As a transmission grid system operator you are expected to make assessments and to comprehend the status and analog data for which electrical calculations are essential. While our SCADA and EMS applications provide most of the data, it is important to understand how basic electrical quantities are derived. Given that conditions vary, it is important to grasp the implications of differing data sets and contingencies. For instance, a trainee will be expected to identify how ACE impacts a controlled response given AGC generation and BA interconnectivity, and how high voltage and reactive control may affect system reliability. The trainee must be able to list the components that generate negative and positive reactive power, master best choice responses to various conditional situations, and demonstrate how to respond to overloaded systems.