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Interconnection Reliability Operating Limit

A System Operating Limit that, if violated, could lead to instability or cascading outages.

Definition by NERC

Source: 1

A System Operating Limit that, if violated, could lead to instability, uncontrolled separation, or cascading outages that adversely impact the reliability of the Bulk Electric System

A similar term, Interconnection Reliability Operating Limit Tv, is defined as follows:

The maximum time that an Interconnection Reliability Operating Limit can be violated before the risk to the interconnection or other Reliability Coordinator Area(s) becomes greater than acceptable. Each Interconnection Reliability Operating Limit’s Tv shall be less than or equal to 30 minutes.

Last modified: 2025-06-20

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  1. NERC (2025). Glossary of Terms Used in NERC Reliability Standards. https://www.nerc.com/pa/Stand/Glossary%20of%20Terms/Glossary_of_Terms.pdf ↩