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1. For the purpose of this Regulation, the following definitions apply:

(1) ‘regulatory asset base’ means the network assets of a transmission system operator, distribution system operator, hydrogen transmission network operator and hydrogen distribution network operator used for the provision of regulated network services that are taken into account when calculating network-related service revenue (2) ‘transmission’ means transmission as defined in Article 2, point (17), of Directive (EU) 2024/1788 (3) ‘transport contract’ means a contract which the transmission system operator or hydrogen network operator has concluded with a network user with a view to carrying out transport services for natural gas or hydrogen (4) ‘capacity’ means the maximum flow, expressed in normal cubic meters per time unit or in energy unit per time unit, to which the network user is entitled in accordance with the provisions of the transport contract (5) ‘unused capacity’ means firm capacity which a network user has acquired under a transport contract but which that user has not nominated by the deadline specified in the contract

(6) ‘congestion management’ means management of the capacity portfolio of the transmission system operator with a view to optimal and maximum use of the technical capacity and the timely detection of future congestion and saturation points (7) ‘secondary market’ means the market of the capacity traded otherwise than on the primary market (8) ‘nomination’ means the reporting by the network user to the transmission system operator of the actual flow that the network user wishes to inject into or withdraw from the system, prior to such an injection or withdrawal (9) ‘re-nomination’ means the reporting of a corrected nomination, subsequent to a nomination (10) ‘system integrity’ means any situation in which the pressure and the quality of the natural gas natural gas or hydrogen remain within the minimum and maximum limits, so that the transport of natural gas or hydrogen is guaranteed from a technical standpoint

(11) ‘balancing period’ means the period within which the off-take of an amount of natural gas or hydrogen, expressed in units of energy, is to be offset by every network user by means of the injection of the same amount of natural gas or hydrogen in accordance with the network code (12) ‘network user’ means network user as defined in Article 2, point (60), of Directive (EU) 2024/1788 (13) ‘interruptible services’ means services offered by the transmission system operator or, where applicable, the distribution system operator, or the hydrogen network operator in relation to interruptible capacity (14) ‘interruptible capacity’ means natural gas or hydrogen transmission capacity that may be interrupted by the transmission system operator or, where applicable, the distribution system operator, or the hydrogen network operator, in accordance with the conditions stipulated in the transport contract (15) ‘long-term services’ means services offered by the transmission system operator or, where applicable, the distribution system operator, or the hydrogen network operator with a duration of one year or more

(16) ‘short-term services’ means services offered by the transmission system operator or, where applicable, the distribution system operator, or the or hydrogen network operator with a duration of less than one year (17) ‘firm capacity’ means natural gas and hydrogen transmission and distribution capacity contractually guaranteed as uninterruptible by the transmission system operator or, where applicable, the distribution system operator, or the hydrogen network operator (18) ‘firm services’ mean services offered by the transmission system operator or, where applicable, the distribution system operator, or the hydrogen network operator in relation to firm capacity (19) ‘technical capacity’ means the maximum firm capacity that can be offered to the network users, taking account of system integrity and the operational requirements of the transmission system operator or, where applicable, the distribution system operator, or the hydrogen network operator (20) ‘contracted capacity’ means capacity that has been allocated to a network user by means of a transport contract

(21) ‘available capacity’ means the part of the technical capacity that is not allocated and that is still available to the system at a particular moment (22) ‘contractual congestion’ means a situation where the level of firm capacity demand exceeds the technical capacity (23) ‘primary market’ means the market of the capacity traded directly by the transmission system operator or, where applicable, the distribution system operator, or the hydrogen transmission network operator (24) ‘physical congestion’ means a situation where the level of demand for actual deliveries exceeds the technical capacity at a particular moment (25) ‘LNG facility capacity’ means capacity at an LNG terminal for the liquefaction of natural gas or the importation, offloading, ancillary services, temporary storage and re-gasification of LNG (26) ‘space’ means the volume of natural gas or hydrogen which a user of a storage facility is entitled to use for the storage of natural gas or hydrogen (27) ‘deliverability’ means the rate at which the storage facility user is entitled to withdraw natural gas or hydrogen from the natural gas storage facility or hydrogen storage facility

(28) ‘injectability’ means the rate at which the storage facility user is entitled to inject natural gas or hydrogen into the natural gas storage facility or hydrogen storage facility (29) ‘storage capacity’ means any combination of space, injectability and deliverability (30) ‘entry-exit system’ means entry-exit system as defined in Article 2, point (57), of Directive (EU) 2024/1788 (31) ‘balancing zone’ means balancing zone as defined in Article 2, point (58), of Directive (EU) 2024/1788 (32) ‘virtual trading point’ means virtual trading point as defined in Article 2, point (59), of Directive (EU) 2024/1788 (33) ‘entry point’ means entry point as defined in Article 2, point (61), of Directive (EU) 2024/1788 (34) ‘exit point’ means exit point as defined in Article 2, point (62), of Directive (EU) 2024/1788 (35) ‘conditional capacity’ means firm capacity that entails transparent and predefined conditions for either providing access from and to the virtual trading point or limited allocability (36) ‘allocability’ means the discretionary combination of any entry capacity with any exit capacity or vice versa

