Where must Reliability Coordinators keep their Restoration Plans and those of their Transmission Operators?

The correct answer is that Reliability Coordinators must keep their Restoration Plans and those of their Transmission Operators in the Primary Control Room. This ensures that the most critical and immediate operational documents are readily accessible during emergency situations. The Primary Control Room is the main hub for operations and decision-making during events that affect the reliability of the grid.

By storing the Restoration Plans in this location, operators can quickly refer to them when needed, facilitating a more efficient response to restore service after outages or disruptions. The immediacy of having these plans in the Primary Control Room is vital, as it directly supports safe and effective management of the physical grid.

Other locations, such as the Main Office, Backup Control Room, or Field Office, may not provide the same level of accessibility or immediacy necessary for operational response. In the event of a grid disturbance, Restoration Plans must be easily available in the primary operational center rather than in secondary locations that might delay response efforts or complicate coordination with Transmission Operators.