# Commission Regulation (EU) No 774/2010 of 2 September 2010 on laying down guidelines relating to inter-transmission system operator compensation and a common regulatory approach to transmission charging (Text with EEA relevance), Division 4.2: The amount of losses incurred on a national transmission system shall be established by calculating the difference between:

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

1.. the amount of losses actually incurred on the transmission system during the relevant period; and
2.. the estimated amount of losses on the transmission system which would have been incurred on the system during the relevant period if no transits of electricity had occurred.

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Source: https://www.legislation.gov.uk/eur/2010/774/annex/part/A/division/4/division/4.2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2010-774/annex/part-A/division-4/division-4.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.