active customer — borrowed from another act; this instrument states no meaning of its own (39)

aggregation — borrowed from another act; this instrument states no meaning of its own (43)

ancillary service — borrowed from another act; this instrument states no meaning of its own (60)

balance responsible party — a market participant or its chosen representative responsible for its imbalances in the electricity market (14)

balancing — all actions and processes, in all timelines, through which transmission system operators ensure, in an ongoing manner, maintenance of the system frequency within a predefined stability range and compliance with the amount of reserves needed with respect to the required quality (10)

balancing capacity — a volume of capacity that a balancing service provider has agreed to hold and in respect to which the balancing service provider has agreed to submit bids for a corresponding volume of balancing energy to the transmission system operator for the duration of the contract (13)

balancing energy — energy used by transmission system operators to carry out balancing (11)

balancing service provider — a market participant providing either or both balancing energy and balancing capacity to transmission system operators (12)

bidding zone — the largest geographical area within which market participants are able to exchange energy without capacity allocation (65)

capacity allocation — the attribution of cross-zonal capacity (66)

capacity calculation region — the geographic area in which the coordinated capacity calculation is applied (21)

capacity mechanism — a temporary measure to ensure the achievement of the necessary level of resource adequacy by remunerating resources for their availability, excluding measures relating to ancillary services or congestion management (22)

central dispatching model — a scheduling and dispatching model where the generation schedules and consumption schedules as well as dispatching of power-generating facilities and demand facilities, in reference to dispatchable facilities, are determined by a transmission system operator within an integrated scheduling process (29)

congestion — a situation in which all requests from market participants to trade between network areas cannot be accommodated because they would significantly affect the physical flows on network elements which cannot accommodate those flows (4)

control area — a coherent part of the interconnected system, operated by a single system operator and shall include connected physical loads and/or generation units if any (67)

coordinated net transmission capacity — a capacity calculation method based on the principle of assessing and defining ex ante a maximum energy exchange between adjacent bidding zones (68)

countertrading — a cross-zonal exchange initiated by system operators between two bidding zones to relieve physical congestion (27)

critical network element — a network element either within a bidding zone or between bidding zones taken into account in the capacity calculation process, limiting the amount of power that can be exchanged (69)

cross-border flow — a physical flow of electricity on a transmission network of a Member State that results from the impact of the activity of producers, customers, or both, outside that Member State on its transmission network (3)

cross-zonal capacity — the capability of the interconnected system to accommodate energy transfer between bidding zones (70)

customer — borrowed from another act; this instrument states no meaning of its own (34)

delegated operator — an entity to whom specific tasks or obligations entrusted to a transmission system operator or nominated electricity market operator under this Regulation or other Union legal acts have been delegated by that transmission system operator or NEMO or have been assigned by a Member State or regulatory authority (33)

demand response — borrowed from another act; this instrument states no meaning of its own (44)

demonstration project — a project which demonstrates a technology as a first of its kind in the Union and represents a significant innovation that goes well beyond the state of the art (24)

distributed generation — borrowed from another act; this instrument states no meaning of its own (51)

distribution — borrowed from another act; this instrument states no meaning of its own (47)

distribution system operator — borrowed from another act; this instrument states no meaning of its own (48)

electricity markets — borrowed from another act; this instrument states no meaning of its own (40)

electricity supply contract — borrowed from another act; this instrument states no meaning of its own (42)

energy efficiency — borrowed from another act; this instrument states no meaning of its own (49)

energy from renewable sources — borrowed from another act; this instrument states no meaning of its own (50)

energy storage — borrowed from another act; this instrument states no meaning of its own (62)

final customer — borrowed from another act; this instrument states no meaning of its own (35)

generation — borrowed from another act; this instrument states no meaning of its own (55)

generation unit — a single electricity generator belonging to a production unit (71)

high-efficiency cogeneration — cogeneration which meets the criteria laid down in Annex II to Directive 2012/27/EU of the European Parliament and of the Council Directive 2012/27/EU of the European Parliament and of the Council of 25 October 2012 on energy efficiency, amending Directives 2009/125/EC and 2010/30/EU and repealing Directives 2004/8/EC and 2006/32/EC (OJ L 315, 14.11.2012, p. 1). (23)

