After identifying unplanned permanent system modifications, how long does the TOP have to update and submit the restoration plan to the RC?

The obligation of a Transmission Operating Provider (TOP) to update and submit the restoration plan to the Reliability Coordinator (RC) is guided by regulatory standards that ensure adequate preparation for mitigating unplanned events. The timeframe specified is critical as it ensures that the system modifications are promptly addressed in operational plans aimed at restoring normal operations following disturbances.

The requirement for a 90-day window after identifying unplanned permanent system modifications reflects the urgency and seriousness of maintaining reliability in the transmission system. This period allows the TOP to thoroughly evaluate the impacts of any changes, assess the need for modifications to restoration plans, and ensure that all stakeholders are kept informed and prepared. This timeframe balances the need for immediate action with the reality that thorough assessments and consultations may take some time to conduct properly.

While other options may suggest shorter or longer periods, 90 calendar days stands out because it is both a feasible time frame for comprehensive evaluation and a standard set within industry practices to promote reliability and safety. In this context, the selection of 90 calendar days is particularly significant to ensure coordinated efforts in line with the regulatory framework on operational preparedness.