SAP stands for STANDARD ASSESSMENT PROCEDURE. The UK government introduced SAP to measure the carbon impact on the environment and to rate the energy efficiency of a property. Since the introduction of SAP in 1995, there has been a number of revisions.
Revisions to the SAP criteria have taken into account advances in technology. The current SAP edition 2012 is used as part of building regulations for new dwellings in England and Wales.
You may be more familiar with Energy Performance Certificates that you get when you sell a property. These are produced by guidelines set out in SAP 2012. SAP 2012 currently don’t score electric very highly. The carbon factor used says for every kWh hour of electricity 0.519kg of CO2 is produced. This is inaccurate because it doesn’t take into account changes in our electricity grid. These inaccurate figures make an update to the SAP calculations long overdue.