What should be the prime consideration of a system operator when an operating emergency occurs?

The primary consideration of a system operator during an operating emergency should be to maintain parallel operation throughout the interconnection. This focus is crucial because the reliability and stability of the entire power grid depend on the synchronization of various systems. Maintaining parallel operation helps to ensure that even in an emergency, power flow can be sustained and coordinated among generators and transmission lines, preventing cascading failures that could lead to widespread blackouts.

In an emergency, while calling for assistance or implementing load shedding might be necessary steps, the overarching goal should be to keep all parts of the grid functioning together as much as possible. This helps in quickly addressing any anomalous conditions while ensuring that there is no interruption in the service provided to consumers and recovering from the emergency without significant disruptions.

Separating from the interconnection can be a drastic measure typically reserved for severe scenarios where the integrity of the whole system is at stake. However, it would not be the first consideration in most operating emergencies, as it can further complicate the situation and could exacerbate issues rather than resolve them. Thus, prioritizing the maintenance of parallel operation aligns with the goals of enhancing system stability and reliability during critical moments.