What may not exceed during the net scheduled transfer between two Balancing Authority areas?

The correct choice focuses on the fundamental principles of reliable electric system operation, particularly regarding the management of energy transfers between Balancing Authority areas. During a net scheduled transfer, it is essential that certain reliability and physical constraints are adhered to, specifically those related to thermal stability and transmission capability.

When transferring electrical energy across interconnections between different Balancing Authority areas, the thermal stability capacity limits of transmission lines must not be exceeded. This limitation ensures that the transmission lines do not overheat and potentially fail due to excessive current flow, which can create a risk of outages or damage to infrastructure.

In addition to thermal limits, the total transfer capability of any used transmission facility also plays a critical role in regulating the amount of power that can be reliably and safely moved from one area to another. This capability is determined by various factors, including infrastructure design, environmental conditions, and system operation.

Thus, neither the thermal limits of transmission lines nor the total transfer capability can be exceeded during net scheduled transfers. Both these constraints are essential to maintaining system reliability and preventing outages. Therefore, recognizing the interplay between these two factors is vital for ensuring that energy transfers remain within safe operational parameters.