Keep three dates distinct
The publication date tells you when information was announced. The effective date tells you when it starts. The review date tells you when HAUSE last checked its record. A recently checked future tariff must still be shown as future for an earlier billing period.
Split a crossing period
If a price changes partway through a bill, do not multiply the whole bill’s kWh by the new price. Use actual metered quantities for the sub-periods where available. A supplier’s estimation or allocation method may otherwise be needed. The comparison tool flags a period outside a preset’s stated validity rather than silently blending prices.
Understand review expiry
An until-further-notice tariff can change after collection. The library uses review-by dates so an old observation is not presented as permanently current. The source remains available for inspection, but a stale or out-of-date record is blocked from a current comparison until it is rechecked or replaced with a documented user scenario.
Do not confuse freshness with verification
A source check confirms what was observed, not that a supplier has verified your account or approved a switch. The record’s customer class, geography and eligibility still matter. Preserve a copy or link to the exact offer you intend to use.
HAUSE Energy editorial team · reviewed 2026-10-26. Calculation and coverage limits are documented in the methodology.