The ISO emphasizes that the 30-day rule is not intended to prevent needed maintenance on significant facilities in circumstances where the 30-day rule cannot be followed without adversely affecting the grid reliability. Accordingly, the following exceptions to the 30-day rule will be used to approve outages without classifying them as forced:
1. Outages that are less than 24 hours in duration.
2. Outages previously approved by ISO that are moved within the same calendar month either by the ISO or by request of the PTO.
3. ISO approved allowable transmission maintenance activities during restricted maintenance operations as covered in ISO operating procedure E-509A.
1. Outages that can be initiated and completed within a twenty-four hour period. .
3. ISO approved allowable transmission maintenance activities during restricted maintenance operations as covered in ISO operating procedure.
The ISO will review the history of exceptions annually to determine whether they are effective in promoting adequate information for CRR purposes, and whether use of these exceptions should continue to be classified as planned.