Transmission
for sustainability

The glossary below comprises terms related to the Best Paths project. A more comprehensive glossary has been developed by the ETSO-E and can be accessed here. 

A

Alternating Current (AC)

An electric current that reverses its direction at regular intervals.

C

Connecting DSO

Connecting DSO means the DSO to whose Network a Power Generating Module, Demand Facility, non-TSO owned Interconnector, or grid element is connected;

Connecting TSO

The TSO which operates the Responsibility Area in which Balancing Service Providers and Balance Responsible Parties shall be compliant with the terms and conditions related to Balancing.

Connection Transmission System Operator

Connection Transmission System Operator means the single Transmission System Operator which operates the Relevant Area in which a Balancing Service Provider or Balance Responsible Party shall be compliant with the terms and conditions regarding Balancing.

Current

Unless stated otherwise, Current refers to the root–mean–square value of the phase Current, expressed in amps (A) or multiples thereof.

D

Direct Current (DC)

Direct current or DC electricity is the continuous movement of electrons from an area of negative (-) charges to an area of positive (+) charges through a conducting material.

Distribution System Operator (DSO)

A natural or legal person responsible for operating, ensuring the maintenance of and, if necessary, developing the distribution Network in a given area and, where applicable, its interconnections with other Networks and for ensuring the long–term ability of the Network to meet reasonable demands for the distribution of electricity.

H

HVDC

High Voltage Direct Current

HVDC Converter Station

Part of an HVDC System which consists of one or more HVDC Converter Units installed in a single location together with buildings, reactors, filters, reactive power devices, control, monitoring, protective, measuring and auxiliary equipment.

I

Interconnector

Interconnector means a transmission line which crosses or spans a border between Member States and which connects the national transmission systems of the Member States.

O

Offshore Grid Connection System

The complete interconnection between the Offshore Connection Point and the connection to the interconnected onshore system at the Onshore Grid Interconnection Point.

T

Transmission

Transmission means the transport of electricity on the extra high-voltage and high-voltage interconnected system with a view to its delivery to final customers or to distributors, but does not include supply.

Transmission Line

A system of structures, wires, insulators and associated hardware that carry electric energy from one point to another in an electric power system. Lines are operated at relatively high voltages varying from 69 kV up to 765 kV, and are capable of transmitting large quantities of electricity over long distances.

Transmission Network

An electrical Network for the transmission of electrical power from and to third party[s] connected to it, including Demand Facilities, Distribution Networks or other Transmission Networks. The extent of this Network is defined at the national level.

Transmission System Operator (TSO)

A natural or legal person responsible for operating, ensuring the maintenance of and, if necessary, developing the transmission system in a given area and, where applicable, its interconnections with other systems, and for ensuring the long–term ability of the system to meet reasonable demands for the transmission of electricity.

V

Voltage

Unless stated otherwise, Voltage refers to the root–mean–square value of the phase–to–phase voltage.