3.

The annual reports referred to in paragraph 1 shall contain at least the following operational security indicators relevant to operational security: 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.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-04 · Text as adopted (Official Journal); later amendments are not incorporated in this text.