# Commission Regulation (EU) 2017/1485 of 2 August 2017 establishing a guideline on electricity transmission system operation (Text with EEA relevance), Article 66: Year-ahead individual grid models

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

1. Each TSO shall determine a year-ahead individual grid model for each of the scenarios developed pursuant to Article 65, using its best estimates of the variables defined in Article 65(1). ...
2. When defining its year-ahead individual grid model, each TSO shall:
(a) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(b) balance for each scenario the sum of:
(i)net exchanges on AC lines;
(ii)estimated power flows on HVDC systems;
(iii)load, including an estimation of losses; and
(iv)generation.
3. Each TSO shall include in its year-ahead individual grid models the aggregated power outputs for power generating facilities connected to distribution systems. Those aggregated power outputs shall:
(a) be consistent with the structural data provided in accordance with the requirements of Articles ... 43, 45 and 48;
(b) be consistent with the scenarios developed in accordance with Article 65; and
(c) distinguish the type of primary energy source.

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Source: https://www.legislation.gov.uk/eur/2017/1485/article/66 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-1485/article-66
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.