In the context of balancing responsibilities, what would 'tie line flow' refer to?

Tie line flow specifically refers to the movement of electricity across the boundary or interface between two different Balancing Authority areas. This flow is essential for maintaining the balance of supply and demand, as it represents the energy exchanged between these authorities. When one Balancing Authority can produce more energy than it consumes, it can send the excess power across its tie line to another Balancing Authority that may be experiencing a shortfall.

This exchange of energy helps in stabilizing the overall grid and ensuring that all Balancing Authorities can operate effectively while maintaining their respective load obligations. It is critical for operators to monitor and manage these flows to maintain system reliability and prevent overloads or outages.

The other choices do not represent the concept of tie line flow accurately. The output of a single generator refers to the amount of electricity generated by that specific generator, while the internal load of a Balancing Authority pertains to the electricity used within its own jurisdiction. Consumption of electricity in the interconnection involves the total demand in a broader interconnected grid but does not specifically describe the exchange aspect highlighted by tie line flow.