When a Reliability Coordinator (RC) curtails an interchange transaction for TLR purposes, who must they notify?

When a Reliability Coordinator (RC) curtails an interchange transaction for Transmission Loading Relief (TLR) purposes, it is essential for them to notify both the source and sink Balancing Authorities (BAs). This requirement ensures that all relevant parties are aware of the curtailment, which can impact both the supply of electricity from the source and the demand at the sink. Notifying both BAs facilitates coordinated actions to manage system reliability and helps prevent further operational issues or reliability breaches.

The source BA needs to be informed to halt the generation or adjust the transactions they had planned based on the original agreement. Simultaneously, the sink BA must be notified because they need to adjust their consumption or make alternative arrangements for receiving power. This dual notification process is a crucial part of maintaining reliability across the interconnected power grids.

In this context, while notifying the PSE serving the load or every BA on the contract path may seem relevant, the specific requirement is for the source and sink BAs. This focused communication is critical for effective management of the curtailed transactions and for maintaining overall system reliability during TLR events.