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non-frequency ancillary service

as defined in Directive (EU) 2019/944 of the European Parliament and of the Council of 5 June…, Article 2, point (49) (Definitions)

(49) 

‘non-frequency ancillary service’ means a service used by a transmission system operator or distribution system operator for steady state voltage control, fast reactive current injections, inertia for local grid stability, short-circuit current, black start capability and island operation capability;

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