Disturbances by Region
Reliability Performance Gap Index

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Each of NERC's eight regions varies greatly in geographical and "electrical" size. WECC, though it shows the most disturbances, is also NERC's largest region. NERC will be working to provide a multi-year view of this metric in the coming weeks, which will provide a better view of this data.

About this Metric

This index is designed to measure how far the system is from expected performance under contingencies (dynamic conditions).  The RPG is defined as number of disturbance events in Categories 2 through 5 for a given period.  It measures the change in system ability to cope with pre-studied contingencies and unforeseen disturbances.  Ultimately, RPG indicates the most important measure of reliability standard and enforcement program effectiveness:  the number of events declining toward zero.