Transparency
Public data register
Every principal figure on this site is listed here with its source, the period it covers, how it is produced, when it was last verified and what it cannot tell you. Where a figure is our own calculation we say so. Where provenance is incomplete we say that too, rather than removing the record.
Records with incomplete provenance
These datasets are published without a fully documented source or verification date. They are shown as indicative comparisons only, no downloadable table is offered, and they should not be cited.
Market figures
The published price-cap figures and rates PowerGuardian quotes across the site.
Current Ofgem energy price cap
The headline annual figure and capped unit rates and standing charges for a typical Direct Debit household.
Period: The cap period currently in force · Updated: Each Ofgem cap period, on the day the period begins
Inspect this recordConsumption basis behind the cap headline
The benchmark household consumption Ofgem uses to convert capped rates into the published headline figure.
Period: Effective from 2026-07-01 · Updated: Reviewed each cap period
Inspect this recordPublished tariff rate tables
The indicative regional unit rates and standing charges shown on individual tariff review pages.
Period: Current at the review date shown on each tariff page · Updated: Reviewed at least monthly; Octopus rates refreshed daily where a live feed exists
Inspect this recordSupplier data
Supplier scores, the weighting behind them, and the evidence attached to each supplier claim.
PowerGuardian supplier scores
The 0–100 overall score for each tracked supplier and the six weighted dimensions behind it.
Period: H1 2026 · Updated: Weekly refresh; editorial review each monitoring cycle
Inspect this recordSupplier score weighting
The fixed weights applied to each scoring dimension to produce the overall score.
Period: Methodology v1 · Updated: Changed only with a documented methodology version bump
Inspect this recordSupplier claim evidence
The dated source behind each individual supplier claim, such as a complaints ratio or a tariff figure.
Period: Recorded per claim as a measurement period · Updated: Reviewed at least monthly; each claim carries its own next-review date
Inspect this recordForecasts
PowerGuardian's own modelled price-cap outlook, its basis, and its accuracy limits.
PowerGuardian price-cap outlook
Our estimates of the price cap in future periods. The numbers are currently withheld because we cannot show the calculation behind them.
Period: Cap periods after the one Ofgem has already announced · Updated: An automated job rewrites the estimates once a week. That is a refresh, not a check by a person.
Inspect this recordForecast revision history
The dated record of every published forecast revision, kept so past estimates cannot be quietly overwritten.
Period: From the first logged revision to the current one · Updated: Appended whenever a forecast changes
Inspect this recordCalculator assumptions
The consumption, price and efficiency assumptions the calculators use when you do not supply your own.
Ofgem Typical Domestic Consumption Values
The standard medium-household gas and electricity consumption figures used as calculator defaults.
Period: Effective from 2026-07-01 · Updated: Reviewed when Ofgem republishes the values
Inspect this recordIllustrative fuel prices and heat pump efficiency
The shared UK-average pence-per-kWh prices and typical heat pump performance factor used across the tools.
Period: Reviewed 2026-06-01 · Updated: Monthly
Inspect this recordCalculator model assumptions
The physical and financial modelling constants behind the solar, battery, EV, heat pump and boiler calculators.
Period: Reviewed alongside each tool · Updated: Reviewed when a tool is updated
Inspect this recordRegional data
Distribution-region comparisons and the network areas they describe.
Regional price cap rates
Ofgem's capped electricity and gas unit rates and daily standing charges for each of the 14 Great Britain energy regions, Direct Debit and single-rate metering.
Period: 1 July to 30 September 2026 (in force) and 1 October to 31 December 2026 (announced) · Updated: Re-read from Ofgem's rates page by hand when Ofgem publishes a new cap period, roughly every three months
Inspect this recordResearch datasets
The datasets and data periods behind published research reports and their downloadable tables.
Research report datasets
The data periods, methodology versions and downloadable scoring tables behind published research reports.
Period: Stated per report as a data period · Updated: Per report, on republication
Inspect this recordFound something wrong?
If a figure looks incorrect or out of date, tell us and we will check it against the source. Corrections to published figures are logged publicly.