What action should Balancing Authority ABC take if a Transmission Loading Relief procedure reduces their scheduled interchange?

The appropriate action for Balancing Authority ABC to take when a Transmission Loading Relief procedure reduces their scheduled interchange is to comply with the request. This compliance is critical for maintaining the reliability and stability of the power grid.

When transmission constraints occur, it's vital for Balancing Authorities to follow Transmission Loading Relief procedures to prevent potential overloads and to ensure the safe and efficient operation of the transmission system. By complying, they contribute to reducing the risk of system failures or outages that could result from excessive transmission loading.

Balancing Authorities are responsible for maintaining the balance between electricity supply and demand within their areas, while also ensuring that they cooperate with neighboring authorities and adhere to regional reliability standards set forth by NERC. Therefore, compliance with Transmission Loading Relief instructions is not only a matter of regulatory obligation but also a key aspect of effective grid management.

In this context, the other options would not align with the responsibilities of a Balancing Authority: filing a complaint may not address the immediate issue of reliability, ignoring the request could lead to safety hazards and operational inefficiencies, and increasing generation output may exacerbate the transmission issues. Hence, compliance is the necessary and appropriate response.