What action should Reliability Coordinator A take if they anticipate an overload of a transmission line interconnecting with Reliability Coordinator B?

Selecting the action of immediately contacting Reliability Coordinator B to discuss options is critical in maintaining the reliability of the grid. Communication between Reliability Coordinators is essential in the event of potential overloads, as it allows for a collaborative approach to addressing issues that may arise from interconnected systems.

By reaching out to Reliability Coordinator B, they can share real-time data, discuss the severity of the anticipated overload, and explore possible solutions together. This could include adjusting power flows, coordinating load management, or other remedial actions necessary to prevent the overload from affecting system reliability.

In scenarios involving interconnected systems, proactive communication helps ensure that both entities work in unison to manage resources effectively and prevent cascading failures. The other options, while possibly relevant in different contexts, do not address the immediate need for coordination and cooperative problem-solving in a timely manner, which is crucial in reliability management.