(37) ‘allowed revenue’ means the sum of transmission service revenue and non-transmission service revenue for the provision of services by the transmission system operator for a specific time period within a given regulatory period which such transmission system operator is entitled to obtain under a non-price cap regime and which is set in accordance with Article 78(7), point (a), of Directive (EU) 2024/1788 (38) ‘target revenue’ means the sum of expected transmission service revenue calculated in accordance with the principles set out in Article 17(1) and expected non-transmission service revenue for the provision of services by the transmission system operator for a specific time period within a given regulatory period under a price cap regime (39) ‘new infrastructure’ means an infrastructure not completed by 4 August 2003 (40) ‘natural gas’ means natural gas as defined in Article 2, point (1), of Directive (EU) 2024/1788 (41) ‘renewable gas’ means renewable gas as defined in Article 2, point (2), of Directive (EU) 2024/1788 (42) ‘natural gas system’ means natural gas system as defined in Article 2, point (3), of Directive (EU) 2024/1788

(43) ‘hydrogen system’ means hydrogen system as defined in Article 2, point (4), of Directive (EU) 2024/1788 (44) ‘hydrogen storage facility’ means a hydrogen storage facility as defined in Article 2, point (5), of Directive (EU) 2024/1788 (45) ‘hydrogen storage operator’ means a hydrogen storage operator as defined in Article 2, point (6), of Directive (EU) 2024/1788 (46) ‘hydrogen terminal’ means hydrogen terminal as defined in Article 2, point (8), of Gas Directive (EU) 2024/1788 (47) ‘hydrogen terminal operator’ means hydrogen terminal operator as defined in Article 2, point (9), of Directive (EU) 2024/1788 (48) ‘hydrogen quality’ means hydrogen quality as defined in Article 2, point (10), of Directive (EU) 2024/1788 (49) ‘low-carbon hydrogen’ means low-carbon hydrogen as defined in Article 2, point (11), of Directive (EU) 2024/1788 (50) ‘low-carbon gas’ means low-carbon gas as defined in Article 2, point (12), of Directive (EU) 2024/1788 (51) ‘transmission system operator’ means transmission system operator as defined in Article 2, point (18), of Directive (EU) 2024/1788

(52) ‘upstream pipeline network’ means upstream pipeline network as defined in Article 2, point (16), of Directive (EU) 2024/1788 (53) ‘distribution’ means distribution as defined in Article 2, point (19), of Directive (EU) 2024/1788 (54) ‘distribution system operator’ means distribution system operator as defined in Article 2, point (20), of Directive (EU) 2024/1788 (55) ‘hydrogen network’ means hydrogen network as defined in Article 2, point (21), of Directive (EU) 2024/1788 (56) ‘hydrogen transport’ means hydrogen transport as defined in Article 2, point (22), of Directive (EU) 2024/1788 (57) ‘hydrogen transmission network’ means hydrogen transmission network as defined in Article 2, point (23), of Directive (EU) 2024/1788 (58) ‘hydrogen distribution network’ means hydrogen distribution network as defined in Article 2, point (24), of Directive (EU) 2024/1788 (59) ‘hydrogen network operator’ means hydrogen network operator as defined in Article 2, point (25), of Directive (EU) 2024/1788 (60) ‘hydrogen transmission network operator’ means hydrogen transmission network operator as defined in Article 2, point (26), of Directive (EU) 2024/1788

(61) ‘hydrogen distribution network operator’ means hydrogen distribution network operator as defined in Article 2, point (27), of Directive (EU) 2024/1788 (62) ‘supply’ means supply as defined in Article 2, point (28), of Directive (EU) 2024/1788 (63) ‘natural gas storage facility’ means natural gas storage facility as defined in Article 2, point (31), of Directive (EU) 2024/1788 (64) ‘natural gas storage system operator’ means natural gas storage system operator as defined in Article 2, point (32), of Directive (EU) 2024/1788 (65) ‘LNG facility’ means LNG facility as defined in Article 2, point (33), of Directive (EU) 2024/1788 (66) ‘LNG system operator’ means LNG system operator as defined in Article 2, point (34), of Directive (EU) 2024/1788 (67) ‘system’ means system as defined in Article 2, point (35), of Directive (EU) 2024/1788 (68) ‘ancillary services’ means ancillary services as defined in Article 2, point (36), of Directive (EU) 2024/1788 (69) ‘interconnector’ means interconnector as defined in Article 2, point (39), of Gas Directive (EU) 2024/1788