Directive 2012/27/EU of the European Parliament and of the CouncilShow full title

1. Methods for calculating energy savings for the purposes of Article 7(1) and (2), and points (b), (c), (d), (e) and (f) of the second subparagraph of Article 7(9), and Article 20(6).

Obligated, participating or entrusted parties, or implementing public authorities may use one or more of the following methods for calculating energy savings:

(a)

deemed savings, by reference to the results of previous independently monitored energy improvements in similar installations. The generic approach is termed ‘ex-ante’;

(b)

metered savings, whereby the savings from the installation of a measure, or package of measures, is determined by recording the actual reduction in energy use, taking due account of factors such as additionality, occupancy, production levels and the weather which may affect consumption. The generic approach is termed ‘ex-post’;

(c)

scaled savings, whereby engineering estimates of savings are used. This approach may only be used where establishing robust measured data for a specific installation is difficult or disproportionately expensive, e.g. replacing a compressor or electric motor with a different kWh rating than that for which independent information on savings has been measured, or where they are carried out on the basis of nationally established methodologies and benchmarks by qualified or accredited experts that are independent of the obligated, participating or entrusted parties involved;

(d)

surveyed savings, where consumers’ response to advice, information campaigns, labelling or certification schemes, or smart metering is determined. This approach may only be used for savings resulting from changes in consumer behaviour. It may not be used for savings resulting from the installation of physical measures.