Article 2 Definitions

For the purposes of this Regulation, the definitions in Article 2 of Directive 2012/27/EU of the European Parliament and of the Council^f1 F1(other than the definition of ‘transmission system operator’) , Article 2 of F2Regulation (EU) 2019/943 of the European Parliament and of the Council of 5 June 2019 on the internal market for electricity (recast) F3...,, F4... Article 2 of Commission Regulation (EU) 2016/631^f2, Article 2 of Commission Regulation (EU) No 543/2013^f3 and Article 2 of Directive 2009/72/EC F5(other than the definitions of ‘distributed generation’, ‘renewable energy sources’ and ‘transmission system operator’) shall apply.

In addition, the following definitions shall apply:

1. (1)

   ‘demand facility’ means a facility which consumes electrical energy and is connected at one or more connection points to the transmission or distribution system. A distribution system and/or auxiliary supplies of a power generating module do no constitute a demand facility;

2. (2)

   ‘transmission-connected demand facility’ means a demand facility which has a connection point to a transmission system;

3. (3)

   ‘transmission-connected distribution facility’ means a distribution system connection or the electrical plant and equipment used at the connection to the transmission system;

4. (4)

   ‘demand unit’ means an indivisible set of installations containing equipment which can be actively controlled by a demand facility owner or by a CDSO, either individually or commonly as part of demand aggregation through a third party;

5. (5)

   ‘closed distribution system’ means a distribution system classified pursuant to F6paragraph 12(2) of Schedule 2ZA to the Electricity Act 1989 as a closed distribution system by F7the regulatory authority, which distributes electricity within a geographically confined industrial, commercial or shared services site and does not supply household customers, without prejudice to incidental use by a small number of households located within the area served by the system and with employment or similar associations with the owner of the system;

6. (6)

   ‘main demand equipment’ means at least one of the following equipment: motors, transformers, high voltage equipment at the connection point and at the process production plant;

7. (7)

   ‘transmission-connected distribution system’ means a distribution system connected to a transmission system, including transmission-connected distribution facilities;

8. (8)

   ‘maximum import capability’ means the maximum continuous active power that a transmission-connected demand facility or a transmission-connected distribution facility can consume from the network at the connection point, as specified in the connection agreement or as agreed between the relevant system operator and the transmission-connected demand facility owner or transmission-connected distribution system operator respectively;

9. (9)

   ‘maximum export capability’ means the maximum continuous active power that a transmission-connected demand facility or a transmission-connected distribution facility, can feed into the network at the connection point, as specified in the connection agreement or as agreed between the relevant system operator and the transmission-connected demand facility owner or transmission-connected distribution system operator respectively;

10. (10)

    ‘low frequency demand disconnection’ means an action where demand is disconnected during a low frequency event in order to recover the balance between demand and generation and restore system frequency to acceptable limits;

11. (11)

    ‘low voltage demand disconnection’ means a restoration action where demand is disconnected during a low voltage event in order to recover voltage to acceptable limits;

12. (12)

    ‘on load tap changer’ means a device for changing the tap of a winding, suitable for operation while the transformer is energised or on load;

13. (13)

    ‘on load tap changer blocking’ means an action that blocks the on load tap changer during a low voltage event in order to stop transformers from further tapping and suppressing voltages in an area;

14. (14)

    ‘control room’ means a relevant system operator's operation centre;

15. (15)

    ‘block loading’ means the maximum step active power loading of reconnected demand during system restoration after black-out;

16. (16)

    ‘demand response active power control’ means demand within a demand facility or closed distribution system that is available for modulation by the relevant system operator or relevant TSO, which results in an active power modification;

17. (17)

    ‘demand response reactive power control’ means reactive power or reactive power compensation devices in a demand facility or closed distribution system that are available for modulation by the relevant system operator or relevant TSO;

18. (18)

    ‘demand response transmission constraint management’ means demand within a demand facility or closed distribution system that is available for modulation by the relevant system operator or relevant TSO to manage transmission constraints within the system;

19. (19)

    ‘demand aggregation’ means a set of demand facilities or closed distribution systems which can operate as a single facility or closed distribution system for the purposes of offering one or more demand response services;

20. (20)

    ‘demand response system frequency control’ means demand within a demand facility or closed distribution system that is available for reduction or increase in response to frequency fluctuations, made by an autonomous response from the demand facility or closed distribution system to diminish these fluctuations;

21. (21)

    ‘demand response very fast active power control’ means demand within a demand facility or closed distribution system that can be modulated very fast in response to a frequency deviation, which results in a very fast active power modification;

22. (22)

    ‘demand response unit document’ (DRUD) means a document, issued either by the demand facility owner or the CDSO to the relevant system operator for demand units with demand response and connected at a voltage level above 1 000 V, which confirms the compliance of the demand unit with the technical requirements set out in this Regulation and provides the necessary data and statements, including a statement of compliance.