If available primary reserve capacity is less than the largest operating generator, what should PJM issue?

When available primary reserve capacity is found to be less than the largest operating generator within the PJM system, it indicates a significant risk to system reliability. In such circumstances, issuing a manual load dump warning is a proactive measure designed to alert operators and ensure that necessary steps are taken to maintain grid stability.

A manual load dump warning implies that in the event of a generator trip or unexpected further demand, there may not be enough reserve power to manage the situation effectively. This warning prompts operators to take urgent measures, such as load shedding, to protect the overall integrity of the transmission system.

In contrast, other options like a system-wide alert or a reactive management notice might address broader operational concerns or provide updates on system status but would not specifically signal the immediate need for actions related to primary reserves. A generation performance report, while valuable for monitoring generator operation over time, does not serve the immediate purpose of addressing a critical reserve shortfall. Thus, a manual load dump warning is the appropriate response in this scenario to safeguard grid reliability.