Public data register
Calculator assumptions
Ofgem Typical Domestic Consumption Values
The standard medium-household gas and electricity consumption figures used as calculator defaults.
Provenance
Provenance documented
- What it is
- The standard medium-household gas and electricity consumption figures used as calculator defaults.
- How it is produced
- Published third-party figure
- Coverage
- Great Britain
- Period
- Effective from 2026-07-01
- Last verified
- 11 August 2026
- Update cadence
- Reviewed when Ofgem republishes the values
- Where it lives
src/data/canonicalAssumptions.ts → TDCV and ASSUMPTION_RECORDS- Delivered by
- Held in the codebase registry
How the figure is produced
- Medium household: 2,500 kWh electricity, 9,500 kWh gas, and 3,400 kWh on a multi-register (two-rate) electricity meter.
- Every calculator that needs a default consumption figure imports these values, so a single change updates the whole site.
- Users can override the defaults with their own kWh figures wherever a calculator accepts them.
The data
| Assumption | Value | Unit | Effective from | Source | Verified on | User editable |
|---|---|---|---|---|---|---|
| Typical annual electricity consumption | 2500 | kWh/year | 2026-07-01 | Ofgem — Typical Domestic Consumption Values | 2026-08-11 | yes |
| Typical annual gas consumption | 9500 | kWh/year | 2026-07-01 | Ofgem — Typical Domestic Consumption Values | 2026-08-11 | yes |
| Typical annual multi-register electricity consumption | 3400 | kWh/year | 2026-07-01 | Ofgem — Typical Domestic Consumption Values | 2026-08-11 | yes |
- PowerGuardian public data register — Ofgem Typical Domestic Consumption Values
- Ofgem's headline cap figure has used these values (2500 kWh electricity and 9500 kWh gas) since 2026-07-01; before that it used 2700 kWh and 11500 kWh.
What this figure cannot tell you
- A 'typical' household is a statistical construct — most homes sit above or below it.
- The values do not adjust for property type, occupancy, insulation or heating system.
Where it is published
Related records
- Consumption basis behind the cap headline — The benchmark household consumption Ofgem uses to convert capped rates into the published headline figure.
- 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.
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