When must personnel for interchange notifications be available?

The correct answer indicates that personnel responsible for interchange notifications must be available immediately at all times. This is critical in the context of the electric power sector, where interchange transmissions—transfers of power between entities or grids—require timely communication and coordination to ensure reliability and operational efficiency.

Immediate availability is essential because any delays in notifications can lead to significant risks, including imbalances in supply and demand, potential outages, and complications in market operations. The electric grid operates under stringent reliability standards, and timely notifications are vital to maintaining system stability and responding promptly to changing conditions.

In other options, suggesting availability only during business hours would not sufficiently meet the needs of a 24/7 operation that the electrical grid represents. Similarly, relying on weekly or monthly schedules for personnel availability would not allow for the rapid responses necessary during unexpected events or emergencies in the grid, when swift actions can prevent disruptions. Immediate availability ensures that personnel can respond to sudden changes or needs as they arise, which is fundamental for the integrity of power system operations.