ancillary services — ancillary services as defined in point 14 of Article 2 of Directive 2009/73/EC (26)

Calculated area — a geographical area for which the N – 1 formula is calculated, as determined by the competent authority ANNEX II

competent authority — a national governmental authority or a national regulatory authority designated by a Member State to ensure the implementation of the measures provided for in this Regulation (7)

customer — customer as defined in point 24 of Article 2 of Directive 2009/73/EC (2)

D_(eff) — the part (in mcm/d) of D_(max) that in the case of a disruption of gas supply can be sufficiently and timely covered with market-based demand-side measures in accordance with point (c) of Article 9(1) and Article 5(2). 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… ANNEX II

D_(max) — the total daily gas demand (in mcm/d) of the calculated area during a day of exceptionally high gas demand occurring with a statistical probability of once in 20 years. ‘EP_(m)’: technical capacity of entry points (in mcm/d), other than production, LNG and storage facilities covered by P_(m), LNG_(m) and S_(m), means the sum of the technical capacity of all border entry points capable of supplying gas to the calculated area. ‘P_(m)’: maximal technical production capability (in mcm/d) means the sum of the maximal technical daily production capability of all gas production facilities which can be delivered to the entry points in the calculated area. ‘S_(m)’: maximal technical storage deliverability (in mcm/d) means the sum of the maximal technical daily withdrawal capacity of all storage facilities which can be delivered to the entry points of the calculated area, taking into account their respective physical characteristics. ‘LNG_(m)’: maximal technical LNG facility capacity (in mcm/d) means the sum of the maximal technical daily send-out capacities at all LNG facilities in the calculated area, taking into account critical elements like offloading, ancillary services, temporary… ANNEX II

distribution — distribution as defined in point 5 of Article 2 of Directive 2009/73/EC (13)

distribution system operator — distribution system operator as defined in point 6 of Article 2 of Directive 2009/73/EC (14)

emergency supply corridors — Union gas supply routes that help Member States to better mitigate the effects of potential disruption of supply or infrastructure (16)

essential social service — a service related to healthcare, essential social care, emergency, security, education or public administration (4)

firm capacity — firm capacity as defined in point 16 of Article 2 of Regulation (EC) No 715/2009 (19)

gas supply contract — gas supply contract as defined in point 34 of Article 2 of Directive 2009/73/EC (10)

household customer — household customer as defined in point 25 of Article 2 of Directive 2009/73/EC (3)

I_(m) — the technical capacity of the single largest gas infrastructure (in mcm/d) with the highest capacity to supply the calculated area. When several gas infrastructures are connected to a common upstream or downstream gas infrastructure and cannot be separately operated, they shall be considered as one single gas infrastructure. N1%EP_(m)P_(m)S_(m)LNG_(m)I_(m)D_(max)D_(eff)100, N – 1 ≥ 100 % ANNEX II

interconnector — interconnector as defined in point 17 of Article 2 of Directive 2009/73/EC (15)

interruptible capacity — interruptible capacity as defined in point 13 of Article 2 of Regulation (EC) No 715/2009 (20)

LNG facility — LNG facility as defined in point 11 of Article 2 of Directive 2009/73/EC (22)

LNG facility capacity — LNG facility capacity as defined in point 24 of Article 2 of Regulation (EC) No 715/2009 (21)

national regulatory authority — a national regulatory authority designated in accordance with Article 39(1) of Directive 2009/73/EC (8)

natural gas undertaking — natural gas undertaking as defined in point 1 of Article 2 of Directive 2009/73/EC (9)

protected customer — a household customer who is connected to a gas distribution network and, in addition, where the Member State concerned so decides, may also mean one or more of the following, provided that enterprises or services as referred to in points (a) and (b) do not, jointly, represent more than 20 % of the total annual final gas consumption in that Member State: a small or medium-sized enterprise, provided that it is connected to a gas distribution network; an essential social service, provided that it is connected to a gas distribution or transmission network; a district heating installation to the extent that it delivers heating to household customers, small or medium-sized enterprises, or essential social services, provided that such installation is not able to switch to other fuels than gas (5)

security — security as defined in point 32 of Article 2 of Directive 2009/73/EC (1)

solidarity protected customer — a household customer who is connected to a gas distribution network, and, in addition, may include one or both of the following: a district heating installation if it is a protected customer in the relevant Member State and only in so far as it delivers heating to households or essential social services other than educational and public administration services; an essential social service if it is a protected customer in the relevant Member State, other than educational and public administration services (6)

storage capacity — storage capacity as defined in point 28 of Article 2 of Regulation (EC) No 715/2009 (17)

storage facility — storage facility as defined in point 9 of Article 2 of Directive 2009/73/EC (23)

system — system as defined in point 13 of Article 2 of Directive 2009/73/EC (24)

system user — system user as defined in point 23 of Article 2 of Directive 2009/73/EC (25)

technical capacity — technical capacity as defined in point 18 of Article 2 of Regulation (EC) No 715/2009 (18)

the most affected Member State — a Member State where a contract party of a given contract has the most of its sales of gas or customers located 11.

transmission — transmission as defined in point 3 of Article 2 of Directive 2009/73/EC (11)

transmission system operator — transmission system operator as defined in point 4 of Article 2 of Directive 2009/73/EC (12)