PJM mandates that generators greater than what capacity must adhere to a voltage schedule?

The correct threshold for generators that must adhere to a voltage schedule is set at a capacity of 20 MVA. This standard is in place to ensure that larger generating units contribute appropriately to the management of the electrical grid's voltage levels, thereby enhancing reliability and stability. Generators exceeding this threshold have a significant impact on the overall power system dynamics, and managing their voltage output is essential to maintaining system integrity.

PJM’s requirement for generators above this capacity to follow a voltage schedule is designed to help mitigate issues related to voltage fluctuations that can arise from the operation of large generation sources, thereby fostering smoother voltage profiles across the grid. It ensures that those generators can effectively respond to voltage changes and help maintain the desired voltage levels, which is crucial for both operational efficiency and safety.