Question to the Department for Energy Security & Net Zero:

To ask the Secretary of State for Energy Security and Net Zero, whether the electricity price assumptions in SAP and RdSAP will be updated to reflect the announced reduction in electricity bills.

Electricity price assumptions in the Standard Assessment Procedure (SAP) and Reduced Data SAP (RdSAP) are set when each methodology is published and are not updated between versions. This ensures consistency for Energy Performance Certificates and related regulations. Updating assumptions mid-cycle would require a full methodology review and could alter EPC ratings, affecting compliance and fuel poverty metrics.

The Department is maintaining stability ahead of planned 2026 reforms, when the Home Energy Model will replace SAP and EPC metrics will be reviewed. In the meantime, the “estimated yearly energy costs” shown on Energy Performance Certificates are periodically updated using the latest fuel price data, ensuring that indicative running cost information remains as current as possible for households.