Which AGC mode should a BA operating asynchronously switch to?

The appropriate mode for a Balancing Authority (BA) operating asynchronously to switch to is Flat Frequency mode. This mode is specifically designed to maintain system frequency at a stable point without making adjustments based on system changes or fluctuations. In scenarios where BAs operate asynchronously, it is crucial to keep the frequency consistent to ensure that the system remains stable and does not experience unnecessary variances that could lead to reliability issues.

Flat Frequency mode allows the Balancing Authority to focus on maintaining a steady frequency rather than constantly adjusting to real-time changes that occur in generation or load. This stability is particularly important when operating asynchronously, as it helps to mitigate the risk of frequency disturbances that can arise from the lack of synchronous operation with neighboring systems. By adopting Flat Frequency mode, the BA can effectively manage balance and reliability in their operations.