5. Calculation of the N – 1 formula at regional level

The calculated area referred to in point 3 shall be extended to the appropriate regional level, where applicable, as determined by the competent authorities of the Member States concerned. The calculation may also extend to the regional level of the risk group, if so agreed with the competent authorities of the risk group. For the calculation of the N – 1 formula at regional level, the single largest gas infrastructure of common interest shall be used. The single largest gas infrastructure of common interest to a region shall be the largest gas infrastructure in the region that directly or indirectly contributes to gas supply to the Member States of that region and shall be defined in the risk assessment. The calculation of the N – 1 formula at regional level may replace the calculation of the N – 1 formula at national level only where the single largest gas infrastructure of common interest is of major importance for the gas supply of all Member States concerned in accordance with the common risk assessment. On the level of the risk group, for the calculations referred to in Article 7(4), the single largest gas infrastructure of common interest to the risk groups as listed in Annex I shall be used.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-01 · Text as adopted (Official Journal); later amendments are not incorporated in this text.