bottom-up re-energisation strategymeans a strategy where part of the system of a TSO can be re-energised without the assistance from other TSOs;
defence service providermeans a legal entity with a legal or contractual obligation to provide a service contributing to one or several measures of the system defence plan;
frequency leadermeans the TSO appointed and responsible for managing the system frequency within a synchronised region or a synchronous area in order to restore system frequency back to the nominal frequency;
high priority significant grid usermeans the significant grid user for which special conditions apply for disconnection and re-energisation;
netted demandmeans the netted value of active power seen from a given point of the system, computed as (load — generation), generally expressed in kilowatts (kW) or megawatts (MW), at a given instant or averaged over any designated interval of time;
re-energisationmeans reconnecting generation and load to energise the parts of the system that have been disconnected;
restoration planmeans all technical and organisational measures necessary for the restoration of the system back to normal state;
restoration service providermeans a legal entity with a legal or contractual obligation to provide a service contributing to one or several measures of the restoration plan;
resynchronisationmeans synchronising and connecting again two synchronised regions at the resynchronisation point;
resynchronisation leadermeans the TSO appointed and responsible for the resynchronisation of two synchronised regions;
resynchronisation pointmeans the device used to connect two synchronised regions, usually a circuit breaker.
synchronised regionmeans the fraction of a synchronous area covered by interconnected TSOs with a common system frequency and which is not synchronised with the rest of the synchronous area;
top-down re-energisation strategymeans a strategy that requires the assistance of other TSOs to re-energise parts of the system of a TSO;