|European Union Electricity Market Glossary|
‘(N-1) criterion’ is the rule according to which the elements remaining in operation within a Transmission System Operator's (TSO's) control area after occurrence of a contingency are capable of accommodating the new operational situation without violating operational security limits (Article 3(2)(14) of the Network Code on System Operation).
Network Code on System Operation provides for the rule that if after a contingency the transmission system is not compliant with the (N-1)-Criterion, the TSO must initiate remedial actions to recover compliance with the (N-1) Criterion as soon as reasonably practicable.
The (N-1)-Criterion is a long established and proven operational standard, which is common amongst TSOs (ENTSO-E NC OS Supporting Paper, p. 33).
Network Code on System Operation, Article 3(2)(14), Article 35
|Last Updated on Tuesday, 19 September 2017 21:20|