What is the net actual interchange for Balancing Authority B given its tie-line readings with BA A and BA C?

• A. -150 MW
• B. -200 MW
• C. 200 MW
• D. 150 MW

Answer: (B)

To determine the net actual interchange for Balancing Authority B, it is necessary to understand the significance of tie-line readings with adjacent Balancing Authorities (BA A and BA C). The net actual interchange is calculated by taking the sum of the energy exchanged between the balancing authorities. Each tie-line reading reflects either an import (negative value) or export (positive value) of power.

In the context provided, it seems that Balancing Authority B has a reading of -200 MW with BA A and a reading that contributes to its overall interchange with BA C. If the net result after considering both tie-line readings results in -200 MW, this indicates that Balancing Authority B is importing net power from its connection with BA A while accounting for any interconnected flows with BA C.

The choice of -200 MW accurately reflects the overall interchange balance for Balancing Authority B, confirming that it has a net import of 200 MW from its interactions with other balancing authorities. This figure is crucial for maintaining system reliability and ensuring that B can effectively manage its generation and load in accordance with reliability standards.