
- Last verified
- 1 June 2026
- Update cadence
- Monthly
- Where it lives
src/data/toolAssumptions.ts → FUEL_PRICES_PENCE and HEAT_PUMP_SPF- Delivered by
- Held in the codebase registry
How the figure is produced
- Grid electricity and gas defaults are read from the confirmed Ofgem cap period in force today and labelled with that period and its checked date.
- If that record cannot be read, tools keep an older illustrative figure and say so rather than calling it current.
- Oil, LPG and biomass prices and the heat pump factor are PowerGuardian illustrative figures with their own review date. Every value is user-editable.
The data
| Assumption | Value | Unit | Basis |
|---|---|---|---|
| Default grid electricity unit rate | 26.32 | p/kWh | Ofgem price cap, 1 Oct 2026 to 31 Dec 2026, Average across England, Scotland and Wales, Direct Debit, single-rate meter; checked 9 Nov 2026 |
| Default mains gas unit rate | 7.97 | p/kWh | Ofgem price cap, 1 Oct 2026 to 31 Dec 2026, Average across England, Scotland and Wales, Direct Debit, single-rate meter; checked 9 Nov 2026 |
| Illustrative oil price | 7.5 | p/kWh | PowerGuardian illustrative figure, reviewed 2026-06-01; not price-capped |
| Illustrative lpg price | 10 | p/kWh | PowerGuardian illustrative figure, reviewed 2026-06-01; not price-capped |
| Illustrative biomass price | 6 | p/kWh | PowerGuardian illustrative figure, reviewed 2026-06-01; not price-capped |
| Typical heat pump seasonal performance factor | 3 | ratio | Model assumption, reviewed 2026-06-01 |
- PowerGuardian public data register — calculator fuel prices
- Grid electricity and gas defaults follow the Ofgem cap period in force today and carry their own checked date.
- Model assumptions last reviewed: 2026-06-01. Every value is user-editable in the tools.
What this figure cannot tell you
- The cap is a Great Britain average for Direct Debit single-rate meters; your own tariff and region may differ.
- Oil, LPG and biomass prices are not regulated and vary widely by supplier, region and delivery volume.
Where it is published
Related records
- Ofgem Typical Domestic Consumption Values — The standard medium-household gas and electricity consumption figures used as calculator defaults.
- Calculator model assumptions — The physical and financial modelling constants behind the solar, battery, EV, heat pump and boiler calculators.
Think this figure is wrong? Tell us and we will check it against the source. Corrections are logged publicly.
Report this figureCorrections log