# Regulation (EU) 2017/1938 of the European Parliament and of the Council of 25 October 2017 concerning measures to safeguard the security of gas supply and repealing Regulation (EU) No 994/2010 (Text with EEA relevance), Division 2: Infrastructure standard (Article 5)

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

Describe how the infrastructure standard is complied with, including the main values used for the N – 1 formula and alternative options for its compliance (with directly connected Member States, demand-side measures) and the existing bidirectional capacities, as follows:
(a)N – 1 formula
(i)the identification of the single largest gas infrastructure;
(ii)the calculation of the N – 1 formula for the United Kingdom;
(iii)a description of the values used for all elements in the N – 1 formula, including intermediate values used for their calculation (e.g. for EPm indicate the capacity of all entry points considered under this parameter);
(iv)an indication of the methodologies used, if any, for the calculation of parameters in the N – 1 formula (e.g. Dmax) (use annexes for detailed explanations);
(v)an explanation of the results of the calculation of the N – 1 formula considering the level of storages at 30 % and 100 % of the maximum working volume;
(vi)an explanation of the main results of the simulation of the N – 1 formula using a hydraulic model;
(vii)if so decided by the Secretary of State, a calculation of the N – 1 formula using demand-side measures:
calculation of the N – 1 formula in accordance with point 2 of Annex II,
description of the values used for all elements in the N – 1 formula, including intermediate figures used for the calculation (if different to the figures described under point 2(a)(iii)),
indicate the methodologies used, if any, for the calculation of parameters in the N – 1 formula (e.g. Dmax) (use annexes for detailed explanations),
explain the market-based demand-side measures adopted/to be adopted to compensate a disruption of gas supply and its expected impact (Deff);
(viii)...
(b)bi-directional capacity
(i)indicate the interconnection points equipped with bidirectional capacity and the maximal capacity of bi-directional flows;
(ii)indicate the arrangements governing the use of the reverse flow capacity (e.g. interruptible capacity);
(iii)indicate interconnection points where an exemption has been granted in accordance with Article 5(4), the duration of the exemption and the grounds on which it was granted.

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Source: https://www.legislation.gov.uk/eur/2017/1938/annex/V/division/2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-1938/annex-V/division-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.