4.

A transmission system shall be in the blackout state when at least one of the following conditions is fulfilled: loss of more than 50 % of demand in the concerned TSO's control area; total absence of voltage for at least three minutes in the concerned TSO's control area, leading to the triggering of restoration plans. A TSO of GB and IE/NI synchronous areas may develop a proposal specifying the level of demand loss at which the transmission system shall be in the blackout state. The TSOs of GB and IE/NI synchronous areas shall notify this instance to ENTSO for Electricity.

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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.