Which Balancing Authority is responsible for implementing each Interchange Transaction as Tagged?

The Sink Balancing Authority (BA) is responsible for implementing each Interchange Transaction as tagged. In the context of power transactions, the Sink BA is the entity that receives electric power. When an Interchange Transaction is arranged, it includes a specific tag that outlines the details of the transaction, such as the source and sink BAs, the amount of power being transferred, and the timing of the transaction.

The Sink BA has the responsibility to ensure that the power they are set to receive aligns with the communicated and tagged details of the transaction. This means that they must adjust their operations according to the tagged interchange, confirming that they are prepared to take in the specified amount of power as per the arrangement.

In contrast, the Source BA is generally responsible for supplying the power, while the Control BA's role may involve overseeing and coordinating the overall operations, including reliability, but not necessarily executing the transaction as tagged. The concept of an Inventory BA isn't standard in this context, making the Sink BA the most appropriate choice for the responsibility described in the question.