What time must Balancing Authority ABC stop using RSG power to avoid submitting a Request for Interchange?

The answer indicates that Balancing Authority ABC must cease using RSG (Reliability Support Generation) power at 0705 to prevent having to submit a Request for Interchange (RFI). This timing is critical because it aligns with the operational guidelines that define when a Balancing Authority should transition from relying on RSG power to other generation resources, ensuring that the operation remains within compliance limits and avoids unnecessary requests for interconnection with other Balancing Authorities.

In the context of system operations, RSG power is typically utilized during periods of unexpected generation shortfalls or higher demand. However, reliance on this resource can impact system reliability and coordination between Balancing Authorities. By stopping usage by 0705, it allows for a smooth transition to more stable and predictable generation sources before peak demand periods or the next scheduled interchange cycle.

In contrast, the other times presented (0605, 0805, and 0905) do not align with the operational procedures that emphasize proactive management of resources to maintain system balance and reliability. Stopping at those times could either occur too early, before the system truly needs to shift resources, or too late, potentially prompting unnecessary RFIs that can complicate scheduling and resource coordination.