N-1 Criterion
European Union Electricity Market Glossary




(N-1)-Criterion means the rule according to which elements remaining in operation within TSO's Responsibility Area after a Contingency from the Contingency List must be capable of accommodating the new operational situation without violating Operational Security Limits.


Network Code on Operational Security provides for the rule that if after a Contingency the Transmission System is not compliant with the (N-1)-Criterion, the Transmission System Operator (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).



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Last Updated on Friday, 20 January 2017 23:06


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