household customer — borrowed from another act; this instrument states no meaning of its own (37)

imbalance price — the price, be it positive, zero or negative, in each imbalance settlement period for an imbalance in each direction (16)

imbalance price area — the area in which an imbalance price is calculated (17)

imbalance settlement period — the time unit for which the imbalance of the balance responsible parties is calculated (15)

interconnected system — borrowed from another act; this instrument states no meaning of its own (57)

interconnector — a transmission line which crosses or spans a border between Member States and which connects the national transmission systems of the Member States (1)

interoperability — borrowed from another act; this instrument states no meaning of its own (46)

market operator — an entity that provides a service whereby the offers to sell electricity are matched with bids to buy electricity (7)

market participant — a natural or legal person who buys, sells or generates electricity, who is engaged in aggregation or who is an operator of demand response or energy storage services, including through the placing of orders to trade, in one or more electricity markets, including in balancing energy markets (25)

NEMO — a market operator designated by the competent authority to carry out tasks related to single day-ahead or single intraday coupling (8)

new interconnector — an interconnector not completed by 4 August 2003 (5)

non-frequency ancillary service — borrowed from another act; this instrument states no meaning of its own (61)

power-generating facility — a facility that converts primary energy into electrical energy and which consists of one or more power-generating modules connected to a network (28)

prequalification process — the process to verify the compliance of a provider of balancing capacity with the requirements set by the transmission system operators (18)

priority dispatch — with regard to the self-dispatch model, the dispatch of power plants on the basis of criteria which are different from the economic order of bids and, with regard to the central dispatch model, the dispatch of power plants on the basis of criteria which are different from the economic order of bids and from network constraints, giving priority to the dispatch of particular generation technologies (20)

producer — borrowed from another act; this instrument states no meaning of its own (56)

redispatching — a measure, including curtailment, that is activated by one or more transmission system operators or distribution system operators by altering the generation, load pattern, or both, in order to change physical flows in the electricity system and relieve a physical congestion or otherwise ensure system security (26)

regional coordination centre — regional coordination centre established pursuant to Article 35 of this Regulation (63)

regulatory authority — a regulatory authority designated by each Member State pursuant to Article 57(1) of Directive (EU) 2019/944 (2)

renewable energy — energy from renewable sources as defined in point (31) of Article 2 of Directive (EU) 2019/944 (50)

reserve capacity — the amount of frequency containment reserves, frequency restoration reserves or replacement reserves that needs to be available to the transmission system operator (19)

self-dispatch model — a scheduling and dispatching model where the generation schedules and consumption schedules as well as dispatching of power-generating facilities and demand facilities are determined by the scheduling agents of those facilities (30)

small connected system — borrowed from another act; this instrument states no meaning of its own (59)

small enterprise — borrowed from another act; this instrument states no meaning of its own (38)

small isolated system — borrowed from another act; this instrument states no meaning of its own (58)

smart metering system — borrowed from another act; this instrument states no meaning of its own (45)

specific balancing product — a balancing product different from a standard balancing product (32)

standard balancing product — a harmonised balancing product defined by all transmission system operators for the exchange of balancing services (31)

structural congestion — congestion in the transmission system that is capable of being unambiguously defined, is predictable, is geographically stable over time, and frequently reoccurs under normal electricity system conditions (6)

supply — borrowed from another act; this instrument states no meaning of its own (41)

system user — borrowed from another act; this instrument states no meaning of its own (54)

transmission — borrowed from another act; this instrument states no meaning of its own (52)

transmission system operator — borrowed from another act; this instrument states no meaning of its own (53)

value of lost load — an estimation in euro/MWh, of the maximum electricity price that customers are willing to pay to avoid an outage (9)

wholesale customer — borrowed from another act; this instrument states no meaning of its own (36)

wholesale energy market — wholesale energy market as defined in point (6) of Article 2 of Regulation (EU) No 1227/2011 of the European Parliament and of the Council Regulation (EU) No 1227/2011 of the European Parliament and of the Council of 25 October 2011 on wholesale energy market integrity and transparency (OJ L 326, 8.12.2011, p. 1). (64)