Article 15 Annual report on operational security indicators

number of tripped transmission system elements per year per TSO;

number of tripped power generation facilities per year per TSO;

energy not supplied per year due to unscheduled disconnection of demand facilities per TSO;

time duration and number of instances of being in the alert and emergency states per TSO;

time duration and number of events within which there was a lack of reserves identified per TSO;

time duration and number of voltage deviations exceeding the ranges from Tables 1 and 2 of Annex II per TSO;

number of minutes outside the standard frequency range and number of minutes outside the 50 % of maximum steady state frequency deviation per synchronous area;

number of system-split separations or local blackout states; and

number of blackouts involving two or more TSOs.

number of events in which an incident contained in the contingency list led to a degradation of the system operation state;

number of the events referred to in point (a) in which a degradation of system operation conditions occurred as a result of unexpected discrepancies from load or generation forecasts;

number of events in which there was a degradation in system operation conditions due to an exceptional contingency;

number of the events referred to in point (c) in which a degradation of system operation conditions occurred as a result of unexpected discrepancies from load or generation forecasts; and

number of events leading to a degradation in system operation conditions due to lack of active power reserves.