How frequently must each Reliability Coordinator review its restoration plan?

The correct answer is that each Reliability Coordinator must review its restoration plan every 12 calendar months. This requirement ensures that the plan remains current and effective in the face of changing operational conditions, technological advancements, and lessons learned from past events. Regularly reviewing the restoration plan helps to incorporate any updates or changes in the infrastructure, procedures, or regulatory environment, thereby enhancing the ability to restore service efficiently during emergencies.

In the context of outage restoration and reliability of the electric grid, it's crucial that these plans are not only reviewed but also tested and updated as necessary. This annual requirement aids in maintaining preparedness and ensuring that all personnel are familiar with the most current procedures for restoring operations in case of a disruption.

The options suggesting reviews every 6, 13, or 18 months either do not align with regulatory requirements for a thorough annual review or do not meet the necessary frequency needed to ensure effectiveness in an emergency. Consistent yearly updates ensure that the restoration strategies are fully integrated into the operator’s workflow, promoting resilience in the face of potential grid disturbances.