# Commission Delegated Regulation (EU) 2019/331 of 19 December 2018 determining transitional Union-wide rules for harmonised free allocation of emission allowances pursuant to Article 10a of Directive 2003/87/EC of the European Parliament and of the Council (Text with EEA relevance), Division 2: Where several measurement instruments of different quality are contributing to measurement results, either of the following methods shall be used for splitting installation-level data on quantities of materials, fuels, measurable heat or electricity to sub-installations:

Extent: E+W+S+N.I.

(a)Determination of the split based on a determination method, such as sub-metering, estimate, correlation, used equally for each sub-installation. Where the sum of the sub-installation data is different from the data determined separately for the installation, a uniform ‘reconciliation factor’ shall be applied for uniform correction to meet the total figure of the installation as follows:
RecF = DInst /Σ DSI
(Equation 1)
where RecF is the reconciliation factor, DInst is the data value determined for the installation as a whole, and DSI are the data values for the different sub-installations. The data for each sub-installation are then corrected as follows:
DSI,corr = DSI × RecF
(Equation 2)
(b)If only one sub-installation's data are unknown or of lower quality than the data of other sub-installations, known sub-installation data may be subtracted from the total installation data. This method is preferred only for sub-installations which contribute smaller quantities to the installation's allocation.

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Source: https://www.legislation.gov.uk/eur/2019/331/annex/VII/division/3/division/3.2/division/2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2019-331/annex-VII/division-3/division-3.2/division-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.